<@UHAJKUSTU> Is there an option to reverse an anim...

# decompose

[Paul Woitaschek]

@Arkadii Ivanov
Is there an option to reverse an animation direction conditionally?

slide(
          orientation = when (child.instance) {
            is FlowBaseViewModel.Offer, is FlowBaseViewModel.ProPage -> Orientation.Vertical
            else -> Orientation.Horizontal
          },
        )

On vertical mode I’d like it to go up on enter and down on leaving for the vertical variant

[Arkadii Ivanov]

I think you would have to write something like this:

when (child.instance) {
    is FlowBaseViewModel.Offer, is FlowBaseViewModel.ProPage -> slide(orientation = Orientation.Vertical)
    else -> slide(orientation = Orientation.Horizontal)
}

[Paul Woitaschek]

Isn’t that literally the same?

[Arkadii Ivanov]

Oh right.

[Arkadii Ivanov]

Can you post more code? Including Children function.

[Arkadii Ivanov]

Oh, I got it. You want to invert the direction in the vertical case. Here you go.

fun StackAnimator.invert(): StackAnimator =
    StackAnimator { direction, isInitial, onFinished, content -> 
        this(
            direction = direction.invert(),
            isInitial = isInitial,
            onFinished = onFinished,
            content = content,
        )
    }

private fun Direction.invert(): Direction =
    when (this) {
        Direction.ENTER_FRONT -> Direction.ENTER_BACK
        Direction.EXIT_FRONT -> Direction.EXIT_BACK
        Direction.ENTER_BACK -> Direction.ENTER_FRONT
        Direction.EXIT_BACK -> Direction.EXIT_FRONT
    }

[Arkadii Ivanov]

So just slide(orientation = Orientation.Vertical).invert().

[Paul Woitaschek]

I think the problem here is that `slide`ignores the direction internally

[Arkadii Ivanov]

You can try - it should work. slide will be receiving different factor. See the docs here.