How to call a function when a delayed tween starts tweening?

Phaser 3
1

Tween can have onStart callback, but this callback is fired immediately after the tween is started and it ignores tween’s delay. Is there a way how to call a callback when the delayed tweening is really started?

Now, I’m using this.time.delayedCall() with the same delay as the tween has, but this seems to me as not the best solution.

2

There doesn’t seem to be an onStart that is called after a delay. However, you could always extend the Phaser.Scene class and add your own tween method. In the tween method you could do something like the following:

/**
 * @param {Phaser.Math.Easing} ease 
 * @param {Phaser.GameObjects.GameObject} object 
 * @return {Phaser.Tweens.Tween}
 */
addTween(object, duration, parameters, ease = null)
{
    parameters.targets = object;
    parameters.ease = ease;
    parameters.duration = duration;

    if(parameters.onStart && parameters.delay)
    {
        let startFunc = parameters.onStart;
        delete parameters.onStart;
        this.time.delayedCall(parameters.delay, startFunc);
    }

    return this.tweens.add(parameters);
}