began work on scrollable headers on viewer panels

mainwindow.cpp

@@ -311,7 +311,11 @@ void MainWindow::on_actionZoom_In_triggered()
         panel_timeline->set_zoom(true);
 	} else if (panel_effect_controls->keyframe_focus()) {
 		panel_effect_controls->set_zoom(true);
-	}
+    } else if (panel_footage_viewer->is_focused()) {
+        panel_footage_viewer->set_zoom(true);
+    } else if (panel_sequence_viewer->is_focused()) {
+        panel_sequence_viewer->set_zoom(true);
+    }
 }
 
 void MainWindow::on_actionZoom_out_triggered()
@@ -320,7 +324,11 @@ void MainWindow::on_actionZoom_out_triggered()
         panel_timeline->set_zoom(false);
 	} else if (panel_effect_controls->keyframe_focus()) {
 		panel_effect_controls->set_zoom(false);
-	}
+    } else if (panel_footage_viewer->is_focused()) {
+        panel_footage_viewer->set_zoom(false);
+    } else if (panel_sequence_viewer->is_focused()) {
+        panel_sequence_viewer->set_zoom(false);
+    }
 }
 
 void MainWindow::on_actionExport_triggered()
@@ -582,7 +590,7 @@ void MainWindow::on_actionEdit_Tool_triggered()
 
 void MainWindow::on_actionToggle_Snapping_triggered()
 {
-    if (panel_timeline->focused()) panel_timeline->ui->snappingButton->click();
+    if (panel_timeline->focused() || panel_effect_controls->keyframe_focus()) panel_timeline->ui->snappingButton->click();
 }
 
 void MainWindow::on_actionPointer_Tool_triggered()

panels/viewer.cpp

@@ -37,7 +37,8 @@ Viewer::Viewer(QWidget *parent) :
     ui(new Ui::Viewer),
     created_sequence(false),
     cue_recording_internal(false),
-    panel_name("Viewer: ")
+    panel_name("Viewer: "),
+    minimum_zoom(1.0)
 {
 	ui->setupUi(this);
 	ui->headers->viewer = this;
@@ -59,6 +60,7 @@ Viewer::Viewer(QWidget *parent) :
 
 	connect(&playback_updater, SIGNAL(timeout()), this, SLOT(timer_update()));
 	connect(&recording_flasher, SIGNAL(timeout()), this, SLOT(recording_flasher_update()));
+    connect(ui->horizontalScrollBar, SIGNAL(valueChanged(int)), ui->headers, SLOT(set_scroll(int)));
 
     update_playhead_timecode(0);
     update_end_timecode();
@@ -380,7 +382,12 @@ void Viewer::update_end_timecode() {
 void Viewer::update_header_zoom() {
 	if (seq != NULL) {
 		long sequenceEndFrame = seq->getEndFrame();
-		ui->headers->update_zoom((sequenceEndFrame > 0) ? ((double) ui->headers->width() / (double) sequenceEndFrame) : 1);
+        if (cached_end_frame != sequenceEndFrame) {
+            minimum_zoom = (sequenceEndFrame > 0) ? ((double) ui->headers->width() / (double) sequenceEndFrame) : 1;
+            ui->headers->update_zoom(qMax(ui->headers->get_zoom(), minimum_zoom));
+        } else {
+            ui->headers->update();
+        }
 	}
 }
 
@@ -411,7 +418,15 @@ void Viewer::set_in_point() {
 }
 
 void Viewer::set_out_point() {
-	ui->headers->set_out_point(seq->playhead);
+    ui->headers->set_out_point(seq->playhead);
+}
+
+void Viewer::set_zoom(bool in) {
+    if (in) {
+        ui->headers->update_zoom(ui->headers->get_zoom()*2);
+    } else {
+        ui->headers->update_zoom(qMax(minimum_zoom, ui->headers->get_zoom()*0.5));
+    }
 }
 
 void Viewer::set_media(int type, void* media) {

panels/viewer.h

@@ -36,6 +36,7 @@ public:
     void clear_inout_point();
 	void set_in_point();
 	void set_out_point();
+    void set_zoom(bool in);
 
 	// playback functions
 	void go_to_start();
@@ -86,7 +87,9 @@ private:
     void set_sequence(bool main, Sequence* s);
 	bool main_sequence;
 	bool created_sequence;
+    long cached_end_frame;
     QString panel_name;
+    double minimum_zoom;
 
 	bool cue_recording_internal;
 	QTimer recording_flasher;

panels/viewer.ui

@@ -64,6 +64,13 @@
       <item>
        <widget class="TimelineHeader" name="headers" native="true"/>
       </item>
+      <item>
+       <widget class="QScrollBar" name="horizontalScrollBar">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QWidget" name="playbackControls" native="true">
         <property name="sizePolicy">

ui/timelineheader.cpp

@@ -255,7 +255,11 @@ void TimelineHeader::update_parents() {
 
 void TimelineHeader::update_zoom(double z) {
 	zoom = z;
-	update();
+    update();
+}
+
+double TimelineHeader::get_zoom() {
+    return zoom;
 }
 
 void TimelineHeader::delete_markers() {

ui/timelineheader.h

@@ -20,6 +20,7 @@ public:
 
 	void show_text(bool enable);
 	void update_zoom(double z);
+    double get_zoom();
 	void delete_markers();
 
 public slots: