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Add deadzones to drag and drop

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This commit is contained in:
Kay Simmons 2022-12-07 17:46:00 -08:00
parent 1920de81d9
commit 36bc90b2b8
1 changed files with 41 additions and 3 deletions
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44
crates/drag_and_drop/src/drag_and_drop.rs
View File

@ -9,11 +9,17 @@ use gpui::{
View, WeakViewHandle,
};
const DEAD_ZONE: f32 = 4.;
enum State<V: View> {
Down {
region_offset: Vector2F,
region: RectF,
},
DeadZone {
region_offset: Vector2F,
region: RectF,
},
Dragging {
window_id: usize,
position: Vector2F,
@ -35,6 +41,13 @@ impl<V: View> Clone for State<V> {
region_offset,
region,
},
&State::DeadZone {
region_offset,
region,
} => State::DeadZone {
region_offset,
region,
},
State::Dragging {
window_id,
position,
@ -101,7 +114,7 @@ impl<V: View> DragAndDrop<V> {
pub fn drag_started(event: MouseDown, cx: &mut EventContext) {
cx.update_global(|this: &mut Self, _| {
this.currently_dragged = Some(State::Down {
region_offset: event.region.origin() - event.position,
region_offset: event.position - event.region.origin(),
region: event.region,
});
})
@ -122,7 +135,31 @@ impl<V: View> DragAndDrop<V> {
region_offset,
region,
})
| Some(&State::Dragging {
| Some(&State::DeadZone {
region_offset,
region,
}) => {
if (dbg!(event.position) - (dbg!(region.origin() + region_offset))).length()
> DEAD_ZONE
{
this.currently_dragged = Some(State::Dragging {
window_id,
region_offset,
region,
position: event.position,
payload,
render: Rc::new(move |payload, cx| {
render(payload.downcast_ref::<T>().unwrap(), cx)
}),
});
} else {
this.currently_dragged = Some(State::DeadZone {
region_offset,
region,
})
}
}
Some(&State::Dragging {
region_offset,
region,
..
@ -151,6 +188,7 @@ impl<V: View> DragAndDrop<V> {
.and_then(|state| {
match state {
State::Down { .. } => None,
State::DeadZone { .. } => None,
State::Dragging {
window_id,
region_offset,
@ -163,7 +201,7 @@ impl<V: View> DragAndDrop<V> {
return None;
}
let position = position + region_offset;
let position = position - region_offset;
Some(
Overlay::new(
MouseEventHandler::<DraggedElementHandler>::new(0, cx, |_, cx| {