Struct ScrollbarDrawInfo 

pub struct ScrollbarDrawInfo {

    pub bounds: WindowLogicalRect,
    pub orientation: ScrollbarOrientation,
    pub track_bounds: WindowLogicalRect,
    pub track_color: ColorU,
    pub thumb_bounds: WindowLogicalRect,
    pub thumb_color: ColorU,
    pub thumb_border_radius: BorderRadius,
    pub button_decrement_bounds: Option<WindowLogicalRect>,
    pub button_increment_bounds: Option<WindowLogicalRect>,
    pub button_color: ColorU,
    pub opacity_key: Option<OpacityKey>,
    pub thumb_transform_key: Option<TransformKey>,
    pub thumb_initial_transform: ComputedTransform3D,
    pub hit_id: Option<ScrollbarHitId>,
    pub clip_to_container_border: bool,
    pub container_border_radius: BorderRadius,
    pub visibility: ScrollbarVisibilityMode,
}

Complete drawing information for a scrollbar with all visual components.

This contains the resolved geometry and colors for all scrollbar parts:

• Track: The background area where the thumb slides
• Thumb: The draggable indicator showing current scroll position
• Buttons: Optional up/down or left/right arrow buttons
• Corner: The area where horizontal and vertical scrollbars meet

Fields

bounds: WindowLogicalRect

Overall bounds of the entire scrollbar (including track and buttons)

orientation: ScrollbarOrientation

Scrollbar orientation (horizontal or vertical)

track_bounds: WindowLogicalRect

Bounds of the track area

track_color: ColorU

Color of the track background

thumb_bounds: WindowLogicalRect

Bounds of the thumb

thumb_color: ColorU

Color of the thumb

thumb_border_radius: BorderRadius

Border radius for rounded thumb corners

button_decrement_bounds: Option<WindowLogicalRect>

Optional decrement button bounds (up/left arrow)

button_increment_bounds: Option<WindowLogicalRect>

Optional increment button bounds (down/right arrow)

button_color: ColorU

Color for buttons

opacity_key: Option<OpacityKey>

Optional opacity key for GPU-side fading animation.

thumb_transform_key: Option<TransformKey>

Optional transform key for GPU-side scrollbar thumb positioning. When present, the compositor will wrap the thumb in a PushReferenceFrame with PropertyBinding::Binding so WebRender can animate the thumb position without rebuilding the display list.

thumb_initial_transform: ComputedTransform3D

Initial transform for the scrollbar thumb (current scroll position). This is the transform applied when the display list is first built. During GPU-only scroll, synchronize_gpu_values updates this dynamically.

hit_id: Option<ScrollbarHitId>

Optional hit-test ID for WebRender hit-testing.

clip_to_container_border: bool

Whether to clip scrollbar to container’s border-radius

container_border_radius: BorderRadius

Container’s border-radius (for clipping)

visibility: ScrollbarVisibilityMode

Scrollbar visibility mode — used by back-registration to choose initial opacity. Always → initial opacity 1.0; WhenScrolling → initial opacity 0.0.

Trait Implementations

impl Clone for ScrollbarDrawInfo

fn clone(&self) -> ScrollbarDrawInfo

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScrollbarDrawInfo

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

Formats the value using the given formatter.