Struct LayoutScrollArea 

pub struct LayoutScrollArea { /* private fields */ }

Implementations

impl LayoutScrollArea

pub fn new( layout_style: LayoutStyle, content: Box<dyn LayoutItem>, ) -> Result<LayoutScrollArea, LayoutError>

pub fn new_with<F>( layout_style: LayoutStyle, build: F, ) -> Result<LayoutScrollArea, LayoutError>

where F: FnOnce(ScrollViewport) -> Result<Box<dyn LayoutItem>, LayoutError>,

Like new, but the content is built with access to this scroll’s live ScrollViewport, so descendants can gate work (e.g. lazy asset loading) on whether they are currently on screen. The offset/viewport signals are created BEFORE build runs, so the content it returns can capture them — resolving the ordering bind where the scroll is built from its own content yet the content needs the scroll’s signals.

pub fn new_kept<F>( key: &'static str, layout_style: LayoutStyle, build: F, ) -> Result<LayoutScrollArea, LayoutError>

where F: FnOnce(ScrollViewport) -> Result<Box<dyn LayoutItem>, LayoutError>,

A scroll area whose position the surface keeps under key, so it survives a rebuild of the tree.

The usual spelling of new_keeping: a remounted view — a shell following a config edit, a page rebuilt under the same window — reopens where the reader left it instead of snapping to the top. key names this viewport among everything else the surface keeps, so two scroll areas on one surface need two keys (see kept).

pub fn new_keeping<F>( layout_style: LayoutStyle, offset: (RwSignal<f32>, RwSignal<f32>), build: F, ) -> Result<LayoutScrollArea, LayoutError>

where F: FnOnce(ScrollViewport) -> Result<Box<dyn LayoutItem>, LayoutError>,

Like new_with, but against offset signals the caller owns — so the scroll position can outlive this widget.

For a tree that is rebuilt while its surface stays (a shell following a config edit, a view remounted under the same window): a scroll area built with fresh signals starts at the top every time, which reads as the list jumping back under the reader’s hands. Hand it the same pair on every build and the view is where they left it. new_kept is this with the surface holding the pair.

pub fn clamp_scroll(&mut self)

pub fn scroll_to_top(&mut self)

Resets the scroll offset to the top-left, e.g. when swapping the content shown in the viewport.

pub fn viewport_rect(&self) -> Rect

Trait Implementations

impl Component for LayoutScrollArea

fn view(&self) -> RenderNode

fn on_event(&mut self, event: &Event) -> EventResult

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

Human-readable widget type name for the devtools tree inspector.

impl Drop for LayoutScrollArea

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.