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BottomSheetScaffold

Standard bottom sheets co-exist with the screen’s main UI region and allow for simultaneously viewing and interacting with both regions. They are commonly used to keep a feature or secondary content visible on screen when content in main UI region is frequently scrolled or panned.

Standard bottom sheet image

Last updated:

Installation

dependencies {
   implementation("androidx.compose.material:material:1.7.0-beta03")
}

Overloads

@Composable
@OptIn(ExperimentalMaterialApi::class
fun BottomSheetScaffold(
    sheetContent: @Composable ColumnScope.() -> Unit,
    modifier: Modifier = Modifier,
    scaffoldState: BottomSheetScaffoldState = rememberBottomSheetScaffoldState(),
    topBar: (@Composable () -> Unit)? = null,
    snackbarHost: @Composable (SnackbarHostState) -> Unit = { SnackbarHost(it) },
    floatingActionButton: (@Composable () -> Unit)? = null,
    floatingActionButtonPosition: FabPosition = FabPosition.End,
    sheetGesturesEnabled: Boolean = true,
    sheetShape: Shape = MaterialTheme.shapes.large,
    sheetElevation: Dp = BottomSheetScaffoldDefaults.SheetElevation,
    sheetBackgroundColor: Color = MaterialTheme.colors.surface,
    sheetContentColor: Color = contentColorFor(sheetBackgroundColor),
    sheetPeekHeight: Dp = BottomSheetScaffoldDefaults.SheetPeekHeight,
    backgroundColor: Color = MaterialTheme.colors.background,
    contentColor: Color = contentColorFor(backgroundColor),
    content: @Composable (PaddingValues) -> Unit
)

Parameters

namedescription
sheetContentThe content of the bottom sheet.
modifierAn optional [Modifier] for the root of the scaffold.
scaffoldStateThe state of the scaffold.
topBarAn optional top app bar.
snackbarHostThe composable hosting the snackbars shown inside the scaffold.
floatingActionButtonAn optional floating action button.
floatingActionButtonPositionThe position of the floating action button.
sheetGesturesEnabledWhether the bottom sheet can be interacted with by gestures.
sheetShapeThe shape of the bottom sheet.
sheetElevationThe elevation of the bottom sheet.
sheetBackgroundColorThe background color of the bottom sheet.
sheetContentColorThe preferred content color provided by the bottom sheet to its children. Defaults to the matching content color for [sheetBackgroundColor], or if that is not a color from the theme, this will keep the same content color set above the bottom sheet.
sheetPeekHeightThe height of the bottom sheet when it is collapsed. If the peek height equals the sheet's full height, the sheet will only have a collapsed state.
backgroundColorThe background color of the scaffold body.
contentColorThe color of the content in scaffold body. Defaults to either the matching content color for [backgroundColor], or, if it is not a color from the theme, this will keep the same value set above this Surface.
contentThe main content of the screen. You should use the provided [PaddingValues] to properly offset the content, so that it is not obstructed by the bottom sheet when collapsed.

Code Example

BottomSheetScaffoldSample

@OptIn(ExperimentalMaterialApi::class
@Composable
@Sampled
fun BottomSheetScaffoldSample() {
    val scope = rememberCoroutineScope()
    val scaffoldState = rememberBottomSheetScaffoldState()
    BottomSheetScaffold(
        sheetContent = {
            Box(
                Modifier
                    .fillMaxWidth()
                    .height(128.dp),
                contentAlignment = Alignment.Center
            ) {
                Text("Swipe up to expand sheet")
            }
            Column(
                Modifier
                    .fillMaxWidth()
                    .padding(64.dp),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Text("Sheet content")
                Spacer(Modifier.height(20.dp))
                Button(
                    onClick = {
                        scope.launch { scaffoldState.bottomSheetState.collapse() }
                    }
                ) {
                    Text("Click to collapse sheet")
                }
            }
        },
        scaffoldState = scaffoldState,
        topBar = {
            TopAppBar {
                Text("Bottom sheet scaffold")
            }
        },
        floatingActionButton = {
            var clickCount by remember { mutableStateOf(0) }
            FloatingActionButton(
                onClick = {
                    // show snackbar as a suspend function
                    scope.launch {
                        scaffoldState.snackbarHostState.showSnackbar("Snackbar #${++clickCount}")
                    }
                }
            ) {
                Icon(Icons.Default.Favorite, contentDescription = "Localized description")
            }
        },
        floatingActionButtonPosition = FabPosition.End,
        sheetPeekHeight = 128.dp
    ) { innerPadding ->
        LazyColumn(contentPadding = innerPadding) {
            items(100) {
                Box(
                    Modifier
                        .fillMaxWidth()
                        .height(50.dp)
                        .background(colors[it % colors.size])
                )
            }
        }
    }
}