Struct PinchDetectorView 

pub struct PinchDetectorView<State: 'static> { /* private fields */ }

A declarative pinch wrapper. See the module docs.

Implementations

impl<State: 'static> PinchDetectorView<State>

pub fn on_scale<F: Fn(&mut State, ScaleEvent) + 'static>( self, on_scale: F, ) -> Self

Receive every Begin/Update/End of a two-finger pinch over the child, and every desktop InputEvent::Scale the child leaves unhandled.

Trait Implementations

impl<State: 'static> View<State> for PinchDetectorView<State>

type Element = PinchDetectorWidget

The retained widget this view produces.

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

Materialise a fresh widget for this view.

fn rebuild( &self, prev: &Self, element: &mut PinchDetectorWidget, 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 PinchDetectorWidget, 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.