Struct TouchPointerEmulator 

pub struct TouchPointerEmulator { /* private fields */ }

Converts direct touch into the toolkit’s ordinary pointer contract.

• One finger: a tap is a left click, a drag scrolls, and a still 500 ms hold is a secondary click (the context menu). Press is deliberately delayed until touch-end: many controls activate on pointer-down, so emitting it earlier would toggle a checkbox before a scroll or edge swipe had enough movement to cancel the tap.
• Two fingers: TouchGestureArena arbitrates a pinch (PinchGesture, anchored at the fingers’ centre) from a pan (pixel scroll), so every pinch-aware view zooms on a touchscreen exactly as on a touchpad.
• A contact that begins on a widget claiming raw touch (Widget::claims_raw_touch) produces no pointer events at all and never cancels, or is cancelled by, another finger; that widget handles its WindowEvent::Touch stream itself.

Implementations

impl TouchPointerEmulator

pub const LONG_PRESS: Duration

pub fn events( &mut self, touch: &Touch, claims_raw: impl FnOnce(PhysicalPosition<f64>) -> bool, ) -> Vec<TouchPointerEvent>

Translate one contact update. claims_raw is asked only when a contact begins, with its physical position.

pub fn long_press_deadline(&self) -> Option<Instant>

When a still single-finger hold becomes a long press, if one is armed.

pub fn poll( &mut self, now: Instant, ) -> Option<(DeviceId, Vec<TouchPointerEvent>)>

Fire a long press whose deadline has passed: a secondary click where the finger rests. The finger’s eventual lift then does nothing.

Trait Implementations

impl Default for TouchPointerEmulator

fn default() -> TouchPointerEmulator

Returns the “default value” for a type.