TriStateCheckbox

Component in Material 3 Compose

Checkboxes can have a parent-child relationship with other checkboxes. When the parent checkbox is checked, all child checkboxes are checked. If a parent checkbox is unchecked, all child checkboxes are unchecked. If some, but not all, child checkboxes are checked, the parent checkbox becomes an indeterminate checkbox.

Last updated: 2024-10-22 13:47

Installation

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

Overloads

@Composable
fun TriStateCheckbox(
    state: ToggleableState,
    onClick: (() -> Unit)?,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    colors: CheckboxColors = CheckboxDefaults.colors(),
    interactionSource: MutableInteractionSource? = null
)

Parameters

name	description
state	whether this checkbox is checked, unchecked, or in an indeterminate state
onClick	called when this checkbox is clicked. If null, then this checkbox will not be interactable, unless something else handles its input events and updates its [state].
modifier	the [Modifier] to be applied to this checkbox
enabled	controls the enabled state of this checkbox. When false, this component will not respond to user input, and it will appear visually disabled and disabled to accessibility services.
colors	[CheckboxColors] that will be used to resolve the colors used for this checkbox in different states. See [CheckboxDefaults.colors].
interactionSource	an optional hoisted [MutableInteractionSource] for observing and emitting [Interaction]s for this checkbox. You can use this to change the checkbox's appearance or preview the checkbox in different states. Note that if null is provided, interactions will still happen internally.

Code Example

TriStateCheckboxSample

@Preview
@Composable
fun TriStateCheckboxSample() {
    Column {
        // define dependent checkboxes states
        val (state, onStateChange) = remember { mutableStateOf(true) }
        val (state2, onStateChange2) = remember { mutableStateOf(true) }

        // TriStateCheckbox state reflects state of dependent checkboxes
        val parentState =
            remember(state, state2) {
                if (state && state2) ToggleableState.On
                else if (!state && !state2) ToggleableState.Off else ToggleableState.Indeterminate
            }
        // click on TriStateCheckbox can set state for dependent checkboxes
        val onParentClick = {
            val s = parentState != ToggleableState.On
            onStateChange(s)
            onStateChange2(s)
        }

        // The sample below composes just basic checkboxes which are not fully accessible on their
        // own. See the CheckboxWithTextSample as a way to ensure your checkboxes are fully
        // accessible.
        Row(
            verticalAlignment = Alignment.CenterVertically,
            modifier =
                Modifier.triStateToggleable(
                    state = parentState,
                    onClick = onParentClick,
                    role = Role.Checkbox
                )
        ) {
            TriStateCheckbox(
                state = parentState,
                onClick = null,
            )
            Text("Receive Emails")
        }
        Spacer(Modifier.size(25.dp))
        Column(Modifier.padding(24.dp, 0.dp, 0.dp, 0.dp)) {
            Row(
                verticalAlignment = Alignment.CenterVertically,
                modifier =
                    Modifier.toggleable(
                        value = state,
                        onValueChange = onStateChange,
                        role = Role.Checkbox
                    )
            ) {
                Checkbox(state, null)
                Text("Daily")
            }
            Spacer(Modifier.size(25.dp))
            Row(
                verticalAlignment = Alignment.CenterVertically,
                modifier =
                    Modifier.toggleable(
                        value = state2,
                        onValueChange = onStateChange2,
                        role = Role.Checkbox
                    )
            ) {
                Checkbox(state2, null)
                Text("Weekly")
            }
        }
    }
}