basic undo support added

mainwindow.cpp

@@ -161,3 +161,17 @@ void MainWindow::on_actionRipple_Delete_triggered()
 {
 	panel_timeline->delete_selection(true);
 }
+
+void MainWindow::on_action_Undo_triggered()
+{
+    if (panel_timeline->focused()) {
+        panel_timeline->undo();
+    }
+}
+
+void MainWindow::on_action_Redo_triggered()
+{
+    if (panel_timeline->focused()) {
+        panel_timeline->redo();
+    }
+}

mainwindow.h

@@ -51,6 +51,10 @@ private slots:
 
 	void on_actionRipple_Delete_triggered();
 
+    void on_action_Undo_triggered();
+
+    void on_action_Redo_triggered();
+
 private:
 	Ui::MainWindow *ui;
 	void setup_layout();

olive.pro.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.6.1, 2018-06-07T15:46:16. -->
+<!-- Written by QtCreator 4.6.1, 2018-06-07T16:17:16. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -292,7 +292,7 @@
     <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.ProFile">olive.pro</value>
     <value type="bool" key="Qt4ProjectManager.Qt4RunConfiguration.UseDyldImageSuffix">false</value>
     <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory"></value>
-    <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory.default">C:/Users/Matt/Documents/temp</value>
+    <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory.default"></value>
     <value type="uint" key="RunConfiguration.QmlDebugServerPort">3768</value>
     <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>

panels/timeline.cpp

@@ -137,6 +137,22 @@ bool Timeline::focused() {
 	return (ui->video_area->hasFocus() || ui->audio_area->hasFocus());
 }
 
+void Timeline::undo() {
+    if (sequence != NULL) {
+        sequence->undo();
+        ui->video_area->redraw_clips();
+        ui->audio_area->redraw_clips();
+    }
+}
+
+void Timeline::redo() {
+    if (sequence != NULL) {
+        sequence->redo();
+        ui->video_area->redraw_clips();
+        ui->audio_area->redraw_clips();
+    }
+}
+
 void Timeline::repaint_timeline() {
 	if (playing) {
 //		playhead = playhead_start + (playback_timer.elapsed() * 0.001 * sequence->frame_rate);
@@ -151,6 +167,9 @@ void Timeline::repaint_timeline() {
 }
 
 void Timeline::redraw_all_clips() {
+    // add current sequence to the undo stack
+    sequence->undo_add_current();
+
 	ui->video_area->redraw_clips();
 	ui->audio_area->redraw_clips();
 }

panels/timeline.h

@@ -61,6 +61,8 @@ public:
 	bool focused();
 	void zoom_in();
 	void zoom_out();
+    void undo();
+    void redo();
 	void set_sequence(Sequence* s);
 
 	Sequence* sequence;

project/sequence.cpp

@@ -5,6 +5,7 @@
 #include <QDebug>
 
 Sequence::Sequence() {
+    undo_pointer = -1;
 }
 
 Sequence::~Sequence() {
@@ -120,3 +121,29 @@ void Sequence::split_at_playhead(long frame) {
 		}
 	}
 }
+
+void Sequence::undo_add_current() {
+    undo_pointer++;
+    undo_stack.resize(undo_pointer);
+    undo_stack.append(clips);
+    qDebug() << "a pointer:" << undo_pointer << undo_stack.size();
+}
+
+void Sequence::undo() {
+    if (undo_pointer > 0) {
+        undo_pointer--;
+        clips = undo_stack[undo_pointer];
+    } else {
+        qDebug() << "[INFO] No more undos";
+    }
+    qDebug() << "u pointer:" << undo_pointer << undo_stack.size();
+}
+void Sequence::redo() {
+    if (undo_pointer == undo_stack.size() - 1) {
+        qDebug() << "[INFO] No more redos";
+    } else {
+        undo_pointer++;
+        clips = undo_stack[undo_pointer];
+    }
+    qDebug() << "r pointer:" << undo_pointer << undo_stack.size();
+}

project/sequence.h

@@ -1,6 +1,8 @@
 #ifndef SEQUENCE_H
 #define SEQUENCE_H
 
+#define UNDO_LIMIT 100
+
 #include <QVector>
 
 #include "project/clip.h"
@@ -25,8 +27,16 @@ public:
 	float frame_rate;
 	int audio_frequency;
 	int audio_layout;
+
+    void undo_add_current();
+    void undo();
+    void redo();
 private:
 	QList<Clip> clips;
+
+    QVector<QList<Clip>> undo_stack;
+    int undo_pointer;
+    int undo_stack_start;
 };
 
 #endif // SEQUENCE_H

ui/timelinewidget.cpp

@@ -772,8 +772,8 @@ void TimelineWidget::paintEvent(QPaintEvent*) {
 		if (panel_timeline->tool == TIMELINE_TOOL_EDIT || panel_timeline->tool == TIMELINE_TOOL_RAZOR) {
 			QPoint mouse_pos = mapFromGlobal(QCursor::pos());
 			int track = getTrackFromScreenPoint(mouse_pos.y());
-			if (is_track_visible(track)) {
-				int cursor_x = getScreenPointFromFrame(getFrameFromScreenPoint(mouse_pos.x(), false));
+            if (is_track_visible(track)) {
+                int cursor_x = getScreenPointFromFrame(getFrameFromScreenPoint(mouse_pos.x(), false));
 				int cursor_y = getScreenPointFromTrack(track);
 
 				p.setPen(Qt::gray);