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Make Widget::layout and operate mutable

Browse source 
... and bless `responsive`!
This commit is contained in:
Héctor Ramón Jiménez 2025-08-20 22:42:15 +02:00
parent 9490d735c5
commit 31bc6d48cd
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GPG key ID: 7CC46565708259A7
54 changed files with 284 additions and 519 deletions
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10
core/src/element.rs
View file

@ -291,7 +291,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -300,7 +300,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -426,7 +426,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -435,7 +435,7 @@ where
}
fn operate(
&self,
&mut self,
state: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -554,7 +554,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
_limits: &layout::Limits,

21
core/src/layout/flex.rs
View file

@ -68,7 +68,7 @@ pub fn resolve<Message, Theme, Renderer>(
padding: Padding,
spacing: f32,
align_items: Alignment,
items: &[Element<'_, Message, Theme, Renderer>],
items: &mut [Element<'_, Message, Theme, Renderer>],
trees: &mut [widget::Tree],
) -> Node
where
@ -95,7 +95,8 @@ where
// We lay out non-fluid elements in the main axis.
// If we need to compress the cross axis, then we skip any of these elements
// that are also fluid in the cross axis.
for (i, (child, tree)) in items.iter().zip(trees.iter_mut()).enumerate() {
for (i, (child, tree)) in items.iter_mut().zip(trees.iter_mut()).enumerate()
{
let (fill_main_factor, fill_cross_factor) = {
let size = child.as_widget().size();
@ -117,7 +118,7 @@ where
Limits::new(Size::ZERO, Size::new(max_width, max_height));
let layout =
child.as_widget().layout(tree, renderer, &child_limits);
child.as_widget_mut().layout(tree, renderer, &child_limits);
let size = layout.size();
available -= axis.main(size);
@ -141,7 +142,8 @@ where
// We can defer the layout of any elements that have a fixed size in the main axis,
// allowing them to use the cross calculations of the next pass.
if cross_compress && some_fill_cross {
for (i, (child, tree)) in items.iter().zip(trees.iter_mut()).enumerate()
for (i, (child, tree)) in
items.iter_mut().zip(trees.iter_mut()).enumerate()
{
let (main_size, cross_size) = {
let size = child.as_widget().size();
@ -161,7 +163,7 @@ where
Limits::new(Size::ZERO, Size::new(max_width, max_height));
let layout =
child.as_widget().layout(tree, renderer, &child_limits);
child.as_widget_mut().layout(tree, renderer, &child_limits);
let size = layout.size();
available -= axis.main(size);
@ -186,7 +188,8 @@ where
// THIRD PASS
// We lay out the elements that are fluid in the main axis.
// We use the remaining space to evenly allocate space based on fill factors.
for (i, (child, tree)) in items.iter().zip(trees.iter_mut()).enumerate() {
for (i, (child, tree)) in items.iter_mut().zip(trees.iter_mut()).enumerate()
{
let (fill_main_factor, fill_cross_factor) = {
let size = child.as_widget().size();
@ -225,7 +228,7 @@ where
);
let layout =
child.as_widget().layout(tree, renderer, &child_limits);
child.as_widget_mut().layout(tree, renderer, &child_limits);
cross = cross.max(axis.cross(layout.size()));
nodes[i] = layout;
@ -237,7 +240,7 @@ where
// These are elements that must be compressed in their cross axis and have
// a fixed length in the main axis.
if cross_compress && some_fill_cross {
for (i, (child, tree)) in items.iter().zip(trees).enumerate() {
for (i, (child, tree)) in items.iter_mut().zip(trees).enumerate() {
let (main_size, cross_size) = {
let size = child.as_widget().size();
@ -255,7 +258,7 @@ where
Limits::new(Size::ZERO, Size::new(max_width, max_height));
let layout =
child.as_widget().layout(tree, renderer, &child_limits);
child.as_widget_mut().layout(tree, renderer, &child_limits);
let size = layout.size();
cross = cross.max(axis.cross(size));

