buttonStop.on('clicked', () => {
this.actor.removeTransition('rotateTransition');
this.actor.setRotationAngle(Clutter.RotateAxis.Z_AXIS, 0);
scale.setSensitive(true);
buttonStart.setSensitive(true);
buttonStop.setSensitive(false);
});
buttonStart.on('clicked', () => {
let tg, pt;
pt = new Clutter.PropertyTransition({ propertyName: 'rotation-angle-z' });
pt.setFrom(0);
pt.setTo(360);
pt.setDuration(2000);
pt.setProgressMode(Clutter.AnimationMode.LINEAR);
tg = new Clutter.TransitionGroup();
tg.setDuration(2000);
tg.setRepeatCount(-1); // Infinite
tg.addTransition(pt);
// Add more property transitions ...
this.actor.addTransition('rotateTransition', tg);
scale.setSensitive(false);
buttonStart.setSensitive(false);
buttonStop.setSensitive(true);
});