test(app): add gtest coverage for previously untested app modules

Add 312 test cases across 14 new files under tests/gtest, covering:

- app/common utility headers (tooltypes, projecttypes, nodedatatypes,
  trackreferencehandle, undowrapper, configwrapper, subtitleapp, ...)
- all 8 standardcombos widgets
- slider base classes (NumericSliderBase, SliderLadder)
- timeline/track handles, marker handle/painting, drag button,
  elapsed counter
- timebased views, selection manager, time target, resizable timeline
  scrollbar
- viewer sizer, display buffer, playback timer, text editor
- timeline common helpers, TimelineAndTrackView, TrackView(-item/-splitter)
- project explorer views, navigation and undo commands
- node view items/edges/connectors/minimap/toolbar/context
- node param view sub-widgets
- about/export/sequence/footage-properties dialogs
- scope widgets (histogram/vectorscope/waveform), managed display
- main menu, main window undo commands, viewer/footage panels,
  engine event bridge
- keyframe view handle/input connection, multicam display,
  node combo box, audio monitor

Includes regression tests for the TimelineAndTrackView teardown and
TimeScaledObject inverted-limits fixes. Full suite: 2341 tests, 0 failures
(64 skips are pre-existing GL-dependent cases under the offscreen QPA).

tests/gtest/CMakeLists.txt

@@ -142,6 +142,20 @@ add_executable(olive-gtest
   mainwindow_test.cpp
   serialized_layout_xml_test.cpp
   common_ratiodialog_test.cpp
+  common_misc2_test.cpp
+  widget_standardcombos_test.cpp
+  widget_sliderbase_test.cpp
+  widget_handles_test.cpp
+  widget_timebased2_test.cpp
+  widget_viewer2_test.cpp
+  timeline_common_test.cpp
+  widget_projectexplorer2_test.cpp
+  widget_nodeview_test.cpp
+  widget_nodeparamview_test.cpp
+  dialog_misc2_test.cpp
+  widget_scope_test.cpp
+  mainwindow2_test.cpp
+  widget_keyframe_multicam_test.cpp
 )
 
 find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Test)

tests/gtest/common_misc2_test.cpp

@@ -0,0 +1,802 @@
+#include <gtest/gtest.h>
+
+#include <QBuffer>
+#include <QDataStream>
+#include <QSet>
+#include <QVariant>
+#include <QVector2D>
+#include <QVector3D>
+#include <QVector4D>
+
+#include "common/configwrapper.h"
+#include "common/debugapp.h"
+#include "common/nodedatatypes.h"
+#include "common/nodevaluehandle.h"
+#include "common/oakvaluehelper.h"
+#include "common/projecttypes.h"
+#include "common/subtitleapp.h"
+#include "common/tooltypes.h"
+#include "common/trackreferencehandle.h"
+#include "common/undowrapper.h"
+#include "oakengine/undo.h"
+#include "oakutil/qtutils.h"
+
+namespace
+{
+
+// OakConfigValue reads/writes go through the process-wide engine config, so
+// snapshot and restore each key the tests touch
+class ScopedConfigKey {
+public:
+	explicit ScopedConfigKey(const QString &key)
+		: key_(key)
+		, old_value_(oakengine_config_string(key))
+	{
+	}
+
+	~ScopedConfigKey()
+	{
+		oakengine_config_set_string(key_.toUtf8().constData(),
+									old_value_.toUtf8().constData());
+	}
+
+private:
+	static QString oakengine_config_string(const QString &key)
+	{
+		char buf[1024];
+		const int len = oakengine_config_get_string(key.toUtf8().constData(),
+													buf, sizeof(buf));
+		return QString::fromUtf8(buf, len);
+	}
+
+	QString key_;
+	QString old_value_;
+};
+
+// App-side undo command for wrap_app_undo_command(): counts invocations and
+// reports its own destruction so ownership transfer can be observed
+struct CountingCmd {
+	int *redo_count;
+	int *undo_count;
+	bool *destroyed;
+
+	void redo()
+	{
+		++*redo_count;
+	}
+	void undo()
+	{
+		++*undo_count;
+	}
+	~CountingCmd()
+	{
+		*destroyed = true;
+	}
+};
+
+} // namespace
+
+TEST(ToolTypes, AddableObjectNamesCoverAllValues)
+{
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_empty),
+			  QStringLiteral("Empty"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_bars),
+			  QStringLiteral("Bars"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_shape),
+			  QStringLiteral("Shape"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_solid),
+			  QStringLiteral("Solid"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_title),
+			  QStringLiteral("Title"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_tone),
+			  QStringLiteral("Tone"));
+	EXPECT_EQ(
+		olive::Tool::get_addable_object_name(olive::Tool::k_addable_subtitle),
+		QStringLiteral("Subtitle"));
+
+	// Out-of-range values fall through to "Unknown"
+	EXPECT_EQ(olive::Tool::get_addable_object_name(olive::Tool::k_addable_count),
+			  QStringLiteral("Unknown"));
+	EXPECT_EQ(olive::Tool::get_addable_object_name(
+				  static_cast<olive::Tool::AddableObject>(-1)),
+			  QStringLiteral("Unknown"));
+}
+
+TEST(ToolTypes, AddableObjectIdsCoverAllValues)
+{
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_empty),
+			  QStringLiteral("empty"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_bars),
+			  QStringLiteral("bars"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_shape),
+			  QStringLiteral("shape"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_solid),
+			  QStringLiteral("solid"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_title),
+			  QStringLiteral("title"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_tone),
+			  QStringLiteral("tone"));
+	EXPECT_EQ(olive::Tool::get_addable_object_id(olive::Tool::k_addable_subtitle),
+			  QStringLiteral("subtitle"));
+
+	// Every real addable has a unique non-empty id
+	QSet<QString> ids;
+	for (int i = 0; i < olive::Tool::k_addable_count; i++) {
+		const QString id = olive::Tool::get_addable_object_id(
+			static_cast<olive::Tool::AddableObject>(i));
+		EXPECT_FALSE(id.isEmpty());
+		EXPECT_FALSE(ids.contains(id)) << id.toStdString();
+		ids.insert(id);
+	}
+
+	// Out-of-range values return an empty id
+	EXPECT_TRUE(
+		olive::Tool::get_addable_object_id(olive::Tool::k_addable_count).isEmpty());
+	EXPECT_TRUE(olive::Tool::get_addable_object_id(
+					static_cast<olive::Tool::AddableObject>(-1)).isEmpty());
+}
+
+TEST(ToolTypes, ItemOrdinalsMatchEngineMirror)
+{
+	// The C ABI transports these as ints, so the ordinals are the contract
+	EXPECT_EQ(olive::Tool::k_none, 0);
+	EXPECT_EQ(olive::Tool::k_pointer, 1);
+	EXPECT_EQ(olive::Tool::k_track_select, 13);
+	EXPECT_EQ(olive::Tool::k_count, 14);
+	EXPECT_EQ(olive::Tool::k_addable_count, 7);
+}
+
+TEST(ProjectTypes, CacheSettingOrdinals)
+{
+	EXPECT_EQ(olive::Project::k_cache_use_default_location, 0);
+	EXPECT_EQ(olive::Project::k_cache_store_alongside_project, 1);
+	EXPECT_EQ(olive::Project::k_cache_custom_path, 2);
+}
+
+TEST(NodeDataTypes, OrdinalsMatchEngineMirror)
+{
+	EXPECT_EQ(olive::k_node_data_icon, 0);
+	EXPECT_EQ(olive::k_node_data_duration, 1);
+	EXPECT_EQ(olive::k_node_data_created_time, 2);
+	EXPECT_EQ(olive::k_node_data_modified_time, 3);
+	EXPECT_EQ(olive::k_node_data_frequency_rate, 4);
+	EXPECT_EQ(olive::k_node_data_tooltip, 5);
+}
+
+TEST(NodeValueHandle, TypeOrdinalsMatchEngineMirror)
+{
+	EXPECT_EQ(olive::NodeValueType::k_none, 0);
+	EXPECT_EQ(olive::NodeValueType::k_boolean, 4);
+	EXPECT_EQ(olive::NodeValueType::k_vec2, 12);
+	EXPECT_EQ(olive::NodeValueType::k_data_type_count, 23);
+}
+
+TEST(NodeValueHandle, KeyframeTypeOrdinalsMatchEngineMirror)
+{
+	EXPECT_EQ(olive::NodeKeyframeType::k_invalid, -1);
+	EXPECT_EQ(olive::NodeKeyframeType::k_linear, 0);
+	EXPECT_EQ(olive::NodeKeyframeType::k_hold, 1);
+	EXPECT_EQ(olive::NodeKeyframeType::k_bezier, 2);
+}
+
+TEST(NodeValueHandle, ToCMappingsDifferFromPlainCast)
+{
+	// The two enums do NOT share ordinals; the helper must remap each one
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_int),
+			  OAK_NODE_VALUE_INT);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_float),
+			  OAK_NODE_VALUE_FLOAT);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_boolean),
+			  OAK_NODE_VALUE_BOOL);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_rational),
+			  OAK_NODE_VALUE_RATIONAL);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_color),
+			  OAK_NODE_VALUE_COLOR);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_vec2),
+			  OAK_NODE_VALUE_VEC2);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_vec3),
+			  OAK_NODE_VALUE_VEC3);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_vec4),
+			  OAK_NODE_VALUE_VEC4);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_combo),
+			  OAK_NODE_VALUE_COMBO);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_file),
+			  OAK_NODE_VALUE_STRING);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_text),
+			  OAK_NODE_VALUE_TEXT);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_font),
+			  OAK_NODE_VALUE_FONT);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_str_combo),
+			  OAK_NODE_VALUE_STR_COMBO);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_binary),
+			  OAK_NODE_VALUE_BINARY);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_bezier),
+			  OAK_NODE_VALUE_BEZIER);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_texture),
+			  OAK_NODE_VALUE_TEXTURE);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_samples),
+			  OAK_NODE_VALUE_SAMPLES);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_video_params),
+			  OAK_NODE_VALUE_VIDEO_PARAMS);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_audio_params),
+			  OAK_NODE_VALUE_AUDIO_PARAMS);
+
+	// k_boolean=4 vs OAK_NODE_VALUE_BOOL=3: a plain cast would be wrong
+	EXPECT_NE(olive::NodeValueType::k_boolean, OAK_NODE_VALUE_BOOL);
+}
+
+TEST(NodeValueHandle, ToCReturnsMinusOneForUnrepresentable)
+{
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_none), -1);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_matrix), -1);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_subtitle_params),
+			  -1);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_push_button), -1);
+	EXPECT_EQ(olive::node_value_type_to_c(olive::NodeValueType::k_data_type_count),
+			  -1);
+	EXPECT_EQ(olive::node_value_type_to_c(-7), -1);
+}
+
+TEST(TrackReferenceHandle, DefaultIsInvalidNone)
+{
+	const olive::TrackReference ref;
+	EXPECT_EQ(ref.type(), olive::TrackReference::k_none);
+	EXPECT_EQ(ref.index(), -1);
+	EXPECT_FALSE(ref.is_valid());
+	EXPECT_TRUE(ref.to_string().isEmpty());
+}
+
+TEST(TrackReferenceHandle, ConstructionAndValidity)
+{
+	const olive::TrackReference video(olive::TrackReference::k_video, 3);
+	EXPECT_EQ(video.type(), olive::TrackReference::k_video);
+	EXPECT_EQ(video.index(), 3);
+	EXPECT_TRUE(video.is_valid());
+
+	// A known type with a negative index is not valid
+	EXPECT_FALSE(
+		olive::TrackReference(olive::TrackReference::k_video, -1).is_valid());
+	// k_none and k_count are never valid, even with a non-negative index
+	EXPECT_FALSE(olive::TrackReference(olive::TrackReference::k_none, 5).is_valid());
+	EXPECT_FALSE(
+		olive::TrackReference(olive::TrackReference::k_count, 0).is_valid());
+	// Index zero is a valid track
+	EXPECT_TRUE(
+		olive::TrackReference(olive::TrackReference::k_audio, 0).is_valid());
+}
+
+TEST(TrackReferenceHandle, ComparisonOperators)
+{
+	const olive::TrackReference a(olive::TrackReference::k_audio, 1);
+	const olive::TrackReference a2(olive::TrackReference::k_audio, 1);
+	const olive::TrackReference a3(olive::TrackReference::k_audio, 2);
+	const olive::TrackReference v0(olive::TrackReference::k_video, 0);
+
+	EXPECT_TRUE(a == a2);
+	EXPECT_FALSE(a != a2);
+	EXPECT_TRUE(a != a3);
+	EXPECT_TRUE(a != v0);
+
+	// Ordering is by type first (k_video=0 < k_audio=1), then index
+	EXPECT_TRUE(v0 < a);
+	EXPECT_FALSE(a < v0);
+	EXPECT_TRUE(a < a3);
+	EXPECT_FALSE(a3 < a);
+	EXPECT_FALSE(a < a2);
+}
+
+TEST(TrackReferenceHandle, TypeStringMappings)
+{
+	EXPECT_EQ(olive::TrackReference::type_to_string(olive::TrackReference::k_video),
+			  QStringLiteral("v"));
+	EXPECT_EQ(olive::TrackReference::type_to_string(olive::TrackReference::k_audio),
+			  QStringLiteral("a"));
+	EXPECT_EQ(
+		olive::TrackReference::type_to_string(olive::TrackReference::k_subtitle),
+		QStringLiteral("s"));
+	EXPECT_TRUE(
+		olive::TrackReference::type_to_string(olive::TrackReference::k_none)
+			.isEmpty());
+	EXPECT_TRUE(
+		olive::TrackReference::type_to_string(olive::TrackReference::k_count)
+			.isEmpty());
+
+	EXPECT_EQ(olive::TrackReference::type_to_translated_string(
+				  olive::TrackReference::k_video),
+			  QStringLiteral("V"));
+	EXPECT_EQ(olive::TrackReference::type_to_translated_string(
+				  olive::TrackReference::k_audio),
+			  QStringLiteral("A"));
+	EXPECT_EQ(olive::TrackReference::type_to_translated_string(
+				  olive::TrackReference::k_subtitle),
+			  QStringLiteral("S"));
+	EXPECT_TRUE(olive::TrackReference::type_to_translated_string(
+					olive::TrackReference::k_none).isEmpty());
+	EXPECT_TRUE(olive::TrackReference::type_to_translated_string(
+					olive::TrackReference::k_count).isEmpty());
+}
+
+TEST(TrackReferenceHandle, StringRoundTrip)
+{
+	const olive::TrackReference ref(olive::TrackReference::k_video, 12);
+	EXPECT_EQ(ref.to_string(), QStringLiteral("v:12"));
+
+	const olive::TrackReference parsed =
+		olive::TrackReference::from_string(QStringLiteral("v:12"));
+	EXPECT_EQ(parsed, ref);
+	EXPECT_TRUE(parsed.is_valid());
+
+	EXPECT_EQ(olive::TrackReference(olive::TrackReference::k_audio, 0).to_string(),
+			  QStringLiteral("a:0"));
+	EXPECT_EQ(
+		olive::TrackReference(olive::TrackReference::k_subtitle, 7).to_string(),
+		QStringLiteral("s:7"));
+
+	// An invalid reference serializes to an empty string
+	EXPECT_TRUE(olive::TrackReference().to_string().isEmpty());
+}
+
+TEST(TrackReferenceHandle, FromStringRejectsGarbage)
+{
+	// Bad prefixes and malformed input all parse back to the default ref
+	const olive::TrackReference fallback;
+	for (const QString &s : { QStringLiteral("x:1"), QStringLiteral("v"),
+							  QStringLiteral("v:"), QStringLiteral("v:abc"),
+							  QStringLiteral(""), QStringLiteral("a"),
+							  QStringLiteral("vv:1") }) {
+		EXPECT_EQ(olive::TrackReference::from_string(s), fallback)
+			<< s.toStdString();
+	}
+
+	EXPECT_EQ(olive::TrackReference::type_from_string(QStringLiteral("v:1")),
+			  olive::TrackReference::k_video);
+	EXPECT_EQ(olive::TrackReference::type_from_string(QStringLiteral("a:2")),
+			  olive::TrackReference::k_audio);
+	EXPECT_EQ(olive::TrackReference::type_from_string(QStringLiteral("s:3")),
+			  olive::TrackReference::k_subtitle);
+	EXPECT_EQ(olive::TrackReference::type_from_string(QStringLiteral("q:3")),
+			  olive::TrackReference::k_none);
+}
+
+TEST(TrackReferenceHandle, HashAndSetSemantics)
+{
+	QSet<olive::TrackReference> set;
+	set.insert(olive::TrackReference(olive::TrackReference::k_video, 0));
+	set.insert(olive::TrackReference(olive::TrackReference::k_video, 0));
+	set.insert(olive::TrackReference(olive::TrackReference::k_audio, 0));
+
+	EXPECT_EQ(set.size(), 2);
+	EXPECT_TRUE(
+		set.contains(olive::TrackReference(olive::TrackReference::k_video, 0)));
+	EXPECT_TRUE(
+		set.contains(olive::TrackReference(olive::TrackReference::k_audio, 0)));
+	EXPECT_FALSE(
+		set.contains(olive::TrackReference(olive::TrackReference::k_video, 1)));
+
+	// Equal references hash equally
+	EXPECT_EQ(qHash(olive::TrackReference(olive::TrackReference::k_subtitle, 2)),
+			  qHash(olive::TrackReference(olive::TrackReference::k_subtitle, 2)));
+}
+
+TEST(TrackReferenceHandle, DataStreamRoundTrip)
+{
+	QByteArray bytes;
+	{
+		QBuffer buffer(&bytes);
+		ASSERT_TRUE(buffer.open(QIODevice::WriteOnly));
+		QDataStream out(&buffer);
+		out << olive::TrackReference(olive::TrackReference::k_audio, 4)
+			<< olive::TrackReference();
+	}
+
+	QBuffer buffer(&bytes);
+	ASSERT_TRUE(buffer.open(QIODevice::ReadOnly));
+	QDataStream in(&buffer);
+	olive::TrackReference first, second;
+	in >> first >> second;
+
+	EXPECT_EQ(first, olive::TrackReference(olive::TrackReference::k_audio, 4));
+	EXPECT_EQ(second, olive::TrackReference());
+}
+
+TEST(OakValueHelper, QVariantToOakNodeValueScalars)
+{
+	oak_node_value out;
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_int,
+											  QVariant(42), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_INT);
+	EXPECT_EQ(out.num, 42);
+
+	// Combos map to the COMBO facade type, not INT
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_combo,
+											  QVariant(3), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_COMBO);
+	EXPECT_EQ(out.num, 3);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_float,
+											  QVariant(2.5), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_FLOAT);
+	EXPECT_DOUBLE_EQ(out.f[0], 2.5);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_boolean,
+											  QVariant(true), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_BOOL);
+	EXPECT_EQ(out.num, 1);
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_boolean,
+											  QVariant(false), &out));
+	EXPECT_EQ(out.num, 0);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_rational,
+		QVariant::fromValue(olive::core::Rational(1001, 30000)), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_RATIONAL);
+	EXPECT_EQ(out.num, 1001);
+	EXPECT_EQ(out.den, 30000);
+
+	// Types with no POD representation fail
+	EXPECT_FALSE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_text,
+											   QVariant(QStringLiteral("x")),
+											   &out));
+	EXPECT_FALSE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_matrix,
+											   QVariant(), &out));
+}
+
+TEST(OakValueHelper, QVariantToOakNodeValueColorAndVectors)
+{
+	oak_node_value out;
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_color,
+		QVariant::fromValue(olive::core::Color(0.25f, 0.5f, 0.75f, 1.0f)),
+		&out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_COLOR);
+	EXPECT_DOUBLE_EQ(out.f[0], 0.25);
+	EXPECT_DOUBLE_EQ(out.f[1], 0.5);
+	EXPECT_DOUBLE_EQ(out.f[2], 0.75);
+	EXPECT_DOUBLE_EQ(out.f[3], 1.0);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_vec2,
+		QVariant::fromValue(QVector2D(1.0f, 2.0f)), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_VEC2);
+	EXPECT_DOUBLE_EQ(out.f[0], 1.0);
+	EXPECT_DOUBLE_EQ(out.f[1], 2.0);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_vec3,
+		QVariant::fromValue(QVector3D(1.0f, 2.0f, 3.0f)), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_VEC3);
+	EXPECT_DOUBLE_EQ(out.f[2], 3.0);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_vec4,
+		QVariant::fromValue(QVector4D(1.0f, 2.0f, 3.0f, 4.0f)), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_VEC4);
+	EXPECT_DOUBLE_EQ(out.f[3], 4.0);
+}
+
+TEST(OakValueHelper, TrackComponentUsesDeclaredTypeWithSingleSlot)
+{
+	oak_node_value out;
+
+	// Beziers take a FLOAT per track, not the full-bezier POD type
+	ASSERT_TRUE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_bezier, QVariant(0.75), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_FLOAT);
+	EXPECT_DOUBLE_EQ(out.f[0], 0.75);
+
+	// A color channel is one float in f[0] but keeps the COLOR type
+	ASSERT_TRUE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_color, QVariant(0.5), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_COLOR);
+	EXPECT_DOUBLE_EQ(out.f[0], 0.5);
+	EXPECT_DOUBLE_EQ(out.f[1], 0.0);
+
+	ASSERT_TRUE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_vec4, QVariant(1.5), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_VEC4);
+	EXPECT_DOUBLE_EQ(out.f[0], 1.5);
+
+	ASSERT_TRUE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_combo, QVariant(2), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_COMBO);
+	EXPECT_EQ(out.num, 2);
+
+	ASSERT_TRUE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_rational,
+		QVariant::fromValue(olive::core::Rational(1, 24)), &out));
+	EXPECT_EQ(out.type, OAK_NODE_VALUE_RATIONAL);
+	EXPECT_EQ(out.num, 1);
+	EXPECT_EQ(out.den, 24);
+
+	EXPECT_FALSE(olive::NodeTrackComponentToOakNodeValue(
+		olive::NodeValueType::k_text, QVariant(QStringLiteral("x")), &out));
+}
+
+TEST(OakValueHelper, PodBackToQVariantRoundTrips)
+{
+	oak_node_value pod;
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_int,
+											  QVariant(17), &pod));
+	EXPECT_EQ(olive::OakNodeValueToQVariant(pod).toLongLong(), 17);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_float,
+											  QVariant(3.25), &pod));
+	EXPECT_DOUBLE_EQ(olive::OakNodeValueToQVariant(pod).toDouble(), 3.25);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_boolean,
+											  QVariant(true), &pod));
+	EXPECT_TRUE(olive::OakNodeValueToQVariant(pod).toBool());
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_rational,
+		QVariant::fromValue(olive::core::Rational(24, 1)), &pod));
+	EXPECT_EQ(olive::OakNodeValueToQVariant(pod).value<olive::core::Rational>(),
+			  olive::core::Rational(24, 1));
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_color,
+		QVariant::fromValue(olive::core::Color(0.1f, 0.2f, 0.3f, 0.4f)), &pod));
+	const olive::core::Color c =
+		olive::OakNodeValueToQVariant(pod).value<olive::core::Color>();
+	EXPECT_FLOAT_EQ(c.red(), 0.1f);
+	EXPECT_FLOAT_EQ(c.green(), 0.2f);
+	EXPECT_FLOAT_EQ(c.blue(), 0.3f);
+	EXPECT_FLOAT_EQ(c.alpha(), 0.4f);
+
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(
+		olive::NodeValueType::k_vec3,
+		QVariant::fromValue(QVector3D(4.0f, 5.0f, 6.0f)), &pod));
+	EXPECT_EQ(olive::OakNodeValueToQVariant(pod).value<QVector3D>(),
+			  QVector3D(4.0f, 5.0f, 6.0f));
+
+	// Combos come back as plain ints
+	ASSERT_TRUE(olive::QVariantToOakNodeValue(olive::NodeValueType::k_combo,
+											  QVariant(5), &pod));
+	EXPECT_EQ(olive::OakNodeValueToQVariant(pod).toInt(), 5);
+
+	// Types with no POD representation produce an invalid QVariant
+	pod.type = OAK_NODE_VALUE_STRING;
+	EXPECT_FALSE(olive::OakNodeValueToQVariant(pod).isValid());
+	pod.type = OAK_NODE_VALUE_BINARY;
+	EXPECT_FALSE(olive::OakNodeValueToQVariant(pod).isValid());
+	pod.type = OAK_NODE_VALUE_NONE;
+	EXPECT_FALSE(olive::OakNodeValueToQVariant(pod).isValid());
+}
+
+TEST(OakValueHelper, KeyframeTypeToFacadeRenumbering)
+{
+	// Facade easing: 0=linear, 1=bezier, 2=hold — NOT the engine ordinals
+	EXPECT_EQ(olive::NodeKeyframeTypeToFacade(olive::NodeKeyframeType::k_linear),
+			  0);
+	EXPECT_EQ(olive::NodeKeyframeTypeToFacade(olive::NodeKeyframeType::k_bezier),
+			  1);
+	EXPECT_EQ(olive::NodeKeyframeTypeToFacade(olive::NodeKeyframeType::k_hold), 2);
+
+	// Anything else (including k_invalid) falls back to linear
+	EXPECT_EQ(olive::NodeKeyframeTypeToFacade(olive::NodeKeyframeType::k_invalid),
+			  0);
+	EXPECT_EQ(olive::NodeKeyframeTypeToFacade(99), 0);
+}
+
+TEST(UndoWrapper, WrapsRedoUndoAndOwnership)
+{
+	int redo_count = 0;
+	int undo_count = 0;
+	bool destroyed = false;
+
+	void *cmd = olive::wrap_app_undo_command(
+		"GTest counting command",
+		new CountingCmd{ &redo_count, &undo_count, &destroyed });
+	ASSERT_NE(cmd, nullptr);
+	EXPECT_FALSE(destroyed);
+
+	// redo_now/undo_now forward to the wrapped object
+	EXPECT_EQ(oakengine_undo_command_redo_now(cmd), 0);
+	EXPECT_EQ(redo_count, 1);
+	EXPECT_EQ(undo_count, 0);
+
+	EXPECT_EQ(oakengine_undo_command_undo_now(cmd), 0);
+	EXPECT_EQ(undo_count, 1);
+
+	EXPECT_EQ(oakengine_undo_command_redo_now(cmd), 0);
+	EXPECT_EQ(redo_count, 2);
+
+	// Freeing the engine command deletes the wrapped object exactly once
+	oakengine_undo_command_free(cmd);
+	EXPECT_TRUE(destroyed);
+}
+
+TEST(ConfigWrapper, IntRoundTripAndComparisons)
+{
+	const ScopedConfigKey guard(QStringLiteral("GTestConfigWrapperInt"));
+
+	olive::OakConfigValue value(QStringLiteral("GTestConfigWrapperInt"));
+
+	value = 42;
+	EXPECT_EQ(value.toInt(), 42);
+	EXPECT_EQ(static_cast<qint64>(value), 42);
+	EXPECT_TRUE(value == 42);
+	EXPECT_FALSE(value != 42);
+	EXPECT_TRUE(value == qint64(42));
+	EXPECT_TRUE(value.toBool()); // non-zero reads as true
+
+	value = 0;
+	EXPECT_EQ(value.toInt(), 0);
+	EXPECT_FALSE(value.toBool());
+
+	// Large values survive the int64 round trip
+	value = qint64(5000000000LL);
+	EXPECT_EQ(value.toLongLong(), 5000000000LL);
+}
+
+TEST(ConfigWrapper, StringRoundTripAndComparisons)
+{
+	const ScopedConfigKey guard(QStringLiteral("GTestConfigWrapperString"));
+
+	olive::OakConfigValue value(QStringLiteral("GTestConfigWrapperString"));
+
+	value = QStringLiteral("hello world");
+	EXPECT_EQ(value.toString(), QStringLiteral("hello world"));
+	EXPECT_TRUE(value == QStringLiteral("hello world"));
+	EXPECT_TRUE(value == "hello world");
+	EXPECT_FALSE(value != "hello world");
+	EXPECT_TRUE(value != "goodbye");
+
+	// const char* assignment, including UTF-8 payloads
+	value = "caf\u00E9";
+	EXPECT_EQ(value.toString(), QStringLiteral("caf\u00E9"));
+
+	// The QVariant conversion yields a string variant
+	const QVariant as_variant = static_cast<QVariant>(value);
+	EXPECT_EQ(as_variant.typeId(), QMetaType::QString);
+	EXPECT_EQ(as_variant.toString(), QStringLiteral("caf\u00E9"));
+}
+
+TEST(ConfigWrapper, QVariantAssignmentDispatchesByType)
+{
+	const ScopedConfigKey guard(QStringLiteral("GTestConfigWrapperVariant"));
+
+	olive::OakConfigValue value(QStringLiteral("GTestConfigWrapperVariant"));
+
+	value = QVariant(true);
+	EXPECT_TRUE(value.toBool());
+
+	value = QVariant(7);
+	EXPECT_EQ(value.toInt(), 7);
+
+	// Floating point variants are truncated to int64 by design
+	value = QVariant(3.9);
+	EXPECT_EQ(value.toLongLong(), 3);
+
+	// Everything else falls back to its string form
+	value = QVariant(QStringLiteral("plain"));
+	EXPECT_EQ(value.toString(), QStringLiteral("plain"));
+}
+
+TEST(ConfigWrapper, RationalValueParsesStoredString)
+{
+	const ScopedConfigKey guard(QStringLiteral("GTestConfigWrapperRational"));
+
+	olive::OakConfigValue value(QStringLiteral("GTestConfigWrapperRational"));
+
+	value = QStringLiteral("1001/30000");
+	const olive::core::Rational r = value.value<olive::core::Rational>();
+	EXPECT_EQ(r, olive::core::Rational(1001, 30000));
+	EXPECT_EQ(r.numerator(), 1001);
+	EXPECT_EQ(r.denominator(), 30000);
+}
+
+TEST(ConfigWrapper, MissingKeyReadsDefaults)
+{
+	// No guard: this key must never exist, so there is nothing to restore
+	olive::OakConfigValue value(
+		QStringLiteral("GTestConfigWrapperDefinitelyMissing"));
+
+	EXPECT_FALSE(value.toBool());
+	EXPECT_EQ(value.toInt(), 0);
+	EXPECT_EQ(value.toLongLong(), 0);
+	EXPECT_TRUE(value.toString().isEmpty());
+}
+
+TEST(ConfigWrapper, OakConfigMacrosBuildValues)
+{
+	const ScopedConfigKey guard(QStringLiteral("GTestConfigWrapperMacro"));
+
+	OAK_CONFIG("GTestConfigWrapperMacro") = 9;
+	EXPECT_EQ(OAK_CONFIG("GTestConfigWrapperMacro").toInt(), 9);
+
+	OAK_CONFIG_STR(QStringLiteral("GTestConfigWrapperMacro")) =
+		QStringLiteral("macro");
+	EXPECT_EQ(OAK_CONFIG_STR(QStringLiteral("GTestConfigWrapperMacro")).toString(),
+			  QStringLiteral("macro"));
+}
+
+TEST(SubtitleApp, DefaultAndParameterizedConstruction)
+{
+	const olive::SubtitleApp empty;
+	EXPECT_TRUE(empty.text().isEmpty());
+
+	const olive::SubtitleApp sub(
+		olive::core::TimeRange(olive::core::Rational(1, 24),
+							   olive::core::Rational(48, 24)),
+		QStringLiteral("Hello"));
+	EXPECT_EQ(sub.text(), QStringLiteral("Hello"));
+	EXPECT_EQ(sub.time().in(), olive::core::Rational(1, 24));
+	EXPECT_EQ(sub.time().out(), olive::core::Rational(48, 24));
+	EXPECT_EQ(sub.time().length(), olive::core::Rational(47, 24));
+}
+
+TEST(SubtitleApp, SettersRoundTrip)
+{
+	olive::SubtitleApp sub;
+
+	sub.set_text(QStringLiteral("First"));
+	EXPECT_EQ(sub.text(), QStringLiteral("First"));
+
+	sub.set_time(olive::core::TimeRange(olive::core::Rational(0, 1),
+										olive::core::Rational(10, 1)));
+	EXPECT_EQ(sub.time().in(), olive::core::Rational(0, 1));
+	EXPECT_EQ(sub.time().out(), olive::core::Rational(10, 1));
+
+	sub.set_text(QStringLiteral("Second"));
+	EXPECT_EQ(sub.text(), QStringLiteral("Second"));
+}
+
+TEST(SubtitleApp, MetatypeRoundTrip)
+{
+	const olive::SubtitleApp sub(
+		olive::core::TimeRange(olive::core::Rational(2, 1),
+							   olive::core::Rational(5, 1)),
+		QStringLiteral("Packed"));
+
+	const QVariant v = QVariant::fromValue(sub);
+	EXPECT_EQ(v.typeId(), qMetaTypeId<olive::SubtitleApp>());
+
+	const olive::SubtitleApp out = v.value<olive::SubtitleApp>();
+	EXPECT_EQ(out.text(), QStringLiteral("Packed"));
+	EXPECT_EQ(out.time(), sub.time());
+}
+
+TEST(DebugApp, HandlerFormatsMessageTypeAndContext)
+{
+	testing::internal::CaptureStderr();
+	olive::debug_handler(QtDebugMsg, QMessageLogContext("file.cpp", 12, "func",
+													  "category"),
+						 QStringLiteral("hello"));
+	const std::string out = testing::internal::GetCapturedStderr();
+
+	EXPECT_NE(out.find("Debug: hello"), std::string::npos);
+	EXPECT_NE(out.find("file.cpp"), std::string::npos);
+	EXPECT_NE(out.find("func"), std::string::npos);
+
+	// A null context file/function is reported as <null>
+	testing::internal::CaptureStderr();
+	olive::debug_handler(QtInfoMsg, QMessageLogContext(), QStringLiteral("plain"));
+	const std::string out2 = testing::internal::GetCapturedStderr();
+	EXPECT_NE(out2.find("Info: plain"), std::string::npos);
+	EXPECT_NE(out2.find("<null>"), std::string::npos);
+}
+
+TEST(DebugApp, HandlerSuppressesFilteredWarnings)
+{
+	// QXcbIntegration noise is always dropped
+	testing::internal::CaptureStderr();
+	olive::debug_handler(QtWarningMsg, QMessageLogContext(),
+						 QStringLiteral("QXcbIntegration: something"));
+	EXPECT_TRUE(testing::internal::GetCapturedStderr().empty());
+
+	// Other warnings depend on the OAK_TESTING environment variable, which the
+	// handler samples once; mirror that expectation here
+	testing::internal::CaptureStderr();
+	olive::debug_handler(QtWarningMsg, QMessageLogContext(),
+						 QStringLiteral("ordinary warning"));
+	const std::string out = testing::internal::GetCapturedStderr();
+	if (qEnvironmentVariableIsSet("OAK_TESTING")) {
+		EXPECT_TRUE(out.empty());
+	} else {
+		EXPECT_NE(out.find("Warning: ordinary warning"), std::string::npos);
+	}
+}

