Add Playhead and Timeline to Pattern Editor (#7794)

Adds a visual indicator to show the pattern editor playing, along with a timeline widget to allow the user to skip forward/backward in a pattern.

include/MidiClipView.h

@@ -97,6 +97,7 @@ private:
 	QPixmap m_stepBtnOn200 = embed::getIconPixmap("step_btn_on_200");
 	QPixmap m_stepBtnOff = embed::getIconPixmap("step_btn_off");
 	QPixmap m_stepBtnOffLight = embed::getIconPixmap("step_btn_off_light");
+	QPixmap m_stepBtnHighlight = embed::getIconPixmap("step_btn_highlight");
 
 	MidiClip* m_clip;
 	QPixmap m_paintPixmap;

include/PatternEditor.h

@@ -37,6 +37,7 @@ namespace gui
 {
 
 class ComboBox;
+class TimeLineWidget;
 
 
 class PatternEditor : public TrackContainerView
@@ -62,13 +63,19 @@ public slots:
 	void addSampleTrack();
 	void addAutomationTrack();
 	void cloneClip();
+	void updateMaxSteps();
 
 protected slots:
 	void dropEvent(QDropEvent * de ) override;
+	void resizeEvent(QResizeEvent* de) override;
 	void updatePosition();
+	void updatePixelsPerBar();
 
 private:
 	PatternStore* m_ps;
+	TimeLineWidget* m_timeLine;
+	int m_trackHeadWidth;
+	tick_t m_maxClipLength;
 	void makeSteps( bool clone );
 };
 

include/PatternStore.h

@@ -100,6 +100,8 @@ public slots:
 	void updateComboBox();
 	void currentPatternChanged();
 
+signals:
+	void trackUpdated();
 
 private:
 	ComboBoxModel m_patternComboBoxModel;