SelectableChip

Functions summary

Unit
@Composable
SelectableChip(
    selected: Boolean,
    onClick: (Boolean) -> Unit,
    label: @Composable RowScope.() -> Unit,
    modifier: Modifier,
    appIcon: (@Composable BoxScope.() -> Unit)?,
    secondaryLabel: (@Composable RowScope.() -> Unit)?,
    colors: SelectableChipColors,
    enabled: Boolean,
    interactionSource: MutableInteractionSource?,
    contentPadding: PaddingValues,
    shape: Shape,
    selectionControl: @Composable () -> Unit
)

A SelectableChip is a specialized type of Chip that includes a slot for a bi-state selection control such as a radio button.

Functions

SelectableChip

@Composable
fun SelectableChip(
    selected: Boolean,
    onClick: (Boolean) -> Unit,
    label: @Composable RowScope.() -> Unit,
    modifier: Modifier = Modifier,
    appIcon: (@Composable BoxScope.() -> Unit)? = null,
    secondaryLabel: (@Composable RowScope.() -> Unit)? = null,
    colors: SelectableChipColors = SelectableChipDefaults.selectableChipColors(),
    enabled: Boolean = true,
    interactionSource: MutableInteractionSource? = null,
    contentPadding: PaddingValues = SelectableChipDefaults.ContentPadding,
    shape: Shape = MaterialTheme.shapes.large,
    selectionControl: @Composable () -> Unit = {
        RadioButton(selected = selected, enabled = enabled)
    }
): Unit

A SelectableChip is a specialized type of Chip that includes a slot for a bi-state selection control such as a radio button. This overload provides suitable accessibility semantics for a selectable control like RadioButton. For toggleable controls like Checkbox and Switch, use ToggleChip instead.

The Wear Material SelectableChip offers four slots and a specific layout for an application icon, a label, a secondaryLabel and selection control. The application icon and secondaryLabel are optional. The items are laid out in a row with the optional icon at the start, a column containing the two label slots in the middle and a slot for the selection control at the end.

The SelectableChip is Stadium shaped and has a max height designed to take no more than two lines of text of Typography.button style. With localisation and/or large font sizes, the SelectableChip height adjusts to accommodate the contents. The label and secondary label should be consistently aligned.

The recommended set of SelectableChipColors can be obtained from SelectableChipDefaults, e.g. SelectableChipDefaults.selectableChipColors.

Chips can be enabled or disabled. A disabled chip will not respond to click events.

Example of a SelectableChip with an icon, label and secondary label (defaults to radio button):

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.wear.compose.material.Icon
import androidx.wear.compose.material.SelectableChip
import androidx.wear.compose.material.Text

var selectedRadioIndex by remember { mutableStateOf(0) }
Column(
    modifier = Modifier.fillMaxSize(),
    verticalArrangement = Arrangement.Center,
    horizontalAlignment = Alignment.CenterHorizontally,
) {
    SelectableChip(
        modifier = Modifier.fillMaxWidth(),
        selected = selectedRadioIndex == 0,
        onClick = { selectedRadioIndex = 0 },
        label = {
            // The primary label should have a maximum 3 lines of text
            Text("Primary label", maxLines = 3, overflow = TextOverflow.Ellipsis)
        },
        secondaryLabel = {
            // and the secondary label should have max 2 lines of text.
            Text("Secondary label", maxLines = 2, overflow = TextOverflow.Ellipsis)
        },
        appIcon = {
            Icon(
                painter = painterResource(id = R.drawable.ic_airplanemode_active_24px),
                contentDescription = "airplane",
                modifier = Modifier.size(24.dp).wrapContentSize(align = Alignment.Center),
            )
        },
        enabled = true,
    )
    Spacer(modifier = Modifier.height(8.dp))
    SelectableChip(
        modifier = Modifier.fillMaxWidth(),
        selected = selectedRadioIndex == 1,
        onClick = { selectedRadioIndex = 1 },
        label = {
            // The primary label should have a maximum 3 lines of text
            Text("Alternative label", maxLines = 3, overflow = TextOverflow.Ellipsis)
        },
        secondaryLabel = {
            // and the secondary label should have max 2 lines of text.
            Text("Alternative secondary", maxLines = 2, overflow = TextOverflow.Ellipsis)
        },
        appIcon = {
            Icon(
                painter = painterResource(id = R.drawable.ic_airplanemode_active_24px),
                contentDescription = "airplane",
                modifier = Modifier.size(24.dp).wrapContentSize(align = Alignment.Center),
            )
        },
        enabled = true,
    )
}

For more information, see the Toggle Chips guide.

Parameters
selected: Boolean

Boolean flag indicating whether this button is currently selected.
onClick: (Boolean) -> Unit

Callback to be invoked when this button is selected.
label: @Composable RowScope.() -> Unit

A slot for providing the chip's main label. The contents are expected to be text which is "start" aligned.
modifier: Modifier = Modifier

Modifier to be applied to the chip
appIcon: (@Composable BoxScope.() -> Unit)? = null

An optional slot for providing an icon to indicate the purpose of the chip. The contents are expected to be a horizontally and vertically centre aligned icon of size SelectableChipDefaults.IconSize. In order to correctly render when the Chip is not enabled the icon must set its alpha value to LocalContentAlpha.
secondaryLabel: (@Composable RowScope.() -> Unit)? = null

A slot for providing the chip's secondary label. The contents are expected to be text which is "start" aligned if there is an icon preset and "start" or "center" aligned if not. label and secondaryLabel contents should be consistently aligned.
colors: SelectableChipColors = SelectableChipDefaults.selectableChipColors()

SelectableChipColors that will be used to resolve the background and content color for this chip in different states, see SelectableChipDefaults.selectableChipColors.
enabled: Boolean = true

Controls the enabled state of the chip. When false, this chip will not be clickable
interactionSource: MutableInteractionSource? = null

an optional hoisted MutableInteractionSource for observing and emitting Interactions for this chip's "selectable" tap area. You can use this to change the chip's appearance or preview the chip in different states. Note that if null is provided, interactions will still happen internally.
contentPadding: PaddingValues = SelectableChipDefaults.ContentPadding

The spacing values to apply internally between the container and the content
shape: Shape = MaterialTheme.shapes.large

Defines the chip's shape. It is strongly recommended to use the default as this shape is a key characteristic of the Wear Material Theme
selectionControl: @Composable () -> Unit = { RadioButton(selected = selected, enabled = enabled) }

A slot for providing the chip's selection control. One built-in type of selection control is supported, see RadioButton. For Checkbox and Switch, use ToggleChip in order to provide the correct semantics for accessibility.