tests/gtest/dialog_misc2_test.cpp

@@ -0,0 +1,672 @@
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include <QCheckBox>
+#include <QComboBox>
+#include <QDir>
+#include <QFile>
+#include <QGroupBox>
+#include <QImage>
+#include <QSizePolicy>
+#include <QSlider>
+#include <QStandardPaths>
+#include <QStringList>
+#include <QXmlStreamReader>
+#include <QXmlStreamWriter>
+
+#include "dialog/about/scrollinglabel.h"
+#include "dialog/export/codec/av1section.h"
+#include "dialog/export/codec/cineformsection.h"
+#include "dialog/export/codec/codecsection.h"
+#include "dialog/export/codec/codecstack.h"
+#include "dialog/footageproperties/streamproperties/audiostreamproperties.h"
+#include "dialog/footageproperties/streamproperties/streamproperties.h"
+#include "dialog/footageproperties/streamproperties/videostreamproperties.h"
+#include "dialog/sequence/presetmanager.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/project.h"
+#include "node/project/footage/footage.h"
+#include "oakengine/encoding.h"
+#include "oakengine/footage.h"
+#include "oakutil/qtutils.h"
+#include "render/videoparams.h"
+#include "widget/slider/integerslider.h"
+#include "widget/standardcombos/interlacedcombobox.h"
+#include "widget/standardcombos/pixelaspectratiocombobox.h"
+
+// dialog/about/patreon.h defines a global `QStringList patrons` (without
+// extern); about.cpp already pulls that definition into the test binary, so
+// including the header here would create a duplicate symbol. Reference the
+// existing definition with a matching extern declaration instead.
+extern QStringList patrons;
+
+namespace
+{
+
+// Redirects QStandardPaths (used for the preset file location) to a
+// disposable test location for the lifetime of the guard
+class StandardPathsTestModeGuard {
+public:
+	StandardPathsTestModeGuard()
+	{
+		QStandardPaths::setTestModeEnabled(true);
+	}
+
+	~StandardPathsTestModeGuard()
+	{
+		QStandardPaths::setTestModeEnabled(false);
+	}
+};
+
+// Concrete Preset with a name and an integer so the PresetManager load/save
+// cycle has something observable to round-trip
+class NameValuePreset : public olive::Preset {
+public:
+	int value_ = 0;
+
+	virtual void load(QXmlStreamReader *reader) override
+	{
+		while (olive::xml_read_next_start_element(reader)) {
+			if (reader->name() == QStringLiteral("name")) {
+				set_name(reader->readElementText());
+			} else if (reader->name() == QStringLiteral("value")) {
+				value_ = reader->readElementText().toInt();
+			} else {
+				reader->skipCurrentElement();
+			}
+		}
+	}
+
+	virtual void save(QXmlStreamWriter *writer) const override
+	{
+		writer->writeTextElement(QStringLiteral("name"), get_name());
+		writer->writeTextElement(QStringLiteral("value"),
+								 QString::number(value_));
+	}
+};
+
+// Footage subclass that exposes the protected stream mutator of ViewerOutput
+// so tests can populate streams without probing real media
+class TestableFootage : public olive::Footage {
+public:
+	using olive::ViewerOutput::add_stream;
+};
+
+// A footage node with two video streams; the second carries the given
+// (possibly empty) explicit colorspace override
+TestableFootage *make_two_stream_footage(olive::Project *project,
+										 const QString &explicit_colorspace)
+{
+	auto *footage = new TestableFootage();
+	footage->setParent(project);
+
+	olive::VideoParams v0(1920, 1080, olive::Rational(1, 24),
+						  olive::core::PixelFormat::u8, 4);
+	v0.set_stream_index(0);
+	v0.set_duration(48);
+	footage->add_stream(olive::Track::k_video, QVariant::fromValue(v0));
+
+	olive::VideoParams v1(1280, 720, olive::Rational(1, 24),
+						  olive::core::PixelFormat::u8, 4);
+	v1.set_stream_index(1);
+	v1.set_duration(48);
+	v1.set_colorspace(explicit_colorspace);
+	footage->add_stream(olive::Track::k_video, QVariant::fromValue(v1));
+
+	return footage;
+}
+
+// The plain (non-combo-class) QComboBoxes of a VideoStreamProperties, in
+// layout order: color space first, then color range. The widget also holds a
+// PixelAspectRatioComboBox and an InterlacedComboBox, so filter those out.
+QList<QComboBox *> plain_combos(QWidget *w)
+{
+	QList<QComboBox *> out;
+	foreach (QComboBox *c, w->findChildren<QComboBox *>()) {
+		if (!qobject_cast<olive::PixelAspectRatioComboBox *>(c) &&
+			!qobject_cast<olive::InterlacedComboBox *>(c)) {
+			out.append(c);
+		}
+	}
+	return out;
+}
+
+// Renders the widget and counts pixels drawn in its palette text color.
+// QWidget::render() fills an opaque window-color background, so alpha-based
+// checks are useless; the scrolling text is painted in palette().text().
+int count_text_pixels(QWidget *w)
+{
+	QImage img(w->size(), QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	w->render(&img);
+
+	const QColor text = w->palette().text().color();
+
+	int count = 0;
+	for (int y = 0; y < img.height(); y++) {
+		for (int x = 0; x < img.width(); x++) {
+			const QColor px = img.pixelColor(x, y);
+			if (qAbs(px.red() - text.red()) < 16 &&
+				qAbs(px.green() - text.green()) < 16 &&
+				qAbs(px.blue() - text.blue()) < 16) {
+				count++;
+			}
+		}
+	}
+	return count;
+}
+
+} // namespace
+
+//
+// about: patreon
+//
+TEST(DialogAboutPatreon, PatronsListIsEmptyInSourceTree)
+{
+	// The committed patreon.h is generated with no entries; patreon.py fills
+	// the list in when packaging a release
+	EXPECT_TRUE(patrons.isEmpty());
+}
+
+//
+// about: scrollinglabel
+//
+TEST(DialogScrollingLabel, SetTextSizesMinimumToContent)
+{
+	olive::ScrollingLabel label;
+	EXPECT_EQ(label.minimumSize(), QSize(0, 0));
+
+	const QString long_line =
+		QStringLiteral("A considerably longer line of text");
+	label.set_text({ QStringLiteral("Hi"), long_line });
+
+	QFontMetrics fm = label.fontMetrics();
+
+	// Minimum height is always ten lines, minimum width the widest line
+	EXPECT_EQ(label.minimumHeight(), fm.height() * 10);
+	EXPECT_EQ(label.minimumWidth(),
+			  olive::QtUtils::q_font_metrics_width(fm, long_line));
+
+	// A narrower text shrinks the minimum width again
+	label.set_text({ QStringLiteral("Hi") });
+	EXPECT_EQ(label.minimumWidth(),
+			  olive::QtUtils::q_font_metrics_width(fm, QStringLiteral("Hi")));
+	EXPECT_EQ(label.minimumHeight(), fm.height() * 10);
+
+	// The text-list constructor applies the same sizing
+	olive::ScrollingLabel label2({ QStringLiteral("Hi") });
+	EXPECT_EQ(label2.minimumWidth(),
+			  olive::QtUtils::q_font_metrics_width(fm, QStringLiteral("Hi")));
+}
+
+TEST(DialogScrollingLabel, EmptyTextKeepsOnlyLineHeightMinimum)
+{
+	olive::ScrollingLabel label;
+	label.set_text({});
+
+	EXPECT_EQ(label.minimumWidth(), 0);
+	EXPECT_EQ(label.minimumHeight(), label.fontMetrics().height() * 10);
+}
+
+TEST(DialogScrollingLabel, AnimationScrollsTextIntoView)
+{
+	olive::ScrollingLabel label(
+		{ QStringLiteral("Hello"), QStringLiteral("World") });
+	label.resize(120, 200);
+
+	// At offset zero every line sits below the widget: nothing is painted
+	EXPECT_EQ(count_text_pixels(&label), 0);
+
+	// animation_update() is a private slot; drive it through the meta-object.
+	// Half the widget height puts the first line near the vertical middle.
+	for (int i = 0; i < 100; i++) {
+		QMetaObject::invokeMethod(&label, "animation_update");
+	}
+	EXPECT_GT(count_text_pixels(&label), 0);
+}
+
+TEST(DialogScrollingLabel, AnimationWrapsAfterFullCycle)
+{
+	olive::ScrollingLabel label(
+		{ QStringLiteral("Hello"), QStringLiteral("World") });
+	label.resize(120, 200);
+
+	// animate_ resets to 0 once it reaches height + lines * line_height
+	const int cycle = 200 + 2 * label.fontMetrics().height();
+	for (int i = 0; i < cycle; i++) {
+		QMetaObject::invokeMethod(&label, "animation_update");
+	}
+
+	// Back at offset zero the text has scrolled out of view again
+	EXPECT_EQ(count_text_pixels(&label), 0);
+
+	// start/stop only toggle the internal timer
+	label.start_animating();
+	label.stop_animating();
+}
+
+//
+// sequence: presetmanager
+//
+TEST(DialogPresetManager, StartsEmptyWhenPresetFileMissing)
+{
+	StandardPathsTestModeGuard test_mode;
+
+	const QString preset_name =
+		QStringLiteral("oak-gtest-presetmanager-missing");
+	const QString path =
+		QDir(olive::FileFunctions::get_configuration_location())
+			.filePath(preset_name);
+	QFile::remove(path);
+
+	{
+		olive::PresetManager<NameValuePreset> mgr(nullptr, preset_name);
+		EXPECT_EQ(mgr.get_number_of_presets(), 0);
+		EXPECT_TRUE(mgr.get_preset_data().isEmpty());
+		EXPECT_TRUE(mgr.get_custom_preset_filename().endsWith(preset_name));
+	}
+
+	// The destructor wrote an empty preset file; clean it up
+	QFile::remove(path);
+}
+
+TEST(DialogPresetManager, LoadsPresetsFromXmlFile)
+{
+	StandardPathsTestModeGuard test_mode;
+
+	const QString preset_name =
+		QStringLiteral("oak-gtest-presetmanager-load");
+	const QString path =
+		QDir(olive::FileFunctions::get_configuration_location())
+			.filePath(preset_name);
+	QFile::remove(path);
+
+	{
+		QFile f(path);
+		ASSERT_TRUE(f.open(QFile::WriteOnly));
+		f.write("<?xml version=\"1.0\"?>\n"
+				"<presets>\n"
+				"  <preset><name>Alpha</name><value>7</value></preset>\n"
+				"  <preset><name>Beta</name><value>8</value></preset>\n"
+				"</presets>\n");
+		f.close();
+	}
+
+	{
+		olive::PresetManager<NameValuePreset> mgr(nullptr, preset_name);
+
+		ASSERT_EQ(mgr.get_number_of_presets(), 2);
+		EXPECT_EQ(mgr.get_preset(0)->get_name(), QStringLiteral("Alpha"));
+		EXPECT_EQ(mgr.get_preset(1)->get_name(), QStringLiteral("Beta"));
+		EXPECT_EQ(
+			std::static_pointer_cast<NameValuePreset>(mgr.get_preset(0))->value_,
+			7);
+		EXPECT_EQ(
+			std::static_pointer_cast<NameValuePreset>(mgr.get_preset(1))->value_,
+			8);
+		EXPECT_EQ(mgr.get_preset_data().size(), 2);
+
+		mgr.delete_preset(0);
+		ASSERT_EQ(mgr.get_number_of_presets(), 1);
+		EXPECT_EQ(mgr.get_preset(0)->get_name(), QStringLiteral("Beta"));
+
+		// Change the surviving preset so the destructor's save has something
+		// new to write
+		std::static_pointer_cast<NameValuePreset>(mgr.get_preset(0))->value_ =
+			42;
+	}
+
+	// The destructor persisted the current preset list to disk
+	{
+		olive::PresetManager<NameValuePreset> mgr(nullptr, preset_name);
+		ASSERT_EQ(mgr.get_number_of_presets(), 1);
+		EXPECT_EQ(mgr.get_preset(0)->get_name(), QStringLiteral("Beta"));
+		EXPECT_EQ(
+			std::static_pointer_cast<NameValuePreset>(mgr.get_preset(0))->value_,
+			42);
+	}
+
+	QFile::remove(path);
+}
+
+//
+// export: codecsection (base class)
+//
+TEST(DialogCodecSection, BaseClassOptsAreNoOps)
+{
+	olive::CodecSection section;
+
+	OakEngineEncodingParams *params = oakengine_encoding_params_create();
+	ASSERT_NE(params, nullptr);
+
+	section.add_opts(params);
+
+	// A base CodecSection writes no encoder options
+	char buf[64];
+	EXPECT_EQ(oakengine_encoding_params_video_option(params, "qp", buf,
+													 static_cast<int>(sizeof(buf))),
+			  OAKENGINE_E_NOT_FOUND);
+
+	// set_opts must accept anything without touching the widget
+	section.set_opts(params);
+
+	oakengine_encoding_params_destroy(params);
+}
+
+//
+// export: codecstack
+//
+TEST(DialogCodecStack, CurrentWidgetExpandsOthersAreIgnored)
+{
+	olive::CodecStack stack;
+	QWidget a;
+	QWidget b;
+
+	stack.addWidget(&a);
+	stack.addWidget(&b);
+
+	ASSERT_EQ(stack.count(), 2);
+	ASSERT_EQ(stack.currentIndex(), 0);
+
+	// addWidget() reapplies the policies for the current index
+	EXPECT_EQ(a.sizePolicy().horizontalPolicy(), QSizePolicy::Expanding);
+	EXPECT_EQ(a.sizePolicy().verticalPolicy(), QSizePolicy::Expanding);
+	EXPECT_EQ(b.sizePolicy().horizontalPolicy(), QSizePolicy::Ignored);
+	EXPECT_EQ(b.sizePolicy().verticalPolicy(), QSizePolicy::Ignored);
+
+	// Switching pages swaps the policies
+	stack.setCurrentIndex(1);
+	EXPECT_EQ(a.sizePolicy().horizontalPolicy(), QSizePolicy::Ignored);
+	EXPECT_EQ(b.sizePolicy().horizontalPolicy(), QSizePolicy::Expanding);
+	EXPECT_EQ(b.sizePolicy().verticalPolicy(), QSizePolicy::Expanding);
+}
+
+//
+// export: av1section
+//
+TEST(DialogAV1CRFSection, DefaultsAndSliderRange)
+{
+	// Copy to a local first: EXPECT_EQ binds by reference, which would
+	// odr-use the in-class-initialized static constant and fail to link
+	const int default_crf = olive::AV1CRFSection::k_default_a_v1_crf;
+	EXPECT_EQ(default_crf, 30);
+
+	olive::AV1CRFSection section(olive::AV1CRFSection::k_default_a_v1_crf);
+	EXPECT_EQ(section.get_value(), 30);
+
+	QSlider *slider = section.findChild<QSlider *>();
+	ASSERT_NE(slider, nullptr);
+	EXPECT_EQ(slider->minimum(), 0);
+	EXPECT_EQ(slider->maximum(), 63);
+
+	// The slider is the value source, clamped to 0-63
+	slider->setValue(45);
+	EXPECT_EQ(section.get_value(), 45);
+
+	slider->setValue(99);
+	EXPECT_EQ(section.get_value(), 63);
+}
+
+TEST(DialogAV1CRFSection, SliderSyncsIntoIntegerInput)
+{
+	olive::AV1CRFSection section(30);
+
+	QSlider *slider = section.findChild<QSlider *>();
+	olive::IntegerSlider *input = section.findChild<olive::IntegerSlider *>();
+	ASSERT_NE(slider, nullptr);
+	ASSERT_NE(input, nullptr);
+	EXPECT_EQ(input->get_value(), 30);
+
+	// QSlider::valueChanged is wired to IntegerSlider::set_value
+	slider->setValue(20);
+	EXPECT_EQ(input->get_value(), 20);
+}
+
+TEST(DialogAV1Section, DefaultsAndAddOpts)
+{
+	olive::AV1Section section;
+
+	// First combo is the preset list (0-13, default 8), second the
+	// compression method list (Constant Rate Factor only)
+	const auto combos = section.findChildren<QComboBox *>();
+	ASSERT_EQ(combos.size(), 2);
+	EXPECT_EQ(combos.at(0)->count(), 14);
+	EXPECT_EQ(combos.at(0)->currentIndex(), 8);
+	EXPECT_EQ(combos.at(1)->count(), 1);
+
+	OakEngineEncodingParams *params = oakengine_encoding_params_create();
+	ASSERT_NE(params, nullptr);
+
+	char buf[64];
+
+	// Default construction uses the default CRF
+	section.add_opts(params);
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "qp", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("30"));
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "preset", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("8"));
+
+	// Changed widget state is reflected in the written options
+	combos.at(0)->setCurrentIndex(3);
+	QSlider *slider = section.findChild<QSlider *>();
+	ASSERT_NE(slider, nullptr);
+	slider->setValue(20);
+
+	section.add_opts(params);
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "qp", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("20"));
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "preset", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("3"));
+
+	oakengine_encoding_params_destroy(params);
+}
+
+//
+// export: cineformsection
+//
+TEST(DialogCineformSection, DefaultsToMediumQuality)
+{
+	olive::CineformSection section;
+
+	QComboBox *quality = section.findChild<QComboBox *>();
+	ASSERT_NE(quality, nullptr);
+
+	// 13 FFmpeg quality levels (film3+ .. low), defaulting to "medium"
+	EXPECT_EQ(quality->count(), 13);
+	EXPECT_EQ(quality->currentIndex(), 10);
+}
+
+TEST(DialogCineformSection, OptsRoundTripThroughParams)
+{
+	olive::CineformSection section;
+	QComboBox *quality = section.findChild<QComboBox *>();
+	ASSERT_NE(quality, nullptr);
+
+	OakEngineEncodingParams *params = oakengine_encoding_params_create();
+	ASSERT_NE(params, nullptr);
+
+	char buf[64];
+
+	section.add_opts(params);
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "quality", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("10"));
+
+	quality->setCurrentIndex(5);
+	section.add_opts(params);
+	ASSERT_GT(oakengine_encoding_params_video_option(
+				  params, "quality", buf, static_cast<int>(sizeof(buf))),
+			  0);
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("5"));
+
+	// set_opts applies a stored value back to the combo
+	oakengine_encoding_params_set_video_option(params, "quality", "2");
+	section.set_opts(params);
+	EXPECT_EQ(quality->currentIndex(), 2);
+
+	// A params handle without the key leaves the combo untouched
+	OakEngineEncodingParams *empty = oakengine_encoding_params_create();
+	ASSERT_NE(empty, nullptr);
+	section.set_opts(empty);
+	EXPECT_EQ(quality->currentIndex(), 2);
+
+	oakengine_encoding_params_destroy(empty);
+	oakengine_encoding_params_destroy(params);
+}
+
+//
+// footageproperties: streamproperties (base class)
+//
+TEST(DialogStreamProperties, BaseClassIsANoOpStub)
+{
+	olive::StreamProperties props;
+
+	EXPECT_TRUE(props.sanity_check());
+
+	// accept() takes an optional parent pointer and does nothing
+	props.accept(nullptr);
+}
+
+//
+// footageproperties: audiostreamproperties
+//
+TEST(DialogAudioStreamProperties, ConstructsAroundFootageStream)
+{
+	olive::Project project;
+	TestableFootage *footage = make_two_stream_footage(&project, QString());
+
+	olive::AudioStreamProperties props(
+		reinterpret_cast<OakEngineNode *>(footage), 0);
+
+	// The class is currently a stub: no UI, default sanity check, no-op accept
+	EXPECT_EQ(props.findChildren<QWidget *>().size(), 0);
+	EXPECT_TRUE(props.sanity_check());
+	props.accept(nullptr);
+}
+
+//
+// footageproperties: videostreamproperties
+//
+TEST(DialogVideoStreamProperties, ReflectsStreamDefaults)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	TestableFootage *footage = make_two_stream_footage(&project, QString());
+
+	olive::VideoStreamProperties props(
+		reinterpret_cast<OakEngineNode *>(footage), 0);
+
+	auto *interlace = props.findChild<olive::InterlacedComboBox *>();
+	ASSERT_NE(interlace, nullptr);
+	EXPECT_EQ(interlace->get_interlace_mode(),
+			  olive::VideoParams::k_interlace_none);
+
+	auto *par = props.findChild<olive::PixelAspectRatioComboBox *>();
+	ASSERT_NE(par, nullptr);
+	EXPECT_EQ(par->get_pixel_aspect_ratio(), olive::Rational(1, 1));
+
+	const auto combos = plain_combos(&props);
+	ASSERT_EQ(combos.size(), 2);
+
+	// Color space: "Default (...)" entry followed by every config colorspace
+	QComboBox *colorspace = combos.at(0);
+	EXPECT_TRUE(colorspace->itemText(0).startsWith(QStringLiteral("Default (")));
+	EXPECT_EQ(colorspace->count(),
+			  1 + project.color_manager()->list_available_colorspaces().size());
+	// No override on the stream: the default entry stays selected
+	EXPECT_EQ(colorspace->currentIndex(), 0);
+
+	// Color range: limited/full, matching the stream's limited default
+	QComboBox *range = combos.at(1);
+	ASSERT_EQ(range->count(), 2);
+	EXPECT_EQ(range->itemData(0).toInt(),
+			  olive::VideoParams::k_color_range_limited);
+	EXPECT_EQ(range->itemData(1).toInt(), olive::VideoParams::k_color_range_full);
+	EXPECT_EQ(range->currentIndex(), olive::VideoParams::k_color_range_limited);
+
+	// Regular video is not an image sequence: no image sequence group box
+	EXPECT_EQ(props.findChild<QGroupBox *>(), nullptr);
+
+	// The premultiplied-alpha checkbox only exists for 4-channel processing
+	QCheckBox *premult = props.findChild<QCheckBox *>();
+	if (olive::VideoParams::k_internal_channel_count == 4) {
+		ASSERT_NE(premult, nullptr);
+		EXPECT_FALSE(premult->isChecked());
+	} else {
+		EXPECT_EQ(premult, nullptr);
+	}
+
+	// Not an image sequence, so sanity_check() passes without prompting
+	EXPECT_TRUE(props.sanity_check());
+}
+
+TEST(DialogVideoStreamProperties, ReflectsExplicitColorspaceOverride)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	const QStringList spaces =
+		project.color_manager()->list_available_colorspaces();
+	ASSERT_FALSE(spaces.isEmpty());
+
+	TestableFootage *footage =
+		make_two_stream_footage(&project, spaces.first());
+
+	// Stream 1 carries the explicit colorspace override
+	olive::VideoStreamProperties props(
+		reinterpret_cast<OakEngineNode *>(footage), 1);
+
+	const auto combos = plain_combos(&props);
+	ASSERT_EQ(combos.size(), 2);
+
+	QComboBox *colorspace = combos.at(0);
+	EXPECT_EQ(colorspace->currentText(), spaces.first());
+	EXPECT_GT(colorspace->currentIndex(), 0);
+}
+
+TEST(DialogVideoStreamProperties, AcceptAppliesColorRangeChange)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	TestableFootage *footage = make_two_stream_footage(&project, QString());
+
+	olive::VideoStreamProperties props(
+		reinterpret_cast<OakEngineNode *>(footage), 0);
+
+	const auto combos = plain_combos(&props);
+	ASSERT_EQ(combos.size(), 2);
+	QComboBox *range = combos.at(1);
+
+	auto get_color_range = [&]() {
+		OakEngineFootage *handle = oakengine_footage_borrow(
+			reinterpret_cast<OakEngineNode *>(footage));
+		EXPECT_NE(handle, nullptr);
+		int color_range = -1;
+		oakengine_footage_get_video_stream_overrides(handle, 0, nullptr, 0,
+													 &color_range, nullptr,
+													 nullptr);
+		oakengine_footage_free(handle);
+		return color_range;
+	};
+
+	// Accepting without edits must not touch the stream
+	props.accept(nullptr);
+	EXPECT_EQ(get_color_range(), olive::VideoParams::k_color_range_limited);
+
+	// Switching to full range is written back through the facade
+	range->setCurrentIndex(1);
+	props.accept(nullptr);
+	EXPECT_EQ(get_color_range(), olive::VideoParams::k_color_range_full);
+}

tests/gtest/timeline_common_test.cpp

@@ -0,0 +1,569 @@
+#include <gtest/gtest.h>
+
+#include <QColor>
+#include <QPointer>
+#include <QPushButton>
+#include <QScrollBar>
+#include <QSignalSpy>
+#include <QSplitter>
+#include <QStackedWidget>
+
+#include "core.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/output/track/track.h"
+#include "node/output/track/tracklist.h"
+#include "node/project.h"
+#include "node/project/sequence/sequence.h"
+#include "oakengine/node.h"
+#include "oakengine/timeline.h"
+#include "timeline/timelinecommonapp.h"
+#include "widget/clickablelabel/clickablelabel.h"
+#include "widget/focusablelineedit/focusablelineedit.h"
+#include "widget/timelinewidget/timelineandtrackview.h"
+#include "widget/timelinewidget/trackview/trackview.h"
+#include "widget/timelinewidget/trackview/trackviewitem.h"
+#include "widget/timelinewidget/trackview/trackviewsplitter.h"
+#include "widget/timelinewidget/view/timelineview.h"
+
+namespace
+{
+
+// HandMovableView (base of TimelineView) connects to Core::instance() at
+// construction, so anything embedding a TimelineView needs the singleton
+void ensure_core()
+{
+	if (!olive::Core::instance()) {
+		new olive::Core(); // intentionally leaked
+	}
+}
+
+olive::Sequence *create_sequence(olive::Project *project)
+{
+	auto *sequence = new olive::Sequence();
+	sequence->setParent(project);
+	return sequence;
+}
+
+// Mirrors sequence_test.cpp: grow the track input array, then connect the
+// edge so the TrackList assigns type, index and owning sequence
+olive::Track *append_track(olive::Project *project, olive::Sequence *sequence,
+						   olive::Track::Type type)
+{
+	auto *track = new olive::Track();
+	track->setParent(project);
+	olive::TrackList *list = sequence->track_list(type);
+	list->array_append();
+	olive::Node::connect_edge(track, list->track_input(list->array_size() - 1));
+	return track;
+}
+
+OakEngineSequence *seq_handle(olive::Sequence *sequence)
+{
+	return reinterpret_cast<OakEngineSequence *>(sequence);
+}
+
+OakEngineNode *node_handle(olive::Node *node)
+{
+	return reinterpret_cast<OakEngineNode *>(node);
+}
+
+OakEngineTrack *track_handle(olive::Track *track)
+{
+	return reinterpret_cast<OakEngineTrack *>(track);
+}
+
+// TrackViewItem's mute/lock buttons are distinguished only by the checked
+// color baked into their style sheets (red for mute, gray for lock)
+QPushButton *find_button_by_checked_color(QWidget *parent, const QString &rgb)
+{
+	for (QPushButton *b : parent->findChildren<QPushButton *>()) {
+		if (b->styleSheet().contains(rgb)) {
+			return b;
+		}
+	}
+	return nullptr;
+}
+
+} // namespace
+
+TEST(TimelineApp, MovementModeOrdinalsMatchEngineAbi)
+{
+	// The C ABI transports these as ints (OAKENGINE_MOVEMENT_MODE_*), so the
+	// app-side enum ordinals must stay in sync with the engine
+	EXPECT_EQ(int(olive::TimelineApp::k_none), OAKENGINE_MOVEMENT_MODE_NONE);
+	EXPECT_EQ(int(olive::TimelineApp::k_move), OAKENGINE_MOVEMENT_MODE_MOVE);
+	EXPECT_EQ(int(olive::TimelineApp::k_trim_in), OAKENGINE_MOVEMENT_MODE_TRIM_IN);
+	EXPECT_EQ(int(olive::TimelineApp::k_trim_out),
+			  OAKENGINE_MOVEMENT_MODE_TRIM_OUT);
+}
+
+TEST(TimelineApp, IsATrimMode)
+{
+	EXPECT_TRUE(olive::TimelineApp::is_a_trim_mode(olive::TimelineApp::k_trim_in));
+	EXPECT_TRUE(
+		olive::TimelineApp::is_a_trim_mode(olive::TimelineApp::k_trim_out));
+	EXPECT_FALSE(olive::TimelineApp::is_a_trim_mode(olive::TimelineApp::k_none));
+	EXPECT_FALSE(olive::TimelineApp::is_a_trim_mode(olive::TimelineApp::k_move));
+}
+
+TEST(TimelineApp, ThumbnailAndWaveformOrdinals)
+{
+	EXPECT_EQ(int(olive::TimelineApp::k_thumbnail_off), 0);
+	EXPECT_EQ(int(olive::TimelineApp::k_thumbnail_in_out), 1);
+	EXPECT_EQ(int(olive::TimelineApp::k_thumbnail_on), 2);
+
+	EXPECT_EQ(int(olive::TimelineApp::k_waveforms_disabled), 0);
+	EXPECT_EQ(int(olive::TimelineApp::k_waveforms_enabled), 1);
+}
+
+TEST(TimelineApp, EditToInfoIsPlainStruct)
+{
+	olive::TimelineApp::EditToInfo info;
+	info.track = nullptr;
+	info.nearest_block = nullptr;
+	info.nearest_time = olive::core::Rational(5, 1);
+
+	EXPECT_EQ(info.track, nullptr);
+	EXPECT_EQ(info.nearest_block, nullptr);
+	EXPECT_EQ(info.nearest_time, olive::core::Rational(5, 1));
+
+	olive::TimelineApp::EditToInfo copy = info;
+	EXPECT_EQ(copy.nearest_time, olive::core::Rational(5, 1));
+}
+
+TEST(TimelineAndTrackView, ConstructionWiresSplitterAndViews)
+{
+	ensure_core();
+
+	olive::TimelineAndTrackView tav;
+	ASSERT_NE(tav.splitter(), nullptr);
+	ASSERT_NE(tav.view(), nullptr);
+	ASSERT_NE(tav.track_view(), nullptr);
+
+	EXPECT_EQ(tav.splitter()->orientation(), Qt::Horizontal);
+	EXPECT_FALSE(tav.splitter()->childrenCollapsible());
+	ASSERT_EQ(tav.splitter()->count(), 2);
+
+	// Track headers on the left, timeline view on the right
+	EXPECT_EQ(tav.splitter()->widget(0), tav.track_view());
+	EXPECT_EQ(tav.splitter()->widget(1), tav.view());
+}
+
+TEST(TimelineAndTrackView, ScrollbarsTrackEachOther)
+{
+	ensure_core();
+
+	olive::TimelineAndTrackView tav;
+	QScrollBar *view_sb = tav.view()->verticalScrollBar();
+	QScrollBar *track_sb = tav.track_view()->verticalScrollBar();
+	ASSERT_NE(view_sb, nullptr);
+	ASSERT_NE(track_sb, nullptr);
+
+	// With an empty sequence both scrollbars have a degenerate range; give
+	// them explicit ranges so the sync math is observable. The ranges stick
+	// because nothing relayouts the hidden widget afterwards
+	view_sb->setRange(10, 100);
+	track_sb->setRange(0, 90);
+
+	// Scrolling the view scrolls the track headers by (value - minimum)
+	view_sb->setValue(50);
+	EXPECT_EQ(track_sb->value(), 40);
+
+	// Scrolling the track headers scrolls the view by (minimum + value)
+	track_sb->setValue(25);
+	EXPECT_EQ(view_sb->value(), 35);
+
+	// Deliberately no cleanup of the sync connections: leaving the scrollbars
+	// at non-zero values exercises ~TimelineAndTrackView, which must detach
+	// them before the child views reset their scenes during teardown
+}
+
+TEST(TrackView, ConstructionDefaults)
+{
+	olive::TrackView view;
+	EXPECT_EQ(view.horizontalScrollBarPolicy(), Qt::ScrollBarAlwaysOff);
+	EXPECT_EQ(view.verticalScrollBarPolicy(), Qt::ScrollBarAlwaysOff);
+	EXPECT_TRUE(view.widgetResizable());
+	EXPECT_EQ(view.alignment(), Qt::Alignment(Qt::AlignLeft | Qt::AlignTop));
+
+	auto *splitter = view.findChild<olive::TrackViewSplitter *>();
+	ASSERT_NE(splitter, nullptr);
+	EXPECT_EQ(splitter->orientation(), Qt::Vertical);
+	// Only the trailing spacer widget before any track list is connected
+	EXPECT_EQ(splitter->count(), 1);
+
+	olive::TrackView bottom(Qt::AlignBottom);
+	EXPECT_EQ(bottom.alignment(), Qt::Alignment(Qt::AlignLeft | Qt::AlignBottom));
+}
+
+TEST(TrackView, ConnectTrackListPopulatesAndDisconnectClears)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	append_track(&project, sequence, olive::Track::k_video);
+	append_track(&project, sequence, olive::Track::k_video);
+	append_track(&project, sequence, olive::Track::k_audio);
+
+	olive::TrackView view;
+	auto *splitter = view.findChild<olive::TrackViewSplitter *>();
+	ASSERT_NE(splitter, nullptr);
+	EXPECT_EQ(splitter->count(), 1);
+
+	// Binding the video track list adds one item per track (plus the spacer)
+	view.connect_track_list(seq_handle(sequence), OAKENGINE_TRACK_TYPE_VIDEO);
+	EXPECT_EQ(splitter->count(), 3);
+
+	// Rebinding to the audio list swaps the items, it doesn't accumulate
+	view.connect_track_list(seq_handle(sequence), OAKENGINE_TRACK_TYPE_AUDIO);
+	EXPECT_EQ(splitter->count(), 2);
+
+	view.disconnect_track_list();
+	EXPECT_EQ(splitter->count(), 1);
+}
+
+TEST(TrackView, InsertAndRemoveTrackUpdateSplitter)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	append_track(&project, sequence, olive::Track::k_video);
+
+	olive::TrackView view;
+	auto *splitter = view.findChild<olive::TrackViewSplitter *>();
+	ASSERT_NE(splitter, nullptr);
+
+	view.connect_track_list(seq_handle(sequence), OAKENGINE_TRACK_TYPE_VIDEO);
+	ASSERT_EQ(splitter->count(), 2);
+
+	// A track added to the sequence afterwards can be inserted explicitly
+	olive::Track *t2 = append_track(&project, sequence, olive::Track::k_video);
+	view.insert_track(track_handle(t2));
+	ASSERT_EQ(splitter->count(), 3);
+
+	// AlignTop ordering: items first, spacer last
+	QPointer<QWidget> item = splitter->widget(1);
+	ASSERT_FALSE(item.isNull());
+
+	view.remove_track(track_handle(t2));
+	EXPECT_EQ(splitter->count(), 2);
+	// remove() deletes the item widget
+	EXPECT_TRUE(item.isNull());
+}
+
+TEST(TrackViewItem, LabelShowsTypePrefixAndCustomLabel)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	olive::Track *v1 = append_track(&project, sequence, olive::Track::k_video);
+	olive::Track *v2 = append_track(&project, sequence, olive::Track::k_video);
+	olive::Track *a1 = append_track(&project, sequence, olive::Track::k_audio);
+	olive::Track *s1 = append_track(&project, sequence, olive::Track::k_subtitle);
+
+	ASSERT_EQ(
+		oakengine_node_set_label(node_handle(v1), "Hero"), 0);
+
+	olive::TrackViewItem item_v1(track_handle(v1));
+	olive::TrackViewItem item_v2(track_handle(v2));
+	olive::TrackViewItem item_a1(track_handle(a1));
+	olive::TrackViewItem item_s1(track_handle(s1));
+
+	auto *label_v1 = item_v1.findChild<olive::ClickableLabel *>();
+	auto *label_v2 = item_v2.findChild<olive::ClickableLabel *>();
+	auto *label_a1 = item_a1.findChild<olive::ClickableLabel *>();
+	auto *label_s1 = item_s1.findChild<olive::ClickableLabel *>();
+	ASSERT_NE(label_v1, nullptr);
+	ASSERT_NE(label_v2, nullptr);
+	ASSERT_NE(label_a1, nullptr);
+	ASSERT_NE(label_s1, nullptr);
+
+	// NLE-style prefix is 1-based (V1/V2, A1, S1) followed by the custom
+	// label or, when unset, the engine default track name
+	EXPECT_TRUE(label_v1->text().startsWith(QStringLiteral("V1  ")));
+	EXPECT_TRUE(label_v1->text().contains(QStringLiteral("Hero")));
+
+	EXPECT_TRUE(label_v2->text().startsWith(QStringLiteral("V2  ")));
+	EXPECT_FALSE(label_v2->text().contains(QStringLiteral("Hero")));
+	EXPECT_GT(label_v2->text().size(), 4);
+
+	EXPECT_TRUE(label_a1->text().startsWith(QStringLiteral("A1  ")));
+	EXPECT_TRUE(label_s1->text().startsWith(QStringLiteral("S1  ")));
+}
+
+TEST(TrackViewItem, RenameThroughLineEditRoundTrips)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	olive::Track *track = append_track(&project, sequence, olive::Track::k_video);
+
+	olive::TrackViewItem item(track_handle(track));
+	auto *stack = item.findChild<QStackedWidget *>();
+	auto *label = item.findChild<olive::ClickableLabel *>();
+	auto *edit = item.findChild<olive::FocusableLineEdit *>();
+	ASSERT_NE(stack, nullptr);
+	ASSERT_NE(label, nullptr);
+	ASSERT_NE(edit, nullptr);
+
+	// The label is the resting page of the stack
+	EXPECT_EQ(stack->currentWidget(), label);
+
+	// Double-clicking the label swaps in the line edit
+	emit label->mouse_double_clicked();
+	EXPECT_EQ(stack->currentWidget(), edit);
+
+	// Confirming writes the label to the engine and swaps back
+	edit->setText(QStringLiteral("Renamed"));
+	emit edit->confirmed();
+	EXPECT_EQ(stack->currentWidget(), label);
+	EXPECT_TRUE(label->text().contains(QStringLiteral("Renamed")));
+
+	char buf[256];
+	buf[0] = '\0';
+	oakengine_node_get_label(node_handle(track), buf, sizeof(buf));
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("Renamed"));
+
+	// Cancelling discards the edit and restores the label page
+	emit label->mouse_double_clicked();
+	EXPECT_EQ(stack->currentWidget(), edit);
+	edit->setText(QStringLiteral("Discarded"));
+	emit edit->cancelled();
+	EXPECT_EQ(stack->currentWidget(), label);
+
+	buf[0] = '\0';
+	oakengine_node_get_label(node_handle(track), buf, sizeof(buf));
+	EXPECT_EQ(QString::fromUtf8(buf), QStringLiteral("Renamed"));
+	EXPECT_TRUE(label->text().contains(QStringLiteral("Renamed")));
+}
+
+TEST(TrackViewItem, MuteAndLockButtonsDriveEngineState)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	olive::Track *track = append_track(&project, sequence, olive::Track::k_video);
+
+	olive::TrackViewItem item(track_handle(track));
+
+	// The buttons are identified by the checked color baked into their style
+	// sheets (Qt::red for mute, Qt::gray for lock); resolve the colors the
+	// same way the implementation does -- QColor(Qt::gray).name() is not the
+	// SVG "#808080" one might expect
+	QPushButton *mute = find_button_by_checked_color(
+		&item, QColor(Qt::red).name());
+	QPushButton *lock = find_button_by_checked_color(
+		&item, QColor(Qt::gray).name());
+	ASSERT_NE(mute, nullptr);
+	ASSERT_NE(lock, nullptr);
+	EXPECT_TRUE(mute->isCheckable());
+	EXPECT_TRUE(lock->isCheckable());
+	EXPECT_FALSE(mute->isChecked());
+	EXPECT_FALSE(lock->isChecked());
+
+	OakEngineSequence *seq = seq_handle(sequence);
+	EXPECT_EQ(oakengine_track_is_muted(seq, OAKENGINE_TRACK_TYPE_VIDEO, 0), 0);
+	EXPECT_EQ(oakengine_track_is_locked(seq, OAKENGINE_TRACK_TYPE_VIDEO, 0), 0);
+
+	// Clicking the button writes through to the engine track
+	mute->click();
+	EXPECT_EQ(oakengine_track_is_muted(seq, OAKENGINE_TRACK_TYPE_VIDEO, 0), 1);
+	EXPECT_TRUE(mute->isChecked());
+
+	// An external mute change reflects back on the button via the
+	// EngineEventBridge subscription
+	oakengine_track_set_muted(seq, OAKENGINE_TRACK_TYPE_VIDEO, 0, 0);
+	EXPECT_FALSE(mute->isChecked());
+
+	lock->click();
+	EXPECT_EQ(oakengine_track_is_locked(seq, OAKENGINE_TRACK_TYPE_VIDEO, 0), 1);
+	EXPECT_TRUE(lock->isChecked());
+}
+
+TEST(TrackViewItem, DeleteTrackEmitsSignalAndRemovesTrack)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+	olive::Sequence *sequence = create_sequence(&project);
+	olive::Track *track = append_track(&project, sequence, olive::Track::k_video);
+
+	// Owned by the test so the dangling engine handle after removal can't
+	// outlive the widget
+	auto *item = new olive::TrackViewItem(track_handle(track));
+
+	OakEngineTrack *received = nullptr;
+	QObject::connect(item, &olive::TrackViewItem::about_to_delete_track,
+					 [&received](OakEngineTrack *t) { received = t; });
+
+	// The context menu wires this slot with a queued connection; on the same
+	// thread a direct meta-call is equivalent and avoids the modal menu
+	QMetaObject::invokeMethod(item, "delete_track");
+
+	EXPECT_EQ(received, track_handle(track));
+
+	int video = -1, audio = -1, subtitle = -1;
+	oakengine_sequence_track_count(seq_handle(sequence), &video, &audio,
+								   &subtitle);
+	EXPECT_EQ(video, 0);
+
+	delete item;
+}
+
+TEST(TrackViewSplitter, ConstructionDefaults)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+	EXPECT_EQ(splitter.orientation(), Qt::Vertical);
+	EXPECT_EQ(splitter.handleWidth(), 1);
+	// The trailing spacer is added by the constructor
+	EXPECT_EQ(splitter.count(), 1);
+	EXPECT_EQ(splitter.height(), 0);
+
+	olive::TrackViewSplitter bottom(Qt::AlignBottom);
+	EXPECT_EQ(bottom.count(), 1);
+}
+
+TEST(TrackViewSplitter, InsertGrowsFixedHeightAndOrdersWidgets)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+
+	auto *w1 = new QWidget();
+	auto *w2 = new QWidget();
+	splitter.insert(0, 100, w1);
+
+	// Height = item height + one handle width
+	EXPECT_EQ(splitter.count(), 2);
+	EXPECT_EQ(splitter.widget(0), w1);
+	EXPECT_EQ(splitter.height(), 101);
+
+	splitter.insert(1, 50, w2);
+
+	// Height = both items + two handle widths; spacer stays last
+	EXPECT_EQ(splitter.count(), 3);
+	EXPECT_EQ(splitter.widget(0), w1);
+	EXPECT_EQ(splitter.widget(1), w2);
+	EXPECT_EQ(splitter.height(), 152);
+
+	const QList<int> sz = splitter.sizes();
+	ASSERT_EQ(sz.size(), 3);
+	EXPECT_EQ(sz.at(0), 100);
+	EXPECT_EQ(sz.at(1), 50);
+}
+
+TEST(TrackViewSplitter, InsertAlignBottomAppendsAfterSpacer)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignBottom);
+
+	auto *w1 = new QWidget();
+	auto *w2 = new QWidget();
+	splitter.insert(0, 60, w1);
+	splitter.insert(1, 40, w2);
+
+	// With bottom alignment the spacer stays at the top and later inserts
+	// land between the spacer and the existing items
+	ASSERT_EQ(splitter.count(), 3);
+	EXPECT_EQ(splitter.widget(1), w2);
+	EXPECT_EQ(splitter.widget(2), w1);
+
+	// Height = both items + two handle widths
+	EXPECT_EQ(splitter.height(), 102);
+}
+
+TEST(TrackViewSplitter, RemoveDeletesWidgetAndShrinksHeight)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+
+	auto *w1 = new QWidget();
+	auto *w2 = new QWidget();
+	splitter.insert(0, 100, w1);
+	splitter.insert(1, 50, w2);
+	ASSERT_EQ(splitter.height(), 152);
+
+	QPointer<QWidget> gone = w1;
+	splitter.remove(0);
+
+	EXPECT_TRUE(gone.isNull());
+	EXPECT_EQ(splitter.count(), 2);
+	EXPECT_EQ(splitter.widget(0), w2);
+	// Removing an item subtracts its height and one handle width
+	EXPECT_EQ(splitter.height(), 51);
+
+	const QList<int> sz = splitter.sizes();
+	ASSERT_EQ(sz.size(), 2);
+	EXPECT_EQ(sz.at(0), 50);
+}
+
+TEST(TrackViewSplitter, SetSpacerHeightGrowsTotalHeight)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+
+	auto *w1 = new QWidget();
+	splitter.insert(0, 100, w1);
+	ASSERT_EQ(splitter.height(), 101);
+
+	// The spacer keeps a handle on the trailing edge; its height is added to
+	// the fixed total
+	splitter.set_spacer_height(40);
+	EXPECT_EQ(splitter.height(), 141);
+}
+
+TEST(TrackViewSplitter, SetTrackHeightAdjustsFixedHeight)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+
+	splitter.insert(0, 100, new QWidget());
+	splitter.insert(1, 50, new QWidget());
+	ASSERT_EQ(splitter.height(), 152);
+
+	// Growing a track by 30px grows the whole splitter by 30px
+	splitter.set_track_height(0, 130);
+	EXPECT_EQ(splitter.height(), 182);
+
+	// The fixed height always moves by (new - old) for the addressed track;
+	// read the current size back instead of assuming an exact layout, since
+	// QSplitter redistributes sizes when the fixed height changes
+	const int old_size = splitter.sizes().at(1);
+	const int old_height = splitter.height();
+	splitter.set_track_height(1, 20);
+	EXPECT_EQ(splitter.height(), old_height + (20 - old_size));
+}
+
+TEST(TrackViewSplitter, HandlesAreTrackViewSplitterHandles)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+	splitter.insert(0, 100, new QWidget());
+
+	// createHandle() must produce the custom handle type
+	EXPECT_NE(qobject_cast<olive::TrackViewSplitterHandle *>(splitter.handle(1)),
+			  nullptr);
+}
+
+TEST(TrackViewSplitter, HandleReceiverResizesAndEmits)
+{
+	olive::TrackViewSplitter splitter(Qt::AlignTop);
+	splitter.insert(0, 100, new QWidget());
+	splitter.insert(1, 50, new QWidget());
+	ASSERT_EQ(splitter.height(), 152);
+
+	const QList<int> sz = splitter.sizes();
+	ASSERT_EQ(sz.size(), 3);
+	ASSERT_EQ(sz.at(0), 100);
+
+	QSignalSpy spy(&splitter, &olive::TrackViewSplitter::track_height_changed);
+
+	// Dragging the handle below the first track grows it by the drag delta
+	auto *handle =
+		qobject_cast<olive::TrackViewSplitterHandle *>(splitter.handle(1));
+	ASSERT_NE(handle, nullptr);
+	splitter.handle_receiver(handle, 30);
+
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_EQ(spy.first().at(0).toInt(), 0);
+	EXPECT_EQ(spy.first().at(1).toInt(), 130);
+	EXPECT_EQ(splitter.height(), 182);
+}

