Struct AutoScroll 

pub struct AutoScroll {
    pub last_drag_position: Option<Point<Pixels>>,
    /* private fields */
}

Manages timer-based auto-scrolling during drag interactions.

Delta convention: positive moves toward the bottom and negative moves toward the top.

Fields

last_drag_position: Option<Point<Pixels>>

Last drag position, available to the interaction that owns selection.

Implementations

impl AutoScroll

pub fn delta(&self) -> Option<Pixels>

Returns the current scroll delta.

pub fn compute_delta(y: Pixels, bounds: Bounds<Pixels>) -> Option<Pixels>

Computes the scroll delta for a pointer Y position within the viewport.

pub fn set<T, F>( &mut self, delta: Option<Pixels>, cx: &mut Context<'_, T>, tick: F, )

where T: 'static, F: Fn(Pixels, &mut T, &mut Context<'_, T>) + Send + 'static,

Updates the scroll delta and starts the background task when needed.

tick is called each frame (~60 fps) with the current delta. It should perform the actual scroll action for this entity.

pub fn is_active(&self) -> bool

Returns whether automatic scrolling is active.

pub fn stop(&mut self)

Stops automatic scrolling and clears the last drag position.

Trait Implementations

impl Default for AutoScroll

fn default() -> AutoScroll

Returns the “default value” for a type.