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Allow dragging and dropping project entries

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This commit is contained in:
Kay Simmons 2022-11-10 20:43:55 -08:00
parent 738893c527
commit d61c0fb24c
2 changed files with 150 additions and 34 deletions
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80
crates/drag_and_drop/src/drag_and_drop.rs
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@ -4,12 +4,16 @@ use collections::HashSet;
use gpui::{
elements::{Empty, MouseEventHandler, Overlay},
geometry::{rect::RectF, vector::Vector2F},
scene::MouseDrag,
scene::{MouseDown, MouseDrag},
CursorStyle, Element, ElementBox, EventContext, MouseButton, MutableAppContext, RenderContext,
View, WeakViewHandle,
};
enum State<V: View> {
Down {
region_offset: Vector2F,
region: RectF,
},
Dragging {
window_id: usize,
position: Vector2F,
@ -24,6 +28,13 @@ enum State<V: View> {
impl<V: View> Clone for State<V> {
fn clone(&self) -> Self {
match self {
&State::Down {
region_offset,
region,
} => State::Down {
region_offset,
region,
},
State::Dragging {
window_id,
position,
@ -87,6 +98,15 @@ 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: event.region,
});
})
}
pub fn dragging<T: Any>(
event: MouseDrag,
payload: Rc<T>,
@ -94,37 +114,32 @@ impl<V: View> DragAndDrop<V> {
render: Rc<impl 'static + Fn(&T, &mut RenderContext<V>) -> ElementBox>,
) {
let window_id = cx.window_id();
cx.update_global::<Self, _, _>(|this, cx| {
cx.update_global(|this: &mut Self, cx| {
this.notify_containers_for_window(window_id, cx);
if matches!(this.currently_dragged, Some(State::Canceled)) {
return;
match this.currently_dragged.as_ref() {
Some(&State::Down {
region_offset,
region,
})
| Some(&State::Dragging {
region_offset,
region,
..
}) => {
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)
}),
});
}
_ => {}
}
let (region_offset, region) = if let Some(State::Dragging {
region_offset,
region,
..
}) = this.currently_dragged.as_ref()
{
(*region_offset, *region)
} else {
(
event.region.origin() - event.prev_mouse_position,
event.region,
)
};
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)
}),
});
});
}
@ -135,6 +150,7 @@ impl<V: View> DragAndDrop<V> {
.clone()
.and_then(|state| {
match state {
State::Down { .. } => None,
State::Dragging {
window_id,
region_offset,
@ -263,7 +279,11 @@ impl<Tag> Draggable for MouseEventHandler<Tag> {
{
let payload = Rc::new(payload);
let render = Rc::new(render);
self.on_drag(MouseButton::Left, move |e, cx| {
self.on_down(MouseButton::Left, move |e, cx| {
cx.propagate_event();
DragAndDrop::<V>::drag_started(e, cx);
})
.on_drag(MouseButton::Left, move |e, cx| {
let payload = payload.clone();
let render = render.clone();
DragAndDrop::<V>::dragging(e, payload, cx, render)