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Use nested for lazy widgets

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Cory Forsstrom 2023-02-19 17:43:13 -08:00 • committed by Héctor Ramón Jiménez
parent 4de6ee6fa1
commit b0205e03d8
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GPG key ID: 140CC052C94F138E
7 changed files with 77 additions and 49 deletions
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27
widget/src/lazy/responsive.rs
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@ -9,6 +9,7 @@ use crate::core::{
self, Clipboard, Element, Length, Point, Rectangle, Shell, Size, Widget,
};
use crate::horizontal_space;
use crate::runtime::overlay::Nested;
use ouroboros::self_referencing;
use std::cell::{RefCell, RefMut};
@ -298,13 +299,13 @@ where
element
.as_widget_mut()
.overlay(tree, content_layout, renderer)
.map(|overlay| RefCell::new(Nested::new(overlay)))
},
}
.build();
let has_overlay = overlay.with_overlay(|overlay| {
overlay.as_ref().map(overlay::Element::position)
});
let has_overlay =
overlay.with_overlay_maybe(|overlay| overlay.position());
has_overlay
.map(|position| overlay::Element::new(position, Box::new(overlay)))
@ -329,23 +330,27 @@ struct Overlay<'a, 'b, Message, Renderer> {
types: PhantomData<Message>,
#[borrows(mut content, mut tree)]
#[covariant]
overlay: Option<overlay::Element<'this, Message, Renderer>>,
#[not_covariant]
overlay: Option<RefCell<Nested<'this, Message, Renderer>>>,
}
impl<'a, 'b, Message, Renderer> Overlay<'a, 'b, Message, Renderer> {
fn with_overlay_maybe<T>(
&self,
f: impl FnOnce(&overlay::Element<'_, Message, Renderer>) -> T,
f: impl FnOnce(&mut Nested<'_, Message, Renderer>) -> T,
) -> Option<T> {
self.borrow_overlay().as_ref().map(f)
self.with_overlay(|overlay| {
overlay.as_ref().map(|nested| (f)(&mut nested.borrow_mut()))
})
}
fn with_overlay_mut_maybe<T>(
&mut self,
f: impl FnOnce(&mut overlay::Element<'_, Message, Renderer>) -> T,
f: impl FnOnce(&mut Nested<'_, Message, Renderer>) -> T,
) -> Option<T> {
self.with_overlay_mut(|overlay| overlay.as_mut().map(f))
self.with_overlay_mut(|overlay| {
overlay.as_mut().map(|nested| (f)(nested.get_mut()))
})
}
}
@ -361,9 +366,7 @@ where
position: Point,
) -> layout::Node {
self.with_overlay_maybe(|overlay| {
let translation = position - overlay.position();
overlay.layout(renderer, bounds, translation)
overlay.layout(renderer, bounds, position)
})
.unwrap_or_default()
}