trigger method
Implementation
@override
void trigger(CallbackData data) {
if (data.context is StateMachineController) {
var controller = data.context as StateMachineController;
_secondsDelay = data.delay;
controller.reportEvent(this);
} else if (data.context is LinearAnimationInstance) {
var animation = data.context as LinearAnimationInstance;
animation.reportEvent(this);
}
}