Struct GestureDetectorView 

pub struct GestureDetectorView<State>
where
    State: 'static,
{ /* private fields */ }

A declarative gesture wrapper. See the module docs.

Implementations

impl<State> GestureDetectorView<State>

where State: 'static,

pub fn on_tap<F>(self, on_tap: F) -> GestureDetectorView<State>

where F: Fn(&mut State) + 'static,

Fire on_tap when the child is tapped (a press+release within TOUCH_SLOP and shorter than [LONG_PRESS_MS]).

pub fn on_long_press<F>(self, on_long_press: F) -> GestureDetectorView<State>

where F: Fn(&mut State) + 'static,

Fire on_long_press when the child is pressed and held past [LONG_PRESS_MS] without moving beyond TOUCH_SLOP. Composes with on_tap: a given press fires exactly one of the two, never both (see the module docs for the firing semantics).

pub fn on_hold_progress<F>( self, on_hold_progress: F, ) -> GestureDetectorView<State>

where F: Fn(&mut State, f64) + 'static,

Observe press-hold progress (0.0..=1.0 against hold_threshold_ms, default [LONG_PRESS_MS]) while the child is held — the primitive a charge-up ring or similar hold feedback widget renders from. See the module docs for the delivery/firing semantics: paint-clock timed, delivered on the next pointer event, with a final 0.0 on an early lift/drag-past-slop or a final 1.0 on reaching the threshold.

Cancel staleness gap: a platform PointerPhase::Cancel (gesture steal or structural teardown) delivers no final observation — the last value this callback saw stays stale until the next full press cycle. See the module docs for the consumer-side reset idiom that self-corrects on the next touch-down rather than waiting for a full press-release.

pub fn hold_threshold_ms(self, ms: u64) -> GestureDetectorView<State>

Override the hold threshold (milliseconds), used by both on_long_press and on_hold_progress; defaults to [LONG_PRESS_MS].

Resolved with a floor of 1ms (ms.max(1)) at both build/rebuild — hold_threshold_ms(0) never divides progress by zero (f64::clamp passes a NaN numerator/denominator-zero result straight through rather than clamping it away), so it instead yields a defined, finite progress that reaches 1.0 on the very next paint.

Trait Implementations

impl<State> View<State> for GestureDetectorView<State>

where State: 'static,

type Element = GestureDetectorWidget

The retained widget this view produces.

fn build(&self, ctx: &mut BuildCtx<'_>) -> GestureDetectorWidget

Materialise a fresh widget for this view.

fn rebuild( &self, prev: &GestureDetectorView<State>, element: &mut GestureDetectorWidget, ctx: &mut BuildCtx<'_>, ) -> ChangeFlags

Reconcile prev (the previous view of the same type) against the live element, mutating it in place and reporting what changed.

fn teardown(&self, element: &mut GestureDetectorWidget, ctx: &mut BuildCtx<'_>)

Tear down element when this view is being removed.

fn message(&self, _element: &mut Self::Element, _state: &mut State)

Deliver an event message to this view, mutating application state.