Struct DateIndexedScrollbar 

pub struct DateIndexedScrollbar { /* private fields */ }

A modern chronological scrollbar face plus its ephemeral interaction state. It intentionally has no document binding: scroll position and density are per-user presentation preferences, not shared collection data.

Implementations

impl DateIndexedScrollbar

pub fn new(semantic_id: impl Into<String>) -> DateIndexedScrollbar

pub fn set_rect(&mut self, rect: Rect)

The narrow right-edge track used by the widget. Hosts may provide a wider rect for touch-first surfaces; the marker lane expands leftward.

pub fn rect(&self) -> Rect

pub fn is_dragging(&self) -> bool

pub fn set_focus(&mut self, focused: bool)

pub fn is_focused(&self) -> bool

pub fn preview(&self) -> Option<&DateIndexPreview>

pub fn contains_interaction_point(&self, point: Point) -> bool

Whether an immediate-mode host should offer this widget first refusal of a pointer press/release. It includes the visible track and the adjacent marker/preview lane, never the collection content itself.

pub fn position(metrics: ScrollMetrics) -> f64

Normalise an offset without trusting callers to have clamped it.

pub fn offset_for(metrics: ScrollMetrics, position: f64) -> f64

Convert an absolute position back into the host’s logical offset.

pub fn project_markers( &self, markers: &[DateIndexMarker], limit: usize, ) -> Vec<ProjectedDateMarker>

Project date markers into at most limit legible ticks. Major boundaries and the first/last available boundary are retained first; the remainder is evenly sampled in stable chronological order. The operation is O(n) over the already-small boundary list and produces a bounded result for paint and AT export.

pub fn pointer_moved( &mut self, cursor: Point, metrics: ScrollMetrics, markers: &[DateIndexMarker], ) -> Option<DateIndexIntent>

Pointer movement updates the hover label and, while captured, returns an absolute scroll target. Call it even after the cursor leaves the track; that is what makes a thumb drag reliable.

pub fn press( &mut self, metrics: ScrollMetrics, markers: &[DateIndexMarker], ) -> Option<DateIndexIntent>

Press on a marker jumps precisely to that date; press on the thumb starts a captured drag; press elsewhere on the track follows the standard shared scrollbar page behaviour.

pub fn release(&mut self) -> bool

pub fn wheel( &self, delta: MouseScrollDelta, metrics: ScrollMetrics, ) -> Option<DateIndexIntent>

Convert a regular scroll wheel / two-finger scroll delta into an absolute timeline position. The host may decline this when another focused surface owns the gesture.

pub fn key(&self, key: &Key, metrics: ScrollMetrics) -> Option<DateIndexIntent>

Keyboard parity for pointer behaviour. The normal arrows nudge the position, Page keys move a viewport, Home/End jump to endpoints, and +/- expose density without requiring a trackpad gesture.

pub fn handle_event( &mut self, event: &WindowEvent, scale_factor: f64, metrics: ScrollMetrics, markers: &[DateIndexMarker], ) -> Option<DateIndexIntent>

Translate a winit event for immediate-mode hosts. This deliberately does not consume pinch gestures: the collection needs the raw pinch anchor to keep the same item under a user’s fingers while density changes, so PinchGesture is exposed as an integration seam instead.

pub fn accessibility( &self, metrics: ScrollMetrics, markers: &[DateIndexMarker], ) -> AccessNode

Stable synthetic semantics for a custom canvas host. The slider is one focus target; projected major/minor boundaries are discoverable jump buttons, bounded with the same projection as paint.

pub fn perform_access_action( &mut self, target: &str, action: &Action, metrics: ScrollMetrics, markers: &[DateIndexMarker], ) -> Option<DateIndexIntent>

Route AT value and jump actions through the same intent path as real pointer/keyboard input. Hosts should use this instead of separately mutating their scroll state from accessibility actions.

pub fn paint( &self, scene: &mut Scene, transform: Affine, text_renderer: &mut TextRenderer, theme: &Theme, metrics: ScrollMetrics, markers: &[DateIndexMarker], )

Paint the shared face. No animation is required for meaning: hover, focus, and dragging all have static high-contrast affordances, so reduced-motion themes retain every piece of feedback.

Trait Implementations

impl Clone for DateIndexedScrollbar

fn clone(&self) -> DateIndexedScrollbar

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DateIndexedScrollbar

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.