Observer issue with macbook trackpad

[adamchampagne]

we are having a trouble to solve problem with macbook trackpad, it is so sensitive that will trigger 2 animations at one flick. We just want one flick, one animation.

See the Pen XWzRraJ?editors=0010 by GreenSock (@GreenSock) on CodePen

[GreenSock]

That's not an Observer issue - it's just that Apple touchpads and magic mouse keep emitting "wheel" events for a while after you release - it's what creates the momentum effect. So if you flick very strongly, you're firing the animation and then when the animation is done, there are still wheel events getting fired from the strong flick (momentum), thus it triggers another animation because those residual wheel events triggered the Observer's onUp()/onDown(). 

 

See the problem? 

 

So you could add some logic to sense that condition and work around it, like maybe: 

See the Pen jORLMLO?editors=0010 by GreenSock (@GreenSock) on CodePen

 

To make things easy, I just use ScrollTrigger's "scrollEnd" event handler but you could wire that all up yourself manually if you prefer not to use ScrollTrigger. 

 

Does that work better for you?