tests/gtest/widget_handles_test.cpp

@@ -0,0 +1,396 @@
+#include <gtest/gtest.h>
+
+#include <QDateTime>
+#include <QFontMetrics>
+#include <QImage>
+#include <QLabel>
+#include <QPainter>
+#include <QSignalSpy>
+#include <QTest>
+
+#include "node/block/clip/clip.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/output/track/track.h"
+#include "node/output/track/tracklist.h"
+#include "node/project.h"
+#include "node/project/sequence/sequence.h"
+#include "timeline/timelinemarker.h"
+#include "widget/playbackcontrols/dragbutton.h"
+#include "widget/taskview/elapsedcounterwidget.h"
+#include "widget/timelinewidget/cliphandle.h"
+#include "widget/timelinewidget/trackhandle.h"
+#include "widget/timeruler/markerhandle.h"
+#include "widget/timeruler/markerpainting.h"
+#include "oakutil/qtutils.h"
+
+TEST(WidgetDragButton, DefaultsAndPlainClick)
+{
+	olive::DragButton btn;
+	btn.resize(80, 30);
+	EXPECT_EQ(btn.cursor().shape(), Qt::OpenHandCursor);
+
+	QSignalSpy drag_spy(&btn, &olive::DragButton::drag_started);
+	QSignalSpy click_spy(&btn, &QPushButton::clicked);
+
+	// A plain click is still a normal button click, not a drag
+	QTest::mouseClick(&btn, Qt::LeftButton, Qt::NoModifier, QPoint(10, 10));
+	EXPECT_EQ(drag_spy.count(), 0);
+	EXPECT_EQ(click_spy.count(), 1);
+}
+
+TEST(WidgetDragButton, DragEmitsDragStartedOncePerPress)
+{
+	olive::DragButton btn;
+	btn.resize(80, 30);
+
+	QSignalSpy drag_spy(&btn, &olive::DragButton::drag_started);
+
+	// Press then move: the first move with a button held starts the drag
+	QTest::mousePress(&btn, Qt::LeftButton, Qt::NoModifier, QPoint(10, 10));
+	QTest::mouseMove(&btn, QPoint(20, 15));
+	ASSERT_EQ(drag_spy.count(), 1);
+
+	// The drag state latches until release
+	QTest::mouseMove(&btn, QPoint(30, 20));
+	EXPECT_EQ(drag_spy.count(), 1);
+	QTest::mouseRelease(&btn, Qt::LeftButton, Qt::NoModifier, QPoint(30, 20));
+
+	// A new press re-arms the drag detection
+	QTest::mousePress(&btn, Qt::LeftButton, Qt::NoModifier, QPoint(10, 10));
+	QTest::mouseMove(&btn, QPoint(25, 15));
+	EXPECT_EQ(drag_spy.count(), 2);
+	QTest::mouseRelease(&btn, Qt::LeftButton, Qt::NoModifier, QPoint(25, 15));
+}
+
+TEST(WidgetDragButton, MoveWithoutButtonsDoesNotEmit)
+{
+	olive::DragButton btn;
+	btn.resize(80, 30);
+
+	QSignalSpy drag_spy(&btn, &olive::DragButton::drag_started);
+
+	QTest::mouseMove(&btn, QPoint(40, 15));
+	EXPECT_EQ(drag_spy.count(), 0);
+}
+
+TEST(WidgetElapsedCounter, InitialLabelsAreZero)
+{
+	olive::ElapsedCounterWidget w;
+	const auto labels = w.findChildren<QLabel *>();
+	ASSERT_EQ(labels.size(), 2);
+
+	EXPECT_EQ(labels.at(0)->text(), QStringLiteral("Elapsed: 00:00:00"));
+	EXPECT_EQ(labels.at(1)->text(), QStringLiteral("Remaining: 00:00:00"));
+}
+
+TEST(WidgetElapsedCounter, HalfProgressMakesElapsedEqualRemaining)
+{
+	olive::ElapsedCounterWidget w;
+	const auto labels = w.findChildren<QLabel *>();
+	ASSERT_EQ(labels.size(), 2);
+
+	// At 50% progress, remaining time is derived from the same elapsed
+	// value, so both labels must agree regardless of wall-clock drift
+	w.start(QDateTime::currentMSecsSinceEpoch() - 60000);
+	w.set_progress(0.5);
+
+	const QString elapsed = labels.at(0)->text();
+	const QString remaining = labels.at(1)->text();
+	EXPECT_NE(elapsed, QStringLiteral("Elapsed: 00:00:00"));
+	EXPECT_EQ(elapsed, QStringLiteral("Elapsed: ") +
+							remaining.mid(QStringLiteral("Remaining: ").size()));
+
+	// A full progress report leaves nothing remaining
+	w.set_progress(1.0);
+	EXPECT_EQ(labels.at(1)->text(), QStringLiteral("Remaining: 00:00:00"));
+
+	w.stop();
+}
+
+TEST(WidgetElapsedCounter, ZeroProgressResetsLabels)
+{
+	olive::ElapsedCounterWidget w;
+	const auto labels = w.findChildren<QLabel *>();
+	ASSERT_EQ(labels.size(), 2);
+
+	w.start(QDateTime::currentMSecsSinceEpoch() - 60000);
+	w.set_progress(0.5);
+	EXPECT_NE(labels.at(0)->text(), QStringLiteral("Elapsed: 00:00:00"));
+
+	// No progress means no estimate at all
+	w.set_progress(0.0);
+	EXPECT_EQ(labels.at(0)->text(), QStringLiteral("Elapsed: 00:00:00"));
+	EXPECT_EQ(labels.at(1)->text(), QStringLiteral("Remaining: 00:00:00"));
+
+	w.stop();
+}
+
+TEST(WidgetClipHandle, EmptyClipDefaults)
+{
+	OakEngineBlock *clip = olive::clip_create_empty("Test Clip");
+	ASSERT_NE(clip, nullptr);
+
+	EXPECT_EQ(olive::cliphandle(clip),
+			  reinterpret_cast<OakEngineClip *>(clip));
+	EXPECT_DOUBLE_EQ(olive::clip_speed(clip), 1.0);
+	EXPECT_EQ(olive::clip_loop_mode(clip), 0);
+	EXPECT_FALSE(olive::clip_is_reversed(clip));
+	EXPECT_FALSE(olive::clip_maintain_audio_pitch(clip));
+	EXPECT_FALSE(olive::clip_is_autocaching(clip));
+
+	// Nothing is connected to the buffer input and the clip is on no track
+	EXPECT_EQ(olive::clip_connected_node(clip), nullptr);
+	EXPECT_EQ(olive::clip_thumbnails(clip), nullptr);
+	EXPECT_EQ(olive::clip_waveform(clip), nullptr);
+	EXPECT_EQ(olive::clip_connected_video_cache(clip), nullptr);
+	EXPECT_EQ(olive::block_track_handle(clip), nullptr);
+
+	EXPECT_EQ(olive::clip_media_in(clip), olive::Rational(0));
+	const olive::TimeRange range = olive::clip_media_range(clip);
+	EXPECT_EQ(range.in(), olive::Rational(0));
+	EXPECT_EQ(range.out(), olive::Rational(0));
+
+	// Invalidation requests with nothing connected are a safe no-op
+	olive::clip_request_invalidate_connected(clip);
+
+	delete reinterpret_cast<olive::ClipBlock *>(clip);
+}
+
+TEST(WidgetClipHandle, SetMediaInRoundTripsThroughFacade)
+{
+	OakEngineBlock *clip = olive::clip_create_empty(nullptr);
+	ASSERT_NE(clip, nullptr);
+
+	olive::clip_set_media_in(clip, olive::Rational(2, 1));
+	EXPECT_EQ(olive::clip_media_in(clip), olive::Rational(2, 1));
+
+	// Media out is media in plus the clip's (zero) length
+	const olive::TimeRange range = olive::clip_media_range(clip);
+	EXPECT_EQ(range.in(), olive::Rational(2, 1));
+	EXPECT_EQ(range.out(), olive::Rational(2, 1));
+
+	delete reinterpret_cast<olive::ClipBlock *>(clip);
+}
+
+TEST(WidgetClipHandle, NullClipIsTolerated)
+{
+	olive::clip_set_media_in(nullptr, olive::Rational(1, 1));
+	olive::clip_request_invalidate_connected(nullptr);
+	olive::clip_request_invalidate_connected(
+		nullptr, true,
+		olive::TimeRange(olive::Rational(0, 1), olive::Rational(1, 1)));
+	SUCCEED();
+}
+
+TEST(WidgetTrackHandle, NullTrackIsTolerated)
+{
+	EXPECT_EQ(olive::trackhandle(nullptr), nullptr);
+	EXPECT_EQ(olive::track_sequence_handle(nullptr), nullptr);
+	EXPECT_EQ(olive::track_type_of(nullptr), -1);
+	EXPECT_EQ(olive::track_index_of(nullptr), -1);
+	EXPECT_FALSE(olive::track_is_locked(nullptr));
+	EXPECT_FALSE(olive::track_is_muted(nullptr));
+}
+
+TEST(WidgetTrackHandle, ConnectedTrackReportsSequenceIndexAndFlags)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+	project.initialize();
+
+	auto *sequence = new olive::Sequence();
+	sequence->setParent(&project);
+	sequence->add_default_nodes();
+
+	olive::TrackList *video = sequence->track_list(olive::Track::k_video);
+	olive::TrackList *audio = sequence->track_list(olive::Track::k_audio);
+	ASSERT_EQ(video->get_track_count(), 1);
+	ASSERT_EQ(audio->get_track_count(), 1);
+
+	olive::Track *video_track = video->get_track_at(0);
+	auto *h = reinterpret_cast<OakEngineTrack *>(video_track);
+
+	EXPECT_EQ(olive::trackhandle(h), h);
+	EXPECT_EQ(olive::track_type_of(h), OAKENGINE_TRACK_TYPE_VIDEO);
+	EXPECT_EQ(olive::track_index_of(h), 0);
+	EXPECT_EQ(olive::track_sequence_handle(h),
+			  reinterpret_cast<OakEngineSequence *>(sequence));
+
+	EXPECT_FALSE(olive::track_is_locked(h));
+	EXPECT_FALSE(olive::track_is_muted(h));
+
+	video_track->set_locked(true);
+	EXPECT_TRUE(olive::track_is_locked(h));
+
+	video_track->set_muted(true);
+	EXPECT_TRUE(olive::track_is_muted(h));
+
+	// Lock/mute are per-track; the audio track is unaffected
+	auto *ah = reinterpret_cast<OakEngineTrack *>(audio->get_track_at(0));
+	EXPECT_EQ(olive::track_type_of(ah), OAKENGINE_TRACK_TYPE_AUDIO);
+	EXPECT_FALSE(olive::track_is_locked(ah));
+	EXPECT_FALSE(olive::track_is_muted(ah));
+}
+
+TEST(WidgetMarkerHandle, DetachedMarkerAccessors)
+{
+	OakEngineMarker *m = oakengine_marker_create(3, 5, 1, 8, 1, "Intro");
+	ASSERT_NE(m, nullptr);
+
+	const olive::TimeRange t = olive::marker_time(m);
+	EXPECT_EQ(t.in(), olive::Rational(5, 1));
+	EXPECT_EQ(t.out(), olive::Rational(8, 1));
+	EXPECT_EQ(olive::marker_name(m), QStringLiteral("Intro"));
+	EXPECT_EQ(olive::marker_color(m), 3);
+
+	// ADL customization points used by the selection manager
+	EXPECT_EQ(olive::selection_time(m), olive::Rational(5, 1));
+	EXPECT_EQ(olive::selection_time_end(m), olive::Rational(8, 1));
+	EXPECT_EQ(olive::selection_time_target_parent(m), nullptr);
+
+	oakengine_marker_free(m);
+}
+
+TEST(WidgetMarkerHandle, SetTimeLiveUpdatesRange)
+{
+	OakEngineMarker *m = oakengine_marker_create(0, 5, 1, 8, 1, "M");
+	ASSERT_NE(m, nullptr);
+
+	olive::marker_set_time_live(
+		m, olive::TimeRange(olive::Rational(1, 1), olive::Rational(2, 1)));
+
+	const olive::TimeRange t = olive::marker_time(m);
+	EXPECT_EQ(t.in(), olive::Rational(1, 1));
+	EXPECT_EQ(t.out(), olive::Rational(2, 1));
+
+	oakengine_marker_free(m);
+}
+
+TEST(WidgetMarkerHandle, SelectionSetTimePreservesLength)
+{
+	OakEngineMarker *m = oakengine_marker_create(0, 5, 1, 8, 1, nullptr);
+	ASSERT_NE(m, nullptr);
+
+	// Moving the in-point drags the out-point along, keeping a length of 3
+	olive::selection_set_time(m, olive::Rational(10, 1));
+
+	const olive::TimeRange t = olive::marker_time(m);
+	EXPECT_EQ(t.in(), olive::Rational(10, 1));
+	EXPECT_EQ(t.out(), olive::Rational(13, 1));
+
+	oakengine_marker_free(m);
+}
+
+TEST(WidgetMarkerHandle, SiblingDetectionWithinList)
+{
+	// The list asserts that in-points are unique, so use distinct times
+	olive::TimelineMarkerList list;
+	olive::TimelineMarker a(
+		1,
+		olive::core::TimeRange(olive::core::Rational(5, 1),
+							   olive::core::Rational(5, 1)),
+		QStringLiteral("A"), &list);
+	olive::TimelineMarker b(
+		2,
+		olive::core::TimeRange(olive::core::Rational(7, 1),
+							   olive::core::Rational(7, 1)),
+		QStringLiteral("B"), &list);
+	olive::TimelineMarker c(
+		3,
+		olive::core::TimeRange(olive::core::Rational(9, 1),
+							   olive::core::Rational(9, 1)),
+		QStringLiteral("C"), &list);
+	ASSERT_EQ(list.size(), 3);
+
+	auto *hc = reinterpret_cast<OakEngineMarker *>(&c);
+
+	// Another marker sits at t=5, so c has a sibling there
+	EXPECT_TRUE(olive::marker_has_sibling_at_time(hc, olive::Rational(5, 1)));
+
+	// c is the only marker at t=9; a marker is not its own sibling
+	EXPECT_FALSE(olive::marker_has_sibling_at_time(hc, olive::Rational(9, 1)));
+
+	// No marker at all at t=11
+	EXPECT_FALSE(olive::marker_has_sibling_at_time(hc, olive::Rational(11, 1)));
+}
+
+TEST(WidgetMarkerPainting, HeightMatchesFontMetrics)
+{
+	QImage img(200, 100, QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	QPainter p(&img);
+
+	EXPECT_EQ(olive::MarkerPainting::height(p.fontMetrics()),
+			  p.fontMetrics().height());
+}
+
+TEST(WidgetMarkerPainting, PointMarkerGeometryAndFill)
+{
+	QImage img(200, 100, QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	QPainter p(&img);
+
+	const QFontMetrics fm = p.fontMetrics();
+	const int h = olive::MarkerPainting::height(fm);
+	const int w = olive::QtUtils::q_font_metrics_width(fm, QStringLiteral("H"));
+
+	const QPoint pt(100, 90);
+	const QRect r = olive::MarkerPainting::draw(&p, pt, -1, 10.0, false,
+												QString(), 0,
+												olive::Rational(2, 1),
+												olive::Rational(2, 1));
+	p.end();
+
+	// A point marker (in == out) is centered horizontally on the anchor and
+	// sits one marker-height above it
+	EXPECT_EQ(r, QRect(pt.x() - w / 2, pt.y() - h, w, h));
+
+	// The polygon body is filled around its center
+	const QColor px = img.pixelColor(QPoint(pt.x(), pt.y() - h / 2));
+	EXPECT_GT(px.alpha(), 0);
+}
+
+TEST(WidgetMarkerPainting, RangedMarkerGeometryScalesWithRange)
+{
+	QImage img(400, 100, QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	QPainter p(&img);
+
+	const QFontMetrics fm = p.fontMetrics();
+	const int h = olive::MarkerPainting::height(fm);
+
+	const QPoint pt(50, 90);
+	const QRect r = olive::MarkerPainting::draw(&p, pt, -1, 10.0, false,
+												QStringLiteral("Span"), 0,
+												olive::Rational(2, 1),
+												olive::Rational(5, 1));
+	p.end();
+
+	// A ranged marker starts at the anchor and extends (out - in) * scale px
+	EXPECT_EQ(r, QRect(pt.x(), pt.y() - h, 30, h));
+
+	// The rect body is filled
+	const QColor px = img.pixelColor(QPoint(pt.x() + 2, pt.y() - h / 2));
+	EXPECT_GT(px.alpha(), 0);
+}
+
+TEST(WidgetMarkerPainting, SelectionAndLabelDoNotAffectGeometry)
+{
+	QImage img(400, 100, QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	QPainter p(&img);
+
+	const QPoint pt(100, 90);
+
+	const QRect plain = olive::MarkerPainting::draw(
+		&p, pt, -1, 10.0, false, QString(), 0, olive::Rational(2, 1),
+		olive::Rational(2, 1));
+
+	// Selected + a label to the right of the marker
+	const QRect selected = olive::MarkerPainting::draw(
+		&p, pt, 300, 10.0, true, QStringLiteral("Named"), 0,
+		olive::Rational(2, 1), olive::Rational(2, 1));
+	p.end();
+
+	EXPECT_EQ(plain, selected);
+}

tests/gtest/widget_keyframe_multicam_test.cpp

@@ -0,0 +1,660 @@
+#include <gtest/gtest.h>
+
+#include <cstring>
+#include <memory>
+
+#include <QApplication>
+#include <QDialogButtonBox>
+#include <QEvent>
+#include <QPushButton>
+#include <QSignalSpy>
+#include <QTreeWidget>
+
+#include <olive/core/render/audioparams.h>
+#include <olive/core/render/samplebuffer.h>
+
+#include "core.h"
+#include "dialog/configbase/configdialogbasetab.h"
+#include "dialog/otioproperties/otiopropertiesdialog.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/factory.h"
+#include "node/input/multicam/multicamnode.h"
+#include "node/keyframe.h"
+#include "node/math/math/math.h"
+#include "node/nodeundo.h"
+#include "node/project.h"
+#include "node/project/sequence/sequence.h"
+#include "oakengine/node.h"
+#include "render/diskmanager.h"
+#include "widget/audiomonitor/audiomonitor.h"
+#include "widget/keyframeview/keyframehandle.h"
+#include "widget/keyframeview/keyframeview.h"
+#include "widget/keyframeview/keyframeviewinputconnection.h"
+#include "widget/multicam/multicamdisplay.h"
+#include "widget/nodecombobox/nodecombobox.h"
+
+using namespace olive;
+
+namespace
+{
+
+// Keyframe views and the facade event subscriptions need the application
+// singletons; create them once and leak them (same pattern as the other
+// widget suites)
+void ensure_app_singletons()
+{
+	if (!olive::Core::instance()) {
+		new olive::Core(); // intentionally leaked
+	}
+	if (!olive::DiskManager::instance()) {
+		olive::DiskManager::create_instance();
+	}
+}
+
+NodeKeyframe *insert_keyframe(Node *node, const QString &input,
+							  const Rational &time, const QVariant &value,
+							  int track = 0)
+{
+	auto *key =
+		new NodeKeyframe(time, value, NodeKeyframe::k_linear, track, -1, input);
+	NodeParamInsertKeyframeCommand(node, key).redo_now();
+	return key;
+}
+
+oak::KeyframeTrackRef track_ref(Node *n, const QString &input, int track)
+{
+	return oak::KeyframeTrackRef(
+		oak::Input(reinterpret_cast<OakEngineNode *>(n), input), track);
+}
+
+OakEngineKeyframe *handle_of(NodeKeyframe *key)
+{
+	return reinterpret_cast<OakEngineKeyframe *>(key);
+}
+
+// Minimal concrete tab: the base class only provides a default validate()
+class RecordingTab : public olive::ConfigDialogBaseTab {
+public:
+	virtual void accept(void *parent) override
+	{
+		accepted_with = parent;
+	}
+
+	void *accepted_with = nullptr;
+};
+
+} // namespace
+
+//
+// keyframehandle.h: facade accessors over OakEngineKeyframe identity handles
+//
+class KeyframeHandleTest : public ::testing::Test {
+protected:
+	void SetUp() override
+	{
+		ColorManager::set_up_default_config();
+		ensure_app_singletons();
+
+		project_ = std::make_unique<Project>();
+		project_->initialize();
+
+		node_ = new MathNode();
+		node_->setParent(project_.get());
+	}
+
+	std::unique_ptr<Project> project_;
+	MathNode *node_ = nullptr;
+};
+
+TEST_F(KeyframeHandleTest, AccessorsReadEngineState)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(1, 2), 2.5);
+	const OakEngineKeyframe *handle = handle_of(key);
+
+	EXPECT_EQ(key_node(handle), reinterpret_cast<OakEngineNode *>(node_));
+	EXPECT_EQ(key_time(handle), Rational(1, 2));
+	EXPECT_EQ(key_easing(handle), 0); // facade order: 0 = linear
+	EXPECT_EQ(key_input_id(handle), MathNode::k_param_a_in);
+	EXPECT_EQ(key_track(handle), 0);
+	EXPECT_EQ(key_element(handle), -1);
+}
+
+TEST_F(KeyframeHandleTest, ValueAsDoubleConvertsNumericTypes)
+{
+	NodeKeyframe *float_key = insert_keyframe(node_, MathNode::k_param_a_in,
+										  Rational(0), 2.5);
+	const oak_node_value float_value = key_value(handle_of(float_key));
+	EXPECT_EQ(float_value.type, OAK_NODE_VALUE_FLOAT);
+	EXPECT_DOUBLE_EQ(key_value_as_double(handle_of(float_key)), 2.5);
+
+	// The base-class enabled input carries boolean keyframes
+	NodeKeyframe *bool_key = insert_keyframe(node_, Node::k_enabled_input,
+										 Rational(0), true);
+	const oak_node_value bool_value = key_value(handle_of(bool_key));
+	EXPECT_EQ(bool_value.type, OAK_NODE_VALUE_BOOL);
+	EXPECT_DOUBLE_EQ(key_value_as_double(handle_of(bool_key)), 1.0);
+
+	NodeKeyframe *false_key = insert_keyframe(node_, Node::k_enabled_input,
+										  Rational(1), false);
+	EXPECT_DOUBLE_EQ(key_value_as_double(handle_of(false_key)), 0.0);
+}
+
+TEST_F(KeyframeHandleTest, LiveValueSetUpdatesFacadeReads)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 1.0);
+
+	oak_node_value v;
+	std::memset(&v, 0, sizeof(v));
+	v.type = OAK_NODE_VALUE_FLOAT;
+	v.f[0] = 7.25;
+	key_set_value_live(handle_of(key), v);
+
+	EXPECT_DOUBLE_EQ(key_value_as_double(handle_of(key)), 7.25);
+	EXPECT_DOUBLE_EQ(key->value().toDouble(), 7.25);
+}
+
+TEST_F(KeyframeHandleTest, LiveTimeSetMovesKeyframe)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 0.0);
+
+	key_set_time_live(handle_of(key), Rational(2));
+	EXPECT_EQ(key_time(handle_of(key)), Rational(2));
+	EXPECT_EQ(key->time(), Rational(2));
+
+	// The selection ADL wrappers route through the same accessors
+	EXPECT_EQ(selection_time(handle_of(key)), Rational(2));
+	selection_set_time(handle_of(key), Rational(4));
+	EXPECT_EQ(key->time(), Rational(4));
+}
+
+TEST_F(KeyframeHandleTest, BezierPointRoundTrip)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 0.0);
+	key->set_type(NodeKeyframe::k_bezier);
+	ASSERT_EQ(key_easing(handle_of(key)), 1); // facade order: 1 = bezier
+
+	key_set_bezier_point_live(handle_of(key), 0, QPointF(0.25, 0.75));
+	key_set_bezier_point_live(handle_of(key), 1, QPointF(-0.5, 1.5));
+
+	EXPECT_EQ(key_bezier_point(handle_of(key), 0), QPointF(0.25, 0.75));
+	EXPECT_EQ(key_bezier_point(handle_of(key), 1), QPointF(-0.5, 1.5));
+
+	// For a bezier keyframe the "valid" points are the actual points
+	EXPECT_EQ(key_valid_bezier_point(handle_of(key), 0), QPointF(0.25, 0.75));
+	EXPECT_EQ(key_valid_bezier_point(handle_of(key), 1), QPointF(-0.5, 1.5));
+}
+
+TEST_F(KeyframeHandleTest, HasSiblingAtTimeExcludesSelf)
+{
+	// The sibling lookup goes through Node::get_keyframe_at_time_on_track(),
+	// which only searches tracks that are not on the standard value, so
+	// keyframing must be enabled on the input first
+	node_->set_input_is_keyframing(MathNode::k_param_a_in, true);
+
+	NodeKeyframe *key_a = insert_keyframe(node_, MathNode::k_param_a_in,
+										  Rational(0), 0.0);
+	NodeKeyframe *key_b = insert_keyframe(node_, MathNode::k_param_a_in,
+										  Rational(1), 1.0);
+
+	// Another keyframe sits at t=1
+	EXPECT_TRUE(key_has_sibling_at_time(handle_of(key_a), Rational(1)));
+	// t=0 resolves to key_a itself, which does not count as a sibling
+	EXPECT_FALSE(key_has_sibling_at_time(handle_of(key_a), Rational(0)));
+	// Nothing at t=5
+	EXPECT_FALSE(key_has_sibling_at_time(handle_of(key_a), Rational(5)));
+
+	EXPECT_TRUE(selection_has_sibling_at_time(handle_of(key_b), Rational(0)));
+	EXPECT_EQ(selection_time_target_parent(handle_of(key_a)),
+			  reinterpret_cast<OakEngineNode *>(node_));
+}
+
+//
+// keyframeviewinputconnection.h: per-track connection between engine keyframe
+// events and a KeyframeView
+//
+class KeyframeConnectionTest : public ::testing::Test {
+protected:
+	void SetUp() override
+	{
+		ColorManager::set_up_default_config();
+		ensure_app_singletons();
+
+		project_ = std::make_unique<Project>();
+		project_->initialize();
+
+		node_ = new MathNode();
+		node_->setParent(project_.get());
+	}
+
+	oak::KeyframeTrackRef param_a_ref() const
+	{
+		return track_ref(node_, MathNode::k_param_a_in, 0);
+	}
+
+	std::unique_ptr<Project> project_;
+	MathNode *node_ = nullptr;
+};
+
+TEST_F(KeyframeConnectionTest, DefaultsAndAccessors)
+{
+	KeyframeView view;
+	const oak::KeyframeTrackRef ref = param_a_ref();
+	KeyframeViewInputConnection connection(ref, &view);
+
+	EXPECT_EQ(connection.get_keyframe_y(), 0);
+	EXPECT_EQ(connection.get_brush().color(), QColor(Qt::white));
+	EXPECT_EQ(connection.get_reference(), ref);
+	EXPECT_TRUE(connection.get_keyframes().isEmpty());
+}
+
+TEST_F(KeyframeConnectionTest, SetKeyframeYEmitsOnlyOnChange)
+{
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	connection.set_keyframe_y(10);
+	EXPECT_EQ(connection.get_keyframe_y(), 10);
+	EXPECT_EQ(spy.count(), 1);
+
+	// Same value is a no-op
+	connection.set_keyframe_y(10);
+	EXPECT_EQ(spy.count(), 1);
+
+	connection.set_keyframe_y(-3);
+	EXPECT_EQ(connection.get_keyframe_y(), -3);
+	EXPECT_EQ(spy.count(), 2);
+}
+
+TEST_F(KeyframeConnectionTest, SetBrushEmitsOnlyOnChange)
+{
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	// Same as the default brush: no emission
+	connection.set_brush(QBrush(Qt::white));
+	EXPECT_EQ(spy.count(), 0);
+
+	connection.set_brush(QBrush(Qt::red));
+	EXPECT_EQ(connection.get_brush().color(), QColor(Qt::red));
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST_F(KeyframeConnectionTest, SetYBehaviorEmitsOnlyOnChange)
+{
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	// Default behavior is k_single_row
+	connection.set_y_behavior(KeyframeViewInputConnection::k_single_row);
+	EXPECT_EQ(spy.count(), 0);
+
+	connection.set_y_behavior(KeyframeViewInputConnection::k_value_is_height);
+	EXPECT_EQ(spy.count(), 1);
+
+	connection.set_y_behavior(KeyframeViewInputConnection::k_value_is_height);
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST_F(KeyframeConnectionTest, MatchingKeyframeInsertionEmitsRequireUpdate)
+{
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	insert_keyframe(node_, MathNode::k_param_a_in, Rational(0), 0.0);
+	EXPECT_EQ(spy.count(), 1);
+	ASSERT_EQ(connection.get_keyframes().size(), 1);
+
+	// A keyframe on a different input of the same node does not match
+	insert_keyframe(node_, MathNode::k_param_b_in, Rational(0), 0.0);
+	EXPECT_EQ(spy.count(), 1);
+	EXPECT_EQ(connection.get_keyframes().size(), 1);
+}
+
+TEST_F(KeyframeConnectionTest, LiveValueAndTimeChangesEmitRequireUpdate)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 0.0);
+
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	oak_node_value v;
+	std::memset(&v, 0, sizeof(v));
+	v.type = OAK_NODE_VALUE_FLOAT;
+	v.f[0] = 3.0;
+	key_set_value_live(handle_of(key), v);
+	EXPECT_EQ(spy.count(), 1);
+
+	key_set_time_live(handle_of(key), Rational(3));
+	EXPECT_EQ(spy.count(), 2);
+}
+
+TEST_F(KeyframeConnectionTest, TypeChangeEmitsTypeChangedAndRequireUpdate)
+{
+	// Node::invalidate_from_keyframe_type_changed() returns early when the
+	// track holds a single keyframe (interpolation is a no-op), so the type
+	// change signal only reaches the connection with two or more keyframes
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 0.0);
+	insert_keyframe(node_, MathNode::k_param_a_in, Rational(1), 1.0);
+
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy update_spy(&connection,
+						  &KeyframeViewInputConnection::require_update);
+	QSignalSpy type_spy(&connection,
+						&KeyframeViewInputConnection::type_changed);
+
+	key->set_type(NodeKeyframe::k_hold);
+	EXPECT_EQ(update_spy.count(), 1);
+	EXPECT_EQ(type_spy.count(), 1);
+
+	// Setting the same type again emits nothing
+	key->set_type(NodeKeyframe::k_hold);
+	EXPECT_EQ(update_spy.count(), 1);
+	EXPECT_EQ(type_spy.count(), 1);
+}
+
+TEST_F(KeyframeConnectionTest, RemovalEmitsRequireUpdate)
+{
+	NodeKeyframe *key = insert_keyframe(node_, MathNode::k_param_a_in,
+										Rational(0), 0.0);
+
+	KeyframeView view;
+	KeyframeViewInputConnection connection(param_a_ref(), &view);
+	QSignalSpy spy(&connection, &KeyframeViewInputConnection::require_update);
+
+	NodeParamRemoveKeyframeCommand(key).redo_now();
+	EXPECT_EQ(spy.count(), 1);
+	EXPECT_TRUE(connection.get_keyframes().isEmpty());
+}
+
+//
+// multicamdisplay.h: the shader/paint paths need a GL renderer, but the
+// widget itself constructs offscreen and its node contract is facade-readable
+//
+TEST(WidgetMulticamDisplay, ConstructsWithoutNode)
+{
+	ensure_app_singletons();
+
+	MulticamDisplay display;
+	EXPECT_FALSE(display.isVisible());
+
+	// Accepts (and clears) a null node without touching the paint path
+	display.set_multicam_node(nullptr);
+}
+
+TEST(WidgetMulticamDisplay, MulticamNodeStateMatchesPaintContract)
+{
+	ensure_app_singletons();
+
+	MulticamDisplay display;
+
+	MultiCamNode node;
+	node.input_array_resize(MultiCamNode::k_sources_input, 3);
+	node.set_standard_value(MultiCamNode::k_current_input, 1);
+
+	auto *handle = reinterpret_cast<OakEngineNode *>(&node);
+	display.set_multicam_node(handle);
+
+	// on_paint() lays the highlight rect out from exactly these facade reads
+	EXPECT_EQ(oakengine_multicam_get_source_count(handle), 3);
+	EXPECT_EQ(oakengine_multicam_get_current_source(handle), 1);
+
+	int rows = 0, cols = 0;
+	oakengine_multicam_get_rows_and_columns(3, &rows, &cols);
+	EXPECT_EQ(rows, 2);
+	EXPECT_EQ(cols, 2);
+
+	int row = -1, col = -1;
+	oakengine_multicam_index_to_row_cols(1, rows, cols, &row, &col);
+	EXPECT_EQ(row, 0);
+	EXPECT_EQ(col, 1);
+
+	display.set_multicam_node(nullptr);
+}
+
+//
+// nodecombobox.h: the popup path is modal; the retranslation and factory-name
+// paths are not (selection round-trips are covered in widget_combos_test.cpp)
+//
+TEST(WidgetNodeComboBox, LanguageChangeRetranslatesSelection)
+{
+	NodeFactory::initialize();
+
+	{
+		NodeComboBox combo;
+		const QString id = QStringLiteral("org.olivevideoeditor.Olive.math");
+		combo.set_node(id);
+		ASSERT_EQ(combo.count(), 1);
+		const QString before = combo.itemText(0);
+		EXPECT_EQ(before, NodeFactory::get_name_from_id(id));
+		ASSERT_FALSE(before.isEmpty());
+
+		QEvent lang(QEvent::LanguageChange);
+		QApplication::sendEvent(&combo, &lang);
+
+		// The selection survives and the label is re-fetched from the factory
+		EXPECT_EQ(combo.get_selected_node(), id);
+		ASSERT_EQ(combo.count(), 1);
+		EXPECT_EQ(combo.itemText(0), before);
+	}
+
+	NodeFactory::destroy();
+}
+
+TEST(WidgetNodeComboBox, UnknownIdProducesEmptyText)
+{
+	NodeFactory::initialize();
+
+	{
+		NodeComboBox combo;
+		combo.set_node(QStringLiteral("org.example.bogus"));
+
+		// The id is stored even though the factory has no name for it
+		EXPECT_EQ(combo.get_selected_node(), QStringLiteral("org.example.bogus"));
+		ASSERT_EQ(combo.count(), 1);
+		EXPECT_TRUE(combo.itemText(0).isEmpty());
+	}
+
+	NodeFactory::destroy();
+}
+
+//
+// audiomonitor.h: painting needs a GL context; the playback state machine,
+// parameter handling and the static instance broadcasters do not
+//
+TEST(WidgetAudioMonitor, ConstructionDefaults)
+{
+	AudioMonitor monitor;
+
+	EXPECT_FALSE(monitor.is_playing());
+	// The ctor sizes the minimum width to the font height
+	EXPECT_EQ(monitor.minimumWidth(), monitor.fontMetrics().height());
+}
+
+TEST(WidgetAudioMonitor, StartWaveformWithNullCacheStaysStopped)
+{
+	AudioMonitor monitor;
+
+	// A null cache reports sample rate 0, so the start request is rejected
+	monitor.start_waveform(nullptr, Rational(0), 1);
+	EXPECT_FALSE(monitor.is_playing());
+
+	monitor.stop();
+	EXPECT_FALSE(monitor.is_playing());
+}
+
+TEST(WidgetAudioMonitor, PushSampleBufferWithoutParamsIsIgnored)
+{
+	AudioMonitor monitor;
+
+	// No params set -> channel_count() is 0 -> early return
+	monitor.push_sample_buffer(SampleBuffer());
+	EXPECT_FALSE(monitor.is_playing());
+}
+
+TEST(WidgetAudioMonitor, PushSampleBufferWithParamsDoesNotStartPlayback)
+{
+	const olive::core::AudioParams params(48000,
+										  olive::core::k_channel_layout_stereo,
+										  olive::core::SampleFormat::f32_p);
+
+	AudioMonitor monitor;
+	monitor.set_params(params);
+
+	SampleBuffer buffer(params, size_t(64));
+	ASSERT_TRUE(buffer.is_allocated());
+	float *left = buffer.data(0);
+	ASSERT_NE(left, nullptr);
+	for (int i = 0; i < 64; i++) {
+		left[i] = 0.5f;
+	}
+
+	// Level analysis runs, but sample playback is not waveform playback
+	monitor.push_sample_buffer(buffer);
+	EXPECT_FALSE(monitor.is_playing());
+
+	monitor.stop();
+	EXPECT_FALSE(monitor.is_playing());
+}
+
+TEST(WidgetAudioMonitor, StaticBroadcastsReachAllInstances)
+{
+	const olive::core::AudioParams params(48000,
+										  olive::core::k_channel_layout_stereo,
+										  olive::core::SampleFormat::f32_p);
+
+	AudioMonitor first;
+	AudioMonitor second;
+	first.set_params(params);
+	second.set_params(params);
+
+	// A null waveform is rejected on every registered instance
+	AudioMonitor::start_waveform_on_all(nullptr, Rational(0), 1);
+	EXPECT_FALSE(first.is_playing());
+	EXPECT_FALSE(second.is_playing());
+
+	SampleBuffer buffer(params, size_t(32));
+	AudioMonitor::push_sample_buffer_on_all(buffer);
+	EXPECT_FALSE(first.is_playing());
+	EXPECT_FALSE(second.is_playing());
+
+	AudioMonitor::stop_on_all();
+	EXPECT_FALSE(first.is_playing());
+	EXPECT_FALSE(second.is_playing());
+}
+
+//
+// configdialogbasetab.h
+//
+TEST(DialogConfigBaseTab, DefaultValidateAccepts)
+{
+	RecordingTab tab;
+	EXPECT_TRUE(tab.validate());
+}
+
+TEST(DialogConfigBaseTab, AcceptReceivesParentPointer)
+{
+	RecordingTab tab;
+	int parent_token = 0;
+
+	tab.accept(&parent_token);
+	EXPECT_EQ(tab.accepted_with, static_cast<void *>(&parent_token));
+}
+
+//
+// otiopropertiesdialog.h: the per-sequence Settings button opens a modal
+// SequenceDialog (not exercised); construction, listing and OK/Cancel are not
+// modal
+//
+TEST(DialogOTIOProperties, ListsSequencesWithIndexedSettingsButtons)
+{
+	ColorManager::set_up_default_config();
+
+	Project project;
+	project.initialize();
+
+	auto *seq_a = new Sequence();
+	seq_a->setParent(&project);
+	seq_a->set_label(QStringLiteral("Alpha"));
+	auto *seq_b = new Sequence();
+	seq_b->setParent(&project);
+	seq_b->set_label(QStringLiteral("Beta"));
+
+	const QList<OakEngineSequence *> sequences = {
+		reinterpret_cast<OakEngineSequence *>(seq_a),
+		reinterpret_cast<OakEngineSequence *>(seq_b),
+	};
+
+	OTIOPropertiesDialog dialog(
+		sequences, reinterpret_cast<OakEngineProject *>(&project));
+
+	EXPECT_EQ(dialog.windowTitle(), QStringLiteral("Load OpenTimelineIO Project"));
+
+	auto *table = dialog.findChild<QTreeWidget *>();
+	ASSERT_NE(table, nullptr);
+	EXPECT_EQ(table->columnCount(), 2);
+	EXPECT_EQ(table->headerItem()->text(0), QStringLiteral("Sequence"));
+	EXPECT_EQ(table->headerItem()->text(1), QStringLiteral("Actions"));
+	EXPECT_FALSE(table->rootIsDecorated());
+
+	ASSERT_EQ(table->topLevelItemCount(), 2);
+	EXPECT_EQ(table->topLevelItem(0)->text(0), QStringLiteral("Alpha"));
+	EXPECT_EQ(table->topLevelItem(1)->text(0), QStringLiteral("Beta"));
+
+	// Each row carries a Settings button whose "index" property is its row
+	for (int i = 0; i < 2; i++) {
+		QWidget *actions = table->itemWidget(table->topLevelItem(i), 1);
+		ASSERT_NE(actions, nullptr) << "row " << i;
+		auto *button = actions->findChild<QPushButton *>();
+		ASSERT_NE(button, nullptr) << "row " << i;
+		EXPECT_EQ(button->text(), QStringLiteral("Settings"));
+		EXPECT_EQ(button->property("index").toInt(), i);
+	}
+}
+
+TEST(DialogOTIOProperties, EmptyListAndButtonBoxResults)
+{
+	ColorManager::set_up_default_config();
+
+	Project project;
+	project.initialize();
+
+	{
+		OTIOPropertiesDialog dialog(
+			{}, reinterpret_cast<OakEngineProject *>(&project));
+
+		auto *table = dialog.findChild<QTreeWidget *>();
+		ASSERT_NE(table, nullptr);
+		EXPECT_EQ(table->topLevelItemCount(), 0);
+
+		auto *buttons = dialog.findChild<QDialogButtonBox *>();
+		ASSERT_NE(buttons, nullptr);
+		QPushButton *ok = buttons->button(QDialogButtonBox::Ok);
+		ASSERT_NE(ok, nullptr);
+		ok->click();
+		EXPECT_EQ(dialog.result(), QDialog::Accepted);
+	}
+
+	{
+		OTIOPropertiesDialog dialog(
+			{}, reinterpret_cast<OakEngineProject *>(&project));
+
+		auto *buttons = dialog.findChild<QDialogButtonBox *>();
+		ASSERT_NE(buttons, nullptr);
+		QPushButton *cancel = buttons->button(QDialogButtonBox::Cancel);
+		ASSERT_NE(cancel, nullptr);
+		cancel->click();
+		EXPECT_EQ(dialog.result(), QDialog::Rejected);
+	}
+}

