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Improve PaneGrid API by introducing DragEvent

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This commit is contained in:
Héctor Ramón Jiménez 2020-03-13 07:35:44 +01:00
parent 2d8d420949
commit c2ced4cd59
1 changed files with 43 additions and 33 deletions
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76
native/src/widget/pane_grid.rs
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@ -12,7 +12,7 @@ pub struct PaneGrid<'a, Message, Renderer> {
elements: Vec<(Pane, Element<'a, Message, Renderer>)>,
width: Length,
height: Length,
on_drop: Option<Box<dyn Fn(Drop) -> Message>>,
on_drag: Option<Box<dyn Fn(DragEvent) -> Message>>,
}
impl<'a, Message, Renderer> PaneGrid<'a, Message, Renderer> {
@ -49,7 +49,7 @@ impl<'a, Message, Renderer> PaneGrid<'a, Message, Renderer> {
elements,
width: Length::Fill,
height: Length::Fill,
on_drop: None,
on_drag: None,
}
}
@ -69,16 +69,20 @@ impl<'a, Message, Renderer> PaneGrid<'a, Message, Renderer> {
self
}
pub fn on_drop(mut self, f: impl Fn(Drop) -> Message + 'static) -> Self {
self.on_drop = Some(Box::new(f));
pub fn on_drag(
mut self,
f: impl Fn(DragEvent) -> Message + 'static,
) -> Self {
self.on_drag = Some(Box::new(f));
self
}
}
#[derive(Debug, Clone, Copy)]
pub struct Drop {
pub pane: Pane,
pub target: Pane,
pub enum DragEvent {
Picked { pane: Pane },
Dropped { pane: Pane, target: Pane },
Canceled { pane: Pane },
}
impl<'a, Message, Renderer> Widget<Message, Renderer>
@ -147,28 +151,38 @@ where
);
if let Some(((pane, _), _)) = clicked_region.next() {
self.state.focused_pane = if self.on_drop.is_some()
&& self.state.modifiers.alt
{
FocusedPane::Some {
pane: *pane,
focus: Focus::Dragging,
match &self.on_drag {
Some(on_drag) if self.state.modifiers.alt => {
self.state.focused_pane = FocusedPane::Some {
pane: *pane,
focus: Focus::Dragging,
};
messages.push(on_drag(DragEvent::Picked {
pane: *pane,
}));
}
} else {
FocusedPane::Some {
pane: *pane,
focus: Focus::Idle,
_ => {
self.state.focused_pane = FocusedPane::Some {
pane: *pane,
focus: Focus::Idle,
};
}
}
}
}
ButtonState::Released => {
if let Some(on_drop) = &self.on_drop {
if let FocusedPane::Some {
if let FocusedPane::Some {
pane,
focus: Focus::Dragging,
} = self.state.focused_pane
{
self.state.focused_pane = FocusedPane::Some {
pane,
focus: Focus::Dragging,
} = self.state.focused_pane
{
focus: Focus::Idle,
};
if let Some(on_drag) = &self.on_drag {
let mut dropped_region = self
.elements
.iter()
@ -177,21 +191,17 @@ where
layout.bounds().contains(cursor_position)
});
if let Some(((target, _), _)) =
dropped_region.next()
{
if pane != *target {
messages.push(on_drop(Drop {
let event = match dropped_region.next() {
Some(((target, _), _)) if pane != *target => {
DragEvent::Dropped {
pane,
target: *target,
}));
}
}
}
self.state.focused_pane = FocusedPane::Some {
pane,
focus: Focus::Idle,
_ => DragEvent::Canceled { pane },
};
messages.push(on_drag(event));
}
}
}