Struct ExpandableListView 

pub struct ExpandableListView<State: 'static> { /* private fields */ }

A declarative M3E expandable list. See the module docs.

Implementations

impl<State: 'static> ExpandableListView<State>

pub fn expanded(self, indices: impl IntoIterator<Item = usize>) -> Self

Mark these indices expanded (initiallyExpanded, then every later app-resolved set). The widget never writes this back.

pub fn outer_radius(self, radius: f64) -> Self

Override the outward corner radius of the first/last (and only) item. Defaults to EXPANDABLE_OUTER_RADIUS.

pub fn inner_radius(self, radius: f64) -> Self

Override the radius of every adjoining item edge. Defaults to EXPANDABLE_INNER_RADIUS.

pub fn hover_radius(self, radius: f64) -> Self

Override the inner radius used while an item is hovered. Defaults to EXPANDABLE_HOVER_RADIUS.

pub fn pressed_radius(self, radius: f64) -> Self

Override the inner radius used while an item is pressed. Defaults to EXPANDABLE_PRESSED_RADIUS.

pub fn expanded_radius(self, radius: f64) -> Self

Round an expanded item uniformly at radius, overriding its position radii entirely (M3EExpandableStyle.expandedRadius). Unset by default, as upstream.

pub fn gap(self, gap: f64) -> Self

Override the vertical gap between adjacent items. Defaults to EXPANDABLE_GAP.

pub fn color(self, color: Color) -> Self

Replace the item fill (M3EExpandableStyle.color), which otherwise resolves from colors.surface_container_highest.

pub fn haptic(self, haptic: HapticSignal) -> Self

Set the haptic fired immediately before on_toggle (M3EExpandableStyle.haptic). Defaults to HapticSignal::None.

pub fn on_toggle<F: Fn(&mut State, usize) + 'static>(self, on_toggle: F) -> Self

Fire on_toggle with an item’s index when its header is released inside itself. Without this the stack is inert chrome: no press state, no hover claim, and pointer events route straight into the children.

Trait Implementations

impl<State: 'static> View<State> for ExpandableListView<State>

type Element = ExpandableListWidget

The retained widget this view produces.

fn build(&self, ctx: &mut BuildCtx<'_>) -> ExpandableListWidget

Materialise a fresh widget for this view.

fn rebuild( &self, prev: &Self, element: &mut ExpandableListWidget, ctx: &mut BuildCtx<'_>, ) -> ChangeFlags

Reconcile prev (the previous view of the same type) against the live element, mutating it in place and reporting what changed.

fn teardown(&self, element: &mut ExpandableListWidget, ctx: &mut BuildCtx<'_>)

Tear down element when this view is being removed.

fn message(&self, _element: &mut Self::Element, _state: &mut State)

Deliver an event message to this view, mutating application state.