Struct Scrollbar 

pub struct Scrollbar {
    pub id: WidgetId,
    pub vertical: bool,
    pub thumb: Rect,
    pub track_start: f32,
    pub track_len: f32,
    pub thumb_len: f32,
    pub max: f32,
    pub reverse: bool,
    pub opacity: f32,
    pub reach: Rect,
    pub interactive: bool,
}

A scrollbar thumb (for hit-testing a drag).

Fields

id: WidgetId

The scrollable area the bar belongs to.

vertical: bool

Whether the bar runs vertically; otherwise it is horizontal.

thumb: Rect

The thumb’s rectangle, in absolute coordinates.

track_start: f32

Start and length of the track, along the axis.

track_len: f32

The track’s length along the axis.

thumb_len: f32

The thumb’s length along the axis.

max: f32

Offset maximal correspondant.

reverse: bool

The offsets of a reversed axis run the other way along the track: offset 0 is the far end, so the thumb rests there and a drag towards the start raises the number. See Scrollable::reverse_y.

opacity: f32

How present the bar is, 0.0..=1.0. A bar at zero is painted by nothing and cannot be grabbed — but it is still here, because a mouse that comes near it brings it back.

reach: Rect

The rectangle a mouse has to be inside for the bar to notice it: the track, widened to take in a tap target’s worth of room around the thumb. The reference reaches out like this on purpose (scrollbar.dart:762) — a bar 8 pixels wide, resting at a tenth of an opacity, is not something a hand aims at precisely.

interactive: bool

Whether a pointer can wake and drag it; not under an Android theme, where the bar only shows where the page is (milestone 617).

Trait Implementations

impl Clone for Scrollbar

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Scrollbar

impl Debug for Scrollbar

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

Formats the value using the given formatter.