ExtendedFloatingActionButton

Component in Material 3 Compose

Extended FABs help people take primary actions. They're wider than FABs to accommodate a text label and larger target area.

Last updated: 2024-10-22 13:47

Installation

dependencies {
   implementation("androidx.compose.material3:material3:1.4.0-alpha02")
}

Overloads

@Composable
fun ExtendedFloatingActionButton(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    shape: Shape = FloatingActionButtonDefaults.extendedFabShape,
    containerColor: Color = FloatingActionButtonDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    elevation: FloatingActionButtonElevation = FloatingActionButtonDefaults.elevation(),
    interactionSource: MutableInteractionSource? = null,
    content: @Composable RowScope.() -> Unit,
)

Parameters

name	description
onClick	called when this FAB is clicked
modifier	the [Modifier] to be applied to this FAB
shape	defines the shape of this FAB's container and shadow (when using [elevation])
containerColor	the color used for the background of this FAB. Use [Color.Transparent] to have no color.
contentColor	the preferred color for content inside this FAB. Defaults to either the matching content color for [containerColor], or to the current [LocalContentColor] if [containerColor] is not a color from the theme.
elevation	[FloatingActionButtonElevation] used to resolve the elevation for this FAB in different states. This controls the size of the shadow below the FAB. Additionally, when the container color is [ColorScheme.surface], this controls the amount of primary color applied as an overlay. See also: [Surface].
interactionSource	an optional hoisted [MutableInteractionSource] for observing and emitting [Interaction]s for this FAB. You can use this to change the FAB's appearance or preview the FAB in different states. Note that if null is provided, interactions will still happen internally.
content	the content of this FAB, typically a [Text] label

@Composable
fun ExtendedFloatingActionButton(
    text: @Composable () -> Unit,
    icon: @Composable () -> Unit,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    expanded: Boolean = true,
    shape: Shape = FloatingActionButtonDefaults.extendedFabShape,
    containerColor: Color = FloatingActionButtonDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    elevation: FloatingActionButtonElevation = FloatingActionButtonDefaults.elevation(),
    interactionSource: MutableInteractionSource? = null,
)

Parameters

name	description
text	label displayed inside this FAB
icon	icon for this FAB, typically an [Icon]
onClick	called when this FAB is clicked
modifier	the [Modifier] to be applied to this FAB
expanded	controls the expansion state of this FAB. In an expanded state, the FAB will show both the [icon] and [text]. In a collapsed state, the FAB will show only the [icon].
shape	defines the shape of this FAB's container and shadow (when using [elevation])
containerColor	the color used for the background of this FAB. Use [Color.Transparent] to have no color.
contentColor	the preferred color for content inside this FAB. Defaults to either the matching content color for [containerColor], or to the current [LocalContentColor] if [containerColor] is not a color from the theme.
elevation	[FloatingActionButtonElevation] used to resolve the elevation for this FAB in different states. This controls the size of the shadow below the FAB. Additionally, when the container color is [ColorScheme.surface], this controls the amount of primary color applied as an overlay. See also: [Surface].
interactionSource	an optional hoisted [MutableInteractionSource] for observing and emitting [Interaction]s for this FAB. You can use this to change the FAB's appearance or preview the FAB in different states. Note that if null is provided, interactions will still happen internally.

Code Examples

ExtendedFloatingActionButtonTextSample

@Preview
@Composable
fun ExtendedFloatingActionButtonTextSample() {
    ExtendedFloatingActionButton(onClick = { /* do something */ }) { Text(text = "Extended FAB") }
}

ExtendedFloatingActionButtonSample

@Preview
@Composable
fun ExtendedFloatingActionButtonSample() {
    ExtendedFloatingActionButton(
        onClick = { /* do something */ },
        icon = { Icon(Icons.Filled.Add, "Localized description") },
        text = { Text(text = "Extended FAB") },
    )
}

AnimatedExtendedFloatingActionButtonSample

@Preview
@Composable
fun AnimatedExtendedFloatingActionButtonSample() {
    val listState = rememberLazyListState()
    // The FAB is initially expanded. Once the first visible item is past the first item we
    // collapse the FAB. We use a remembered derived state to minimize unnecessary compositions.
    val expandedFab by remember { derivedStateOf { listState.firstVisibleItemIndex == 0 } }
    Scaffold(
        floatingActionButton = {
            ExtendedFloatingActionButton(
                onClick = { /* do something */ },
                expanded = expandedFab,
                icon = { Icon(Icons.Filled.Add, "Localized Description") },
                text = { Text(text = "Extended FAB") },
            )
        },
        floatingActionButtonPosition = FabPosition.End,
    ) {
        LazyColumn(state = listState, modifier = Modifier.fillMaxSize()) {
            for (index in 0 until 100) {
                item { Text(text = "List item - $index", modifier = Modifier.padding(24.dp)) }
            }
        }
    }
}