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
-			 << " (" << (double) frame / duration * 100 << "%)";
+	qDebug("frame %d (%d%%)", frame, (int) ((double) frame / duration * 100));
 	emit frameChanged(frame);
-	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;
-	pause();
-	paused = old_paused;
+	if (!paused) {
+		pause();
+		paused = false;
+	}
 }
 
 
 void DroneController::resume() {
-	if (!paused) play();
+	if (!paused) {
+		paused = true;
+		play();
+	}
 }