Struct ScrollbarDrag

pub struct ScrollbarDrag {
    pub axis: ScrollbarAxis,
    pub grab_offset: f32,
}

Pointer-relative state retained while dragging one scrollbar thumb.

Examples

use ailloli_ui_core::ScrollbarAxis;
assert_eq!(format!("{:?}", ScrollbarAxis::Horizontal), "Horizontal");

Fields

axis: ScrollbarAxis

Axis captured when the drag began.

grab_offset: f32

Logical-pixel distance from the thumb start to the pressed point.

Implementations

impl ScrollbarDrag

pub fn target_offset(self, point: Point, geometry: ScrollbarGeometry) -> f32

Maps the current pointer position to a clamped logical content offset.

A geometry for another axis or a track with no thumb travel returns zero. Movement outside the track is accepted and clamped.

Examples

use ailloli_ui_core::{Point, Rect, ScrollMetrics, ScrollState, ScrollbarAxis, ScrollbarGeometrySpec, Size};
let geometry = ScrollbarGeometrySpec::new(
    ScrollbarAxis::Horizontal,
    Rect::new(0.0, 0.0, 100.0, 60.0),
    ScrollMetrics::new(Size::new(100.0, 60.0), Size::new(300.0, 60.0)),
    ScrollState::new(),
).resolve().unwrap();
let drag = geometry.begin_drag(Point::new(geometry.thumb.x, geometry.thumb.y)).unwrap();
assert_eq!(drag.target_offset(Point::new(10_000.0, 0.0), geometry), geometry.max_offset);

Trait Implementations

impl Clone for ScrollbarDrag

fn clone(&self) -> ScrollbarDrag

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ScrollbarDrag

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

Formats the value using the given formatter.

impl PartialEq for ScrollbarDrag

fn eq(&self, other: &ScrollbarDrag) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ScrollbarDrag

impl StructuralPartialEq for ScrollbarDrag