Provide a method to make the bottom sheet non-cancellable for some use-cases.

Describe the bug

Provide a method to make the bottom sheet non-cancellable for some use-cases.

Expected behaviour

When a user clicks the back button or the outside content of the bottom sheet, then it dismisses. However, there should be a way to control that behaviour based on a flag that the bottom sheet should not dismiss. It should only dismiss via calling navGraph.navigateBack().

Environment:

• Android OS version: [Android 11.0]
• Device: [Samsung M20]
• Accompanist version: [0.17.0]

[jossiwolf]

@dilraj-singh1997 Thanks for the feature request. The bottom sheet will always be dismissed when the associated destination is popped of the back stack (such as is the case when going back). I will look into exposing a flag that mirrors ModalBottomSheetLayout's gesturesEnabled flag to disable dismissal by touching outside of the sheet.

@ravitejasc Please don’t do this - BottomSheetNavigator relies on implementation details of ModalBottomSheetState to work. Overriding confirmStateChange does not guarantee this to work and is a good way to get the navigator out of sync. This constructor of BottomSheetNavigator might be made internal in the future.

[hiteshchopra11]

@dimitriz09 As a workaround, I returned false in confirmStateChange of rememberModalBottomSheetState and it worked for me.

    val confirmStateChange: (ModalBottomSheetValue) -> Boolean = remember {
        { false }
    }

    val sheetState = rememberModalBottomSheetState(
        initialValue = ModalBottomSheetValue.Hidden,
        animationSpec = SwipeableDefaults.AnimationSpec,
        confirmStateChange = confirmStateChange
    )