synchronize playing status to play/pause button

src/drone_controller.cc

@@ -62,36 +62,47 @@ int DroneController::getDuration() const {
 
 
 void DroneController::step() {
-	qDebug() << "frame " << frame << "/" << duration
+	qDebug("frame %d (%d%%)", frame, (int) ((double) frame / duration * 100));
-			 << " (" << (double) frame / duration * 100 << "%)";
 	emit frameChanged(frame);
+	if (frame == duration) {
+		pause();
+	} else {
 		frame++;
 	}
+}
 
 
 void DroneController::play() {
+	if (!paused) return;
 	paused = false;
 	timer.start(1000. / framerate);
 	qDebug() << "playing";
+	emit playing();
 }
 
 
 void DroneController::pause() {
+	if (paused) return;
 	paused = true;
 	timer.stop();
 	qDebug() << "pausing";
+	emit pausing();
 }
 
 
 void DroneController::suspend() {
-	bool old_paused = paused;
+	if (!paused) {
 		pause();
-	paused = old_paused;
+		paused = false;
+	}
 }
 
 
 void DroneController::resume() {
-	if (!paused) play();
+	if (!paused) {
+		paused = true;
+		play();
+	}
 }
 
 

src/drone_controller.hh

@@ -41,6 +41,8 @@ public:
 
 signals:
 	void frameChanged(int frame);
+	void playing();
+	void pausing();
 
 private slots:
 	void step();

src/main_window.cc

@@ -55,6 +55,8 @@ void MainWindow::open(const QString &path) {
 	if (dc) delete dc;
 	dc = new DroneController(json_doc.object());
 	playpause_action->setEnabled(true);
+	connect(dc, &DroneController::playing, this, &MainWindow::play);
+	connect(dc, &DroneController::pausing, this, &MainWindow::pause);
 	slider->setMinimum(0);
 	slider->setMaximum(dc->getDuration());
 	connect(slider, &QSlider::sliderPressed, dc, &DroneController::suspend);