How can I make a swipe transition?

[davidmarinangeli]

Hello!

I really like your library and I'm trying to develop a transition like the weather app on your Readme: how could I make an up/down swipe?

I've tried with this but the result is VERY BAD. Do you know where I can find some examples? Thanks.
var screenSize = size.y screen.setOnTouchListener { v, event -> when (event.action) { MotionEvent.ACTION_DOWN -> { oldY = event.y true } MotionEvent.ACTION_MOVE -> { transition.setProgress((event.y - oldY)/screenSize) true } else -> { true } } }

[radoyankov]

Which part exactly looks bad? If you are trying to set the touch listener on the element you are resizing ("screen") you will get a weird twitch on the view. If this is your problem, try setting the touch listener on another view, one which is static (I usually set it on the root one).

[davidmarinangeli]

screen is the static/root one (the constraintlayout). The result is the disaster you can see down below. : \

https://photos.app.goo.gl/VTdkIDg4JR1itcqe2

[davidmarinangeli]

XML:
https://gist.github.com/davidmarinangeli/075b489ac91703c88a149a3d0e8d4787
Kotlin:
https://gist.github.com/davidmarinangeli/aa8657525fe2f43d215045932bb6226c

[radoyankov]

Before you create your Transitioner object you have to wait for the screen and the views to be drawn. I recommend placing it in a layout listener or, like the example shows, to add a small delay before creating the object.

[davidmarinangeli]

Ok I create a layout listener and it works, but the animation in REALLY fast, I hope to adjust it by my own. Thanks a lot!