Is there a way I can get the screen height in pixe...

# compose

[Arun Joseph]

Is there a way I can get the screen height in pixels, LocalConfiguration.current.screenHeightDp.dp.toPx() is doing some rounding and I get errors when comparing with Offset from LayoutCoordinates.

[Alex Vanyo]

Can I ask what you’re trying to use the “screen height” for?
And which offset you’re using from LayoutCoordinates?
There’s some tricky subtlety there that you might be running into

[Arun Joseph]

I have a custom bottom sheet scaffold and the draggable bottomsheet part calculates its bottomSheetOffset using onPlaced and pass to the scaffold

bottomSheet = {
    Surface(
        swipeable
            .fillMaxWidth()
            .onPlaced {
                bottomSheetOffset =
                    it.positionInParent()
            },
        shape = sheetShape,
        elevation = sheetElevation,
        color = sheetBackgroundColor,
        contentColor = sheetContentColor,
        content = {
            scaffoldState.bottomSheetState.sheetContent()
        }
    )
},

and in scaffold, I calculate padding in pixels for main content as LocalConfiguration.current.screenHeightDp.dp.toPx() - bottomSheetOffset.y
On Pixel 6. when bottom sheet is fully collapsed, I get bottomSheetOffset.y as 2274.0 and LocalConfiguration.current.screenHeightDp.dp.toPx() as 2273.25

[Alex Vanyo]

If you’re using positionInParent, can you use the parent size directly?
That’s going to be the more directly meaningful number than the size reported by the configuration.

[Alex Vanyo]

Depending on the “screen height” means that your bottom sheet scaffold can only be used correctly when the bottom sheet scaffold’s exactly matches the “screen height”. What’s more relevant in this case is how big your bottom sheet scaffold actually is, and that would also allow your scaffold to only occupy part of the screen and still work correctly.

I’ve been putting “screen height” in quotations because there’s a few different interpretations. If you’re in multi-window mode or have a freeform window, the physical display size is irrelevant: what matters is the window size. And LocalConfiguration.current.screenHeightDp can also be different from the actual window size because of insets.

[Arun Joseph]

Thanks a lot, parent window size is more accurate in my case, and that is reported as 2274.0 correctly.

[Alex Vanyo]

Was that with it.parentCoordinates.size?

[Arun Joseph]

It was with

it.parentLayoutCoordinates?.size?.height?.toFloat()!!

[Arun Joseph]

parentCoordinates is reporting

it.parentLayoutCoordinates?.size - it.positionInParent().size

[Alex Vanyo]

Great to hear! Just wanted to make sure the solution was captured for others too 😄