4
core/src/widget.rs
View file

@ -58,7 +58,7 @@ where
/// This [`layout::Node`] is used by the runtime to compute the [`Layout`] of the
/// user interface.
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -102,7 +102,7 @@ where
/// Applies an [`Operation`] to the [`Widget`].
fn operate(
&self,
&mut self,
_state: &mut Tree,
_layout: Layout<'_>,
_renderer: &Renderer,

4
core/src/widget/text.rs
View file

@ -207,7 +207,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -245,7 +245,7 @@ where
}
fn operate(
&self,
&mut self,
_state: &mut Tree,
layout: Layout<'_>,
_renderer: &Renderer,

2
examples/custom_quad/src/main.rs
View file

@ -175,7 +175,7 @@ mod quad {
}
fn layout(
&self,
&mut self,
_tree: &mut widget::Tree,
_renderer: &Renderer,
_limits: &layout::Limits,

2
examples/custom_widget/src/main.rs
View file

@ -33,7 +33,7 @@ mod circle {
}
fn layout(
&self,
&mut self,
_tree: &mut widget::Tree,
_renderer: &Renderer,
_limits: &layout::Limits,

2
examples/geometry/src/main.rs
View file

@ -27,7 +27,7 @@ mod rainbow {
}
fn layout(
&self,
&mut self,
_tree: &mut widget::Tree,
_renderer: &Renderer,
limits: &layout::Limits,

2
examples/loading_spinners/src/circular.rs
View file

@ -253,7 +253,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

2
examples/loading_spinners/src/linear.rs
View file

@ -167,7 +167,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

4
examples/loupe/src/main.rs
View file

@ -96,12 +96,12 @@ mod loupe {
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content.as_widget().layout(tree, renderer, limits)
self.content.as_widget_mut().layout(tree, renderer, limits)
}
fn draw(

12
examples/toast/src/main.rs
View file

@ -287,12 +287,12 @@ mod toast {
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content.as_widget().layout(
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
@ -343,14 +343,14 @@ mod toast {
}
fn operate(
&self,
&mut self,
state: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation,
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut state.children[0],
layout,
renderer,
@ -582,12 +582,12 @@ mod toast {
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.toasts
.iter()
.iter_mut()
.zip(self.state.iter_mut())
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});

10
runtime/src/user_interface.rs
View file

@ -97,12 +97,12 @@ where
cache: Cache,
renderer: &mut Renderer,
) -> Self {
let root = root.into();
let mut root = root.into();
let Cache { mut state } = cache;
state.diff(root.as_widget());
let base = root.as_widget().layout(
let base = root.as_widget_mut().layout(
&mut state,
renderer,
&layout::Limits::new(Size::ZERO, bounds),
@ -234,7 +234,7 @@ where
if shell.is_layout_invalid() {
drop(maybe_overlay);
self.base = self.root.as_widget().layout(
self.base = self.root.as_widget_mut().layout(
&mut self.state,
renderer,
&layout::Limits::new(Size::ZERO, self.bounds),
@ -335,7 +335,7 @@ where
input_method.merge(shell.input_method());
shell.revalidate_layout(|| {
self.base = self.root.as_widget().layout(
self.base = self.root.as_widget_mut().layout(
&mut self.state,
renderer,
&layout::Limits::new(Size::ZERO, self.bounds),
@ -539,7 +539,7 @@ where
) {
let viewport = Rectangle::with_size(self.bounds);
self.root.as_widget().operate(
self.root.as_widget_mut().operate(
&mut self.state,
Layout::new(&self.base),
renderer,

8
widget/src/button.rs
View file

@ -235,7 +235,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -246,7 +246,7 @@ where
self.height,
self.padding,
|limits| {
self.content.as_widget().layout(
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
@ -256,14 +256,14 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation,
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout.children().next().unwrap(),
renderer,

