Struct SliverFixedExtentListWidget 

pub struct SliverFixedExtentListWidget { /* private fields */ }

The retained widget for a SliverFixedExtentListView: the materialised rows, the constraints rebuild windows against, and the near-edge state.

Implementations

impl SliverFixedExtentListWidget

pub fn window(&self) -> &[usize]

The item indices currently materialised, ascending.

pub fn item_count(&self) -> usize

How many items the list holds.

Trait Implementations

impl SliverWidget for SliverFixedExtentListWidget

fn layout_sliver( &mut self, ctx: &mut LayoutCtx<'_>, sc: &SliverConstraints, ) -> SliverGeometry

Lay the sliver out under sc and report its geometry, which must satisfy SliverGeometry::debug_assert_valid against sc.

impl Widget for SliverFixedExtentListWidget

fn layout(&mut self, ctx: &mut LayoutCtx<'_>, bc: &BoxConstraints) -> Size

Outside a viewport the list lays out as if it were the only sliver of a viewport bc.max() long, scrolled to its start: it materialises (at the next rebuild) and sizes itself to the rows that fit, or to all of them under an unbounded constraint.

fn event(&mut self, ctx: &mut EventCtx<'_>, event: &InputEvent) -> EventResult

Delivers a near-edge fire observed at layout, then routes the event to the rows: the viewport only delivers a positional event inside this sliver’s paint extent, where only painted rows sit.

fn paint(&mut self, ctx: &mut PaintCtx<'_>, scene: &mut dyn PaintScene)

Emit draw commands for this widget into scene.

fn semantics(&self, ctx: &mut SemanticsCtx)

Contribute this widget’s accessibility node(s) into ctx.

fn as_sliver(&mut self) -> Option<&mut dyn SliverWidget>

This widget as a sliver, if it speaks the sliver protocol — the opt-in seam a scrolling viewport lays its children out through (see crate::sliver and ChildPod::layout_sliver_child).

fn visit_children(&self, visitor: &mut dyn FnMut(&ChildPod))

Visit this widget’s owned ChildPods, in declaration (paint) order — the read-only seam that makes the retained hierarchy enumerable.

fn type_name(&self) -> &'static str

This widget’s concrete type name, for read-only tooling.