Allow the API user know the "visibility" progress of the bottom sheet.

[sergionettl]

Is your feature request related to a problem?
I want to use the progress of the visibility to dynamically update some contents

Describe the solution you'd like:

FlexibleSheetState would contain a state property progress : State<Float>.
0f would mean the bottom sheet is Hidden
1f would mean the bottom sheet is FullyExpanded

This progress would update whenever an automatic animation occurs or when the user drags the bottom sheet up or down.

Describe alternatives you've considered:

Manually calculation the bottom sheet visible height. And doing approximated calculations.

[seanutf1]

In the FlexibleBottomSheet, there is an onTargetChanges callback. This parameter does not meet your requirements, does it?

[sergionettl]

onTargetChanges passes FlexibleSheetValue which is an enum with the discrete defined values. What I mentioned is the full range. This is the code I'm using for now to accomplish this.

// Full screen height
val screenHeightPx = with(LocalDensity.current) { LocalConfiguration.current.screenHeightDp.dp.toPx() }
val fullyExpanded: Float = 1f
  
  /**
 * Offset related to the bottom sheet offset
 * Offset: 0 when Fully expanded
 * Offset: ScreenHeight when Fully Hidden
 */
val offsetPx by rememberUpdatedState(
  try {
    sheetState.requireOffset()
  } catch (ex: IllegalStateException) {
    screenHeightPx
  },
)
    
val progress = when (screenHeightPx) {
  0f -> 0f
  else -> (screenHeightPx - offsetPx) / screenHeightPx
}.coerceIn(0f, 1f)

This assumes FullExpanded equals to screen height