Picker

Composable Component

A scrollable list of items to pick from. By default, items will be repeated "infinitely" in both directions, unless PickerState#repeatItems is specified as false.

Android

@Composable
public fun Picker(
    state: PickerState,
    contentDescription: (() -> String)?,
    modifier: Modifier = Modifier,
    readOnly: Boolean = false,
    readOnlyLabel: @Composable (BoxScope.() -> Unit)? = null,
    onSelected: () -> Unit = {},
    verticalSpacing: Dp = 0.dp,
    @FloatRange(from = 0.0, to = 0.5) gradientRatio: Float = PickerDefaults.GradientRatio,
    gradientColor: Color = MaterialTheme.colorScheme.background,
    userScrollEnabled: Boolean = true,
    rotaryScrollableBehavior: RotaryScrollableBehavior? = PickerDefaults.rotarySnapBehavior(state),
    option: @Composable PickerScope.(index: Int) -> Unit,
)

Parameters


state	The state of the component
contentDescription	A block which computes text used by accessibility services to describe what the selected option represents. This text should be localized, such as by using `androidx.compose.ui.res.stringResource` or similar.
modifier	`Modifier` to be applied to the Picker.
readOnly	Determines whether the `Picker` should display other available options for this field, inviting the user to scroll to change the value. When readOnly = true, only displays the currently selected option (and optionally a label). This is intended to be used for screens that display multiple Pickers, only one of which has the focus at a time.
readOnlyLabel	A slot for providing a label, displayed above the selected option when the `Picker` is read-only. The label is overlaid with the currently selected option within a Box, so it is recommended that the label is given `Alignment.TopCenter`.
onSelected	Action triggered when the Picker is selected by clicking. Used by accessibility semantics, which facilitates implementation of multi-picker screens.
verticalSpacing	The amount of vertical spacing in `Dp` between items. Can be negative, which can be useful for Text if it has plenty of whitespace.
gradientRatio	The size relative to the Picker height that the top and bottom gradients take. These gradients blur the picker content on the top and bottom. The default is 0.33, so the top 1/3 and the bottom 1/3 of the picker are taken by gradients. Should be between 0.0 and 0.5. Use 0.0 to disable the gradient.
gradientColor	Should be the color outside of the Picker, so there is continuity.
userScrollEnabled	Determines whether the picker should be scrollable or not. When userScrollEnabled = true, picker is scrollable. This is different from `readOnly` as it changes the scrolling behaviour.
rotaryScrollableBehavior	Parameter for changing rotary behavior. We recommend to use `PickerDefaults.rotarySnapBehavior` for Pickers, but passing null turns off the rotary handling if it is not required.
option	A block which describes the content. Inside this block you can reference `PickerScope.selectedOptionIndex` to determine which option is selected. When read-only mode is in use on a screen, it is recommended that this content is given `Alignment.Center` in order to align with the centrally selected Picker value.