2
widget/src/canvas.rs
View file

@ -207,7 +207,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

4
widget/src/checkbox.rs
View file

@ -269,7 +269,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -447,7 +447,7 @@ where
}
fn operate(
&self,
&mut self,
_state: &mut Tree,
layout: Layout<'_>,
_renderer: &Renderer,

10
widget/src/column.rs
View file

@ -206,7 +206,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -222,13 +222,13 @@ where
self.padding,
self.spacing,
self.align,
&self.children,
&mut self.children,
&mut tree.children,
)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -236,12 +236,12 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.children
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});

2
widget/src/combo_box.rs
View file

@ -471,7 +471,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,

10
widget/src/container.rs
View file

@ -259,7 +259,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -273,12 +273,14 @@ where
self.padding,
self.horizontal_alignment,
self.vertical_alignment,
|limits| self.content.as_widget().layout(tree, renderer, limits),
|limits| {
self.content.as_widget_mut().layout(tree, renderer, limits)
},
)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -288,7 +290,7 @@ where
self.id.as_ref().map(|id| &id.0),
layout.bounds(),
&mut |operation| {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
tree,
layout.children().next().unwrap(),
renderer,

8
widget/src/float.rs
View file

@ -116,12 +116,12 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content.as_widget().layout(tree, renderer, limits)
self.content.as_widget_mut().layout(tree, renderer, limits)
}
fn update(
@ -197,14 +197,14 @@ where
}
fn operate(
&self,
&mut self,
state: &mut widget::Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
self.content
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
}

12
widget/src/grid.rs
View file

@ -176,7 +176,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -220,10 +220,10 @@ where
let mut row_height = 0.0f32;
for (i, (child, tree)) in
self.children.iter().zip(&mut tree.children).enumerate()
self.children.iter_mut().zip(&mut tree.children).enumerate()
{
let node = child
.as_widget()
.as_widget_mut()
.layout(tree, renderer, &cell_limits)
.move_to((x, y));
@ -251,7 +251,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -259,12 +259,12 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.children
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});

22
widget/src/helpers.rs
View file

@ -609,12 +609,12 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content.as_widget().layout(tree, renderer, limits)
self.content.as_widget_mut().layout(tree, renderer, limits)
}
fn draw(
@ -633,14 +633,14 @@ where
}
fn operate(
&self,
&mut self,
state: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn operation::Operation,
) {
self.content
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
}
@ -772,18 +772,18 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let base = self.base.as_widget().layout(
let base = self.base.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
);
let top = self.top.as_widget().layout(
let top = self.top.as_widget_mut().layout(
&mut tree.children[1],
renderer,
&layout::Limits::new(Size::ZERO, base.size()),
@ -834,18 +834,20 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn operation::Operation,
) {
let children = [&self.base, &self.top]
let children = [&mut self.base, &mut self.top]
.into_iter()
.zip(layout.children().zip(&mut tree.children));
for (child, (layout, tree)) in children {
child.as_widget().operate(tree, layout, renderer, operation);
child
.as_widget_mut()
.operate(tree, layout, renderer, operation);
}
}

2
widget/src/image.rs
View file

@ -386,7 +386,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

2
widget/src/image/viewer.rs
View file

@ -117,7 +117,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

10
widget/src/keyed/column.rs
View file

@ -253,7 +253,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -272,13 +272,13 @@ where
self.padding,
self.spacing,
self.align_items,
&self.children,
&mut self.children,
&mut tree.children,
)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -286,12 +286,12 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.children
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});

18
widget/src/lazy.rs
View file

@ -166,27 +166,29 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.with_element(|element| {
element
.as_widget()
.layout(&mut tree.children[0], renderer, limits)
self.with_element_mut(|element| {
element.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
)
})
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
self.with_element(|element| {
element.as_widget().operate(
self.with_element_mut(|element| {
element.as_widget_mut().operate(
&mut tree.children[0],
layout,
renderer,