tests/gtest/widget_nodeparamview_test.cpp

@@ -0,0 +1,846 @@
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include <QApplication>
+#include <QCheckBox>
+#include <QLabel>
+#include <QMouseEvent>
+#include <QPlainTextEdit>
+#include <QPushButton>
+#include <QSignalSpy>
+#include <QTest>
+
+#include "core.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/generator/text/textv3.h"
+#include "node/globals.h"
+#include "node/math/math/math.h"
+#include "node/project.h"
+#include "node/project/folder/folder.h"
+#include "oakengine/app.h"
+#include "undo/undostack.h"
+#include "widget/clickablelabel/clickablelabel.h"
+#include "widget/collapsebutton/collapsebutton.h"
+#include "widget/nodeparamview/nodeparambutton.h"
+#include "widget/nodeparamview/nodeparamviewarraywidget.h"
+#include "widget/nodeparamview/nodeparamviewconnectedlabel.h"
+#include "widget/nodeparamview/nodeparamviewcontext.h"
+#include "widget/nodeparamview/nodeparamviewitem.h"
+#include "widget/nodeparamview/nodeparamviewitemtitlebar.h"
+#include "widget/nodeparamview/nodeparamviewkeyframecontrol.h"
+#include "widget/nodeparamview/nodeparamviewtextedit.h"
+
+namespace
+{
+
+// Widgets that connect to Core::instance() at construction require the
+// application singleton, but not a MainWindow
+void ensure_core()
+{
+	if (!olive::Core::instance()) {
+		new olive::Core(); // intentionally leaked
+	}
+}
+
+// Helper: wrap an engine Node* as oak::Node for the C ABI widget interface
+inline oak::Node to_oak(olive::Node *n)
+{
+	return oak::Node(reinterpret_cast<OakEngineNode *>(n));
+}
+
+// Helper: build an oak::Input value from an engine Node* + input id
+inline oak::Input to_oak_input(olive::Node *n, const QString &input,
+							   int element = -1)
+{
+	return oak::Input(reinterpret_cast<OakEngineNode *>(n), input, element);
+}
+
+// The process-wide undo stack previously reached via Core::undo_stack();
+// facade calls below (array insert/remove, keyframing, edge disconnect) push
+// commands onto it, so it must be cleared before the owning Project dies
+inline olive::UndoStack *app_undo_stack()
+{
+	return static_cast<olive::UndoStack *>(oakengine_app_undo_stack());
+}
+
+// Minimal node with a plain float output so it can feed MathNode's
+// parameter inputs in connection tests
+class FloatSourceNode : public olive::Node {
+public:
+	FloatSourceNode() = default;
+
+	NODE_DEFAULT_FUNCTIONS(FloatSourceNode)
+
+	virtual QString name() const override
+	{
+		return QStringLiteral("Test Float Source");
+	}
+
+	virtual QString id() const override
+	{
+		return QStringLiteral("org.oak.test.floatsource");
+	}
+
+	virtual QVector<CategoryID> category() const override
+	{
+		return { k_category_math };
+	}
+
+	virtual void value(const olive::NodeValueRow &value,
+					   const olive::NodeGlobals &globals,
+					   olive::NodeValueTable *table) const override
+	{
+		Q_UNUSED(value)
+		Q_UNUSED(globals)
+
+		table->push(olive::NodeValue::k_float, QVariant(1.5), this);
+	}
+};
+
+// Sends a mouse event straight to the widget, bypassing child hit-testing
+// and cursor tracking (deterministic under the offscreen QPA)
+void send_mouse_event(QWidget *w, QEvent::Type type, const QPointF &pos)
+{
+	QMouseEvent ev(type, pos, pos, pos, Qt::LeftButton, Qt::LeftButton,
+				   Qt::NoModifier);
+	QApplication::sendEvent(w, &ev);
+}
+
+} // namespace
+
+// ---------------------------------------------------------------------------
+// NodeParamButton (global namespace, plain QPushButton with a stored name)
+// ---------------------------------------------------------------------------
+
+TEST(WidgetNodeParamButton, ClickEmitsStoredName)
+{
+	NodeParamButton btn(QStringLiteral("volume"));
+
+	// The name is stored separately; it is not used as the button text
+	EXPECT_TRUE(btn.text().isEmpty());
+
+	QSignalSpy spy(&btn, &NodeParamButton::on_pressed);
+	btn.click();
+
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_EQ(spy.first().first().toString(), QStringLiteral("volume"));
+}
+
+TEST(WidgetNodeParamButton, InstancesEmitTheirOwnNames)
+{
+	NodeParamButton a(QStringLiteral("alpha"));
+	NodeParamButton b(QStringLiteral("beta"));
+
+	QStringList received;
+	QObject::connect(&a, &NodeParamButton::on_pressed,
+					 [&received](const QString &n) { received.append(n); });
+	QObject::connect(&b, &NodeParamButton::on_pressed,
+					 [&received](const QString &n) { received.append(n); });
+
+	b.click();
+	a.click();
+	b.click();
+
+	ASSERT_EQ(received.size(), 3);
+	EXPECT_EQ(received.at(0), QStringLiteral("beta"));
+	EXPECT_EQ(received.at(1), QStringLiteral("alpha"));
+	EXPECT_EQ(received.at(2), QStringLiteral("beta"));
+}
+
+// ---------------------------------------------------------------------------
+// NodeParamViewItemTitleBar
+// ---------------------------------------------------------------------------
+
+TEST(WidgetNodeParamViewItemTitleBar, DefaultsAreExpandedWithHiddenButtons)
+{
+	olive::NodeParamViewItemTitleBar bar;
+
+	// CollapseButton defaults to checked, so the bar starts expanded
+	EXPECT_TRUE(bar.is_expanded());
+
+	auto *collapse = bar.findChild<olive::CollapseButton *>();
+	ASSERT_NE(collapse, nullptr);
+	EXPECT_TRUE(collapse->isChecked());
+	EXPECT_TRUE(collapse->isVisibleTo(&bar));
+
+	// Pin / add-effect / enabled-checkbox all start hidden
+	QPushButton *pin = nullptr;
+	QPushButton *add_fx = nullptr;
+	for (QPushButton *b : bar.findChildren<QPushButton *>()) {
+		if (b == collapse) {
+			continue;
+		}
+		if (b->text() == QStringLiteral("P")) {
+			pin = b;
+		} else {
+			add_fx = b;
+		}
+	}
+	ASSERT_NE(pin, nullptr);
+	ASSERT_NE(add_fx, nullptr);
+	EXPECT_TRUE(pin->isCheckable());
+	EXPECT_FALSE(pin->isVisibleTo(&bar));
+	EXPECT_FALSE(add_fx->isVisibleTo(&bar));
+
+	auto *checkbox = bar.findChild<QCheckBox *>();
+	ASSERT_NE(checkbox, nullptr);
+	EXPECT_FALSE(checkbox->isVisibleTo(&bar));
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, SetExpandedRoundTripsWithoutSignal)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	QSignalSpy spy(&bar,
+				   &olive::NodeParamViewItemTitleBar::expanded_state_changed);
+
+	bar.set_expanded(false);
+	EXPECT_FALSE(bar.is_expanded());
+
+	bar.set_expanded(true);
+	EXPECT_TRUE(bar.is_expanded());
+
+	// Programmatic expansion changes do not count as user interaction
+	EXPECT_EQ(spy.count(), 0);
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, SetTextUpdatesLabelAndTooltip)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	bar.set_text(QStringLiteral("My Node"));
+
+	auto *lbl = bar.findChild<QLabel *>();
+	ASSERT_NE(lbl, nullptr);
+	EXPECT_EQ(lbl->text(), QStringLiteral("My Node"));
+	EXPECT_EQ(lbl->toolTip(), QStringLiteral("My Node"));
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, VisibilitySettersToggleChildren)
+{
+	olive::NodeParamViewItemTitleBar bar;
+
+	QPushButton *pin = nullptr;
+	QPushButton *add_fx = nullptr;
+	for (QPushButton *b : bar.findChildren<QPushButton *>()) {
+		if (qobject_cast<olive::CollapseButton *>(b)) {
+			continue;
+		}
+		if (b->text() == QStringLiteral("P")) {
+			pin = b;
+		} else {
+			add_fx = b;
+		}
+	}
+	auto *checkbox = bar.findChild<QCheckBox *>();
+	ASSERT_NE(pin, nullptr);
+	ASSERT_NE(add_fx, nullptr);
+	ASSERT_NE(checkbox, nullptr);
+
+	bar.set_pin_button_visible(true);
+	EXPECT_TRUE(pin->isVisibleTo(&bar));
+	EXPECT_FALSE(add_fx->isVisibleTo(&bar));
+
+	bar.set_add_effect_button_visible(true);
+	EXPECT_TRUE(add_fx->isVisibleTo(&bar));
+
+	bar.set_enabled_check_box_visible(true);
+	EXPECT_TRUE(checkbox->isVisibleTo(&bar));
+
+	bar.set_pin_button_visible(false);
+	EXPECT_FALSE(pin->isVisibleTo(&bar));
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, EnabledCheckBoxCheckedRoundTrips)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	auto *checkbox = bar.findChild<QCheckBox *>();
+	ASSERT_NE(checkbox, nullptr);
+	EXPECT_FALSE(checkbox->isChecked());
+
+	bar.set_enabled_check_box_checked(true);
+	EXPECT_TRUE(checkbox->isChecked());
+
+	bar.set_enabled_check_box_checked(false);
+	EXPECT_FALSE(checkbox->isChecked());
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, CollapseClickEmitsExpandedState)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	auto *collapse = bar.findChild<olive::CollapseButton *>();
+	ASSERT_NE(collapse, nullptr);
+
+	QSignalSpy spy(&bar,
+				   &olive::NodeParamViewItemTitleBar::expanded_state_changed);
+
+	// Starts expanded; clicking collapses
+	collapse->click();
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_FALSE(spy.first().first().toBool());
+
+	collapse->click();
+	ASSERT_EQ(spy.count(), 2);
+	EXPECT_TRUE(spy.at(1).first().toBool());
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, ButtonsForwardTheirSignals)
+{
+	olive::NodeParamViewItemTitleBar bar;
+
+	QPushButton *pin = nullptr;
+	QPushButton *add_fx = nullptr;
+	for (QPushButton *b : bar.findChildren<QPushButton *>()) {
+		if (qobject_cast<olive::CollapseButton *>(b)) {
+			continue;
+		}
+		if (b->text() == QStringLiteral("P")) {
+			pin = b;
+		} else {
+			add_fx = b;
+		}
+	}
+	auto *checkbox = bar.findChild<QCheckBox *>();
+	ASSERT_NE(pin, nullptr);
+	ASSERT_NE(add_fx, nullptr);
+	ASSERT_NE(checkbox, nullptr);
+
+	QSignalSpy pin_spy(&bar, &olive::NodeParamViewItemTitleBar::pin_toggled);
+	QSignalSpy add_spy(
+		&bar, &olive::NodeParamViewItemTitleBar::add_effect_button_clicked);
+	QSignalSpy enabled_spy(
+		&bar, &olive::NodeParamViewItemTitleBar::enabled_check_box_clicked);
+
+	pin->click();
+	ASSERT_EQ(pin_spy.count(), 1);
+	EXPECT_TRUE(pin_spy.first().first().toBool());
+
+	add_fx->click();
+	EXPECT_EQ(add_spy.count(), 1);
+
+	checkbox->click();
+	ASSERT_EQ(enabled_spy.count(), 1);
+	EXPECT_TRUE(enabled_spy.first().first().toBool());
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, MousePressEmitsClicked)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	QSignalSpy spy(&bar, &olive::NodeParamViewItemTitleBar::clicked);
+
+	send_mouse_event(&bar, QEvent::MouseButtonPress, QPointF(5, 5));
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST(WidgetNodeParamViewItemTitleBar, DoubleClickTogglesExpansion)
+{
+	olive::NodeParamViewItemTitleBar bar;
+	ASSERT_TRUE(bar.is_expanded());
+
+	QSignalSpy spy(&bar,
+				   &olive::NodeParamViewItemTitleBar::expanded_state_changed);
+
+	send_mouse_event(&bar, QEvent::MouseButtonDblClick, QPointF(5, 5));
+	EXPECT_FALSE(bar.is_expanded());
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_FALSE(spy.first().first().toBool());
+
+	send_mouse_event(&bar, QEvent::MouseButtonDblClick, QPointF(5, 5));
+	EXPECT_TRUE(bar.is_expanded());
+	EXPECT_EQ(spy.count(), 2);
+}
+
+// ---------------------------------------------------------------------------
+// NodeParamViewTextEdit
+// ---------------------------------------------------------------------------
+
+TEST(WidgetNodeParamViewTextEdit, SetTextRoundTripsWithoutSignal)
+{
+	olive::NodeParamViewTextEdit w;
+	QSignalSpy spy(&w, &olive::NodeParamViewTextEdit::text_edited);
+
+	w.setText(QStringLiteral("hello"));
+	EXPECT_EQ(w.text(), QStringLiteral("hello"));
+
+	// Programmatic changes don't count as user edits
+	EXPECT_EQ(spy.count(), 0);
+}
+
+TEST(WidgetNodeParamViewTextEdit, TypingEmitsTextEdited)
+{
+	olive::NodeParamViewTextEdit w;
+	auto *edit = w.findChild<QPlainTextEdit *>();
+	ASSERT_NE(edit, nullptr);
+
+	QSignalSpy spy(&w, &olive::NodeParamViewTextEdit::text_edited);
+	QTest::keyClicks(edit, QStringLiteral("hi"));
+
+	ASSERT_EQ(spy.count(), 2);
+	EXPECT_EQ(spy.first().first().toString(), QStringLiteral("h"));
+	EXPECT_EQ(spy.at(1).first().toString(), QStringLiteral("hi"));
+	EXPECT_EQ(w.text(), QStringLiteral("hi"));
+}
+
+TEST(WidgetNodeParamViewTextEdit, SetTextPreservingCursorKeepsPosition)
+{
+	olive::NodeParamViewTextEdit w;
+	auto *edit = w.findChild<QPlainTextEdit *>();
+	ASSERT_NE(edit, nullptr);
+
+	w.setText(QStringLiteral("hello"));
+	QTextCursor c = edit->textCursor();
+	c.setPosition(5);
+	edit->setTextCursor(c);
+
+	w.setTextPreservingCursor(QStringLiteral("hello world"));
+
+	EXPECT_EQ(w.text(), QStringLiteral("hello world"));
+	EXPECT_EQ(edit->textCursor().position(), 5);
+}
+
+TEST(WidgetNodeParamViewTextEdit, ViewerOnlyModeSwapsVisibleChildren)
+{
+	olive::NodeParamViewTextEdit w;
+	auto *edit = w.findChild<QPlainTextEdit *>();
+	ASSERT_NE(edit, nullptr);
+
+	QPushButton *viewer_btn = nullptr;
+	QPushButton *edit_btn = nullptr;
+	for (QPushButton *b : w.findChildren<QPushButton *>()) {
+		if (b->text() == QStringLiteral("Edit In Viewer")) {
+			viewer_btn = b;
+		} else {
+			edit_btn = b;
+		}
+	}
+	ASSERT_NE(viewer_btn, nullptr);
+	ASSERT_NE(edit_btn, nullptr);
+
+	// Default mode: plain-text edit + dialog button, no viewer button
+	EXPECT_TRUE(edit->isVisibleTo(&w));
+	EXPECT_TRUE(edit_btn->isVisibleTo(&w));
+	EXPECT_FALSE(viewer_btn->isVisibleTo(&w));
+
+	w.set_edit_in_viewer_only_mode(true);
+	EXPECT_FALSE(edit->isVisibleTo(&w));
+	EXPECT_FALSE(edit_btn->isVisibleTo(&w));
+	EXPECT_TRUE(viewer_btn->isVisibleTo(&w));
+
+	w.set_edit_in_viewer_only_mode(false);
+	EXPECT_TRUE(edit->isVisibleTo(&w));
+	EXPECT_TRUE(edit_btn->isVisibleTo(&w));
+	EXPECT_FALSE(viewer_btn->isVisibleTo(&w));
+}
+
+TEST(WidgetNodeParamViewTextEdit, EditInViewerButtonEmitsRequest)
+{
+	olive::NodeParamViewTextEdit w;
+
+	QPushButton *viewer_btn = nullptr;
+	for (QPushButton *b : w.findChildren<QPushButton *>()) {
+		if (b->text() == QStringLiteral("Edit In Viewer")) {
+			viewer_btn = b;
+			break;
+		}
+	}
+	ASSERT_NE(viewer_btn, nullptr);
+
+	QSignalSpy spy(&w, &olive::NodeParamViewTextEdit::request_edit_in_viewer);
+	viewer_btn->click();
+	EXPECT_EQ(spy.count(), 1);
+}
+
+// NOTE: the other push button opens a modal TextDialog (exec()); not
+// testable under the offscreen QPA.
+
+// ---------------------------------------------------------------------------
+// Shared fixture for the engine-backed widgets
+// ---------------------------------------------------------------------------
+
+class NodeParamViewTest : public ::testing::Test {
+protected:
+	void SetUp() override
+	{
+		olive::ColorManager::set_up_default_config();
+		ensure_core();
+
+		project_ = std::make_unique<olive::Project>();
+		project_->initialize();
+	}
+
+	void TearDown() override
+	{
+		// Undo commands pushed by facade calls reference project nodes
+		app_undo_stack()->clear();
+		project_.reset();
+	}
+
+	template <typename T> T *add_node()
+	{
+		auto *node = new T();
+		node->setParent(project_.get());
+		return node;
+	}
+
+	std::unique_ptr<olive::Project> project_;
+};
+
+// ---------------------------------------------------------------------------
+// NodeParamViewConnectedLabel
+// ---------------------------------------------------------------------------
+
+TEST_F(NodeParamViewTest, ConnectedLabelDisconnectedInputShowsNothing)
+{
+	auto *math = add_node<olive::MathNode>();
+
+	olive::NodeParamViewConnectedLabel w(
+		to_oak_input(math, olive::MathNode::k_param_a_in));
+
+	auto *lbl = w.findChild<olive::ClickableLabel *>();
+	ASSERT_NE(lbl, nullptr);
+	EXPECT_EQ(lbl->text(), QStringLiteral("Nothing"));
+}
+
+TEST_F(NodeParamViewTest, ConnectedLabelShowsSourceNameWhenConnected)
+{
+	auto *source = add_node<FloatSourceNode>();
+	auto *math = add_node<olive::MathNode>();
+
+	olive::Node::connect_edge(
+		source, olive::NodeInput(math, olive::MathNode::k_param_a_in));
+
+	olive::NodeParamViewConnectedLabel w(
+		to_oak_input(math, olive::MathNode::k_param_a_in));
+
+	auto *lbl = w.findChild<olive::ClickableLabel *>();
+	ASSERT_NE(lbl, nullptr);
+	EXPECT_EQ(lbl->text(), QStringLiteral("Test Float Source"));
+}
+
+TEST_F(NodeParamViewTest, ConnectedLabelTracksLiveConnectAndDisconnect)
+{
+	auto *source = add_node<FloatSourceNode>();
+	auto *math = add_node<olive::MathNode>();
+
+	olive::NodeParamViewConnectedLabel w(
+		to_oak_input(math, olive::MathNode::k_param_a_in));
+	auto *lbl = w.findChild<olive::ClickableLabel *>();
+	ASSERT_NE(lbl, nullptr);
+	EXPECT_EQ(lbl->text(), QStringLiteral("Nothing"));
+
+	// The widget subscribes to the engine's edge events via its bridge
+	OakEngineNode *src_handle = reinterpret_cast<OakEngineNode *>(source);
+	OakEngineNode *math_handle = reinterpret_cast<OakEngineNode *>(math);
+	const QByteArray input_id = olive::MathNode::k_param_a_in.toUtf8();
+
+	ASSERT_EQ(oakengine_node_connect(src_handle, math_handle,
+									 input_id.constData()),
+			  OAKENGINE_OK);
+	EXPECT_EQ(lbl->text(), QStringLiteral("Test Float Source"));
+
+	ASSERT_EQ(oakengine_node_disconnect(math_handle, input_id.constData()),
+			  OAKENGINE_OK);
+	EXPECT_EQ(lbl->text(), QStringLiteral("Nothing"));
+}
+
+TEST_F(NodeParamViewTest, ConnectedLabelClickRequestsSourceSelection)
+{
+	auto *source = add_node<FloatSourceNode>();
+	auto *math = add_node<olive::MathNode>();
+
+	olive::Node::connect_edge(
+		source, olive::NodeInput(math, olive::MathNode::k_param_a_in));
+
+	olive::NodeParamViewConnectedLabel w(
+		to_oak_input(math, olive::MathNode::k_param_a_in));
+	w.resize(400, 40);
+	w.show();
+	EXPECT_TRUE(QTest::qWaitForWindowExposed(&w));
+
+	auto *lbl = w.findChild<olive::ClickableLabel *>();
+	ASSERT_NE(lbl, nullptr);
+
+	// ClickableLabel only emits when the cursor is over it; if the
+	// offscreen platform can't track the cursor there's nothing to assert
+	QTest::mouseMove(lbl, QPoint(5, 5));
+	if (!lbl->underMouse()) {
+		GTEST_SKIP() << "Platform does not track cursor position";
+	}
+
+	OakEngineNode *received = nullptr;
+	QObject::connect(&w, &olive::NodeParamViewConnectedLabel::request_select_node,
+					 [&received](OakEngineNode *n) { received = n; });
+
+	QTest::mouseClick(lbl, Qt::LeftButton);
+	EXPECT_EQ(received, reinterpret_cast<OakEngineNode *>(source));
+}
+
+// ---------------------------------------------------------------------------
+// NodeParamViewKeyframeControl
+// ---------------------------------------------------------------------------
+
+TEST_F(NodeParamViewTest, KeyframeControlInvalidInputDisablesEverything)
+{
+	olive::NodeParamViewKeyframeControl control;
+	EXPECT_FALSE(control.get_connected_input().is_valid());
+
+	// Both constructor forms build the same four buttons
+	olive::NodeParamViewKeyframeControl left_aligned(false, nullptr);
+	for (QWidget *c : { static_cast<QWidget *>(&control),
+						static_cast<QWidget *>(&left_aligned) }) {
+		const auto buttons = c->findChildren<QPushButton *>();
+		ASSERT_EQ(buttons.size(), 4);
+
+		int checkable_count = 0;
+		for (QPushButton *b : buttons) {
+			EXPECT_FALSE(b->isEnabled());
+			if (b->isCheckable()) {
+				checkable_count++;
+			}
+		}
+		// toggle + enable are checkable, prev/next are not
+		EXPECT_EQ(checkable_count, 2);
+	}
+
+	// With keyframing off only the enable button is shown
+	int visible_count = 0;
+	for (QPushButton *b : control.findChildren<QPushButton *>()) {
+		if (b->isVisibleTo(&control)) {
+			visible_count++;
+			EXPECT_TRUE(b->isCheckable());
+			EXPECT_FALSE(b->isChecked());
+		}
+	}
+	EXPECT_EQ(visible_count, 1);
+}
+
+TEST_F(NodeParamViewTest, KeyframeControlSetInputEnablesButtons)
+{
+	auto *math = add_node<olive::MathNode>();
+
+	olive::NodeParamViewKeyframeControl control;
+	control.set_input(to_oak_input(math, olive::MathNode::k_param_a_in));
+
+	EXPECT_TRUE(control.get_connected_input().is_valid());
+	EXPECT_EQ(control.get_connected_input().input_id(),
+			  olive::MathNode::k_param_a_in);
+
+	const auto buttons = control.findChildren<QPushButton *>();
+	ASSERT_EQ(buttons.size(), 4);
+	for (QPushButton *b : buttons) {
+		EXPECT_TRUE(b->isEnabled());
+	}
+
+	// Input is not keyframing yet: nav buttons stay hidden, enable unchecked
+	for (QPushButton *b : buttons) {
+		if (b->isCheckable() && b->isVisibleTo(&control)) {
+			EXPECT_FALSE(b->isChecked()); // the enable button
+		} else {
+			EXPECT_FALSE(b->isVisibleTo(&control)); // prev/toggle/next
+		}
+	}
+}
+
+TEST_F(NodeParamViewTest, KeyframeControlReflectsKeyframingChanges)
+{
+	auto *math = add_node<olive::MathNode>();
+
+	olive::NodeParamViewKeyframeControl control;
+	control.set_input(to_oak_input(math, olive::MathNode::k_param_a_in));
+
+	// Identify the enable button while it is the only visible checkable one
+	QPushButton *enable_btn = nullptr;
+	for (QPushButton *b : control.findChildren<QPushButton *>()) {
+		if (b->isCheckable() && b->isVisibleTo(&control)) {
+			enable_btn = b;
+			break;
+		}
+	}
+	ASSERT_NE(enable_btn, nullptr);
+	EXPECT_FALSE(enable_btn->isChecked());
+
+	OakEngineNode *handle = reinterpret_cast<OakEngineNode *>(math);
+	const QByteArray input_id = olive::MathNode::k_param_a_in.toUtf8();
+
+	// Enabling keyframing through the facade fires the bridge event, which
+	// checks the enable button and reveals the navigation buttons
+	ASSERT_EQ(oakengine_node_set_input_keyframing(handle, input_id.constData(),
+												  -1, 1, 0, 1, nullptr),
+			  OAKENGINE_OK);
+	EXPECT_TRUE(enable_btn->isChecked());
+	for (QPushButton *b : control.findChildren<QPushButton *>()) {
+		EXPECT_TRUE(b->isVisibleTo(&control));
+	}
+
+	// Disabling hides the navigation buttons again
+	ASSERT_EQ(oakengine_node_set_input_keyframing(handle, input_id.constData(),
+												  -1, 0, 0, 1, nullptr),
+			  OAKENGINE_OK);
+	EXPECT_FALSE(enable_btn->isChecked());
+	for (QPushButton *b : control.findChildren<QPushButton *>()) {
+		EXPECT_EQ(b->isVisibleTo(&control), b == enable_btn);
+	}
+}
+
+// ---------------------------------------------------------------------------
+// NodeParamViewArrayWidget / NodeParamViewArrayButton
+// ---------------------------------------------------------------------------
+
+TEST(WidgetNodeParamViewArrayButton, TypeDeterminesText)
+{
+	olive::NodeParamViewArrayButton add(olive::NodeParamViewArrayButton::k_add);
+	EXPECT_EQ(add.text(), QStringLiteral("+"));
+
+	olive::NodeParamViewArrayButton remove(
+		olive::NodeParamViewArrayButton::k_remove);
+	EXPECT_EQ(remove.text(), QStringLiteral("-"));
+}
+
+TEST_F(NodeParamViewTest, ArrayWidgetCounterTracksArraySize)
+{
+	auto *text = add_node<olive::TextGeneratorV3>();
+
+	olive::NodeParamViewArrayWidget w(to_oak(text),
+									  olive::TextGeneratorV3::k_args_input);
+
+	auto *lbl = w.findChild<QLabel *>();
+	ASSERT_NE(lbl, nullptr);
+	EXPECT_EQ(lbl->text(), QStringLiteral("0 element(s)"));
+
+	OakEngineNode *handle = reinterpret_cast<OakEngineNode *>(text);
+	const QByteArray input_id = olive::TextGeneratorV3::k_args_input.toUtf8();
+
+	// The widget subscribes to the engine's array-size event via its bridge
+	ASSERT_EQ(oakengine_node_array_insert_at(handle, input_id.constData(), 0),
+			  OAKENGINE_OK);
+	EXPECT_EQ(lbl->text(), QStringLiteral("1 element(s)"));
+
+	ASSERT_EQ(oakengine_node_array_insert_at(handle, input_id.constData(), 1),
+			  OAKENGINE_OK);
+	EXPECT_EQ(lbl->text(), QStringLiteral("2 element(s)"));
+
+	ASSERT_EQ(oakengine_node_array_remove_at(handle, input_id.constData(), 0),
+			  OAKENGINE_OK);
+	EXPECT_EQ(lbl->text(), QStringLiteral("1 element(s)"));
+}
+
+TEST_F(NodeParamViewTest, ArrayWidgetDoubleClickEmitsSignal)
+{
+	auto *text = add_node<olive::TextGeneratorV3>();
+
+	olive::NodeParamViewArrayWidget w(to_oak(text),
+									  olive::TextGeneratorV3::k_args_input);
+
+	QSignalSpy spy(&w, &olive::NodeParamViewArrayWidget::double_clicked);
+	send_mouse_event(&w, QEvent::MouseButtonDblClick, QPointF(2, 2));
+	EXPECT_EQ(spy.count(), 1);
+}
+
+// ---------------------------------------------------------------------------
+// NodeParamViewContext
+// ---------------------------------------------------------------------------
+
+TEST_F(NodeParamViewTest, ContextDefaultConstruction)
+{
+	olive::NodeParamViewContext ctx;
+
+	EXPECT_NE(ctx.get_dock_area(), nullptr);
+	EXPECT_TRUE(ctx.get_contexts().isEmpty());
+	EXPECT_TRUE(ctx.get_items().isEmpty());
+}
+
+TEST_F(NodeParamViewTest, ContextAddAndRemoveContexts)
+{
+	auto *math = add_node<olive::MathNode>();
+	auto *folder = add_node<olive::Folder>();
+
+	olive::NodeParamViewContext ctx;
+	ctx.add_context(to_oak(math));
+	ctx.add_context(to_oak(folder));
+
+	ASSERT_EQ(ctx.get_contexts().size(), 2);
+	EXPECT_EQ(ctx.get_contexts().at(0), to_oak(math));
+	EXPECT_EQ(ctx.get_contexts().at(1), to_oak(folder));
+
+	ctx.remove_context(to_oak(math));
+	ASSERT_EQ(ctx.get_contexts().size(), 1);
+	EXPECT_EQ(ctx.get_contexts().first(), to_oak(folder));
+
+	// Removing something that isn't there is a no-op
+	ctx.remove_context(to_oak(math));
+	EXPECT_EQ(ctx.get_contexts().size(), 1);
+}
+
+TEST_F(NodeParamViewTest, ContextAddGetAndRemoveNodeItems)
+{
+	auto *math = add_node<olive::MathNode>();
+	auto *folder = add_node<olive::Folder>();
+
+	olive::NodeParamViewContext ctx;
+
+	auto *item = new olive::NodeParamViewItem(to_oak(math),
+											  olive::k_no_check_boxes, &ctx);
+	item->set_context(to_oak(folder));
+
+	ctx.add_node(item);
+	ASSERT_EQ(ctx.get_items().size(), 1);
+	EXPECT_EQ(ctx.get_items().first(), item);
+
+	// Lookup matches on (node, context) pair only
+	EXPECT_EQ(ctx.get_item(to_oak(math), to_oak(folder)), item);
+	EXPECT_EQ(ctx.get_item(to_oak(folder), to_oak(math)), nullptr);
+	EXPECT_EQ(ctx.get_item(to_oak(math), to_oak(math)), nullptr);
+
+	olive::NodeParamViewItem *about_to_delete = nullptr;
+	QObject::connect(
+		&ctx, &olive::NodeParamViewContext::about_to_delete_item,
+		[&about_to_delete](olive::NodeParamViewItem *i) {
+			about_to_delete = i;
+		});
+
+	// Removing a non-matching pair leaves the item alone
+	ctx.remove_node(to_oak(math), to_oak(math));
+	EXPECT_EQ(ctx.get_items().size(), 1);
+	EXPECT_EQ(about_to_delete, nullptr);
+
+	ctx.remove_node(to_oak(math), to_oak(folder));
+	EXPECT_EQ(about_to_delete, item);
+	EXPECT_TRUE(ctx.get_items().isEmpty());
+	EXPECT_EQ(ctx.get_item(to_oak(math), to_oak(folder)), nullptr);
+}
+
+TEST_F(NodeParamViewTest, ContextRemoveNodesWithContextRemovesOnlyMatches)
+{
+	auto *math_a = add_node<olive::MathNode>();
+	auto *math_b = add_node<olive::MathNode>();
+	auto *folder_a = add_node<olive::Folder>();
+	auto *folder_b = add_node<olive::Folder>();
+
+	olive::NodeParamViewContext ctx;
+
+	auto *item_a = new olive::NodeParamViewItem(to_oak(math_a),
+												olive::k_no_check_boxes, &ctx);
+	item_a->set_context(to_oak(folder_a));
+	auto *item_b = new olive::NodeParamViewItem(to_oak(math_b),
+												olive::k_no_check_boxes, &ctx);
+	item_b->set_context(to_oak(folder_b));
+
+	ctx.add_node(item_a);
+	ctx.add_node(item_b);
+	ASSERT_EQ(ctx.get_items().size(), 2);
+
+	QVector<olive::NodeParamViewItem *> deleted;
+	QObject::connect(&ctx, &olive::NodeParamViewContext::about_to_delete_item,
+					 [&deleted](olive::NodeParamViewItem *i) {
+						 deleted.append(i);
+					 });
+
+	ctx.remove_nodes_with_context(to_oak(folder_a));
+
+	ASSERT_EQ(deleted.size(), 1);
+	EXPECT_EQ(deleted.first(), item_a);
+
+	ASSERT_EQ(ctx.get_items().size(), 1);
+	EXPECT_EQ(ctx.get_items().first(), item_b);
+	EXPECT_EQ(ctx.get_item(to_oak(math_a), to_oak(folder_a)), nullptr);
+	EXPECT_EQ(ctx.get_item(to_oak(math_b), to_oak(folder_b)), item_b);
+}

