LeanTween callbacks

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In this post we will review several LeanTween callbacks and some useful features. First things first letís talk about callbacks. Also, check the previous article about the basics of LeanTween.

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Basic callbacks

LeanTween has basic callbacks as setOnStart, setOnUpdate, setOnComplete. Every method takes as a parameter basic C# void delegate – Action. It can come with object parameter or float parameter and object parameter.

OnComplete has addition – setOnCompleteOnRepeat, setOnCompleteOnStart.

setOnCompleteOnRepeat – calls method set OnComplete every loop iteration

setOnCompleteOnStart – calls method set OnComplete at the start of animation.

Full logic of the methods calls showed on diagram:

callbacks diagram

For example:

We need delay-based loop for loading animation like this:

callbacks load 2

We have 4 images (or sprites) that we need to move

public GameObject WhiteDot;
public GameObject BlackDot;
public GameObject RedDot;
public GameObject GreeDot;

And animate them by moving every dot to the next, just like this.

private void AnimationLoop()
    if(!_isAnimate) return;
    LeanTween.move(WhiteDot, BlackDot.transform.position, MoveTime).setEaseInOutCubic();
    LeanTween.move(BlackDot, RedDot.transform.position, MoveTime).setEaseInOutCubic();
    LeanTween.move(RedDot, GreeDot.transform.position, MoveTime).setEaseInOutCubic();
    LeanTween.move(GreeDot, WhiteDot.transform.position, MoveTime)

Here we set OnComplete AnimationLoop method itself. It looks like recursion but it is not.

Another example illustrate the logic of setOnCompleteOnRepeat and setOnCompleteOnStart.

This is simple ping-pong animation created with setLoopPingPong for dot movement. We set OnComplete method for change color of dot at the end.

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LeanTween.move(WhiteDot, targetPosition, MoveTime).setOnComplete(ChangeColor).setLoopPingPong();

As we know setting loop without parameter makes infinite loop and it never calls OnComplete. To get every loop iteration end, we just write:

setOnCompleteOnRepeat(true)LeanTween.move(WhiteDot, targetPosition, MoveTime).setOnComplete(ChangeColor).setOnCompleteOnRepeat(true).setLoopPingPong();

Here is result:

callbacks onRepeat

But at the start dot was white and become green only after first iteration. To deal with it we need setOnCompleteOnStart.

LeanTween.move(WhiteDot, targetPosition, MoveTime).setOnComplete(ChangeColor).setOnCompleteOnStart(true).setOnCompleteOnRepeat(true).setLoopPingPong();

callbacks onStart

We can also destroy object after animation end. Just add setDestroyOnComplete(true).

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