12
widget/src/lazy/component.rs
View file

@ -299,15 +299,15 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let t = tree.state.downcast_mut::<Rc<RefCell<Option<Tree>>>>();
self.with_element(|element| {
element.as_widget().layout(
self.with_element_mut(|element| {
element.as_widget_mut().layout(
&mut t.borrow_mut().as_mut().unwrap().children[0],
renderer,
limits,
@ -378,7 +378,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -387,8 +387,8 @@ where
self.rebuild_element_with_operation(layout, operation);
let tree = tree.state.downcast_mut::<Rc<RefCell<Option<Tree>>>>();
self.with_element(|element| {
element.as_widget().operate(
self.with_element_mut(|element| {
element.as_widget_mut().operate(
&mut tree.borrow_mut().as_mut().unwrap().children[0],
layout,
renderer,

384
widget/src/lazy/responsive.rs
View file

@ -5,16 +5,10 @@ use crate::core::renderer;
use crate::core::widget;
use crate::core::widget::tree::{self, Tree};
use crate::core::{
self, Clipboard, Element, Event, Length, Point, Rectangle, Shell, Size,
Vector, Widget,
self, Clipboard, Element, Event, Length, Rectangle, Shell, Size, Vector,
Widget,
};
use crate::horizontal_space;
use crate::runtime::overlay::Nested;
use ouroboros::self_referencing;
use std::cell::{RefCell, RefMut};
use std::marker::PhantomData;
use std::ops::Deref;
/// A widget that is aware of its dimensions.
///
@ -29,7 +23,7 @@ pub struct Responsive<
Renderer = crate::Renderer,
> {
view: Box<dyn Fn(Size) -> Element<'a, Message, Theme, Renderer> + 'a>,
content: RefCell<Content<'a, Message, Theme, Renderer>>,
content: Element<'a, Message, Theme, Renderer>,
}
impl<'a, Message, Theme, Renderer> Responsive<'a, Message, Theme, Renderer>
@ -47,91 +41,13 @@ where
) -> Self {
Self {
view: Box::new(view),
content: RefCell::new(Content {
size: Size::ZERO,
layout: None,
is_layout_invalid: true,
element: Element::new(horizontal_space().width(0)),
}),
content: Element::new(horizontal_space().width(0)),
}
}
}
struct Content<'a, Message, Theme, Renderer> {
size: Size,
layout: Option<layout::Node>,
is_layout_invalid: bool,
element: Element<'a, Message, Theme, Renderer>,
}
impl<'a, Message, Theme, Renderer> Content<'a, Message, Theme, Renderer>
where
Renderer: core::Renderer,
{
fn layout(&mut self, tree: &mut Tree, renderer: &Renderer) {
if self.layout.is_none() || self.is_layout_invalid {
self.layout = Some(self.element.as_widget().layout(
tree,
renderer,
&layout::Limits::new(Size::ZERO, self.size),
));
self.is_layout_invalid = false;
}
}
fn update(
&mut self,
tree: &mut Tree,
new_size: Size,
view: &dyn Fn(Size) -> Element<'a, Message, Theme, Renderer>,
) {
if self.size != new_size {
self.element = view(new_size);
self.size = new_size;
self.layout = None;
tree.diff(&self.element);
} else {
let is_tree_empty =
tree.tag == tree::Tag::stateless() && tree.children.is_empty();
if is_tree_empty {
self.layout = None;
tree.diff(&self.element);
}
}
}
fn resolve<R, T>(
&mut self,
tree: &mut Tree,
renderer: R,
layout: Layout<'_>,
view: &dyn Fn(Size) -> Element<'a, Message, Theme, Renderer>,
f: impl FnOnce(
&mut Tree,
R,
Layout<'_>,
&mut Element<'a, Message, Theme, Renderer>,
) -> T,
) -> T
where
R: Deref<Target = Renderer>,
{
self.update(tree, layout.bounds().size(), view);
self.layout(tree, renderer.deref());