tests/gtest/widget_projectexplorer2_test.cpp

@@ -0,0 +1,539 @@
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include <QImage>
+#include <QLabel>
+#include <QPainter>
+#include <QPushButton>
+#include <QSignalSpy>
+#include <QSlider>
+#include <QStandardItemModel>
+#include <QStringListModel>
+#include <QStyleOptionViewItem>
+#include <QTest>
+
+#include "core.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/project.h"
+#include "node/project/footage/footage.h"
+#include "node/project/folder/folder.h"
+#include "oakutil/define.h"
+#include "render/diskmanager.h"
+#include "widget/projectexplorer/projectexplorericonview.h"
+#include "widget/projectexplorer/projectexplorericonviewitemdelegate.h"
+#include "widget/projectexplorer/projectexplorerlistview.h"
+#include "widget/projectexplorer/projectexplorerlistviewbase.h"
+#include "widget/projectexplorer/projectexplorerlistviewitemdelegate.h"
+#include "widget/projectexplorer/projectexplorernavigation.h"
+#include "widget/projectexplorer/projectexplorertreeview.h"
+
+using namespace olive;
+
+namespace
+{
+
+// Undo commands that rename/move items go through app-wide singletons
+void ensure_app_singletons()
+{
+	if (!olive::Core::instance()) {
+		new olive::Core(); // intentionally leaked
+	}
+	if (!olive::DiskManager::instance()) {
+		olive::DiskManager::create_instance();
+	}
+}
+
+} // namespace
+
+TEST(ProjectExplorerNavigation, DefaultsMatchDocumentedState)
+{
+	ProjectExplorerNavigation nav(nullptr);
+
+	auto *dir_up = nav.findChild<QPushButton *>();
+	auto *label = nav.findChild<QLabel *>();
+	auto *slider = nav.findChild<QSlider *>();
+	ASSERT_NE(dir_up, nullptr);
+	ASSERT_NE(label, nullptr);
+	ASSERT_NE(slider, nullptr);
+
+	// Root folder assumption: no parent to go up to, no folder name
+	EXPECT_FALSE(dir_up->isEnabled());
+	EXPECT_TRUE(label->text().isEmpty());
+
+	// Slider spans the project icon size constants, defaulting to the default
+	EXPECT_EQ(slider->minimum(), k_project_icon_size_minimum);
+	EXPECT_EQ(slider->maximum(), k_project_icon_size_maximum);
+	EXPECT_EQ(slider->value(), k_project_icon_size_default);
+	EXPECT_EQ(slider->orientation(), Qt::Horizontal);
+}
+
+TEST(ProjectExplorerNavigation, SetTextUpdatesLabel)
+{
+	ProjectExplorerNavigation nav(nullptr);
+	auto *label = nav.findChild<QLabel *>();
+	ASSERT_NE(label, nullptr);
+
+	nav.set_text(QStringLiteral("Media"));
+	EXPECT_EQ(label->text(), QStringLiteral("Media"));
+
+	nav.set_text(QString());
+	EXPECT_TRUE(label->text().isEmpty());
+}
+
+TEST(ProjectExplorerNavigation, DirUpButtonOnlyEmitsWhenEnabled)
+{
+	ProjectExplorerNavigation nav(nullptr);
+	auto *dir_up = nav.findChild<QPushButton *>();
+	ASSERT_NE(dir_up, nullptr);
+
+	QSignalSpy spy(&nav, &ProjectExplorerNavigation::directory_up_clicked);
+
+	// Disabled button swallows clicks
+	dir_up->click();
+	EXPECT_EQ(spy.count(), 0);
+
+	nav.set_dir_up_enabled(true);
+	EXPECT_TRUE(dir_up->isEnabled());
+
+	dir_up->click();
+	EXPECT_EQ(spy.count(), 1);
+
+	// Disabling again silences it
+	nav.set_dir_up_enabled(false);
+	dir_up->click();
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST(ProjectExplorerNavigation, SizeSliderEmitsSizeChanged)
+{
+	ProjectExplorerNavigation nav(nullptr);
+	auto *slider = nav.findChild<QSlider *>();
+	ASSERT_NE(slider, nullptr);
+
+	QSignalSpy spy(&nav, &ProjectExplorerNavigation::size_changed);
+
+	slider->setValue(k_project_icon_size_minimum);
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_EQ(spy.first().first().toInt(), k_project_icon_size_minimum);
+
+	// The setter is implemented as a plain slider setValue, so despite the
+	// header comment claiming otherwise it does forward through the signal
+	nav.set_size_value(k_project_icon_size_maximum);
+	EXPECT_EQ(slider->value(), k_project_icon_size_maximum);
+	ASSERT_EQ(spy.count(), 2);
+	EXPECT_EQ(spy.at(1).first().toInt(), k_project_icon_size_maximum);
+
+	// Setting the same value again is a no-op, as QSlider only emits on change
+	nav.set_size_value(k_project_icon_size_maximum);
+	EXPECT_EQ(spy.count(), 2);
+}
+
+TEST(ProjectExplorerListViewBase, ConstructionDefaults)
+{
+	ProjectExplorerListViewBase view(nullptr);
+
+	EXPECT_EQ(view.movement(), QListView::Free);
+	EXPECT_EQ(view.selectionMode(), QAbstractItemView::ExtendedSelection);
+	EXPECT_EQ(view.resizeMode(), QListView::Adjust);
+	EXPECT_EQ(view.contextMenuPolicy(), Qt::CustomContextMenu);
+}
+
+TEST(ProjectExplorerListViewBase, DoubleClickEmptyAreaEmitsSignal)
+{
+	QStringListModel model({ QStringLiteral("One"), QStringLiteral("Two"),
+							 QStringLiteral("Three") });
+
+	ProjectExplorerListViewBase view(nullptr);
+	view.setModel(&model);
+	view.resize(400, 300);
+	view.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&view));
+
+	const QModelIndex first = model.index(0, 0);
+	const QRect item_rect = view.visualRect(first);
+	if (!item_rect.isValid()) {
+		GTEST_SKIP() << "View did not lay out items under the offscreen platform";
+	}
+
+	int hits = 0;
+	QObject::connect(&view,
+					 &ProjectExplorerListViewBase::double_clicked_empty_area,
+					 [&hits] { ++hits; });
+
+	// Double clicking an item is not an empty-area click
+	QTest::mouseDClick(view.viewport(), Qt::LeftButton, Qt::NoModifier,
+					   item_rect.center());
+	EXPECT_EQ(hits, 0);
+
+	// Double clicking below the last item is
+	const QPoint empty(view.viewport()->width() - 4,
+					   view.viewport()->height() - 4);
+	if (view.indexAt(empty).isValid()) {
+		GTEST_SKIP() << "Could not find an item-free spot in the viewport";
+	}
+	QTest::mouseDClick(view.viewport(), Qt::LeftButton, Qt::NoModifier, empty);
+	EXPECT_EQ(hits, 1);
+}
+
+TEST(ProjectExplorerListViewBase, CtrlClickExtendsSelection)
+{
+	QStringListModel model({ QStringLiteral("One"), QStringLiteral("Two"),
+							 QStringLiteral("Three") });
+
+	ProjectExplorerListViewBase view(nullptr);
+	view.setModel(&model);
+	view.resize(400, 300);
+	view.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&view));
+
+	const QModelIndex first = model.index(0, 0);
+	const QModelIndex third = model.index(2, 0);
+	const QRect first_rect = view.visualRect(first);
+	const QRect third_rect = view.visualRect(third);
+	if (!first_rect.isValid() || !third_rect.isValid()) {
+		GTEST_SKIP() << "View did not lay out items under the offscreen platform";
+	}
+
+	// Plain click selects exactly one item and makes it current
+	QTest::mouseClick(view.viewport(), Qt::LeftButton, Qt::NoModifier,
+					  first_rect.center());
+	EXPECT_EQ(view.selectionModel()->currentIndex(), first);
+	EXPECT_EQ(view.selectionModel()->selectedIndexes().size(), 1);
+
+	// ExtendedSelection: Ctrl+click adds to the selection instead of replacing
+	QTest::mouseClick(view.viewport(), Qt::LeftButton, Qt::ControlModifier,
+					  third_rect.center());
+	const QModelIndexList selected = view.selectionModel()->selectedIndexes();
+	EXPECT_EQ(selected.size(), 2);
+	EXPECT_TRUE(selected.contains(first));
+	EXPECT_TRUE(selected.contains(third));
+}
+
+TEST(ProjectExplorerListView, UsesListModeAndItemDelegate)
+{
+	ProjectExplorerListView view(nullptr);
+
+	EXPECT_EQ(view.viewMode(), QListView::ListMode);
+
+	// The delegate classes carry no Q_OBJECT, so cast with RTTI
+	EXPECT_NE(dynamic_cast<ProjectExplorerListViewItemDelegate *>(
+				  view.itemDelegate()),
+			  nullptr);
+
+	// Inherits the base view behavior
+	EXPECT_EQ(view.selectionMode(), QAbstractItemView::ExtendedSelection);
+	EXPECT_EQ(view.contextMenuPolicy(), Qt::CustomContextMenu);
+}
+
+TEST(ProjectExplorerIconView, UsesIconModeAndItemDelegate)
+{
+	ProjectExplorerIconView view(nullptr);
+
+	EXPECT_EQ(view.viewMode(), QListView::IconMode);
+
+	EXPECT_NE(dynamic_cast<ProjectExplorerIconViewItemDelegate *>(
+				  view.itemDelegate()),
+			  nullptr);
+
+	EXPECT_EQ(view.selectionMode(), QAbstractItemView::ExtendedSelection);
+}
+
+TEST(ProjectExplorerTreeView, ConstructionDefaultsEnableDragDrop)
+{
+	ProjectExplorerTreeView view(nullptr);
+
+	EXPECT_EQ(view.selectionMode(), QAbstractItemView::ExtendedSelection);
+	EXPECT_EQ(view.dragDropMode(), QAbstractItemView::DragDrop);
+	EXPECT_TRUE(view.dragEnabled());
+	EXPECT_TRUE(view.acceptDrops());
+	EXPECT_EQ(view.contextMenuPolicy(), Qt::CustomContextMenu);
+}
+
+TEST(ProjectExplorerTreeView, DoubleClickEmptyAreaEmitsSignal)
+{
+	QStringListModel model({ QStringLiteral("One"), QStringLiteral("Two"),
+							 QStringLiteral("Three") });
+
+	ProjectExplorerTreeView view(nullptr);
+	view.setModel(&model);
+	view.resize(400, 300);
+	view.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&view));
+
+	const QModelIndex first = model.index(0, 0);
+	const QRect item_rect = view.visualRect(first);
+	if (!item_rect.isValid()) {
+		GTEST_SKIP() << "View did not lay out items under the offscreen platform";
+	}
+
+	int hits = 0;
+	QObject::connect(&view, &ProjectExplorerTreeView::double_clicked_empty_area,
+					 [&hits] { ++hits; });
+
+	QTest::mouseDClick(view.viewport(), Qt::LeftButton, Qt::NoModifier,
+					   item_rect.center());
+	EXPECT_EQ(hits, 0);
+
+	const QPoint empty(view.viewport()->width() - 4,
+					   view.viewport()->height() - 4);
+	if (view.indexAt(empty).isValid()) {
+		GTEST_SKIP() << "Could not find an item-free spot in the viewport";
+	}
+	QTest::mouseDClick(view.viewport(), Qt::LeftButton, Qt::NoModifier, empty);
+	EXPECT_EQ(hits, 1);
+}
+
+TEST(ProjectExplorerListViewItemDelegate, SizeHintIsSquareFromDecorationHeight)
+{
+	ProjectExplorerListViewItemDelegate delegate;
+
+	QStyleOptionViewItem opt;
+	opt.decorationSize = QSize(10, 32);
+	EXPECT_EQ(delegate.sizeHint(opt, QModelIndex()), QSize(32, 32));
+
+	opt.decorationSize = QSize(64, 20);
+	EXPECT_EQ(delegate.sizeHint(opt, QModelIndex()), QSize(20, 20));
+}
+
+TEST(ProjectExplorerListViewItemDelegate, PaintFillsHighlightWhenSelected)
+{
+	QStandardItemModel model;
+	model.appendRow(new QStandardItem(QStringLiteral("Clip")));
+
+	QStyleOptionViewItem opt;
+	opt.rect = QRect(0, 0, 200, 24);
+	opt.decorationSize = QSize(24, 24);
+
+	ProjectExplorerListViewItemDelegate delegate;
+
+	// Selected rows are filled with the palette highlight
+	QImage selected_img(200, 24, QImage::Format_ARGB32);
+	selected_img.fill(Qt::transparent);
+	opt.state = QStyle::State_Enabled | QStyle::State_Selected;
+	{
+		QPainter p(&selected_img);
+		delegate.paint(&p, opt, model.index(0, 0));
+	}
+	EXPECT_EQ(selected_img.pixelColor(0, 0).rgb(),
+			  opt.palette.highlight().color().rgb());
+
+	// Unselected rows paint nothing into the icon area (no icon set)
+	QImage plain_img(200, 24, QImage::Format_ARGB32);
+	plain_img.fill(Qt::transparent);
+	opt.state = QStyle::State_Enabled;
+	{
+		QPainter p(&plain_img);
+		delegate.paint(&p, opt, model.index(0, 0));
+	}
+	EXPECT_EQ(plain_img.pixelColor(0, 0).alpha(), 0);
+}
+
+TEST(ProjectExplorerIconViewItemDelegate, SizeHintIsFixed)
+{
+	ProjectExplorerIconViewItemDelegate delegate;
+
+	QStyleOptionViewItem opt;
+	opt.decorationSize = QSize(16, 16);
+
+	// Always 256x256 regardless of the option
+	EXPECT_EQ(delegate.sizeHint(opt, QModelIndex()), QSize(256, 256));
+	EXPECT_EQ(delegate.sizeHint(QStyleOptionViewItem(), QModelIndex()),
+			  QSize(256, 256));
+}
+
+TEST(ProjectExplorerIconViewItemDelegate, PaintDrawsTextBand)
+{
+	QStandardItemModel model;
+	model.appendRow(new QStandardItem(QStringLiteral("Clip")));
+	const QModelIndex index = model.index(0, 0);
+	model.setData(index, QStringLiteral("00:00:01:00"), Qt::UserRole);
+
+	ProjectExplorerIconViewItemDelegate delegate;
+
+	QStyleOptionViewItem opt;
+	opt.rect = QRect(0, 0, 256, 256);
+
+	// The text band occupies the bottom fm.height() rows of the cell; the
+	// painter over a bare QImage uses the default application font
+	const QFontMetrics fm((QFont()));
+	const int band_top = opt.rect.height() - fm.height();
+	ASSERT_GT(opt.rect.height() / 2, fm.height());
+
+	// Unselected: band background is white
+	QImage plain_img(256, 256, QImage::Format_ARGB32);
+	plain_img.fill(Qt::transparent);
+	opt.state = QStyle::State_Enabled;
+	{
+		QPainter p(&plain_img);
+		delegate.paint(&p, opt, index);
+	}
+	EXPECT_EQ(plain_img.pixelColor(opt.rect.width() / 2, band_top).rgb(),
+			  QColor(Qt::white).rgb());
+
+	// Selected: band background follows the palette highlight
+	QImage selected_img(256, 256, QImage::Format_ARGB32);
+	selected_img.fill(Qt::transparent);
+	opt.state = QStyle::State_Enabled | QStyle::State_Selected;
+	{
+		QPainter p(&selected_img);
+		delegate.paint(&p, opt, index);
+	}
+	EXPECT_EQ(selected_img.pixelColor(opt.rect.width() / 2, band_top).rgb(),
+			  opt.palette.highlight().color().rgb());
+}
+
+class ProjectExplorerUndoTest : public ::testing::Test {
+protected:
+	void SetUp() override
+	{
+		ColorManager::set_up_default_config();
+		ensure_app_singletons();
+
+		project_ = std::make_unique<Project>();
+		project_->initialize();
+	}
+
+	template <typename T> T *make_node()
+	{
+		auto *node = new T();
+		node->setParent(project_.get());
+		return node;
+	}
+
+	std::unique_ptr<Project> project_;
+};
+
+TEST_F(ProjectExplorerUndoTest, FolderAddChildRedoUndoRoundTrips)
+{
+	Folder *root = project_->root();
+	Footage *footage = make_node<Footage>();
+	ASSERT_EQ(root->item_child_count(), 0);
+	ASSERT_EQ(footage->folder(), nullptr);
+
+	FolderAddChild cmd(root, footage);
+	EXPECT_EQ(cmd.get_relevant_project(), project_.get());
+
+	cmd.redo_now();
+	EXPECT_EQ(root->item_child_count(), 1);
+	EXPECT_EQ(root->item_child(0), footage);
+	EXPECT_EQ(footage->folder(), root);
+
+	// UndoCommand guards on a done flag: a second redo is a no-op
+	cmd.redo_now();
+	EXPECT_EQ(root->item_child_count(), 1);
+
+	cmd.undo_now();
+	EXPECT_EQ(root->item_child_count(), 0);
+	EXPECT_EQ(footage->folder(), nullptr);
+
+	// Likewise a second undo does nothing
+	cmd.undo_now();
+	EXPECT_EQ(root->item_child_count(), 0);
+}
+
+TEST_F(ProjectExplorerUndoTest, FolderAddChildEmitsFolderInsertRemoveSignals)
+{
+	Folder *root = project_->root();
+	Footage *footage = make_node<Footage>();
+
+	// The signal payload carries Node*, which is not a registered metatype,
+	// so count with lambdas rather than QSignalSpy
+	int insert_began = 0, insert_ended = 0, remove_began = 0, remove_ended = 0;
+	Node *inserted_node = nullptr;
+	int inserted_index = -1;
+	QObject::connect(root, &Folder::begin_insert_item,
+					 [&](Node *n, int index) {
+						 ++insert_began;
+						 inserted_node = n;
+						 inserted_index = index;
+					 });
+	QObject::connect(root, &Folder::end_insert_item,
+					 [&] { ++insert_ended; });
+	QObject::connect(root, &Folder::begin_remove_item,
+					 [&](Node *, int) { ++remove_began; });
+	QObject::connect(root, &Folder::end_remove_item,
+					 [&] { ++remove_ended; });
+
+	FolderAddChild cmd(root, footage);
+	cmd.redo_now();
+	EXPECT_EQ(insert_began, 1);
+	EXPECT_EQ(insert_ended, 1);
+	EXPECT_EQ(inserted_node, footage);
+	EXPECT_EQ(inserted_index, 0);
+	EXPECT_EQ(remove_began, 0);
+
+	cmd.undo_now();
+	EXPECT_EQ(remove_began, 1);
+	EXPECT_EQ(remove_ended, 1);
+	EXPECT_EQ(insert_began, 1);
+}
+
+TEST_F(ProjectExplorerUndoTest, RemoveElementCommandRedoUndoRoundTrips)
+{
+	Folder *root = project_->root();
+	Footage *a = make_node<Footage>();
+	Footage *b = make_node<Footage>();
+	FolderAddChild(root, a).redo_now();
+	FolderAddChild(root, b).redo_now();
+	ASSERT_EQ(root->item_child_count(), 2);
+
+	Folder::RemoveElementCommand cmd(root, a);
+	EXPECT_EQ(cmd.get_relevant_project(), project_.get());
+
+	cmd.redo_now();
+	EXPECT_EQ(root->item_child_count(), 1);
+	EXPECT_EQ(root->index_of_child(a), -1);
+	EXPECT_EQ(a->folder(), nullptr);
+	EXPECT_EQ(b->folder(), root);
+
+	cmd.undo_now();
+	EXPECT_EQ(root->item_child_count(), 2);
+	EXPECT_NE(root->index_of_child(a), -1);
+	EXPECT_EQ(a->folder(), root);
+	EXPECT_EQ(b->folder(), root);
+}
+
+TEST_F(ProjectExplorerUndoTest, RemoveElementCommandOnNonChildIsNoOp)
+{
+	Folder *root = project_->root();
+	Footage *stray = make_node<Footage>();
+	ASSERT_EQ(root->item_child_count(), 0);
+
+	// The child was never connected to the folder, so the command finds no
+	// array index and both directions do nothing
+	Folder::RemoveElementCommand cmd(root, stray);
+	cmd.redo_now();
+	EXPECT_EQ(root->item_child_count(), 0);
+	EXPECT_EQ(stray->folder(), nullptr);
+
+	cmd.undo_now();
+	EXPECT_EQ(root->item_child_count(), 0);
+}
+
+TEST_F(ProjectExplorerUndoTest, NestedFolderAddChildTracksHierarchy)
+{
+	Folder *root = project_->root();
+	Folder *folder = make_node<Folder>();
+	Footage *footage = make_node<Footage>();
+
+	FolderAddChild add_folder(root, folder);
+	add_folder.redo_now();
+	FolderAddChild add_footage(folder, footage);
+	add_footage.redo_now();
+
+	EXPECT_EQ(root->item_child_count(), 1);
+	EXPECT_EQ(folder->item_child_count(), 1);
+	EXPECT_TRUE(root->has_child_recursive(footage));
+	EXPECT_EQ(footage->folder(), folder);
+
+	// Undoing the inner add leaves the folder in place but empty
+	add_footage.undo_now();
+	EXPECT_EQ(folder->item_child_count(), 0);
+	EXPECT_EQ(footage->folder(), nullptr);
+	EXPECT_EQ(folder->folder(), root);
+
+	add_folder.undo_now();
+	EXPECT_EQ(root->item_child_count(), 0);
+	EXPECT_EQ(folder->folder(), nullptr);
+}

