Struct DragTargetView 

pub struct DragTargetView<State: 'static, T: 'static> { /* private fields */ }

A declarative drop target. See the module docs.

Implementations

impl<State: 'static, T: 'static> DragTargetView<State, T>

pub fn accepts<F: Fn(&T) -> bool + 'static>(self, f: F) -> Self

Only accept a payload f returns true for (default: accept every T). A payload that fails this shows DragHighlight::Reject and is never taken — see the module docs.

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

Run f against the app state when a session carrying a T first hovers this target.

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

Run f against the app state when a hovering T session stops hovering this target without dropping on it.

pub fn on_hover<F: Fn(&mut State, Point) + 'static>(self, f: F) -> Self

Run f against the app state, with the pointer converted to this widget’s local space, on every distinct pointer position seen while a T session hovers this target.

pub fn on_drop<F: Fn(&mut State, T) + 'static>(self, f: F) -> Self

Run f against the app state with the dropped payload when an accepted T session is released on this target.

pub fn highlight<F: Fn(&mut dyn PaintScene, Size, DragHighlight) + 'static>( self, f: F, ) -> Self

Override the highlight paint seam (default: a 2px rounded inset stroke in the theme’s primary color). See the module docs.

Trait Implementations

impl<State: 'static, T: 'static> View<State> for DragTargetView<State, T>

type Element = DragTargetWidget<State, T>

The retained widget this view produces.

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

Materialise a fresh widget for this view.

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