let content_layout = Layout::with_offset(
layout.position() - Point::ORIGIN,
self.layout.as_ref().unwrap(),
);
f(tree, renderer, content_layout, &mut self.element)
}
}
struct State {
tree: RefCell<Tree>,
tree: Tree,
}
impl<Message, Theme, Renderer> Widget<Message, Theme, Renderer>
@ -145,7 +61,7 @@ where
fn state(&self) -> tree::State {
tree::State::new(State {
tree: RefCell::new(Tree::empty()),
tree: Tree::empty(),
})
}
@ -157,35 +73,22 @@ where
}
fn layout(
&self,
_tree: &mut Tree,
_renderer: &Renderer,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
layout::Node::new(limits.max())
}
fn operate(
&self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
let state = tree.state.downcast_mut::<State>();
let mut content = self.content.borrow_mut();
let size = limits.max();
content.resolve(
&mut state.tree.borrow_mut(),
self.content = (self.view)(size);
state.tree.diff(&self.content);
self.content.as_widget_mut().layout(
&mut state.tree,
renderer,
layout,
&self.view,
|tree, renderer, layout, element| {
element
.as_widget()
.operate(tree, layout, renderer, operation);
},
);
&limits.loose(),
)
}
fn update(
@ -200,35 +103,17 @@ where
viewport: &Rectangle,
) {
let state = tree.state.downcast_mut::<State>();
let mut content = self.content.borrow_mut();
let mut local_messages = vec![];
let mut local_shell = Shell::new(&mut local_messages);
content.resolve(
&mut state.tree.borrow_mut(),
renderer,
self.content.as_widget_mut().update(
&mut state.tree,
event,
layout,
&self.view,
|tree, renderer, layout, element| {
element.as_widget_mut().update(
tree,
event,
layout,
cursor,
renderer,
clipboard,
&mut local_shell,
viewport,
);
},
cursor,
renderer,
clipboard,
shell,
viewport,
);
if local_shell.is_layout_invalid() {
content.layout = None;
}
shell.merge(local_shell, std::convert::identity);
}
fn draw(
@ -242,18 +127,15 @@ where
viewport: &Rectangle,
) {
let state = tree.state.downcast_ref::<State>();
let mut content = self.content.borrow_mut();
content.resolve(
&mut state.tree.borrow_mut(),
self.content.as_widget().draw(
&state.tree,
renderer,
theme,
style,
layout,
&self.view,
|tree, renderer, layout, element| {
element.as_widget().draw(
tree, renderer, theme, style, layout, cursor, viewport,
);
},
cursor,
viewport,
);
}
@ -266,79 +148,50 @@ where
renderer: &Renderer,
) -> mouse::Interaction {
let state = tree.state.downcast_ref::<State>();
let mut content = self.content.borrow_mut();
content.resolve(
&mut state.tree.borrow_mut(),
renderer,
self.content.as_widget().mouse_interaction(
&state.tree,
layout,
&self.view,
|tree, renderer, layout, element| {
element
.as_widget()
.mouse_interaction(tree, layout, cursor, viewport, renderer)
},
cursor,
viewport,
renderer,
)
}
fn overlay<'b>(
&'b mut self,
tree: &'b mut Tree,
layout: Layout<'b>,
fn operate(
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
let state = tree.state.downcast_mut::<State>();
self.content.as_widget_mut().operate(
&mut state.tree,
layout,
renderer,
operation,
);
}
fn overlay<'a>(
&'a mut self,
tree: &'a mut Tree,
layout: Layout<'a>,
renderer: &Renderer,
viewport: &Rectangle,
translation: Vector,
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
use std::ops::DerefMut;
) -> Option<overlay::Element<'a, Message, Theme, Renderer>> {
