gizmos: consolidated input param dragging code into reusable class

2020-05-07 14:41:50 +10:00
parent d02e9090b9
commit 3436740d23
11 changed files with 237 additions and 87 deletions
@@ -0,0 +1,118 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "inputdragger.h"
+
+#include "core.h"
+#include "node.h"
+#include "widget/nodeparamview/nodeparamviewundo.h"
+
+OLIVE_NAMESPACE_ENTER
+
+NodeInputDragger::NodeInputDragger() :
+  input_(nullptr)
+{
+
+}
+
+bool NodeInputDragger::IsStarted() const
+{
+  return input_;
+}
+
+void NodeInputDragger::Start(NodeInput *input, const rational &time, int track)
+{
+  Q_ASSERT(!input_);
+
+  // Set up new drag
+  input_ = input;
+  time_ = time;
+  track_ = track;
+
+  // Cache current value
+  start_value_ = input_->get_value_at_time_for_track(time, track);
+
+  // Determine whether we are creating a keyframe or not
+  if (input_->is_keyframing()) {
+    dragging_key_ = input_->get_keyframe_at_time_on_track(time, track);
+    drag_created_key_ = !dragging_key_;
+
+    if (drag_created_key_) {
+      dragging_key_ = NodeKeyframe::Create(time,
+                                           start_value_,
+                                           input_->get_best_keyframe_type_for_time(time, track),
+                                           track);
+
+      // We disable default signal emitting during the drag
+      input_->blockSignals(true);
+      input_->insert_keyframe(dragging_key_);
+      input_->blockSignals(false);
+
+      emit input_->KeyframeAdded(dragging_key_);
+    }
+  }
+}
+
+void NodeInputDragger::Drag(const QVariant& value)
+{
+  Q_ASSERT(input_);
+
+  end_value_ = value;
+
+  input_->blockSignals(true);
+
+  if (input_->is_keyframing()) {
+    dragging_key_->set_value(value);
+  } else {
+    input_->set_standard_value(value, track_);
+  }
+
+  input_->blockSignals(false);
+}
+
+void NodeInputDragger::End()
+{
+  if (!IsStarted()) {
+    return;
+  }
+
+  QUndoCommand* command = new QUndoCommand();
+
+  if (input_->is_keyframing()) {
+    if (drag_created_key_) {
+      // We created a keyframe in this process
+      new NodeParamInsertKeyframeCommand(input_, dragging_key_, true, command);
+    }
+
+    // We just set a keyframe's value
+    // We do this even when inserting a keyframe because we don't actually perform an insert in this undo command
+    // so this will ensure the ValueChanged() signal is sent correctly
+    new NodeParamSetKeyframeValueCommand(dragging_key_, end_value_, start_value_, command);
+  } else {
+    // We just set the standard value
+    new NodeParamSetStandardValueCommand(input_, track_, end_value_, start_value_, command);
+  }
+
+  Core::instance()->undo_stack()->push(command);
+
+  input_ = nullptr;
+}
+
+OLIVE_NAMESPACE_EXIT