Is it possible to access the size of a drawing environment? In my specific use case I'm applying the

graphicsLayer

modifier to an

Image

. I need the size of the image respective to content scale in order to implement some customized gestures. I've tried

onSizeChanged

and

onGloballyPositioned

but those seem to be used for the layouts rather than graphics so it isn't called when transformations are made through

graphicsLayer

you could try

BoxWithConstraints

Graphics layer transformations are included in the position and size calculations of a layout node, including all the calculations for pointer input, so if you have the modifier order set up correctly then what you're trying to do should work. Can you share your code?

Was using gestures to scale and rotate this image but so far it looks like

onSizeChanged

and

onGloballyPositioned

are only called initially. When scaling, rotating or offsetting the image it's not calling them.

Image(
            modifier = Modifier
                .fillMaxSize()
                .onSizeChanged {
                    Log.v("onSizeChanged", it.toString())
                }
                .onGloballyPositioned {
                    Log.v("onGloballyPositioned", "Parent: " + it.boundsInParent())
                    Log.v("onGloballyPositioned", "Window: " + it.boundsInWindow())
                    Log.v("onGloballyPositioned", "Root: " + it.boundsInRoot())
                }
                .graphicsLayer {
                    scaleX = scale
                    scaleY = scale
                    rotationZ = rotation
                    translationX = offsetX
                    translationY = offsetY
                },
            painter = rememberImagePainter(photoUrl),
            contentDescription = stringResource(id = R.string.close_image)
        )

Oh, so the values returned by LocalCoordinates should take the layer into account but the callback doesn't happen. I wonder if

onPlaced

will get invoked for those changes?

I tried that too but didn't seem to get called. It does get called when I use scale and offset modifiers instead but those affect the layout and don't give me the size of the painted image. 😢

FWIW, https://issuetracker.google.com/226224844

Much appreciated! This will help with future photo galleries built with compose!