let state = tree.state.downcast_mut::<State>();
let state = tree.state.downcast_ref::<State>();
let overlay = OverlayBuilder {
content: self.content.borrow_mut(),
tree: state.tree.borrow_mut(),
types: PhantomData,
overlay_builder: |content: &mut RefMut<
'_,
Content<'_, _, _, _>,
>,
tree| {
content.update(tree, layout.bounds().size(), &self.view);
content.layout(tree, renderer);
let Content {
element,
layout: content_layout_node,
is_layout_invalid,
..
} = content.deref_mut();
let content_layout = Layout::with_offset(
layout.bounds().position() - Point::ORIGIN,
content_layout_node.as_ref().unwrap(),
);
(
element
.as_widget_mut()
.overlay(
tree,
content_layout,
renderer,
viewport,
translation,
)
.map(|overlay| RefCell::new(Nested::new(overlay))),
is_layout_invalid,
)
},
}
.build();
if overlay.with_overlay(|(overlay, _layout)| overlay.is_some()) {
Some(overlay::Element::new(Box::new(overlay)))
} else {
None
}
self.content.as_widget_mut().overlay(
&mut state.tree,
layout,
renderer,
viewport,
translation,
)
}
}
@ -354,108 +207,3 @@ where
Self::new(responsive)
}
}
#[self_referencing]
struct Overlay<'a, 'b, Message, Theme, Renderer> {
content: RefMut<'a, Content<'b, Message, Theme, Renderer>>,
tree: RefMut<'a, Tree>,
types: PhantomData<Message>,
#[borrows(mut content, mut tree)]
#[not_covariant]
overlay: (
Option<RefCell<Nested<'this, Message, Theme, Renderer>>>,
&'this mut bool,
),
}
impl<Message, Theme, Renderer> Overlay<'_, '_, Message, Theme, Renderer> {
fn with_overlay_maybe<T>(
&self,
f: impl FnOnce(&mut Nested<'_, Message, Theme, Renderer>) -> T,
) -> Option<T> {
self.with_overlay(|(overlay, _layout)| {
overlay.as_ref().map(|nested| (f)(&mut nested.borrow_mut()))
})
}
fn with_overlay_mut_maybe<T>(
&mut self,
f: impl FnOnce(&mut Nested<'_, Message, Theme, Renderer>) -> T,
) -> Option<T> {
self.with_overlay_mut(|(overlay, _layout)| {
overlay.as_mut().map(|nested| (f)(nested.get_mut()))
})
}
}
impl<Message, Theme, Renderer> overlay::Overlay<Message, Theme, Renderer>
for Overlay<'_, '_, Message, Theme, Renderer>
where
Renderer: core::Renderer,
{
fn layout(&mut self, renderer: &Renderer, bounds: Size) -> layout::Node {
self.with_overlay_maybe(|overlay| overlay.layout(renderer, bounds))
.unwrap_or_default()
}
fn draw(
&self,
renderer: &mut Renderer,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
) {
let _ = self.with_overlay_maybe(|overlay| {
overlay.draw(renderer, theme, style, layout, cursor);
});
}
fn mouse_interaction(
&self,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &Renderer,
) -> mouse::Interaction {
self.with_overlay_maybe(|overlay| {
overlay.mouse_interaction(layout, cursor, renderer)
})
.unwrap_or_default()
}
fn update(
&mut self,
event: &Event,
layout: Layout<'_>,
cursor: mouse::Cursor,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
) {
let mut is_layout_invalid = false;
let _ = self.with_overlay_mut_maybe(|overlay| {
overlay.update(event, layout, cursor, renderer, clipboard, shell);
is_layout_invalid = shell.is_layout_invalid();
});
if is_layout_invalid {
self.with_overlay_mut(|(_overlay, layout)| {
**layout = true;
});
}
}
fn operate(
&mut self,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
let _ = self.with_overlay_mut_maybe(|overlay| {
overlay.operate(layout, renderer, operation);
});
}
}