tests/gtest/widget_scope_test.cpp

@@ -0,0 +1,589 @@
+#include <gtest/gtest.h>
+
+#include <memory>
+
+#include <QAction>
+#include <QSignalSpy>
+#include <QTest>
+
+#include "config/config.h"
+#include "node/color/colormanager/colormanager.h"
+#include "node/project.h"
+#include "widget/colorwheel/colorswatchwidget.h"
+#include "widget/manageddisplay/manageddisplay.h"
+#include "widget/menu/menu.h"
+#include "widget/scope/histogram/histogram.h"
+#include "widget/scope/scopebase/scopebase.h"
+#include "widget/scope/vectorscope/vectorscope.h"
+#include "widget/scope/waveform/waveform.h"
+
+namespace
+{
+
+// ManagedDisplayWidget is abstract (on_paint), so a minimal concrete probe is
+// needed even for tests that only exercise the base-class behavior
+class ProbeDisplayWidget : public olive::ManagedDisplayWidget {
+public:
+	using olive::ManagedDisplayWidget::ManagedDisplayWidget;
+
+	void *pub_renderer() const
+	{
+		return renderer();
+	}
+	bool pub_backend_neutral() const
+	{
+		return is_backend_neutral();
+	}
+
+	int processor_changed_events = 0;
+
+protected:
+	virtual void on_paint() override
+	{
+	}
+
+	virtual void color_processor_changed_event() override
+	{
+		processor_changed_events++;
+		olive::ManagedDisplayWidget::color_processor_changed_event();
+	}
+};
+
+// Exposes the protected renderer state of the concrete scopes so tests can
+// verify construction wiring without a GL context
+class ProbeHistogramScope : public olive::HistogramScope {
+public:
+	void *pub_renderer() const
+	{
+		return renderer();
+	}
+	bool pub_backend_neutral() const
+	{
+		return is_backend_neutral();
+	}
+};
+
+class ProbeWaveformScope : public olive::WaveformScope {
+public:
+	void *pub_renderer() const
+	{
+		return renderer();
+	}
+	bool pub_backend_neutral() const
+	{
+		return is_backend_neutral();
+	}
+	oak_video_params pub_viewport_params() const
+	{
+		return get_viewport_params();
+	}
+};
+
+class ProbeVectorscopeScope : public olive::VectorscopeScope {
+public:
+	void *pub_renderer() const
+	{
+		return renderer();
+	}
+	bool pub_backend_neutral() const
+	{
+		return is_backend_neutral();
+	}
+};
+
+// ColorSwatchWidget is abstract (get_color_from_screen_pos); this probe maps
+// screen position deterministically to a color and records the change events
+class ProbeSwatchWidget : public olive::ColorSwatchWidget {
+public:
+	olive::Color pub_managed_color(const olive::Color &c) const
+	{
+		return get_managed_color(c);
+	}
+	Qt::GlobalColor pub_selector_color() const
+	{
+		return get_ui_selector_color();
+	}
+
+	int changed_events = 0;
+	bool last_external = false;
+
+protected:
+	virtual olive::Color get_color_from_screen_pos(const QPoint &p) const override
+	{
+		return olive::Color(p.x() / 100.0, p.y() / 100.0, 0.5);
+	}
+
+	virtual void SelectedColorChangedEvent(const olive::Color &c,
+										   bool external) override
+	{
+		changed_events++;
+		last_external = external;
+		olive::ColorSwatchWidget::SelectedColorChangedEvent(c, external);
+	}
+};
+
+// Returns the index of the first action whose data differs from the current
+// transform component, or -1 when the menu offers no alternative
+int alternative_action_index(olive::Menu *menu, const QString &current)
+{
+	const QList<QAction *> acts = menu->actions();
+	for (int i = 0; i < acts.size(); i++) {
+		if (acts.at(i)->data().toString() != current) {
+			return i;
+		}
+	}
+	return -1;
+}
+
+} // namespace
+
+TEST(WidgetManagedDisplay, DefaultConstructionState)
+{
+	ProbeDisplayWidget w;
+
+	EXPECT_EQ(w.color_manager(), nullptr);
+	EXPECT_NE(w.pub_renderer(), nullptr);
+
+	// No transform has been chosen yet
+	const oak::ColorTransform &t = w.get_color_transform();
+	EXPECT_FALSE(t.is_display());
+	EXPECT_TRUE(t.output().isEmpty());
+	EXPECT_TRUE(t.view().isEmpty());
+	EXPECT_TRUE(t.look().isEmpty());
+
+	EXPECT_EQ(w.processor_changed_events, 0);
+}
+
+TEST(WidgetManagedDisplay, SetColorTransformWithoutManagerRoundTrips)
+{
+	ProbeDisplayWidget w;
+
+	// ColorProcessorHandlePtr is not a registered metatype, so count the
+	// signal through a direct lambda connection instead of QSignalSpy
+	int signal_count = 0;
+	olive::ColorProcessorHandlePtr last_processor;
+	QObject::connect(&w, &olive::ManagedDisplayWidget::color_processor_changed,
+					 [&signal_count, &last_processor](
+						 olive::ColorProcessorHandlePtr p) {
+						 signal_count++;
+						 last_processor = p;
+					 });
+
+	w.set_color_transform(
+		oak::ColorTransform(QStringLiteral("MyDisplay"),
+							QStringLiteral("MyView"), QStringLiteral("MyLook")));
+
+	const oak::ColorTransform &t = w.get_color_transform();
+	EXPECT_TRUE(t.is_display());
+	EXPECT_EQ(t.display(), QStringLiteral("MyDisplay"));
+	EXPECT_EQ(t.view(), QStringLiteral("MyView"));
+	EXPECT_EQ(t.look(), QStringLiteral("MyLook"));
+
+	// With no color manager connected, the processor is cleared and the
+	// change is signalled once
+	EXPECT_EQ(signal_count, 1);
+	EXPECT_EQ(last_processor, nullptr);
+	EXPECT_EQ(w.processor_changed_events, 1);
+
+	// A plain colorspace transform stores only the output name
+	w.set_color_transform(oak::ColorTransform(QStringLiteral("ACEScg")));
+	EXPECT_FALSE(w.get_color_transform().is_display());
+	EXPECT_EQ(w.get_color_transform().output(), QStringLiteral("ACEScg"));
+	EXPECT_EQ(signal_count, 2);
+}
+
+TEST(WidgetManagedDisplay, ConnectColorManagerDefaultsToDisplayViewTransform)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+
+	int manager_signals = 0;
+	OakEngineColorManager *last_manager = nullptr;
+	QObject::connect(&w, &olive::ManagedDisplayWidget::color_manager_changed,
+					 [&manager_signals,
+					  &last_manager](OakEngineColorManager *m) {
+						 manager_signals++;
+						 last_manager = m;
+					 });
+
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	EXPECT_EQ(w.color_manager(),
+			  olive::oak_color_manager(project.color_manager()));
+	EXPECT_EQ(manager_signals, 1);
+	EXPECT_EQ(last_manager, olive::oak_color_manager(project.color_manager()));
+
+	// An empty transform is conformed to the config's default display/view so
+	// the widget would show a sensible image
+	const oak::ColorTransform &t = w.get_color_transform();
+	EXPECT_TRUE(t.is_display());
+	EXPECT_FALSE(t.display().isEmpty());
+	EXPECT_FALSE(t.view().isEmpty());
+
+	// Connecting the same manager again is a no-op
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+	EXPECT_EQ(manager_signals, 1);
+}
+
+TEST(WidgetManagedDisplay, DisconnectColorManagerClearsState)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	int manager_signals = 0;
+	OakEngineColorManager *last_manager =
+		olive::oak_color_manager(project.color_manager());
+	QObject::connect(&w, &olive::ManagedDisplayWidget::color_manager_changed,
+					 [&manager_signals,
+					  &last_manager](OakEngineColorManager *m) {
+						 manager_signals++;
+						 last_manager = m;
+					 });
+
+	w.disconnect_color_manager();
+
+	EXPECT_EQ(w.color_manager(), nullptr);
+	EXPECT_EQ(manager_signals, 1);
+	EXPECT_EQ(last_manager, nullptr);
+}
+
+TEST(WidgetManagedDisplay, DisplayMenuReflectsCurrentTransform)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	std::unique_ptr<olive::Menu> menu(w.get_display_menu(nullptr));
+	ASSERT_FALSE(menu->actions().isEmpty());
+
+	// Exactly the current display is checked
+	int checked = 0;
+	for (QAction *a : menu->actions()) {
+		EXPECT_TRUE(a->isCheckable());
+		EXPECT_EQ(a->data().toString(), a->text());
+		if (a->isChecked()) {
+			checked++;
+			EXPECT_EQ(a->data().toString(), w.get_color_transform().display());
+		}
+	}
+	EXPECT_EQ(checked, 1);
+
+	// Picking another display (if the config has one) retargets the transform
+	const int alt =
+		alternative_action_index(menu.get(), w.get_color_transform().display());
+	if (alt >= 0) {
+		const QString target = menu->actions().at(alt)->data().toString();
+		menu->actions().at(alt)->trigger();
+		EXPECT_EQ(w.get_color_transform().display(), target);
+	}
+}
+
+TEST(WidgetManagedDisplay, ViewMenuReflectsCurrentTransform)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	std::unique_ptr<olive::Menu> menu(w.get_view_menu(nullptr));
+	ASSERT_FALSE(menu->actions().isEmpty());
+
+	int checked = 0;
+	for (QAction *a : menu->actions()) {
+		EXPECT_TRUE(a->isCheckable());
+		if (a->isChecked()) {
+			checked++;
+			EXPECT_EQ(a->data().toString(), w.get_color_transform().view());
+		}
+	}
+	EXPECT_EQ(checked, 1);
+
+	const int alt =
+		alternative_action_index(menu.get(), w.get_color_transform().view());
+	if (alt >= 0) {
+		const QString target = menu->actions().at(alt)->data().toString();
+		menu->actions().at(alt)->trigger();
+		EXPECT_EQ(w.get_color_transform().view(), target);
+		// The display component survives a view change
+		EXPECT_FALSE(w.get_color_transform().display().isEmpty());
+	}
+}
+
+TEST(WidgetManagedDisplay, LookMenuStartsWithNoLookEntry)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	std::unique_ptr<olive::Menu> menu(w.get_look_menu(nullptr));
+	ASSERT_FALSE(menu->actions().isEmpty());
+
+	// The first entry is always the "(None)" entry carrying empty data
+	QAction *none = menu->actions().first();
+	EXPECT_TRUE(none->isCheckable());
+	EXPECT_EQ(none->data().toString(), QString());
+
+	// The default transform has no look, so "(None)" is checked
+	EXPECT_TRUE(w.get_color_transform().look().isEmpty());
+	EXPECT_TRUE(none->isChecked());
+
+	for (int i = 1; i < menu->actions().size(); i++) {
+		EXPECT_TRUE(menu->actions().at(i)->isCheckable());
+		EXPECT_EQ(menu->actions().at(i)->data().toString(),
+				  menu->actions().at(i)->text());
+	}
+}
+
+TEST(WidgetManagedDisplay, ColorSpaceMenuListsConfigSpaces)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeDisplayWidget w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	const QStringList spaces =
+		project.color_manager()->list_available_colorspaces();
+	ASSERT_GE(spaces.size(), 2);
+
+	std::unique_ptr<olive::Menu> menu(w.get_color_space_menu(nullptr));
+	ASSERT_EQ(menu->actions().size(), spaces.size());
+
+	for (int i = 0; i < spaces.size(); i++) {
+		EXPECT_EQ(menu->actions().at(i)->data().toString(), spaces.at(i));
+	}
+
+	// Selecting a colorspace switches to a non-display transform
+	const int alt =
+		alternative_action_index(menu.get(), w.get_color_transform().output());
+	if (alt >= 0) {
+		const QString target = menu->actions().at(alt)->data().toString();
+		menu->actions().at(alt)->trigger();
+		EXPECT_EQ(w.get_color_transform().output(), target);
+	}
+}
+
+TEST(WidgetScopeBase, ViewportParamsTrackWidgetGeometry)
+{
+	ProbeWaveformScope w;
+	w.resize(640, 360);
+
+	const oak_video_params vp = w.pub_viewport_params();
+	EXPECT_EQ(vp.width, int(640 * w.devicePixelRatioF()));
+	EXPECT_EQ(vp.height, int(360 * w.devicePixelRatioF()));
+	EXPECT_EQ(vp.format,
+			  olive::Config::current()[QStringLiteral("OfflinePixelFormat")]
+				  .toInt());
+}
+
+TEST(WidgetHistogramScope, ConstructionCreatesRendererWithoutTexture)
+{
+	ProbeHistogramScope w;
+
+	// The renderer abstraction exists right after construction, but nothing
+	// color-related is connected yet
+	EXPECT_NE(w.pub_renderer(), nullptr);
+	EXPECT_EQ(w.color_manager(), nullptr);
+	EXPECT_TRUE(w.get_color_transform().output().isEmpty());
+
+	// A null buffer is accepted and simply schedules a repaint; there is no
+	// texture to retain
+	w.set_buffer(nullptr);
+	w.set_buffer(nullptr);
+
+	EXPECT_EQ(w.color_manager(), nullptr);
+}
+
+TEST(WidgetHistogramScope, ConnectColorManagerDefaultsTransform)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeHistogramScope w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	EXPECT_EQ(w.color_manager(),
+			  olive::oak_color_manager(project.color_manager()));
+	EXPECT_TRUE(w.get_color_transform().is_display());
+	EXPECT_FALSE(w.get_color_transform().display().isEmpty());
+	EXPECT_FALSE(w.get_color_transform().view().isEmpty());
+}
+
+TEST(WidgetVectorscopeScope, ConstructionCreatesRenderer)
+{
+	ProbeVectorscopeScope w;
+
+	EXPECT_NE(w.pub_renderer(), nullptr);
+	EXPECT_EQ(w.color_manager(), nullptr);
+
+	// Null buffers are tolerated without a connected manager
+	w.set_buffer(nullptr);
+}
+
+TEST(WidgetVectorscopeScope, ConnectColorManagerDefaultsTransform)
+{
+	olive::ColorManager::set_up_default_config();
+	olive::Project project;
+
+	ProbeVectorscopeScope w;
+	w.connect_color_manager(olive::oak_color_manager(project.color_manager()));
+
+	EXPECT_TRUE(w.get_color_transform().is_display());
+	EXPECT_FALSE(w.get_color_transform().display().isEmpty());
+}
+
+TEST(WidgetWaveformScope, ParadeModeFollowsConfig)
+{
+	const QVariant old =
+		olive::Config::current()[QStringLiteral("WaveformRgbParade")];
+
+	olive::Config::current()[QStringLiteral("WaveformRgbParade")] = true;
+	{
+		ProbeWaveformScope w;
+		EXPECT_TRUE(w.parade_mode());
+		EXPECT_NE(w.pub_renderer(), nullptr);
+	}
+
+	olive::Config::current()[QStringLiteral("WaveformRgbParade")] = false;
+	{
+		ProbeWaveformScope w;
+		EXPECT_FALSE(w.parade_mode());
+	}
+
+	olive::Config::current()[QStringLiteral("WaveformRgbParade")] = old;
+}
+
+TEST(WidgetWaveformScope, SetParadeModePersistsToConfig)
+{
+	const QVariant old =
+		olive::Config::current()[QStringLiteral("WaveformRgbParade")];
+
+	{
+		ProbeWaveformScope w;
+
+		w.set_parade_mode(true);
+		EXPECT_TRUE(w.parade_mode());
+		EXPECT_TRUE(
+			olive::Config::current()[QStringLiteral("WaveformRgbParade")]
+				.toBool());
+
+		w.set_parade_mode(false);
+		EXPECT_FALSE(w.parade_mode());
+		EXPECT_FALSE(
+			olive::Config::current()[QStringLiteral("WaveformRgbParade")]
+				.toBool());
+	}
+
+	// A newly constructed scope picks the persisted value up
+	{
+		ProbeWaveformScope w;
+		EXPECT_FALSE(w.parade_mode());
+	}
+
+	olive::Config::current()[QStringLiteral("WaveformRgbParade")] = old;
+}
+
+TEST(WidgetColorSwatchWidget, SetSelectedColorRoundTrips)
+{
+	ProbeSwatchWidget w;
+
+	w.set_selected_color(olive::Color(0.2, 0.4, 0.6));
+
+	EXPECT_FLOAT_EQ(w.get_selected_color().red(), 0.2f);
+	EXPECT_FLOAT_EQ(w.get_selected_color().green(), 0.4f);
+	EXPECT_FLOAT_EQ(w.get_selected_color().blue(), 0.6f);
+
+	// Programmatic changes count as external
+	EXPECT_EQ(w.changed_events, 1);
+	EXPECT_TRUE(w.last_external);
+}
+
+TEST(WidgetColorSwatchWidget, MousePressPicksColorAndEmits)
+{
+	ProbeSwatchWidget w;
+	w.resize(100, 100);
+
+	// olive::Color is not a registered metatype in this harness, so capture
+	// the signal payload through a lambda
+	QVector<olive::Color> received;
+	QObject::connect(&w, &olive::ColorSwatchWidget::selected_color_changed,
+					 [&received](const olive::Color &c) { received.append(c); });
+
+	QTest::mouseClick(&w, Qt::LeftButton, Qt::NoModifier, QPoint(10, 20));
+
+	ASSERT_EQ(received.size(), 1);
+	EXPECT_NEAR(received.first().red(), 0.10, 1e-6);
+	EXPECT_NEAR(received.first().green(), 0.20, 1e-6);
+	EXPECT_NEAR(received.first().blue(), 0.5, 1e-6);
+
+	// User interaction is reported as non-external
+	EXPECT_EQ(w.changed_events, 1);
+	EXPECT_FALSE(w.last_external);
+
+	EXPECT_NEAR(w.get_selected_color().red(), 0.10, 1e-6);
+	EXPECT_NEAR(w.get_selected_color().green(), 0.20, 1e-6);
+}
+
+TEST(WidgetColorSwatchWidget, DragEmitsForEachMove)
+{
+	ProbeSwatchWidget w;
+	w.resize(100, 100);
+
+	QVector<olive::Color> received;
+	QObject::connect(&w, &olive::ColorSwatchWidget::selected_color_changed,
+					 [&received](const olive::Color &c) { received.append(c); });
+
+	QTest::mousePress(&w, Qt::LeftButton, Qt::NoModifier, QPoint(10, 10));
+	ASSERT_EQ(received.size(), 1);
+
+	// A move while the left button is held updates the color...
+	QTest::mouseMove(&w, QPoint(30, 40));
+	ASSERT_EQ(received.size(), 2);
+	EXPECT_NEAR(received.at(1).red(), 0.30, 1e-6);
+	EXPECT_NEAR(received.at(1).green(), 0.40, 1e-6);
+
+	QTest::mouseRelease(&w, Qt::LeftButton, Qt::NoModifier, QPoint(30, 40));
+	EXPECT_EQ(received.size(), 2);
+
+	// ...but a bare move without a pressed button is ignored
+	QTest::mouseMove(&w, QPoint(50, 50));
+	EXPECT_EQ(received.size(), 2);
+}
+
+TEST(WidgetColorSwatchWidget, ManagedColorPassesThroughWithoutProcessors)
+{
+	ProbeSwatchWidget w;
+
+	// With no color processors installed, the managed color is the input
+	const olive::Color in(0.1, 0.2, 0.3, 1.0);
+	const olive::Color out = w.pub_managed_color(in);
+	EXPECT_FLOAT_EQ(out.red(), 0.1f);
+	EXPECT_FLOAT_EQ(out.green(), 0.2f);
+	EXPECT_FLOAT_EQ(out.blue(), 0.3f);
+
+	// Setting null processors still forces a full external refresh
+	w.set_color_processor(nullptr, nullptr);
+	EXPECT_TRUE(w.last_external);
+}
+
+TEST(WidgetColorSwatchWidget, SelectorColorFollowsLuminance)
+{
+	ProbeSwatchWidget w;
+
+	// Bright swatches get a black selector, dark swatches a white one
+	w.set_selected_color(olive::Color(1.0, 1.0, 1.0));
+	EXPECT_EQ(w.pub_selector_color(), Qt::black);
+
+	w.set_selected_color(olive::Color(0.0, 0.0, 0.0));
+	EXPECT_EQ(w.pub_selector_color(), Qt::white);
+}

tests/gtest/widget_sliderbase_test.cpp

@@ -0,0 +1,436 @@
+#include <gtest/gtest.h>
+
+#include <QApplication>
+#include <QLabel>
+#include <QSignalSpy>
+
+#include "common/configwrapper.h"
+#include "widget/focusablelineedit/focusablelineedit.h"
+#include "widget/slider/base/numericsliderbase.h"
+#include "widget/slider/base/sliderlabel.h"
+#include "widget/slider/base/sliderladder.h"
+#include "widget/slider/sliderdisplaytypeapp.h"
+
+namespace
+{
+
+// NumericSliderBase is abstract (SliderBase's value_to_string /
+// string_to_value / value_signal_event are pure), so test it through a
+// minimal concrete probe that also exposes the protected entry points
+class ProbeNumericSlider : public olive::NumericSliderBase {
+public:
+	void set_value(const QVariant &v)
+	{
+		set_value_internal(v);
+	}
+
+	QVariant get_value() const
+	{
+		return get_value_internal();
+	}
+
+	QVariant get_offset_public() const
+	{
+		return get_offset();
+	}
+
+	QVariant adjust_drag_public(const QVariant &start, const double &drag) const
+	{
+		return adjust_drag_distance_internal(start, drag);
+	}
+
+	bool greater_public(const QVariant &lhs, const QVariant &rhs) const
+	{
+		return value_greater_than(lhs, rhs);
+	}
+
+	bool less_public(const QVariant &lhs, const QVariant &rhs) const
+	{
+		return value_less_than(lhs, rhs);
+	}
+
+	bool can_set_value_public() const
+	{
+		return can_set_value();
+	}
+
+	void set_minimum_public(const QVariant &v)
+	{
+		set_minimum_internal(v);
+	}
+
+	void set_maximum_public(const QVariant &v)
+	{
+		set_maximum_internal(v);
+	}
+
+	QVector<QVariant> signaled;
+
+protected:
+	virtual QString value_to_string(const QVariant &v) const override
+	{
+		return QString::number(v.toDouble());
+	}
+
+	virtual QVariant string_to_value(const QString &s, bool *ok) const override
+	{
+		return s.toDouble(ok);
+	}
+
+	virtual void value_signal_event(const QVariant &value) override
+	{
+		signaled.append(value);
+	}
+};
+
+// Forces ladder mode on for the duration of a test. Ladder mode keeps the
+// SliderLadder away from the macOS cursor-grab path
+// (CGAssociateMouseAndMouseCursorPosition), which would otherwise decouple
+// the host's real cursor while a ladder widget exists
+struct LadderConfigGuard {
+	LadderConfigGuard()
+		: old_(OAK_CONFIG("UseSliderLadders").toBool())
+	{
+		OAK_CONFIG("UseSliderLadders") = true;
+	}
+
+	~LadderConfigGuard()
+	{
+		OAK_CONFIG("UseSliderLadders") = old_;
+	}
+
+	bool old_;
+};
+
+// The drag ladder is an orphan top-level popup; dig it out of the
+// application's top-level widget list
+olive::SliderLadder *find_ladder()
+{
+	const QWidgetList tops = QApplication::topLevelWidgets();
+	for (QWidget *w : tops) {
+		if (auto *l = qobject_cast<olive::SliderLadder *>(w)) {
+			return l;
+		}
+	}
+	return nullptr;
+}
+
+// Starts a ladder drag on the slider by emitting its label's press signal
+void press_label(ProbeNumericSlider &s)
+{
+	olive::SliderLabel *label = s.findChild<olive::SliderLabel *>();
+	ASSERT_NE(label, nullptr);
+	ASSERT_TRUE(QMetaObject::invokeMethod(label, "label_pressed"));
+}
+
+} // namespace
+
+TEST(SliderDisplayType, OrdinalValuesAreAbiStable)
+{
+	// These cross the engine C ABI as ints inside node input properties; the
+	// ordinals must match engine node/sliderdisplaytype.h
+	EXPECT_EQ(int(olive::slider::k_normal), 0);
+	EXPECT_EQ(int(olive::slider::k_decibel), 1);
+	EXPECT_EQ(int(olive::slider::k_percentage), 2);
+
+	EXPECT_EQ(int(olive::slider::k_time), 0);
+	EXPECT_EQ(int(olive::slider::k_float), 1);
+	EXPECT_EQ(int(olive::slider::k_rational), 2);
+}
+
+TEST(NumericSliderBase, DefaultStateIsIdle)
+{
+	ProbeNumericSlider s;
+	EXPECT_FALSE(s.is_dragging());
+	EXPECT_TRUE(s.can_set_value_public());
+	EXPECT_EQ(s.cursor().shape(), Qt::SizeHorCursor);
+}
+
+TEST(NumericSliderBase, OffsetRoundTrips)
+{
+	ProbeNumericSlider s;
+	EXPECT_FALSE(s.get_offset_public().isValid());
+
+	s.set_offset(7);
+	EXPECT_EQ(s.get_offset_public().toInt(), 7);
+
+	s.set_offset(-2.5);
+	EXPECT_DOUBLE_EQ(s.get_offset_public().toDouble(), -2.5);
+}
+
+TEST(NumericSliderBase, DragDistanceDefaultsToAddition)
+{
+	ProbeNumericSlider s;
+	EXPECT_DOUBLE_EQ(s.adjust_drag_public(1.5, 2.25).toDouble(), 3.75);
+	EXPECT_DOUBLE_EQ(s.adjust_drag_public(1.5, -0.5).toDouble(), 1.0);
+}
+
+TEST(NumericSliderBase, ValueComparisonUsesNumericValues)
+{
+	ProbeNumericSlider s;
+	EXPECT_TRUE(s.greater_public(2.5, 2.4));
+	EXPECT_FALSE(s.greater_public(1.0, 1.0));
+	EXPECT_TRUE(s.less_public(1, 2));
+
+	// String variants compare by their numeric value, not lexicographically
+	EXPECT_TRUE(s.less_public(QStringLiteral("9"), QStringLiteral("10")));
+}
+
+TEST(NumericSliderBase, SetMinimumClampsExistingValue)
+{
+	ProbeNumericSlider s;
+
+	s.set_value(5.0);
+	s.set_minimum_public(10.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 10.0);
+
+	// New values below the minimum clamp on the way in; programmatic sets do
+	// not emit the value-changed signal
+	s.set_value(3.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 10.0);
+	EXPECT_TRUE(s.signaled.isEmpty());
+
+	s.set_value(42.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 42.0);
+}
+
+TEST(NumericSliderBase, SetMaximumClampsExistingValue)
+{
+	ProbeNumericSlider s;
+
+	s.set_value(5.0);
+	s.set_maximum_public(2.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 2.0);
+
+	s.set_value(99.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 2.0);
+
+	s.set_value(-7.0);
+	EXPECT_DOUBLE_EQ(s.get_value().toDouble(), -7.0);
+}
+
+TEST(NumericSliderBase, LadderDragUpdatesValueAndSignals)
+{
+	LadderConfigGuard guard;
+
+	{
+		ProbeNumericSlider s;
+		s.set_ladder_element_count(2);
+		s.set_value(10.0);
+
+		press_label(s);
+		ASSERT_TRUE(s.is_dragging());
+		EXPECT_FALSE(s.can_set_value_public());
+
+		olive::SliderLadder *ladder = find_ladder();
+		ASSERT_NE(ladder, nullptr);
+
+		// Two outer values either side plus the center entry
+		EXPECT_EQ(ladder->findChildren<olive::SliderLadderElement *>().size(), 5);
+
+		// External sets are blocked while the drag owns the value
+		s.set_value(50.0);
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 10.0);
+		EXPECT_TRUE(s.signaled.isEmpty());
+
+		// value * multiplier accumulates onto the drag start value
+		ASSERT_TRUE(QMetaObject::invokeMethod(
+			ladder, "dragged_by_value", Q_ARG(int, 3), Q_ARG(double, 2.0)));
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 16.0);
+		ASSERT_EQ(s.signaled.size(), 1);
+		EXPECT_DOUBLE_EQ(s.signaled.last().toDouble(), 16.0);
+
+		ASSERT_TRUE(QMetaObject::invokeMethod(
+			ladder, "dragged_by_value", Q_ARG(int, 1), Q_ARG(double, 1.0)));
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 17.0);
+		ASSERT_EQ(s.signaled.size(), 2);
+
+		// Releasing after a drag re-signals the final value and ends the drag
+		ladder->close();
+		EXPECT_FALSE(s.is_dragging());
+		EXPECT_TRUE(s.can_set_value_public());
+		ASSERT_EQ(s.signaled.size(), 3);
+		EXPECT_DOUBLE_EQ(s.signaled.last().toDouble(), 17.0);
+
+		// Programmatic sets are accepted again
+		s.set_value(3.0);
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 3.0);
+	}
+
+	// Flush the ladder's deleteLater and its queued drag-timer start only
+	// after the slider is gone, so a stray timer tick can't reach a ladder
+	// whose owner no longer exists
+	QCoreApplication::processEvents();
+}
+
+TEST(NumericSliderBase, LadderDragClampsToRange)
+{
+	LadderConfigGuard guard;
+
+	{
+		ProbeNumericSlider s;
+		s.set_ladder_element_count(2);
+		s.set_minimum_public(0.0);
+		s.set_maximum_public(8.0);
+		s.set_value(5.0);
+
+		press_label(s);
+		olive::SliderLadder *ladder = find_ladder();
+		ASSERT_NE(ladder, nullptr);
+
+		ASSERT_TRUE(QMetaObject::invokeMethod(
+			ladder, "dragged_by_value", Q_ARG(int, -10), Q_ARG(double, 1.0)));
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 0.0);
+
+		ASSERT_TRUE(QMetaObject::invokeMethod(
+			ladder, "dragged_by_value", Q_ARG(int, 100), Q_ARG(double, 1.0)));
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 8.0);
+
+		ladder->close();
+	}
+
+	QCoreApplication::processEvents();
+}
+
+TEST(NumericSliderBase, ClickWithoutDragShowsEditor)
+{
+	LadderConfigGuard guard;
+
+	{
+		ProbeNumericSlider s;
+		s.set_ladder_element_count(2);
+		s.set_value(4.0);
+
+		press_label(s);
+		olive::SliderLadder *ladder = find_ladder();
+		ASSERT_NE(ladder, nullptr);
+
+		// A press/release with no drag in between is treated as a click and
+		// opens the line editor instead of changing the value
+		ladder->close();
+		EXPECT_FALSE(s.is_dragging());
+		EXPECT_TRUE(s.signaled.isEmpty());
+
+		olive::FocusableLineEdit *editor =
+			s.findChild<olive::FocusableLineEdit *>();
+		ASSERT_NE(editor, nullptr);
+		EXPECT_EQ(s.currentWidget(), editor);
+		EXPECT_EQ(editor->text(), QStringLiteral("4"));
+		EXPECT_DOUBLE_EQ(s.get_value().toDouble(), 4.0);
+	}
+
+	QCoreApplication::processEvents();
+}
+
+TEST(SliderLadder, BuildsElementPerPowerOfTen)
+{
+	LadderConfigGuard guard;
+
+	olive::SliderLadder ladder(1.0, 2, QStringLiteral("9999"));
+	EXPECT_TRUE(ladder.windowFlags() & Qt::Popup);
+
+	const auto elements = ladder.findChildren<olive::SliderLadderElement *>();
+	ASSERT_EQ(elements.size(), 5);
+
+	// Coarse multipliers on top, the unit entry in the middle, fine below
+	EXPECT_DOUBLE_EQ(elements.at(0)->get_multiplier(), 100.0);
+	EXPECT_DOUBLE_EQ(elements.at(1)->get_multiplier(), 10.0);
+	EXPECT_DOUBLE_EQ(elements.at(2)->get_multiplier(), 1.0);
+	EXPECT_DOUBLE_EQ(elements.at(3)->get_multiplier(), 0.1);
+	EXPECT_DOUBLE_EQ(elements.at(4)->get_multiplier(), 0.01);
+
+	// Only the center entry starts highlighted
+	for (int i = 0; i < elements.size(); i++) {
+		const QPalette::ColorRole expected =
+			(i == 2) ? QPalette::Highlight : QPalette::Window;
+		EXPECT_EQ(elements.at(i)->backgroundRole(), expected) << i;
+	}
+}
+
+TEST(SliderLadder, DragMultiplierScalesElements)
+{
+	LadderConfigGuard guard;
+
+	olive::SliderLadder ladder(2.5, 1, QStringLiteral("9999"));
+
+	const auto elements = ladder.findChildren<olive::SliderLadderElement *>();
+	ASSERT_EQ(elements.size(), 3);
+	EXPECT_DOUBLE_EQ(elements.at(0)->get_multiplier(), 25.0);
+	EXPECT_DOUBLE_EQ(elements.at(1)->get_multiplier(), 2.5);
+	EXPECT_DOUBLE_EQ(elements.at(2)->get_multiplier(), 0.25);
+}
+
+TEST(SliderLadder, SetValueShowsOnHighlightedElementOnly)
+{
+	LadderConfigGuard guard;
+
+	olive::SliderLadder ladder(1.0, 1, QStringLiteral("9999"));
+	ladder.set_value(QStringLiteral("42"));
+
+	const auto elements = ladder.findChildren<olive::SliderLadderElement *>();
+	ASSERT_EQ(elements.size(), 3);
+
+	for (int i = 0; i < elements.size(); i++) {
+		QLabel *label = elements.at(i)->findChild<QLabel *>();
+		ASSERT_NE(label, nullptr);
+		if (i == 1) {
+			EXPECT_EQ(label->text(), QStringLiteral("1\n42"));
+		} else {
+			EXPECT_FALSE(label->text().contains(QStringLiteral("42")));
+		}
+	}
+}
+
+TEST(SliderLadder, CloseEmitsReleased)
+{
+	LadderConfigGuard guard;
+
+	olive::SliderLadder ladder(1.0, 1, QStringLiteral("9999"));
+	ladder.show();
+
+	QSignalSpy spy(&ladder, &olive::SliderLadder::released);
+	ladder.close();
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST(SliderLadder, SingleElementHidesMultiplier)
+{
+	LadderConfigGuard guard;
+
+	// With no outer values the ladder is a single readout, and its multiplier
+	// is hidden since there's nothing to switch between
+	olive::SliderLadder ladder(1.0, 0, QStringLiteral("9999"));
+
+	const auto elements = ladder.findChildren<olive::SliderLadderElement *>();
+	ASSERT_EQ(elements.size(), 1);
+
+	ladder.set_value(QStringLiteral("7"));
+
+	QLabel *label = elements.first()->findChild<QLabel *>();
+	ASSERT_NE(label, nullptr);
+	EXPECT_EQ(label->text(), QStringLiteral("7"));
+}
+
+TEST(SliderLadderElement, LabelReflectsHighlightAndMultiplierVisibility)
+{
+	olive::SliderLadderElement e(2.5, QStringLiteral("9999"));
+	QLabel *label = e.findChild<QLabel *>();
+	ASSERT_NE(label, nullptr);
+
+	// Unhighlighted: only the multiplier shows, the value slot stays empty
+	EXPECT_EQ(label->text(), QStringLiteral("2.5\n"));
+	EXPECT_EQ(e.backgroundRole(), QPalette::Window);
+
+	e.set_value(QStringLiteral("9"));
+	EXPECT_EQ(label->text(), QStringLiteral("2.5\n"));
+
+	e.set_highlighted(true);
+	EXPECT_EQ(label->text(), QStringLiteral("2.5\n9"));
+	EXPECT_EQ(e.backgroundRole(), QPalette::Highlight);
+
+	e.set_highlighted(false);
+	EXPECT_EQ(e.backgroundRole(), QPalette::Window);
+
+	e.set_multiplier_visible(false);
+	EXPECT_EQ(label->text(), QStringLiteral("9"));
+}

