Hey. Why is it that there’s no easy way to combine...

# compose

[gsala]

Hey. Why is it that there’s no easy way to combine or modify PaddingValues . Sometimes I would like to combine padding values like WindowInsets.ime.asPaddingValues - PaddingValues(bottom = 30.dp) . Other times I would just like to override some default padding values like BottomSheetDefaults.ContentPadding.copy(bottom = 0.dp). Shouldn’t this be easier in the compose APIs ? Or am I missing the right way to do this?

[Zach Klippenstein (he/him) [MOD]]

Please file a feature request

[Quinten Schelfhout]

I create an extension for + and - on PaddingValues
I also found it weird that this is not included.

[gsala]

Filed at https://issuetracker.google.com/issues/244468479

[Adam Powell]

The hardcoded LTR is going to give you a bad time

[Adam Powell]

You're going to have to return a PaddingValues that holds onto both inputs so it can delegate with the right layout direction when asked

[Zoltan Demant]

Was just going to say that, probably huge headache when RTL support lands in the future and the padding is off for some reason.
LocalLayoutDirection.current

[Adam Powell]

Nope, not LocalLayoutDirection either

[Adam Powell]

Calculate on the fly

[Zoltan Demant]

Oh, I think I understand what you mean.

[Adam Powell]

Bidi padding when mixed relative and absolute paddings are involved is a nightmare

[Adam Powell]

Anything you try to cache or precompute will be a bug later

[gsala]

So there’s no straightforward solution for this? I’d have to make a new implementation of PaddingValues
The issue I filed has people mentioning that it shouldn’t be a problem to support this. I was hoping to just have it now instead of waiting for it to be implemented in foundation and released

[Zoltan Demant]

Couldnt you do something like this?

class CombinedPaddingValues(
    val first: PaddingValues,
    val second: PaddingValues,
) : PaddingValues {

    override fun calculateLeftPadding(layoutDirection: LayoutDirection): Dp {
        return first.calculateLeftPadding(layoutDirection) + second.calculateLeftPadding(layoutDirection)
    }
}

[gsala]

What if I want to implement a minus then? Another implementation?

[Zoltan Demant]

Its far from ideal, especially if you need to do it yourself as compared to it already being in one of the compose libraries. Ive starred the issue!