Struct DraggableView 

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

A declarative drag source. See the module docs.

Implementations

impl<State, T> DraggableView<State, T>

where State: 'static, T: 'static,

pub fn policy(self, policy: DragPolicy) -> DraggableView<State, T>

How a press becomes a drag (default DragPolicy::Auto).

pub fn threshold(self, px: f64) -> DraggableView<State, T>

The distance, in logical px, a press travels before it becomes a drag under the distance policy (default DRAG_THRESHOLD). Negative values clamp to zero.

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

How long, in ms, a press is held before it becomes a drag under the long-press policy (default the gesture detector’s long-press duration, 500 ms). Floored at 1 ms.

pub fn ghost<F, V>(self, ghost: F) -> DraggableView<State, T>

where F: Fn(&State) -> V + 'static, V: View<State>,

Build the ghost from the application state when the drag begins, instead of snapshotting the child. Sized by its own content, laid out loosely against the window, and painted at ghost_opacity. ghost may return any View; it is erased here.

use frust_widgets::{DragCoordinator, DraggableView, draggable, text};
draggable(text("card"), coordinator, |_: &()| 7u32).ghost(|_: &()| text("moving"))

pub fn ghost_opacity(self, opacity: f32) -> DraggableView<State, T>

The opacity the ghost is painted at (default GHOST_OPACITY), clamped to 0.0..=1.0.

pub fn while_dragging(self, feedback: SourceFeedback) -> DraggableView<State, T>

What the source looks like in place while it is dragged (default SourceFeedback::Dim).

Trait Implementations

impl<State, T> View<State> for DraggableView<State, T>

where State: 'static, T: 'static,

type Element = DraggableWidget<State, T>

The retained widget this view produces.

fn build( &self, ctx: &mut BuildCtx<'_>, ) -> <DraggableView<State, T> as View<State>>::Element

Materialise a fresh widget for this view.

fn rebuild( &self, prev: &DraggableView<State, T>, element: &mut <DraggableView<State, T> as View<State>>::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 <DraggableView<State, T> as View<State>>::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.