tests/gtest/widget_standardcombos_test.cpp

@@ -0,0 +1,496 @@
+#include <gtest/gtest.h>
+
+#include <vector>
+
+#include <QApplication>
+#include <QComboBox>
+#include <QEvent>
+#include <QSignalSpy>
+
+#include "render/videoparams.h"
+#include "ui/humanstrings.h"
+#include "widget/standardcombos/standardcombos.h"
+
+// These tests complement widget_combos_test.cpp, which already covers item
+// counts and basic value round-trips. Here we cover item text/data contents,
+// signal emissions, and the stateful edge cases (custom entries, restore
+// behavior, language changes).
+
+namespace
+{
+
+// QComboBox::currentIndexChanged is overloaded; spy on the int form
+QSignalSpy *index_spy(QComboBox *combo)
+{
+	return new QSignalSpy(combo,
+						  static_cast<void (QComboBox::*)(int)>(
+							  &QComboBox::currentIndexChanged));
+}
+
+} // namespace
+
+TEST(WidgetStandardCombos, SampleRateTextsAndDataMatchHumanStrings)
+{
+	olive::SampleRateComboBox combo;
+
+	ASSERT_EQ(combo.count(),
+			  int(olive::AudioParams::k_supported_sample_rates.size()));
+
+	for (int i = 0; i < combo.count(); i++) {
+		const int rate = olive::AudioParams::k_supported_sample_rates.at(i);
+		EXPECT_EQ(combo.itemData(i).toInt(), rate);
+		EXPECT_EQ(combo.itemText(i),
+				  olive::HumanStrings::sample_rate_to_string(rate));
+		EXPECT_FALSE(combo.itemText(i).isEmpty());
+	}
+}
+
+TEST(WidgetStandardCombos, SampleRateSetEmitsIndexChanged)
+{
+	olive::SampleRateComboBox combo;
+	combo.set_sample_rate(olive::AudioParams::k_supported_sample_rates.back());
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_sample_rate(olive::AudioParams::k_supported_sample_rates.front());
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(), 0);
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, SampleRateUnknownRateLeavesSelection)
+{
+	olive::SampleRateComboBox combo;
+	combo.set_sample_rate(olive::AudioParams::k_supported_sample_rates.back());
+
+	int sentinel = 7;
+	while (combo.findData(sentinel) != -1) {
+		sentinel++;
+	}
+
+	const int old_index = combo.currentIndex();
+	combo.set_sample_rate(sentinel);
+
+	EXPECT_EQ(combo.currentIndex(), old_index);
+	EXPECT_EQ(combo.get_sample_rate(),
+			  olive::AudioParams::k_supported_sample_rates.back());
+}
+
+TEST(WidgetStandardCombos, ChannelLayoutTextsAndDataMatchHumanStrings)
+{
+	olive::ChannelLayoutComboBox combo;
+
+	ASSERT_EQ(combo.count(),
+			  int(olive::AudioParams::k_supported_channel_layouts.size()));
+
+	for (int i = 0; i < combo.count(); i++) {
+		const uint64_t layout =
+			olive::AudioParams::k_supported_channel_layouts.at(i);
+		EXPECT_EQ(combo.itemData(i).toULongLong(), layout);
+		EXPECT_EQ(combo.itemText(i),
+				  olive::HumanStrings::channel_layout_to_string(layout));
+		EXPECT_FALSE(combo.itemText(i).isEmpty());
+	}
+}
+
+TEST(WidgetStandardCombos, ChannelLayoutSetEmitsIndexChanged)
+{
+	olive::ChannelLayoutComboBox combo;
+	combo.set_channel_layout(
+		olive::AudioParams::k_supported_channel_layouts.back());
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_channel_layout(
+		olive::AudioParams::k_supported_channel_layouts.front());
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(), 0);
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, ChannelLayoutUnknownLayoutLeavesSelection)
+{
+	olive::ChannelLayoutComboBox combo;
+	combo.set_channel_layout(
+		olive::AudioParams::k_supported_channel_layouts.back());
+
+	const uint64_t sentinel = ~uint64_t(0);
+	for (int i = 0; i < combo.count(); i++) {
+		ASSERT_NE(combo.itemData(i).toULongLong(), sentinel);
+	}
+
+	const int old_index = combo.currentIndex();
+	combo.set_channel_layout(sentinel);
+
+	EXPECT_EQ(combo.currentIndex(), old_index);
+	EXPECT_EQ(combo.get_channel_layout(),
+			  olive::AudioParams::k_supported_channel_layouts.back());
+}
+
+TEST(WidgetStandardCombos, InterlacedTextsMatchEnumOrder)
+{
+	olive::InterlacedComboBox combo;
+
+	ASSERT_EQ(combo.count(), 3);
+	EXPECT_EQ(combo.itemText(int(olive::VideoParams::k_interlace_none)),
+			  QStringLiteral("None (Progressive)"));
+	EXPECT_EQ(combo.itemText(int(olive::VideoParams::k_interlaced_top_first)),
+			  QStringLiteral("Top-Field First"));
+	EXPECT_EQ(
+		combo.itemText(int(olive::VideoParams::k_interlaced_bottom_first)),
+		QStringLiteral("Bottom-Field First"));
+}
+
+TEST(WidgetStandardCombos, InterlacedSetEmitsIndexChanged)
+{
+	olive::InterlacedComboBox combo;
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_interlace_mode(olive::VideoParams::k_interlaced_bottom_first);
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(),
+			  int(olive::VideoParams::k_interlaced_bottom_first));
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, PixelAspectRatioEntriesCarryNamesAndRatios)
+{
+	olive::PixelAspectRatioComboBox combo;
+
+	const QVector<olive::Rational> &standards =
+		olive::VideoParams::k_standard_pixel_aspects;
+	const QStringList names =
+		olive::VideoParams::get_standard_pixel_aspect_ratio_names();
+	ASSERT_EQ(combo.count(), standards.size() + 1);
+	ASSERT_EQ(names.size(), standards.size());
+
+	for (int i = 0; i < standards.size(); i++) {
+		EXPECT_EQ(combo.itemData(i).value<olive::Rational>(), standards.at(i));
+		EXPECT_EQ(combo.itemText(i), names.at(i));
+	}
+
+	// Default selection is the first standard ratio
+	EXPECT_EQ(combo.currentIndex(), 0);
+	EXPECT_EQ(combo.get_pixel_aspect_ratio(), standards.first());
+}
+
+TEST(WidgetStandardCombos, PixelAspectRatioCustomEntryDefaultsToSquare)
+{
+	olive::PixelAspectRatioComboBox combo;
+
+	const int last = combo.count() - 1;
+	EXPECT_EQ(combo.itemText(last), QStringLiteral("Custom..."));
+
+	// A null custom ratio is backed by 1:1 so it can never produce a 0 PAR
+	const olive::Rational data =
+		combo.itemData(last).value<olive::Rational>();
+	EXPECT_DOUBLE_EQ(data.to_double(), 1.0);
+}
+
+TEST(WidgetStandardCombos, PixelAspectRatioCustomSetRenamesLastEntry)
+{
+	olive::PixelAspectRatioComboBox combo;
+
+	const QVector<olive::Rational> &standards =
+		olive::VideoParams::k_standard_pixel_aspects;
+	const int last = combo.count() - 1;
+
+	const olive::Rational custom(17, 13);
+	combo.set_pixel_aspect_ratio(custom);
+
+	EXPECT_EQ(combo.currentIndex(), last);
+	EXPECT_TRUE(
+		combo.itemText(last).startsWith(QStringLiteral("Custom (")));
+	EXPECT_EQ(combo.itemData(last).value<olive::Rational>(), custom);
+
+	// Returning to a standard ratio selects it but keeps the custom label
+	combo.set_pixel_aspect_ratio(standards.first());
+	EXPECT_EQ(combo.currentIndex(), 0);
+	EXPECT_EQ(combo.get_pixel_aspect_ratio(), standards.first());
+	EXPECT_TRUE(
+		combo.itemText(last).startsWith(QStringLiteral("Custom (")));
+}
+
+TEST(WidgetStandardCombos, PixelAspectRatioSelectingStandardDoesNotPrompt)
+{
+	olive::PixelAspectRatioComboBox combo;
+
+	const QVector<olive::Rational> &standards =
+		olive::VideoParams::k_standard_pixel_aspects;
+	ASSERT_GE(standards.size(), 2);
+
+	// A user-style index change to a standard entry must not open the
+	// custom-ratio dialog (selecting the last entry would, so it is
+	// intentionally not exercised under the offscreen platform)
+	combo.setCurrentIndex(1);
+
+	EXPECT_EQ(combo.get_pixel_aspect_ratio(), standards.at(1));
+	EXPECT_EQ(combo.itemText(combo.count() - 1),
+			  QStringLiteral("Custom..."));
+}
+
+TEST(WidgetStandardCombos, PixelFormatEntriesOrderedWithNames)
+{
+	olive::PixelFormatComboBox combo(false);
+
+	// Preview formats u8..f32 are added in enum order
+	ASSERT_EQ(combo.count(), int(olive::core::PixelFormat::count));
+	for (int i = 0; i < combo.count(); i++) {
+		EXPECT_EQ(combo.itemData(i).toInt(), i);
+		const auto fmt = static_cast<olive::core::PixelFormat::Format>(i);
+		EXPECT_EQ(combo.itemText(i),
+				  olive::VideoParams::get_format_name(fmt));
+		EXPECT_FALSE(combo.itemText(i).isEmpty());
+	}
+
+	// Default selection is the first (u8) format
+	EXPECT_EQ(static_cast<olive::core::PixelFormat::Format>(
+				  combo.get_pixel_format()),
+			  olive::core::PixelFormat::u8);
+}
+
+TEST(WidgetStandardCombos, PixelFormatSetEmitsIndexChanged)
+{
+	olive::PixelFormatComboBox combo(false);
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_pixel_format(olive::core::PixelFormat::f32);
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(),
+			  int(olive::core::PixelFormat::f32));
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, PixelFormatFloatOnlyIgnoresIntegerFormat)
+{
+	olive::PixelFormatComboBox combo(true);
+	ASSERT_GT(combo.count(), 0);
+
+	// u8 is not a float format, so it cannot be selected here
+	combo.set_pixel_format(olive::core::PixelFormat::u8);
+
+	olive::core::PixelFormat selected =
+		static_cast<olive::core::PixelFormat::Format>(
+			combo.get_pixel_format());
+	EXPECT_TRUE(selected.is_float());
+	EXPECT_EQ(combo.currentIndex(), 0);
+}
+
+TEST(WidgetStandardCombos, SampleFormatStartsEmpty)
+{
+	olive::SampleFormatComboBox combo;
+	EXPECT_EQ(combo.count(), 0);
+}
+
+TEST(WidgetStandardCombos, SampleFormatAvailableFormatsPopulateInOrder)
+{
+	using SampleFormat = olive::core::SampleFormat;
+
+	olive::SampleFormatComboBox combo;
+
+	const std::vector<SampleFormat> formats = {
+		SampleFormat::u8, SampleFormat::s16, SampleFormat::f32
+	};
+	combo.set_available_formats(formats);
+
+	ASSERT_EQ(combo.count(), int(formats.size()));
+	for (int i = 0; i < combo.count(); i++) {
+		EXPECT_EQ(combo.itemData(i).toInt(),
+				  int(static_cast<SampleFormat::Format>(formats.at(i))));
+		EXPECT_EQ(combo.itemText(i),
+				  olive::HumanStrings::format_to_string(formats.at(i)));
+	}
+
+	// The first entry is selected by default
+	EXPECT_EQ(static_cast<SampleFormat::Format>(combo.get_sample_format()),
+			  SampleFormat::u8);
+}
+
+TEST(WidgetStandardCombos, SampleFormatRestoreDisabledReselectsFirst)
+{
+	using Format = olive::core::SampleFormat::Format;
+
+	olive::SampleFormatComboBox combo;
+	combo.set_attempt_to_restore_format(false);
+
+	combo.set_packed_formats();
+	combo.set_sample_format(olive::core::SampleFormat::f32);
+	ASSERT_EQ(static_cast<Format>(combo.get_sample_format()),
+			  olive::core::SampleFormat::f32);
+
+	// With restore disabled, repopulating falls back to the first entry
+	combo.set_packed_formats();
+	EXPECT_EQ(combo.currentIndex(), 0);
+	EXPECT_EQ(static_cast<Format>(combo.get_sample_format()),
+			  static_cast<Format>(olive::core::SampleFormat::packed_start));
+}
+
+TEST(WidgetStandardCombos, SampleFormatSetEmitsIndexChanged)
+{
+	olive::SampleFormatComboBox combo;
+	combo.set_packed_formats();
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_sample_format(olive::core::SampleFormat::f32);
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(),
+			  int(olive::core::SampleFormat::f32) -
+				  int(olive::core::SampleFormat::packed_start));
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, VideoDividerTextsAndDataMatch)
+{
+	olive::VideoDividerComboBox combo;
+
+	ASSERT_EQ(combo.count(), olive::VideoParams::k_supported_dividers.size());
+
+	for (int i = 0; i < combo.count(); i++) {
+		const int divider = olive::VideoParams::k_supported_dividers.at(i);
+		EXPECT_EQ(combo.itemData(i).toInt(), divider);
+		EXPECT_EQ(combo.itemText(i),
+				  olive::VideoParams::get_name_for_divider(divider));
+		EXPECT_FALSE(combo.itemText(i).isEmpty());
+	}
+}
+
+TEST(WidgetStandardCombos, VideoDividerSetEmitsIndexChanged)
+{
+	olive::VideoDividerComboBox combo;
+	combo.set_divider(olive::VideoParams::k_supported_dividers.last());
+
+	QSignalSpy *spy = index_spy(&combo);
+	combo.set_divider(olive::VideoParams::k_supported_dividers.first());
+
+	ASSERT_EQ(spy->count(), 1);
+	EXPECT_EQ(spy->first().first().toInt(), 0);
+	delete spy;
+}
+
+TEST(WidgetStandardCombos, VideoDividerUnknownDividerLeavesSelection)
+{
+	olive::VideoDividerComboBox combo;
+	combo.set_divider(olive::VideoParams::k_supported_dividers.last());
+
+	int sentinel = 3;
+	while (combo.findData(sentinel) != -1) {
+		sentinel += 2;
+	}
+
+	const int old_index = combo.currentIndex();
+	combo.set_divider(sentinel);
+
+	EXPECT_EQ(combo.currentIndex(), old_index);
+	EXPECT_EQ(combo.get_divider(),
+			  olive::VideoParams::k_supported_dividers.last());
+}
+
+TEST(WidgetStandardCombos, FrameRateHasTrailingCustomEntry)
+{
+	olive::FrameRateComboBox combo;
+
+	QComboBox *inner = combo.findChild<QComboBox *>();
+	ASSERT_NE(inner, nullptr);
+
+	const QVector<olive::Rational> &standards =
+		olive::VideoParams::k_supported_frame_rates;
+	ASSERT_EQ(inner->count(), standards.size() + 1);
+
+	for (int i = 0; i < standards.size(); i++) {
+		EXPECT_EQ(inner->itemData(i).value<olive::Rational>(),
+				  standards.at(i));
+		EXPECT_EQ(inner->itemText(i),
+				  olive::VideoParams::frame_rate_to_string(standards.at(i)));
+	}
+
+	EXPECT_EQ(inner->itemText(standards.size()),
+			  QStringLiteral("Custom..."));
+}
+
+TEST(WidgetStandardCombos, FrameRateProgrammaticSetDoesNotEmit)
+{
+	olive::FrameRateComboBox combo;
+
+	QSignalSpy spy(&combo, &olive::FrameRateComboBox::frame_rate_changed);
+
+	combo.set_frame_rate(olive::VideoParams::k_supported_frame_rates.at(1));
+	combo.set_frame_rate(olive::Rational(27, 2));
+	combo.set_frame_rate(olive::VideoParams::k_supported_frame_rates.at(0));
+
+	EXPECT_EQ(spy.count(), 0);
+}
+
+TEST(WidgetStandardCombos, FrameRateUserSelectionEmitsFrameRateChanged)
+{
+	olive::FrameRateComboBox combo;
+
+	QComboBox *inner = combo.findChild<QComboBox *>();
+	ASSERT_NE(inner, nullptr);
+	ASSERT_GE(olive::VideoParams::k_supported_frame_rates.size(), 3);
+
+	QSignalSpy spy(&combo, &olive::FrameRateComboBox::frame_rate_changed);
+
+	// Standard entries emit directly; only the last "Custom..." entry would
+	// open a modal input dialog, which is not exercised here
+	inner->setCurrentIndex(2);
+
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_EQ(spy.first().first().value<olive::Rational>(),
+			  olive::VideoParams::k_supported_frame_rates.at(2));
+	EXPECT_EQ(combo.get_frame_rate(),
+			  olive::VideoParams::k_supported_frame_rates.at(2));
+}
+
+TEST(WidgetStandardCombos, FrameRateCustomSetRenamesLastEntry)
+{
+	olive::FrameRateComboBox combo;
+
+	QComboBox *inner = combo.findChild<QComboBox *>();
+	ASSERT_NE(inner, nullptr);
+	const int last = inner->count() - 1;
+
+	combo.set_frame_rate(olive::Rational(27, 2));
+	EXPECT_EQ(inner->currentIndex(), last);
+	EXPECT_TRUE(
+		inner->itemText(last).startsWith(QStringLiteral("Custom (")));
+	EXPECT_EQ(combo.get_frame_rate(), olive::Rational(27, 2));
+
+	// A second custom rate replaces the label's rate
+	combo.set_frame_rate(olive::Rational(29, 2));
+	EXPECT_EQ(inner->currentIndex(), last);
+	EXPECT_EQ(combo.get_frame_rate(), olive::Rational(29, 2));
+
+	// User-selecting a standard rate afterwards emits and returns it
+	QSignalSpy spy(&combo, &olive::FrameRateComboBox::frame_rate_changed);
+	inner->setCurrentIndex(0);
+
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_EQ(spy.first().first().value<olive::Rational>(),
+			  olive::VideoParams::k_supported_frame_rates.first());
+	EXPECT_EQ(combo.get_frame_rate(),
+			  olive::VideoParams::k_supported_frame_rates.first());
+}
+
+TEST(WidgetStandardCombos, FrameRateLanguageChangePreservesCustom)
+{
+	olive::FrameRateComboBox combo;
+
+	combo.set_frame_rate(olive::Rational(27, 2));
+
+	QEvent ev(QEvent::LanguageChange);
+	QApplication::sendEvent(&combo, &ev);
+
+	QComboBox *inner = combo.findChild<QComboBox *>();
+	ASSERT_NE(inner, nullptr);
+
+	const QVector<olive::Rational> &standards =
+		olive::VideoParams::k_supported_frame_rates;
+	ASSERT_EQ(inner->count(), standards.size() + 1);
+	EXPECT_EQ(inner->currentIndex(), standards.size());
+	EXPECT_EQ(combo.get_frame_rate(), olive::Rational(27, 2));
+	EXPECT_TRUE(inner->itemText(standards.size())
+					.startsWith(QStringLiteral("Custom (")));
+}

tests/gtest/widget_timebased2_test.cpp

@@ -0,0 +1,870 @@
+#include <gtest/gtest.h>
+
+#include <QImage>
+#include <QMouseEvent>
+#include <QSignalSpy>
+#include <QTest>
+#include <QWheelEvent>
+
+#include "core.h"
+#include "node/output/viewer/viewer.h"
+#include "timeline/timelinemarker.h"
+#include "timeline/timelineworkarea.h"
+#include "widget/resizablescrollbar/resizabletimelinescrollbar.h"
+#include "widget/timebased/timebasedview.h"
+#include "widget/timebased/timebasedviewselectionmanager.h"
+#include "widget/timebased/timescaledobject.h"
+#include "widget/timetarget/timetarget.h"
+
+namespace
+{
+
+// HandMovableView (base of TimeBasedView) connects to Core::instance() at
+// construction, so the application singleton must exist
+void ensure_core()
+{
+	if (!olive::Core::instance()) {
+		new olive::Core(); // intentionally leaked
+	}
+}
+
+// TimeScaledObject is not a QObject and its interesting hooks are protected,
+// so expose them through a probe
+class ProbeScaledObject : public olive::TimeScaledObject {
+public:
+	int timebase_events = 0;
+	olive::Rational last_timebase;
+	int scale_events = 0;
+	double last_scale = 0.0;
+
+	void pub_set_minimum_scale(const double &min)
+	{
+		set_minimum_scale(min);
+	}
+	void pub_set_maximum_scale(const double &max)
+	{
+		set_maximum_scale(max);
+	}
+
+protected:
+	void TimebaseChangedEvent(const olive::Rational &tb) override
+	{
+		timebase_events++;
+		last_timebase = tb;
+	}
+
+	void ScaleChangedEvent(const double &scale) override
+	{
+		scale_events++;
+		last_scale = scale;
+	}
+};
+
+// Records the y-axis hook and exposes the protected playhead/zoom entry
+// points of TimeBasedView
+class ProbeTimeBasedView : public olive::TimeBasedView {
+public:
+	int y_scale_events = 0;
+	double last_y_scale = 0.0;
+	std::vector<void *> select_events;
+	std::vector<void *> deselect_events;
+
+	void pub_set_y_axis_enabled(bool e)
+	{
+		set_y_axis_enabled(e);
+	}
+	void pub_zoom(QWheelEvent *e, double multiplier, const QPointF &pos)
+	{
+		zoom_into_cursor_position(e, multiplier, pos);
+	}
+	bool pub_playhead_press(QMouseEvent *e)
+	{
+		return playhead_press(e);
+	}
+	bool pub_playhead_move(QMouseEvent *e)
+	{
+		return playhead_move(e);
+	}
+	bool pub_playhead_release(QMouseEvent *e)
+	{
+		return playhead_release(e);
+	}
+
+	void SelectionManagerSelectEvent(void *obj) override
+	{
+		select_events.push_back(obj);
+	}
+	void SelectionManagerDeselectEvent(void *obj) override
+	{
+		deselect_events.push_back(obj);
+	}
+
+protected:
+	void VerticalScaleChangedEvent(double scale) override
+	{
+		y_scale_events++;
+		last_y_scale = scale;
+	}
+};
+
+// Stand-in selectable object for the templated selection manager; the drag
+// paths (which need engine keyframe/marker free functions) are never
+// instantiated by these tests
+struct FakeSelectable {
+};
+
+// Records the protected TimeTargetObject hooks
+class ProbeTimeTarget : public olive::TimeTargetObject {
+public:
+	std::vector<OakEngineNode *> connected;
+	std::vector<OakEngineNode *> disconnected;
+	std::vector<OakEngineNode *> changed;
+
+protected:
+	void TimeTargetConnectEvent(OakEngineNode *n) override
+	{
+		connected.push_back(n);
+	}
+	void TimeTargetDisconnectEvent(OakEngineNode *n) override
+	{
+		disconnected.push_back(n);
+	}
+	void TimeTargetChangedEvent(OakEngineNode *n) override
+	{
+		changed.push_back(n);
+	}
+};
+
+QMouseEvent make_press(const QPointF &pos, Qt::MouseButton button,
+					   Qt::KeyboardModifiers mods = Qt::NoModifier)
+{
+	return QMouseEvent(QEvent::MouseButtonPress, pos, pos, pos, button, button,
+					   mods);
+}
+
+// The selection manager hit-tests in unscaled scene coordinates: it maps the
+// view-local click through mapToScene() and then unscale_point(). A hidden
+// QGraphicsView centers its (zero-height) scene rect inside the viewport, so
+// view-local coordinates are NOT scene coordinates; use the inverse mapping
+// to aim a synthetic event at an unscaled scene point deterministically.
+QPoint view_pos_for_unscaled_point(olive::TimeBasedView *view, const QPointF &p)
+{
+	return view->mapFromScene(view->scale_point(p));
+}
+
+// Renders a widget into a fresh image so two states can be compared
+// pixel-for-pixel without needing the window to be exposed
+QImage render_widget(QWidget *w)
+{
+	QImage img(w->size(), QImage::Format_ARGB32);
+	img.fill(Qt::transparent);
+	w->render(&img);
+	return img;
+}
+
+} // namespace
+
+TEST(TimeScaledObject, DefaultsAreUnitScaleAndNullTimebase)
+{
+	olive::TimelineScaledWidget w;
+	EXPECT_DOUBLE_EQ(w.get_scale(), 1.0);
+	EXPECT_TRUE(w.timebase().isNull());
+	// NB: timebase_dbl() is only meaningful after set_timebase(); the
+	// constructor leaves it uninitialized, so it is not asserted here
+	EXPECT_GT(w.get_maximum_scale(), 1.0);
+}
+
+TEST(TimeScaledObject, SetTimebaseCachesDoubleAndFiresEvent)
+{
+	ProbeScaledObject o;
+	o.set_timebase(olive::Rational(1, 30));
+
+	EXPECT_EQ(o.timebase(), olive::Rational(1, 30));
+	EXPECT_NEAR(o.timebase_dbl(), 1.0 / 30.0, 1e-12);
+	EXPECT_EQ(o.timebase_events, 1);
+	EXPECT_EQ(o.last_timebase, olive::Rational(1, 30));
+
+	o.set_timebase(olive::Rational(1, 24));
+	EXPECT_EQ(o.timebase_events, 2);
+	EXPECT_NEAR(o.timebase_dbl(), 1.0 / 24.0, 1e-12);
+}
+
+TEST(TimeScaledObject, ScaleClampsToMinimumAndMaximum)
+{
+	ProbeScaledObject o;
+	o.pub_set_minimum_scale(0.5);
+	o.pub_set_maximum_scale(10.0);
+
+	// Default scale (1.0) is inside the new limits, so no clamp event yet
+	EXPECT_DOUBLE_EQ(o.get_scale(), 1.0);
+
+	o.set_scale(100.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 10.0);
+	EXPECT_DOUBLE_EQ(o.last_scale, 10.0);
+
+	o.set_scale(0.01);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 0.5);
+	EXPECT_DOUBLE_EQ(o.last_scale, 0.5);
+
+	o.set_scale(2.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 2.0);
+	EXPECT_EQ(o.scale_events, 3);
+}
+
+TEST(TimeScaledObject, ShrinkingLimitsPullScaleIntoRange)
+{
+	ProbeScaledObject o;
+	o.set_scale(5.0);
+
+	// Lowering the maximum below the current scale clamps the scale down
+	o.pub_set_maximum_scale(2.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 2.0);
+
+	// Raising the minimum above the current scale pushes the scale up
+	o.pub_set_maximum_scale(100.0);
+	o.pub_set_minimum_scale(4.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 4.0);
+}
+
+TEST(TimeScaledObject, InvertedLimitsNeverBreakScaleClamp)
+{
+	ProbeScaledObject o;
+	o.set_scale(5.0);
+
+	// Narrow the valid range to [2, 3]
+	o.pub_set_maximum_scale(3.0);
+	o.pub_set_minimum_scale(2.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 3.0);
+
+	// Raising the minimum past the maximum pulls the maximum up with it, so
+	// the scale lands exactly on the new minimum instead of hitting an
+	// inverted std::clamp (undefined behavior)
+	o.pub_set_minimum_scale(10.0);
+	EXPECT_DOUBLE_EQ(o.get_maximum_scale(), 10.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 10.0);
+
+	// Lowering the maximum past the minimum pushes the minimum down instead
+	o.pub_set_maximum_scale(4.0);
+	EXPECT_DOUBLE_EQ(o.get_maximum_scale(), 4.0);
+	EXPECT_DOUBLE_EQ(o.get_scale(), 4.0);
+}
+
+TEST(TimeScaledObject, TimeToSceneScalesTime)
+{
+	olive::TimelineScaledWidget w;
+
+	// Null timebase maps everything to zero
+	EXPECT_DOUBLE_EQ(w.time_to_scene(olive::Rational(10)), 0.0);
+
+	w.set_timebase(olive::Rational(1, 30));
+	w.set_scale(30.0);
+
+	// time_to_scene is time in seconds multiplied by the scale
+	EXPECT_DOUBLE_EQ(w.time_to_scene(olive::Rational(1, 30)), 1.0);
+	EXPECT_DOUBLE_EQ(w.time_to_scene(olive::Rational(2)), 60.0);
+}
+
+TEST(TimeScaledObject, SceneToTimeFloorsCeilsAndRounds)
+{
+	olive::TimelineScaledWidget w;
+	w.set_timebase(olive::Rational(1, 30));
+	w.set_scale(30.0);
+
+	// 45.5 px / 30 px-per-frame = 45.5 frames
+	// floor for positive, ceil for negative, nearest when rounding
+	EXPECT_EQ(w.scene_to_time(45.5), olive::Rational(45, 30));
+	EXPECT_EQ(w.scene_to_time(-10.5), olive::Rational(-10, 30));
+	EXPECT_EQ(w.scene_to_time(45.5, true), olive::Rational(46, 30));
+
+	// Exact grid points map exactly
+	EXPECT_EQ(w.scene_to_time(60.0), olive::Rational(2));
+
+	// Null timebase always yields a null time
+	olive::TimelineScaledWidget null_tb;
+	EXPECT_TRUE(null_tb.scene_to_time(123.0).isNull());
+	EXPECT_TRUE(
+		olive::TimeScaledObject::scene_to_time(10.0, 1.0, olive::Rational())
+			.isNull());
+}
+
+TEST(TimeScaledObject, SceneToTimeNoGridIgnoresTimebase)
+{
+	// Static form is a pure scale division
+	const olive::Rational r =
+		olive::TimeScaledObject::scene_to_time_no_grid(3.0, 2.0);
+	EXPECT_NEAR(r.to_double(), 1.5, 1e-9);
+
+	// The instance form with a null timebase divides by the current scale
+	olive::TimelineScaledWidget w;
+	w.set_scale(2.0);
+	EXPECT_NEAR(w.scene_to_time_no_grid(3.0).to_double(), 1.5, 1e-9);
+
+	// A set timebase does not affect the no-grid conversion
+	w.set_timebase(olive::Rational(1, 30));
+	EXPECT_NEAR(w.scene_to_time_no_grid(3.0).to_double(), 1.5, 1e-9);
+}
+
+TEST(TimeScaledObject, ScaleFromDimensionsMath)
+{
+	// (viewport / 10 * 9) / content
+	EXPECT_DOUBLE_EQ(
+		olive::TimeScaledObject::calculate_scale_from_dimensions(1000, 500),
+		1.8);
+	EXPECT_DOUBLE_EQ(
+		olive::TimeScaledObject::calculate_padding_from_dimension_scale(100),
+		5.0);
+
+	olive::TimelineScaledWidget w;
+	w.set_scale_from_dimensions(1000, 500);
+	EXPECT_DOUBLE_EQ(w.get_scale(), 1.8);
+}
+
+TEST(TimeBasedView, ConstructionDefaults)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	EXPECT_DOUBLE_EQ(view.get_scale(), 1.0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 1.0);
+	EXPECT_FALSE(view.is_snapped());
+	EXPECT_EQ(view.get_snap_service(), nullptr);
+	EXPECT_EQ(view.get_viewer_node(), nullptr);
+	EXPECT_FALSE(view.is_dragging_playhead());
+	EXPECT_EQ(view.dragMode(), QGraphicsView::NoDrag);
+	EXPECT_NE(view.scene(), nullptr);
+}
+
+TEST(TimeBasedView, SnapEnableDisableTogglesState)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	view.enable_snap({ olive::Rational(1), olive::Rational(2) });
+	EXPECT_TRUE(view.is_snapped());
+
+	view.disable_snap();
+	EXPECT_FALSE(view.is_snapped());
+}
+
+TEST(TimeBasedView, YScaleEventOnlyFiresWhenAxisEnabled)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+
+	// Y axis disabled: the value is stored but no event fires
+	view.set_y_scale(2.0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 2.0);
+	EXPECT_EQ(view.y_scale_events, 0);
+
+	view.pub_set_y_axis_enabled(true);
+	view.set_y_scale(3.0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 3.0);
+	EXPECT_EQ(view.y_scale_events, 1);
+	EXPECT_DOUBLE_EQ(view.last_y_scale, 3.0);
+}
+
+TEST(TimeBasedView, ScalePointAndUnscalePointAreInverses)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	view.set_scale(2.0);
+	view.set_y_scale(4.0);
+
+	const QPointF scaled = view.scale_point(QPointF(1.5, 0.5));
+	EXPECT_DOUBLE_EQ(scaled.x(), 3.0);
+	EXPECT_DOUBLE_EQ(scaled.y(), 2.0);
+
+	const QPointF unscaled = view.unscale_point(scaled);
+	EXPECT_DOUBLE_EQ(unscaled.x(), 1.5);
+	EXPECT_DOUBLE_EQ(unscaled.y(), 0.5);
+}
+
+TEST(TimeBasedView, EndTimeDrivesSceneRectRightEdge)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	view.resize(400, 300);
+	view.set_timebase(olive::Rational(1, 30));
+	view.set_scale(100.0);
+	view.set_end_time(olive::Rational(10));
+
+	// update_scene_rect pins the left edge to zero and puts the right edge
+	// one viewport width past the end of the content
+	QRectF rect = view.scene()->sceneRect();
+	EXPECT_DOUBLE_EQ(rect.left(), 0.0);
+	EXPECT_DOUBLE_EQ(rect.right(), 10.0 * 100.0 + view.width());
+
+	// Changing the scale re-runs update_scene_rect
+	view.set_scale(200.0);
+	rect = view.scene()->sceneRect();
+	EXPECT_DOUBLE_EQ(rect.right(), 10.0 * 200.0 + view.width());
+}
+
+TEST(TimeBasedView, ZoomWithoutYAxisEmitsHorizontalScaleChange)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	view.resize(400, 300);
+	QSignalSpy spy(&view, &olive::TimeBasedView::scale_changed);
+
+	QWheelEvent wheel(QPointF(10, 10), QPointF(10, 10), QPoint(),
+					  QPoint(0, 120), Qt::NoButton, Qt::NoModifier,
+					  Qt::NoScrollPhase, false);
+	view.pub_zoom(&wheel, 2.0, QPointF(10, 10));
+
+	// The view only emits the requested scale; applying it is up to the
+	// parent widget, so the stored scale is unchanged
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_DOUBLE_EQ(spy.first().first().toDouble(), 2.0);
+	EXPECT_DOUBLE_EQ(view.get_scale(), 1.0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 1.0);
+}
+
+TEST(TimeBasedView, ZoomWithYAxisAndShiftOnlyScalesVertically)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	view.resize(400, 300);
+	view.pub_set_y_axis_enabled(true);
+	QSignalSpy spy(&view, &olive::TimeBasedView::scale_changed);
+
+	// Shift (without Alt) restricts the zoom to the vertical axis
+	QWheelEvent wheel(QPointF(10, 10), QPointF(10, 10), QPoint(),
+					  QPoint(0, 120), Qt::NoButton, Qt::ShiftModifier,
+					  Qt::NoScrollPhase, false);
+	view.pub_zoom(&wheel, 2.0, QPointF(10, 10));
+
+	EXPECT_EQ(spy.count(), 0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 2.0);
+	EXPECT_EQ(view.y_scale_events, 1);
+}
+
+TEST(TimeBasedView, ZoomWithYAxisShiftAndAltOnlyScalesHorizontally)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	view.resize(400, 300);
+	view.pub_set_y_axis_enabled(true);
+	QSignalSpy spy(&view, &olive::TimeBasedView::scale_changed);
+
+	QWheelEvent wheel(QPointF(10, 10), QPointF(10, 10), QPoint(),
+					  QPoint(0, 120), Qt::NoButton,
+					  Qt::ShiftModifier | Qt::AltModifier, Qt::NoScrollPhase,
+					  false);
+	view.pub_zoom(&wheel, 2.0, QPointF(10, 10));
+
+	ASSERT_EQ(spy.count(), 1);
+	EXPECT_DOUBLE_EQ(spy.first().first().toDouble(), 2.0);
+	EXPECT_DOUBLE_EQ(view.get_y_scale(), 1.0);
+	EXPECT_EQ(view.y_scale_events, 0);
+}
+
+TEST(TimeBasedView, PlayheadDragRequiresPaintedPlayheadRect)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	view.resize(400, 300);
+
+	// The playhead hit rect is only populated by drawForeground; before any
+	// paint the rect is empty and nothing can grab the playhead
+	QMouseEvent press = make_press(QPointF(50, 50), Qt::LeftButton);
+	EXPECT_FALSE(view.pub_playhead_press(&press));
+	EXPECT_FALSE(view.is_dragging_playhead());
+
+	// Move/release are no-ops without an active drag
+	QMouseEvent move(QEvent::MouseMove, QPointF(60, 50), QPointF(60, 50),
+					 QPointF(60, 50), Qt::NoButton, Qt::LeftButton,
+					 Qt::NoModifier);
+	EXPECT_FALSE(view.pub_playhead_move(&move));
+
+	QMouseEvent release(QEvent::MouseButtonRelease, QPointF(60, 50),
+						QPointF(60, 50), QPointF(60, 50), Qt::LeftButton,
+						Qt::NoButton, Qt::NoModifier);
+	EXPECT_FALSE(view.pub_playhead_release(&release));
+}
+
+TEST(TimeBasedView, SetViewerNodeStoresAndClears)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	auto *viewer = new olive::ViewerOutput();
+	OakEngineNode *handle = reinterpret_cast<OakEngineNode *>(viewer);
+
+	view.set_viewer_node(handle);
+	EXPECT_EQ(view.get_viewer_node(), handle);
+
+	view.set_viewer_node(nullptr);
+	EXPECT_EQ(view.get_viewer_node(), nullptr);
+
+	delete viewer;
+}
+
+TEST(TimeBasedViewSelectionManager, SelectDeselectSemantics)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable a, b;
+	EXPECT_TRUE(mgr.get_selected_objects().empty());
+
+	EXPECT_TRUE(mgr.select(&a));
+	EXPECT_TRUE(mgr.is_selected(&a));
+	EXPECT_FALSE(mgr.is_selected(&b));
+
+	// Re-selecting an already selected object is a no-op
+	EXPECT_FALSE(mgr.select(&a));
+	EXPECT_EQ(mgr.get_selected_objects().size(), 1u);
+
+	EXPECT_TRUE(mgr.select(&b));
+	EXPECT_EQ(mgr.get_selected_objects().size(), 2u);
+
+	EXPECT_TRUE(mgr.deselect(&a));
+	EXPECT_FALSE(mgr.is_selected(&a));
+
+	// Deselecting something not selected reports failure
+	EXPECT_FALSE(mgr.deselect(&a));
+
+	mgr.clear_selection();
+	EXPECT_TRUE(mgr.get_selected_objects().empty());
+	EXPECT_FALSE(mgr.is_selected(&b));
+}
+
+TEST(TimeBasedViewSelectionManager, ObjectAtPointPrefersLastDrawn)
+{
+	ensure_core();
+
+	olive::TimeBasedView view; // scale 1.0, y scale 1.0: scene == unscaled
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable bottom, top;
+	mgr.declare_drawn_object(&bottom, QRectF(0, 0, 100, 100));
+	mgr.declare_drawn_object(&top, QRectF(50, 50, 100, 100));
+
+	// In the overlap the object drawn later (i.e. on top) wins
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(75, 75)), &top);
+	// Outside the overlap the bottom object is hit
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(25, 25)), &bottom);
+	// A complete miss returns nullptr
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(500, 500)), nullptr);
+
+	mgr.clear_drawn_objects();
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(25, 25)), nullptr);
+}
+
+TEST(TimeBasedViewSelectionManager, ObjectAtPointMatchesDeclaredRectBounds)
+{
+	ensure_core();
+
+	olive::TimeBasedView view; // scale 1.0, y scale 1.0: scene == unscaled
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable item;
+	mgr.declare_drawn_object(&item, QRectF(10, 10, 30, 30));
+
+	// The rect spans scene coordinates [10, 40] on both axes
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(10, 10)), &item);
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(40, 40)), &item);
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(41, 41)), nullptr);
+	EXPECT_EQ(mgr.get_object_at_point(QPointF(9, 20)), nullptr);
+}
+
+TEST(TimeBasedViewSelectionManager, MousePressSelectsAndClears)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable item;
+	mgr.declare_drawn_object(&item, QRectF(10, 10, 20, 20));
+
+	// Left click on the object selects it and notifies the view
+	QMouseEvent hit = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(15, 15)), Qt::LeftButton);
+	EXPECT_EQ(mgr.mouse_press(&hit), &item);
+	EXPECT_TRUE(mgr.is_selected(&item));
+	ASSERT_EQ(view.select_events.size(), 1u);
+	EXPECT_EQ(view.select_events.at(0), &item);
+
+	// Left click on empty space clears the selection and returns nothing
+	QMouseEvent miss = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(300, 300)), Qt::LeftButton);
+	EXPECT_EQ(mgr.mouse_press(&miss), nullptr);
+	EXPECT_TRUE(mgr.get_selected_objects().empty());
+
+	// Right click also selects
+	QMouseEvent right = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(15, 15)), Qt::RightButton);
+	EXPECT_EQ(mgr.mouse_press(&right), &item);
+	EXPECT_TRUE(mgr.is_selected(&item));
+}
+
+TEST(TimeBasedViewSelectionManager, ShiftClickTogglesWithoutClearing)
+{
+	ensure_core();
+
+	ProbeTimeBasedView view;
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable a, b;
+	mgr.declare_drawn_object(&a, QRectF(10, 10, 20, 20));
+	mgr.declare_drawn_object(&b, QRectF(100, 100, 20, 20));
+
+	// Plain click selects a
+	QMouseEvent press_a = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(15, 15)), Qt::LeftButton);
+	mgr.mouse_press(&press_a);
+	ASSERT_TRUE(mgr.is_selected(&a));
+
+	// Shift-click on b adds it without clearing a
+	QMouseEvent shift_b =
+		make_press(view_pos_for_unscaled_point(&view, QPointF(105, 105)),
+				   Qt::LeftButton, Qt::ShiftModifier);
+	EXPECT_EQ(mgr.mouse_press(&shift_b), &b);
+	EXPECT_TRUE(mgr.is_selected(&a));
+	EXPECT_TRUE(mgr.is_selected(&b));
+
+	// Shift-click on the already-selected a deselects it and reports no
+	// object under the cursor
+	QMouseEvent shift_a =
+		make_press(view_pos_for_unscaled_point(&view, QPointF(15, 15)),
+				   Qt::LeftButton, Qt::ShiftModifier);
+	EXPECT_EQ(mgr.mouse_press(&shift_a), nullptr);
+	EXPECT_FALSE(mgr.is_selected(&a));
+	EXPECT_TRUE(mgr.is_selected(&b));
+	ASSERT_EQ(view.deselect_events.size(), 1u);
+	EXPECT_EQ(view.deselect_events.at(0), &a);
+}
+
+TEST(TimeBasedViewSelectionManager, RubberBandSelectsIntersectingObjects)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	view.resize(400, 300);
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable inside, outside;
+	mgr.declare_drawn_object(&inside, QRectF(10, 10, 20, 20));
+	mgr.declare_drawn_object(&outside, QRectF(300, 300, 20, 20));
+
+	EXPECT_FALSE(mgr.is_rubber_banding());
+
+	QMouseEvent press = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(0, 0)), Qt::LeftButton);
+	mgr.rubber_band_start(&press);
+	EXPECT_TRUE(mgr.is_rubber_banding());
+
+	mgr.rubber_band_move(view_pos_for_unscaled_point(&view, QPointF(100, 100)));
+	EXPECT_TRUE(mgr.is_selected(&inside));
+	EXPECT_FALSE(mgr.is_selected(&outside));
+
+	mgr.rubber_band_stop();
+	EXPECT_FALSE(mgr.is_rubber_banding());
+
+	// Stopping twice is harmless
+	mgr.rubber_band_stop();
+}
+
+TEST(TimeBasedViewSelectionManager, RubberBandKeepsPreselection)
+{
+	ensure_core();
+
+	olive::TimeBasedView view;
+	view.resize(400, 300);
+	olive::TimeBasedViewSelectionManager<FakeSelectable> mgr(&view);
+
+	FakeSelectable pre, banded;
+	mgr.declare_drawn_object(&pre, QRectF(300, 300, 20, 20));
+	mgr.declare_drawn_object(&banded, QRectF(10, 10, 20, 20));
+	mgr.select(&pre);
+
+	QMouseEvent press = make_press(
+		view_pos_for_unscaled_point(&view, QPointF(0, 0)), Qt::LeftButton);
+	mgr.rubber_band_start(&press);
+	mgr.rubber_band_move(view_pos_for_unscaled_point(&view, QPointF(100, 100)));
+
+	// Objects selected before the band started stay selected
+	EXPECT_TRUE(mgr.is_selected(&pre));
+	EXPECT_TRUE(mgr.is_selected(&banded));
+
+	mgr.rubber_band_stop();
+}
+
+TEST(TimeTargetObject, DefaultsToNullTarget)
+{
+	olive::TimeTargetObject target;
+	EXPECT_EQ(target.get_time_target(), nullptr);
+}
+
+TEST(TimeTargetObject, SetTimeTargetFiresEventSequence)
+{
+	auto *node_a = new olive::ViewerOutput();
+	auto *node_b = new olive::ViewerOutput();
+	OakEngineNode *handle_a = reinterpret_cast<OakEngineNode *>(node_a);
+	OakEngineNode *handle_b = reinterpret_cast<OakEngineNode *>(node_b);
+
+	ProbeTimeTarget target;
+
+	// null -> a: changed + connect, no disconnect
+	target.set_time_target(handle_a);
+	EXPECT_EQ(target.get_time_target(), handle_a);
+	EXPECT_TRUE(target.disconnected.empty());
+	ASSERT_EQ(target.changed.size(), 1u);
+	EXPECT_EQ(target.changed.at(0), handle_a);
+	ASSERT_EQ(target.connected.size(), 1u);
+	EXPECT_EQ(target.connected.at(0), handle_a);
+
+	// a -> b: disconnect(a), changed(b), connect(b)
+	target.set_time_target(handle_b);
+	ASSERT_EQ(target.disconnected.size(), 1u);
+	EXPECT_EQ(target.disconnected.at(0), handle_a);
+	ASSERT_EQ(target.changed.size(), 2u);
+	EXPECT_EQ(target.changed.at(1), handle_b);
+	ASSERT_EQ(target.connected.size(), 2u);
+	EXPECT_EQ(target.connected.at(1), handle_b);
+
+	// b -> null: disconnect(b), changed(null), no connect
+	target.set_time_target(nullptr);
+	EXPECT_EQ(target.get_time_target(), nullptr);
+	ASSERT_EQ(target.disconnected.size(), 2u);
+	EXPECT_EQ(target.disconnected.at(1), handle_b);
+	ASSERT_EQ(target.changed.size(), 3u);
+	EXPECT_EQ(target.changed.at(2), nullptr);
+	EXPECT_EQ(target.connected.size(), 2u);
+
+	delete node_a;
+	delete node_b;
+}
+
+TEST(TimeTargetObject, AdjustedTimePassesThroughWhenEitherNodeIsNull)
+{
+	auto *node = new olive::ViewerOutput();
+	OakEngineNode *handle = reinterpret_cast<OakEngineNode *>(node);
+
+	olive::TimeTargetObject target;
+	target.set_path_index(1);
+
+	// Null source returns the input unchanged
+	EXPECT_EQ(target.get_adjusted_time(nullptr, handle, olive::Rational(5),
+									   olive::k_transform_towards_output),
+			  olive::Rational(5));
+
+	// Null target returns the input unchanged
+	EXPECT_EQ(target.get_adjusted_time(handle, nullptr, olive::Rational(7),
+									   olive::k_transform_towards_input),
+			  olive::Rational(7));
+
+	// Same for the TimeRange overload
+	const olive::TimeRange range(olive::Rational(2), olive::Rational(9));
+	const olive::TimeRange out = target.get_adjusted_time(
+		nullptr, nullptr, range, olive::k_transform_towards_output);
+	EXPECT_EQ(out.in(), olive::Rational(2));
+	EXPECT_EQ(out.out(), olive::Rational(9));
+
+	delete node;
+}
+
+TEST(ResizableTimelineScrollBar, ConstructionDefaults)
+{
+	olive::ResizableTimelineScrollBar bar;
+	EXPECT_EQ(bar.orientation(), Qt::Vertical);
+	EXPECT_EQ(bar.singleStep(), 20); // inherited from ResizableScrollBar
+	EXPECT_DOUBLE_EQ(bar.get_scale(), 1.0); // TimeScaledObject base
+	EXPECT_TRUE(bar.timebase().isNull());
+
+	olive::ResizableTimelineScrollBar hbar(Qt::Horizontal);
+	EXPECT_EQ(hbar.orientation(), Qt::Horizontal);
+}
+
+TEST(ResizableTimelineScrollBar, NullConnectionsAreSafe)
+{
+	olive::ResizableTimelineScrollBar bar(Qt::Horizontal);
+	bar.connect_markers(nullptr);
+	bar.connect_work_area(nullptr);
+	bar.SetScale(2.0);
+
+	// Disconnecting when nothing was ever connected is equally safe
+	bar.connect_markers(nullptr);
+	bar.connect_work_area(nullptr);
+}
+
+TEST(ResizableTimelineScrollBar, EnabledWorkAreaChangesPaintedPixels)
+{
+	olive::ResizableTimelineScrollBar bar(Qt::Horizontal);
+	bar.resize(400, 20);
+	bar.set_timebase(olive::Rational(1, 30));
+	bar.set_scale(10.0);
+
+	olive::TimelineWorkArea workarea; // disabled by default
+	auto *handle = reinterpret_cast<OakEngineWorkarea *>(&workarea);
+	bar.connect_work_area(handle);
+	oakengine_workarea_set_range(handle, 1, 1, 10, 1);
+
+	const QImage disabled = render_widget(&bar);
+
+	oakengine_workarea_set_enabled(handle, 1);
+	const QImage enabled = render_widget(&bar);
+	EXPECT_NE(disabled, enabled);
+
+	// Disabling again restores the base scrollbar paint exactly
+	oakengine_workarea_set_enabled(handle, 0);
+	EXPECT_EQ(render_widget(&bar), disabled);
+
+	// Disconnecting the workarea also restores it while the workarea is on
+	oakengine_workarea_set_enabled(handle, 1);
+	bar.connect_work_area(nullptr);
+	EXPECT_EQ(render_widget(&bar), disabled);
+}
+
+TEST(ResizableTimelineScrollBar, MarkersChangePaintedPixels)
+{
+	olive::ResizableTimelineScrollBar bar(Qt::Horizontal);
+	bar.resize(400, 20);
+	bar.set_timebase(olive::Rational(1, 30));
+	bar.set_scale(10.0);
+
+	const QImage clean = render_widget(&bar);
+
+	olive::TimelineMarkerList list;
+	auto *list_handle = reinterpret_cast<OakEngineMarkerList *>(&list);
+	bar.connect_markers(list_handle);
+
+	// Parenting a marker to the list registers it through the list's
+	// childEvent
+	auto *marker = new olive::TimelineMarker(
+		0, olive::TimeRange(olive::Rational(2), olive::Rational(5)),
+		QStringLiteral("m"), &list);
+	ASSERT_EQ(oakengine_marker_list_count(list_handle), 1);
+
+	const QImage with_marker = render_widget(&bar);
+	EXPECT_NE(clean, with_marker);
+
+	// Removing the marker restores the base paint. NB: the list only
+	// unregisters a marker on ChildRemoved, which must arrive while the
+	// marker is still fully constructed (its childEvent dynamic_casts the
+	// child to TimelineMarker), so reparent before deleting — the same
+	// order MarkerRemoveCommand uses.
+	marker->setParent(nullptr);
+	delete marker;
+	EXPECT_EQ(render_widget(&bar), clean);
+
+	// Disconnecting the list with a marker present also restores it
+	auto *marker2 = new olive::TimelineMarker(
+		0, olive::TimeRange(olive::Rational(2), olive::Rational(5)),
+		QStringLiteral("m2"), &list);
+	bar.connect_markers(nullptr);
+	EXPECT_EQ(render_widget(&bar), clean);
+	delete marker2;
+}
+

