Struct ScrollWidget 

pub struct ScrollWidget { /* private fields */ }

The retained widget for a ScrollView: a thin owner of the viewport geometry (its own size, the child’s measured content, the child origin) around the crate’s shared scroll surface core, which runs the drag, fling, overscroll, nested-claim and controller machinery (the module docs’ Shared core).

Implementations

impl ScrollWidget

pub fn offset(&self) -> f64

The current scroll offset.

pub fn max_offset(&self) -> f64

The maximum scroll offset (content − viewport, never negative).

pub fn is_flinging(&self) -> bool

Whether post-release motion is in flight — the legacy fling, or a physics-supplied Simulation the generic driver is running (never both, and never either one under RubberBand’s legacy-only path).

pub fn settle_tick(&mut self, dt_ms: f64) -> bool

Advance a release-settle by dt_ms, easing the effective offset back to its clamped edge and returning whether it is still animating. Pure and deterministic (mirrors ScrollWidget::tick); the paint pump and the tests both drive it.

pub fn tick(&mut self, dt_ms: f64) -> bool

Advance an in-flight fling by dt_ms, returning whether it is still animating. Pure and deterministic — the paint-time pump and the tests both drive it.

Trait Implementations

impl Widget for ScrollWidget

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

Choose a size within bc and return it. The chosen size must satisfy bc (callers may additionally clamp via BoxConstraints::constrain).

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

Emit draw commands for this widget into scene.

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

Handle an input event, optionally mutating application state through ctx and reporting whether it was consumed.

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

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

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.

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

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).