tests/gtest/widget_viewer2_test.cpp

@@ -0,0 +1,781 @@
+#include <gtest/gtest.h>
+
+#include <QApplication>
+#include <QCloseEvent>
+#include <QFontComboBox>
+#include <QFontDatabase>
+#include <QTextCursor>
+#include <QImage>
+#include <QMatrix4x4>
+#include <QMouseEvent>
+#include <QPainter>
+#include <QPaintEvent>
+#include <QPointer>
+#include <QPushButton>
+#include <QScrollBar>
+#include <QSignalSpy>
+#include <QTest>
+
+#include "node/output/viewer/viewer.h"
+#include "node/project/footage/footage.h"
+#include "node/project/sequence/sequence.h"
+#include "render/videoparams.h"
+#include "widget/viewer/displaybuffer.h"
+#include "widget/viewer/vieweroutpututils.h"
+#include "widget/viewer/viewerplaybacktimer.h"
+#include "widget/viewer/viewerpreventsleep.h"
+#include "widget/viewer/viewersizer.h"
+#include "widget/viewer/viewertexteditor.h"
+
+namespace
+{
+
+// ViewerSizer's scrollbars are created in a fixed order (horizontal first),
+// and findChildren preserves child creation order
+QList<QScrollBar *> sizer_scrollbars(olive::ViewerSizer *sizer)
+{
+	return sizer->findChildren<QScrollBar *>();
+}
+
+// ViewerTextEditorToolBar push buttons in creation order (see
+// viewertexteditor.cpp): underline, strikethrough, color, align left/center/
+// right/justify, align top/middle/bottom, small caps
+QList<QPushButton *> toolbar_buttons(olive::ViewerTextEditorToolBar *toolbar)
+{
+	return toolbar->findChildren<QPushButton *>();
+}
+
+enum ToolBarButton {
+	k_underline = 0,
+	k_strikethrough = 1,
+	k_color = 2,
+	k_align_left = 3,
+	k_align_center = 4,
+	k_align_right = 5,
+	k_align_justify = 6,
+	k_align_top = 7,
+	k_align_middle = 8,
+	k_align_bottom = 9,
+	k_small_caps = 10,
+};
+
+QMatrix4x4 last_matrix(QSignalSpy &spy)
+{
+	return spy.last().first().value<QMatrix4x4>();
+}
+
+} // namespace
+
+TEST(ViewerSizer, ScrollBarsStartHiddenAndZoomIsFit)
+{
+	olive::ViewerSizer sizer;
+	const auto bars = sizer_scrollbars(&sizer);
+	ASSERT_EQ(bars.size(), 2);
+	EXPECT_EQ(bars.at(0)->orientation(), Qt::Horizontal);
+	EXPECT_EQ(bars.at(1)->orientation(), Qt::Vertical);
+	EXPECT_FALSE(bars.at(0)->isVisibleTo(&sizer));
+	EXPECT_FALSE(bars.at(1)->isVisibleTo(&sizer));
+}
+
+TEST(ViewerSizer, ZeroChildSizeFillsContainerWithoutScaleRequest)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(400, 300);
+
+	auto *child = new QWidget();
+	sizer.set_widget(child);
+
+	QSignalSpy scale_spy(&sizer, &olive::ViewerSizer::request_scale);
+
+	// width_/height_ default to 0, so the child simply fills the container
+	EXPECT_EQ(child->geometry(), QRect(0, 0, 400, 300));
+	EXPECT_EQ(scale_spy.count(), 0);
+}
+
+TEST(ViewerSizer, SetWidgetDestroysPreviousWidget)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(200, 200);
+
+	QPointer<QWidget> first = new QWidget();
+	sizer.set_widget(first);
+	ASSERT_FALSE(first.isNull());
+	EXPECT_EQ(first->parentWidget(), &sizer);
+
+	auto *second = new QWidget();
+	sizer.set_widget(second);
+
+	// set_widget() deletes the previously installed widget
+	EXPECT_TRUE(first.isNull());
+	EXPECT_EQ(second->parentWidget(), &sizer);
+}
+
+TEST(ViewerSizer, WideContainerScalesByHeight)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(400, 300);
+	sizer.set_widget(new QWidget());
+
+	QSignalSpy scale_spy(&sizer, &olive::ViewerSizer::request_scale);
+
+	// Square image in a 4:3 container: container is wider, so the matrix
+	// compresses X by sequence_aspect / container_aspect = 1 / (4/3)
+	sizer.set_child_size(100, 100);
+
+	ASSERT_GE(scale_spy.count(), 1);
+	const QMatrix4x4 m = last_matrix(scale_spy);
+	EXPECT_NEAR(m(0, 0), 0.75, 1e-9);
+	EXPECT_NEAR(m(1, 1), 1.0, 1e-9);
+}
+
+TEST(ViewerSizer, TallContainerScalesByWidth)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(300, 300);
+	sizer.set_widget(new QWidget());
+
+	QSignalSpy scale_spy(&sizer, &olive::ViewerSizer::request_scale);
+
+	// 2:1 image in a square container: container is taller, so the matrix
+	// compresses Y by container_aspect / sequence_aspect = 1 / 2
+	sizer.set_child_size(200, 100);
+
+	ASSERT_GE(scale_spy.count(), 1);
+	const QMatrix4x4 m = last_matrix(scale_spy);
+	EXPECT_NEAR(m(0, 0), 1.0, 1e-9);
+	EXPECT_NEAR(m(1, 1), 0.5, 1e-9);
+}
+
+TEST(ViewerSizer, PixelAspectRatioFactorsIntoScale)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(300, 300);
+	sizer.set_widget(new QWidget());
+	sizer.set_child_size(100, 100);
+
+	QSignalSpy scale_spy(&sizer, &olive::ViewerSizer::request_scale);
+
+	// 2:1 pixel aspect doubles the sequence aspect -> 2:1 in a square container
+	sizer.set_pixel_aspect_ratio(olive::Rational(2, 1));
+	ASSERT_GE(scale_spy.count(), 1);
+	QMatrix4x4 m = last_matrix(scale_spy);
+	EXPECT_NEAR(m(0, 0), 1.0, 1e-9);
+	EXPECT_NEAR(m(1, 1), 0.5, 1e-9);
+
+	// 1:2 pixel aspect halves it -> 1:2 image, container wider than image
+	sizer.set_pixel_aspect_ratio(olive::Rational(1, 2));
+	m = last_matrix(scale_spy);
+	EXPECT_NEAR(m(0, 0), 0.5, 1e-9);
+	EXPECT_NEAR(m(1, 1), 1.0, 1e-9);
+}
+
+TEST(ViewerSizer, ExplicitZoomShowsScrollBars)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(200, 200);
+	sizer.set_widget(new QWidget());
+	sizer.set_child_size(100, 100);
+	sizer.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&sizer));
+
+	const auto bars = sizer_scrollbars(&sizer);
+	ASSERT_EQ(bars.size(), 2);
+
+	QSignalSpy scale_spy(&sizer, &olive::ViewerSizer::request_scale);
+
+	// 100px child at 400% is 400px > 200px container, so both bars appear
+	sizer.set_zoom(4.0);
+	EXPECT_TRUE(bars.at(0)->isVisible());
+	EXPECT_TRUE(bars.at(1)->isVisible());
+
+	// The zoom is folded into the requested scale on top of the fit scale
+	ASSERT_GE(scale_spy.count(), 1);
+	const QMatrix4x4 m = last_matrix(scale_spy);
+	EXPECT_GT(m(0, 0), 1.0);
+	EXPECT_GT(m(1, 1), 1.0);
+
+	// Back to fit: scrollbars disappear again
+	sizer.set_zoom(-1);
+	EXPECT_FALSE(bars.at(0)->isVisible());
+	EXPECT_FALSE(bars.at(1)->isVisible());
+}
+
+TEST(ViewerSizer, ScrollBarMovementEmitsTranslate)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(200, 200);
+	sizer.set_widget(new QWidget());
+	sizer.set_child_size(100, 100);
+	sizer.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&sizer));
+	sizer.set_zoom(4.0);
+
+	const auto bars = sizer_scrollbars(&sizer);
+	ASSERT_EQ(bars.size(), 2);
+	QScrollBar *horiz = bars.at(0);
+	ASSERT_TRUE(horiz->isVisible());
+	ASSERT_GT(horiz->maximum(), 0);
+
+	QSignalSpy translate_spy(&sizer, &olive::ViewerSizer::request_translate);
+
+	// Scrolled to the far right the offset is negative. Go to the maximum
+	// first so the subsequent setValue(0) is a real change (QScrollBar only
+	// emits valueChanged, which drives scroll_bar_moved, on actual changes)
+	horiz->setValue(horiz->maximum());
+	ASSERT_GE(translate_spy.count(), 1);
+	const float at_max = last_matrix(translate_spy)(0, 3);
+	EXPECT_LT(at_max, 0.0f);
+
+	// Back at 0 the view centers on the left edge: positive X offset
+	translate_spy.clear();
+	horiz->setValue(0);
+	ASSERT_GE(translate_spy.count(), 1);
+	const float at_min = last_matrix(translate_spy)(0, 3);
+	EXPECT_GT(at_min, 0.0f);
+}
+
+TEST(ViewerSizer, HandDragMoveAdjustsVisibleScrollBars)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(200, 200);
+	sizer.set_widget(new QWidget());
+	sizer.set_child_size(100, 100);
+	sizer.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&sizer));
+	sizer.set_zoom(4.0);
+
+	const auto bars = sizer_scrollbars(&sizer);
+	ASSERT_EQ(bars.size(), 2);
+	bars.at(0)->setValue(50);
+	bars.at(1)->setValue(30);
+
+	// A drag of (+10, +5) pulls the content, decreasing both scroll values
+	sizer.hand_drag_move(10, 5);
+	EXPECT_EQ(bars.at(0)->value(), 40);
+	EXPECT_EQ(bars.at(1)->value(), 25);
+}
+
+TEST(ViewerSizer, AnchoredZoomOutToFitResetsScrollPositions)
+{
+	olive::ViewerSizer sizer;
+	sizer.resize(200, 200);
+	sizer.set_widget(new QWidget());
+	sizer.set_child_size(100, 100);
+	sizer.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&sizer));
+
+	const auto bars = sizer_scrollbars(&sizer);
+	ASSERT_EQ(bars.size(), 2);
+
+	sizer.set_zoom_anchored(4.0, 10.0, 10.0);
+	ASSERT_TRUE(bars.at(0)->isVisible());
+
+	// A non-positive anchored zoom is the "fit" command: zoom clears and the
+	// scroll offsets reset
+	sizer.set_zoom_anchored(0.0, 0.0, 0.0);
+	EXPECT_FALSE(bars.at(0)->isVisible());
+	EXPECT_FALSE(bars.at(1)->isVisible());
+	EXPECT_EQ(bars.at(0)->value(), 0);
+	EXPECT_EQ(bars.at(1)->value(), 0);
+}
+
+TEST(ViewerPlaybackTimer, ZeroSpeedKeepsStartTimestamp)
+{
+	olive::ViewerPlaybackTimer timer;
+	timer.start(42, 0, 1.0 / 30.0);
+
+	// No elapsed real time can move the timestamp when the speed is zero
+	EXPECT_EQ(timer.get_timestamp_now(), 42);
+}
+
+TEST(ViewerPlaybackTimer, HugeTimebaseFreezesFrameAdvance)
+{
+	olive::ViewerPlaybackTimer timer;
+	// 1000-second frames: any sub-second test run still rounds to zero frames
+	timer.start(7, 3, 1000.0);
+	EXPECT_EQ(timer.get_timestamp_now(), 7);
+}
+
+TEST(ViewerPlaybackTimer, NegativeSpeedAlsoStartsAtTimestamp)
+{
+	olive::ViewerPlaybackTimer timer;
+	timer.start(100, -2, 1000.0);
+	EXPECT_EQ(timer.get_timestamp_now(), 100);
+}
+
+TEST(ViewerPlaybackTimer, RestartReplacesAnchor)
+{
+	olive::ViewerPlaybackTimer timer;
+	timer.start(1, 0, 1.0 / 30.0);
+	EXPECT_EQ(timer.get_timestamp_now(), 1);
+
+	timer.start(500, 0, 1.0 / 30.0);
+	EXPECT_EQ(timer.get_timestamp_now(), 500);
+}
+
+TEST(ViewerPreventSleep, ToggleOnOffDoesNotCrash)
+{
+	// No observable state is exposed; on macOS this creates/releases an IOPM
+	// assertion, elsewhere it talks to the OS sleep-inhibit service. Toggling
+	// twice exercises the released-assertion no-op path.
+	olive::prevent_sleep(true);
+	olive::prevent_sleep(false);
+	olive::prevent_sleep(false);
+	SUCCEED();
+}
+
+TEST(DisplayBuffer, NullHandlesAreSafeToWrapAndDestroy)
+{
+	auto tex = olive::oak_make_shared_texture(nullptr);
+	EXPECT_EQ(tex->handle, nullptr);
+	EXPECT_EQ(tex->type, olive::OakSharedBuffer::k_texture);
+
+	auto frame = olive::oak_make_shared_frame(nullptr);
+	EXPECT_EQ(frame->handle, nullptr);
+	EXPECT_EQ(frame->type, olive::OakSharedBuffer::k_frame);
+
+	// Both facade free functions ignore nullptr, so destroying these is safe
+	tex.reset();
+	frame.reset();
+	SUCCEED();
+}
+
+TEST(DisplayBuffer, SharedCopiesExtendHandleLifetime)
+{
+	void *raw = oakengine_codec_frame_create();
+	ASSERT_NE(raw, nullptr);
+
+	auto frame = olive::oak_make_shared_frame(raw);
+	EXPECT_EQ(frame->handle, raw);
+	EXPECT_EQ(frame.use_count(), 1);
+
+	{
+		auto copy = frame;
+		EXPECT_EQ(frame.use_count(), 2);
+		EXPECT_EQ(copy->handle, raw);
+	}
+
+	// The copy is gone but the original still holds the handle
+	EXPECT_EQ(frame.use_count(), 1);
+}
+
+TEST(DisplayBuffer, RoundTripsThroughVariant)
+{
+	auto frame = olive::oak_make_shared_frame(nullptr);
+
+	QVariant v = QVariant::fromValue(frame);
+	EXPECT_TRUE(v.isValid());
+
+	const olive::OakSharedBufferPtr out = v.value<olive::OakSharedBufferPtr>();
+	EXPECT_EQ(out, frame);
+	EXPECT_EQ(out.use_count(), frame.use_count());
+}
+
+TEST(ViewerOutputUtils, NullViewerReturnsDefaults)
+{
+	const oak::VideoParams vp = olive::viewer_output_video_params(nullptr);
+	EXPECT_EQ(vp.width(), 0);
+	EXPECT_EQ(vp.height(), 0);
+	EXPECT_EQ(vp, olive::empty_video_params());
+
+	const olive::AudioParams ap = olive::viewer_output_audio_params(nullptr);
+	EXPECT_EQ(ap.sample_rate(), 0);
+	EXPECT_FALSE(ap.is_valid());
+
+	EXPECT_DOUBLE_EQ(olive::viewer_output_playhead(nullptr).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::viewer_output_length(nullptr).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::viewer_output_video_length(nullptr).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::viewer_output_audio_length(nullptr).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::sequence_timebase(nullptr).to_double(), 0.0);
+
+	EXPECT_FALSE(olive::viewer_output_is_sequence(nullptr));
+	EXPECT_FALSE(olive::viewer_output_is_footage(nullptr));
+	EXPECT_FALSE(olive::viewer_output_node_type_is(nullptr, "anything"));
+}
+
+TEST(ViewerOutputUtils, VideoParamsRoundTripThroughFacade)
+{
+	olive::ViewerOutput viewer;
+	viewer.set_video_params(olive::VideoParams(320, 240, olive::Rational(1, 25),
+											 olive::PixelFormat::u8,
+											 olive::VideoParams::k_rgba_channel_count));
+
+	const oak::VideoParams vp = olive::viewer_output_video_params(&viewer);
+	EXPECT_EQ(vp.width(), 320);
+	EXPECT_EQ(vp.height(), 240);
+	EXPECT_TRUE(vp.is_valid());
+
+	// sequence_timebase is the frame duration as a rational
+	const olive::Rational tb = olive::sequence_timebase(&viewer);
+	EXPECT_EQ(tb.numerator(), 1);
+	EXPECT_EQ(tb.denominator(), 25);
+
+	EXPECT_EQ(vp.time_base().numerator(), 1);
+	EXPECT_EQ(vp.time_base().denominator(), 25);
+}
+
+TEST(ViewerOutputUtils, PlayheadRoundTripsAndLengthDefaultsToZero)
+{
+	olive::ViewerOutput viewer;
+
+	viewer.set_playhead(olive::Rational(3, 2));
+	const olive::Rational ph = olive::viewer_output_playhead(&viewer);
+	EXPECT_EQ(ph.numerator(), 3);
+	EXPECT_EQ(ph.denominator(), 2);
+
+	// A fresh viewer has no content, so all lengths are zero
+	EXPECT_DOUBLE_EQ(olive::viewer_output_length(&viewer).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::viewer_output_video_length(&viewer).to_double(), 0.0);
+	EXPECT_DOUBLE_EQ(olive::viewer_output_audio_length(&viewer).to_double(), 0.0);
+}
+
+TEST(ViewerOutputUtils, AudioParamsRoundTripThroughFacade)
+{
+	olive::ViewerOutput viewer;
+	const uint64_t stereo_mask = 0x3; // front-left | front-right
+	viewer.set_audio_params(
+		olive::AudioParams(48000, stereo_mask, olive::SampleFormat::s16));
+
+	const olive::AudioParams ap = olive::viewer_output_audio_params(&viewer);
+	EXPECT_TRUE(ap.is_valid());
+	EXPECT_EQ(ap.sample_rate(), 48000);
+	EXPECT_EQ(ap.channel_layout(), stereo_mask);
+	EXPECT_EQ(olive::SampleFormat::Format(ap.format()), olive::SampleFormat::s16);
+}
+
+TEST(ViewerOutputUtils, TypeProbesMatchNodeIds)
+{
+	olive::Sequence sequence;
+	EXPECT_TRUE(olive::viewer_output_is_sequence(&sequence));
+	EXPECT_FALSE(olive::viewer_output_is_footage(&sequence));
+	EXPECT_TRUE(olive::viewer_output_node_type_is(
+		&sequence, "org.olivevideoeditor.Olive.sequence"));
+	EXPECT_FALSE(
+		olive::viewer_output_node_type_is(&sequence, "org.oak.test.nonexistent"));
+
+	olive::Footage footage;
+	EXPECT_TRUE(olive::viewer_output_is_footage(&footage));
+	EXPECT_FALSE(olive::viewer_output_is_sequence(&footage));
+
+	// A plain ViewerOutput is neither a Sequence nor Footage
+	olive::ViewerOutput viewer;
+	EXPECT_FALSE(olive::viewer_output_is_sequence(&viewer));
+	EXPECT_FALSE(olive::viewer_output_is_footage(&viewer));
+}
+
+TEST(ViewerTextEditorToolBar, SettersUpdateButtonsWithoutEmitting)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	QSignalSpy underline_spy(&toolbar,
+							 &olive::ViewerTextEditorToolBar::underline_changed);
+	QSignalSpy strike_spy(
+		&toolbar, &olive::ViewerTextEditorToolBar::strikethrough_changed);
+	QSignalSpy caps_spy(&toolbar,
+						&olive::ViewerTextEditorToolBar::small_caps_changed);
+
+	toolbar.set_underline(true);
+	EXPECT_TRUE(buttons.at(k_underline)->isChecked());
+	toolbar.set_strikethrough(true);
+	EXPECT_TRUE(buttons.at(k_strikethrough)->isChecked());
+	toolbar.set_small_caps(true);
+	EXPECT_TRUE(buttons.at(k_small_caps)->isChecked());
+
+	// Programmatic sync from the editor must not bounce back as user edits
+	EXPECT_EQ(underline_spy.count(), 0);
+	EXPECT_EQ(strike_spy.count(), 0);
+	EXPECT_EQ(caps_spy.count(), 0);
+}
+
+TEST(ViewerTextEditorToolBar, SetAlignmentChecksMatchingButtonOnly)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	toolbar.set_alignment(Qt::AlignHCenter);
+	EXPECT_FALSE(buttons.at(k_align_left)->isChecked());
+	EXPECT_TRUE(buttons.at(k_align_center)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_right)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_justify)->isChecked());
+
+	toolbar.set_alignment(Qt::AlignRight);
+	EXPECT_FALSE(buttons.at(k_align_left)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_center)->isChecked());
+	EXPECT_TRUE(buttons.at(k_align_right)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_justify)->isChecked());
+}
+
+TEST(ViewerTextEditorToolBar, SetVerticalAlignmentChecksMatchingButtonOnly)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	toolbar.set_vertical_alignment(Qt::AlignVCenter);
+	EXPECT_FALSE(buttons.at(k_align_top)->isChecked());
+	EXPECT_TRUE(buttons.at(k_align_middle)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_bottom)->isChecked());
+
+	toolbar.set_vertical_alignment(Qt::AlignBottom);
+	EXPECT_FALSE(buttons.at(k_align_top)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_middle)->isChecked());
+	EXPECT_TRUE(buttons.at(k_align_bottom)->isChecked());
+}
+
+TEST(ViewerTextEditorToolBar, AlignmentButtonsEmitTheirAlignment)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	// Lambda capture instead of QSignalSpy: Qt::Alignment is not guaranteed
+	// to be a registered metatype for the spy on every platform
+	QVector<Qt::Alignment> h_received;
+	QObject::connect(&toolbar,
+					 &olive::ViewerTextEditorToolBar::alignment_changed,
+					 [&h_received](Qt::Alignment a) { h_received.append(a); });
+	QVector<Qt::Alignment> v_received;
+	QObject::connect(
+		&toolbar, &olive::ViewerTextEditorToolBar::vertical_alignment_changed,
+		[&v_received](Qt::Alignment a) { v_received.append(a); });
+
+	buttons.at(k_align_center)->click();
+	ASSERT_EQ(h_received.size(), 1);
+	EXPECT_EQ(h_received.first(), Qt::AlignHCenter);
+
+	buttons.at(k_align_justify)->click();
+	ASSERT_EQ(h_received.size(), 2);
+	EXPECT_EQ(h_received.last(), Qt::AlignJustify);
+
+	buttons.at(k_align_middle)->click();
+	ASSERT_EQ(v_received.size(), 1);
+	EXPECT_EQ(v_received.first(), Qt::AlignVCenter);
+
+	buttons.at(k_align_bottom)->click();
+	ASSERT_EQ(v_received.size(), 2);
+	EXPECT_EQ(v_received.last(), Qt::AlignBottom);
+}
+
+TEST(ViewerTextEditorToolBar, ToggleButtonsEmitTheirState)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	QSignalSpy underline_spy(&toolbar,
+							 &olive::ViewerTextEditorToolBar::underline_changed);
+	QSignalSpy strike_spy(
+		&toolbar, &olive::ViewerTextEditorToolBar::strikethrough_changed);
+	QSignalSpy caps_spy(&toolbar,
+						&olive::ViewerTextEditorToolBar::small_caps_changed);
+
+	buttons.at(k_underline)->click();
+	ASSERT_EQ(underline_spy.count(), 1);
+	EXPECT_TRUE(underline_spy.first().first().toBool());
+
+	buttons.at(k_strikethrough)->click();
+	ASSERT_EQ(strike_spy.count(), 1);
+	EXPECT_TRUE(strike_spy.first().first().toBool());
+
+	buttons.at(k_small_caps)->click();
+	ASSERT_EQ(caps_spy.count(), 1);
+	EXPECT_TRUE(caps_spy.first().first().toBool());
+
+	// Unchecking emits false
+	buttons.at(k_underline)->click();
+	ASSERT_EQ(underline_spy.count(), 2);
+	EXPECT_FALSE(underline_spy.last().first().toBool());
+}
+
+TEST(ViewerTextEditorToolBar, SetColorPaintsColorButton)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	const QColor c(QStringLiteral("#FF0000"));
+	toolbar.set_color(c);
+
+	QPushButton *color_btn = buttons.at(k_color);
+	EXPECT_EQ(color_btn->property("color").value<QColor>(), c);
+	EXPECT_TRUE(color_btn->styleSheet().contains(c.name()));
+}
+
+TEST(ViewerTextEditorToolBar, SetFontFamilyUpdatesComboWithoutEmitting)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+
+	QSignalSpy family_spy(&toolbar,
+						  &olive::ViewerTextEditorToolBar::family_changed);
+
+	// Pick a family from the combo's own model: QFontDatabase also lists
+	// system fonts the QFontComboBox filters out (e.g. ".Apple Color Emoji"
+	// on macOS), which setCurrentFont can only approximate
+	auto *combo = toolbar.findChild<QFontComboBox *>();
+	ASSERT_NE(combo, nullptr);
+	ASSERT_GT(combo->count(), 1);
+	const QString family = combo->itemText(combo->count() / 2);
+	ASSERT_FALSE(family.isEmpty());
+
+	toolbar.set_font_family(family);
+
+	EXPECT_EQ(toolbar.get_font_family(), family);
+	// set_font_family blocks the combo's signals while syncing
+	EXPECT_EQ(family_spy.count(), 0);
+}
+
+TEST(ViewerTextEditorToolBar, FirstPaintEmittedOnce)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+	QSignalSpy spy(&toolbar, &olive::ViewerTextEditorToolBar::first_paint);
+
+	// Deliver paint events directly: whether the offscreen QPA paints on
+	// expose is platform-dependent, but QWidget::event always dispatches a
+	// QPaintEvent to paintEvent
+	QPaintEvent first(toolbar.rect());
+	QApplication::sendEvent(&toolbar, &first);
+	EXPECT_EQ(spy.count(), 1);
+
+	// Later repaints don't re-emit
+	QPaintEvent second(toolbar.rect());
+	QApplication::sendEvent(&toolbar, &second);
+	EXPECT_EQ(spy.count(), 1);
+}
+
+TEST(ViewerTextEditorToolBar, CloseEventIsIgnored)
+{
+	olive::ViewerTextEditorToolBar toolbar;
+
+	QCloseEvent ev;
+	QApplication::sendEvent(&toolbar, &ev);
+
+	// The toolbar is a floating child of the viewer; closing must never hide it
+	EXPECT_FALSE(ev.isAccepted());
+}
+
+TEST(ViewerTextEditorToolBar, LeftDragMovesToolbarWithinParent)
+{
+	QWidget parent;
+	parent.resize(600, 400);
+
+	olive::ViewerTextEditorToolBar toolbar(&parent);
+	toolbar.move(100, 100);
+	parent.show();
+	ASSERT_TRUE(QTest::qWaitForWindowExposed(&parent));
+
+	QTest::mousePress(&toolbar, Qt::LeftButton, Qt::NoModifier, QPoint(10, 10));
+
+	// QTest::mouseMove can't report held buttons, so deliver the move manually
+	QMouseEvent move(QEvent::MouseMove, QPointF(30, 25), QPointF(130, 125),
+					 Qt::NoButton, Qt::LeftButton, Qt::NoModifier);
+	QApplication::sendEvent(&toolbar, &move);
+
+	EXPECT_EQ(toolbar.pos(), QPoint(120, 115));
+}
+
+TEST(ViewerTextEditor, CursorWidthScalesWithInverseZoom)
+{
+	olive::ViewerTextEditor at_full(1.0);
+	EXPECT_EQ(at_full.cursorWidth(), 1);
+
+	olive::ViewerTextEditor zoomed_out(0.5);
+	EXPECT_EQ(zoomed_out.cursorWidth(), 2);
+
+	olive::ViewerTextEditor far_out(0.25);
+	EXPECT_EQ(far_out.cursorWidth(), 4);
+}
+
+TEST(ViewerTextEditor, ConstructionDefaults)
+{
+	olive::ViewerTextEditor editor(1.0);
+
+	// Rich text paste is disabled; colors default to white on transparent
+	EXPECT_FALSE(editor.acceptRichText());
+	EXPECT_EQ(editor.palette().color(QPalette::Text), QColor(Qt::white));
+
+	// Scrolling is handled by the viewer gizmo, not the text edit
+	EXPECT_EQ(editor.horizontalScrollBarPolicy(), Qt::ScrollBarAlwaysOff);
+	EXPECT_EQ(editor.verticalScrollBarPolicy(), Qt::ScrollBarAlwaysOff);
+}
+
+TEST(ViewerTextEditor, ConnectToolBarSyncsCurrentFormat)
+{
+	olive::ViewerTextEditor editor(1.0);
+
+	// Set a distinctive format before connecting; connect_tool_bar pushes the
+	// editor's current format into the toolbar exactly once
+	editor.setFontUnderline(true);
+	editor.setAlignment(Qt::AlignRight);
+
+	olive::ViewerTextEditorToolBar toolbar;
+	editor.connect_tool_bar(&toolbar);
+
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+	EXPECT_TRUE(buttons.at(k_underline)->isChecked());
+	EXPECT_TRUE(buttons.at(k_align_right)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_left)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_center)->isChecked());
+}
+
+TEST(ViewerTextEditor, ToolBarTogglesApplyToEditorFormat)
+{
+	olive::ViewerTextEditor editor(1.0);
+	olive::ViewerTextEditorToolBar toolbar;
+	editor.connect_tool_bar(&toolbar);
+
+	const auto buttons = toolbar_buttons(&toolbar);
+	ASSERT_EQ(buttons.size(), 11);
+
+	buttons.at(k_underline)->click();
+	EXPECT_TRUE(editor.currentCharFormat().fontUnderline());
+
+	buttons.at(k_strikethrough)->click();
+	EXPECT_TRUE(editor.currentCharFormat().fontStrikeOut());
+
+	buttons.at(k_small_caps)->click();
+	EXPECT_EQ(editor.currentCharFormat().fontCapitalization(),
+			  QFont::SmallCaps);
+
+	buttons.at(k_align_center)->click();
+	EXPECT_EQ(editor.alignment(), Qt::AlignHCenter);
+
+	// The toolbar follows the editor back (same alignment echo)
+	EXPECT_TRUE(buttons.at(k_align_center)->isChecked());
+	EXPECT_FALSE(buttons.at(k_align_left)->isChecked());
+}
+
+TEST(ViewerTextEditor, PaintNeverRendersTextByDesign)
+{
+	olive::ViewerTextEditor editor(1.0);
+	editor.resize(200, 80);
+	editor.setPlainText(QStringLiteral("Hello"));
+
+	// document_changed() swaps in a clone whose text is fully transparent (the
+	// HACK in viewertexteditor.cpp: the gizmo underneath renders the text, the
+	// editor must not render it a second time). Verify that contract: nothing
+	// is painted, with or without a selection, at any vertical alignment.
+	QTextCursor c = editor.textCursor();
+	c.select(QTextCursor::Document);
+	editor.setTextCursor(c);
+
+	for (const Qt::Alignment valign :
+		 { Qt::AlignTop, Qt::AlignVCenter, Qt::AlignBottom }) {
+		QImage img(200, 80, QImage::Format_ARGB32);
+		img.fill(Qt::transparent);
+		{
+			QPainter p(&img);
+			editor.paint(&p, valign);
+			EXPECT_TRUE(p.isActive());
+		}
+		for (int y = 0; y < img.height(); y++) {
+			for (int x = 0; x < img.width(); x++) {
+				EXPECT_EQ(qAlpha(img.pixel(x, y)), 0)
+					<< "painted pixel at " << x << "," << y;
+			}
+		}
+	}
+}