14
widget/src/mouse_area.rs
View file

@ -190,24 +190,26 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content
.as_widget()
.layout(&mut tree.children[0], renderer, limits)
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation,
) {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout,
renderer,

2
widget/src/overlay/menu.rs
View file

@ -369,7 +369,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

20
widget/src/pane_grid.rs
View file

@ -418,7 +418,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -432,20 +432,19 @@ where
let children = self
.panes
.iter()
.copied()
.zip(&self.contents)
.iter_mut()
.zip(&mut self.contents)
.zip(tree.children.iter_mut())
.filter_map(|((pane, content), tree)| {
if self
.internal
.maximized()
.is_some_and(|maximized| maximized != pane)
.is_some_and(|maximized| maximized != *pane)
{
return Some(layout::Node::new(Size::ZERO));
}
let region = regions.get(&pane)?;
let region = regions.get(pane)?;
let size = Size::new(region.width, region.height);
let node = content.layout(
@ -462,7 +461,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -470,15 +469,14 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.panes
.iter()
.copied()
.zip(&self.contents)
.iter_mut()
.zip(&mut self.contents)
.zip(&mut tree.children)
.zip(layout.children())
.filter(|(((pane, _), _), _)| {
self.internal
.maximized()
.is_none_or(|maximized| *pane == maximized)
.is_none_or(|maximized| **pane == maximized)
})
.for_each(|(((_, content), state), layout)| {
content.operate(state, layout, renderer, operation);

14
widget/src/pane_grid/content.rs
View file

@ -165,12 +165,12 @@ where
}
pub(crate) fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
if let Some(title_bar) = &self.title_bar {
if let Some(title_bar) = &mut self.title_bar {
let max_size = limits.max();
let title_bar_layout = title_bar.layout(
@ -181,7 +181,7 @@ where
let title_bar_size = title_bar_layout.size();
let body_layout = self.body.as_widget().layout(
let body_layout = self.body.as_widget_mut().layout(
&mut tree.children[0],
renderer,
&layout::Limits::new(
@ -201,7 +201,7 @@ where
],
)
} else {
self.body.as_widget().layout(
self.body.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
@ -210,13 +210,13 @@ where
}
pub(crate) fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
let body_layout = if let Some(title_bar) = &self.title_bar {
let body_layout = if let Some(title_bar) = &mut self.title_bar {
let mut children = layout.children();
title_bar.operate(
@ -231,7 +231,7 @@ where
layout
};
self.body.as_widget().operate(
self.body.as_widget_mut().operate(
&mut tree.children[0],
body_layout,
renderer,

26
widget/src/pane_grid/title_bar.rs
View file

@ -274,7 +274,7 @@ where
}
pub(crate) fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -282,7 +282,7 @@ where
let limits = limits.shrink(self.padding);
let max_size = limits.max();
let title_layout = self.content.as_widget().layout(
let title_layout = self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
&layout::Limits::new(Size::ZERO, max_size),
@ -290,8 +290,8 @@ where
let title_size = title_layout.size();
let node = if let Some(controls) = &self.controls {
let controls_layout = controls.full.as_widget().layout(
let node = if let Some(controls) = &mut self.controls {
let controls_layout = controls.full.as_widget_mut().layout(
&mut tree.children[1],
renderer,
&layout::Limits::new(Size::ZERO, max_size),
@ -300,8 +300,8 @@ where
if title_layout.bounds().width + controls_layout.bounds().width
> max_size.width
{
if let Some(compact) = controls.compact.as_ref() {
let compact_layout = compact.as_widget().layout(
if let Some(compact) = controls.compact.as_mut() {
let compact_layout = compact.as_widget_mut().layout(
&mut tree.children[2],
renderer,
&layout::Limits::new(Size::ZERO, max_size),
@ -369,7 +369,7 @@ where
}
pub(crate) fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -382,16 +382,16 @@ where
let title_layout = children.next().unwrap();
let mut show_title = true;
if let Some(controls) = &self.controls {
if let Some(controls) = &mut self.controls {
let controls_layout = children.next().unwrap();
if title_layout.bounds().width + controls_layout.bounds().width
> padded.bounds().width
{
if let Some(compact) = controls.compact.as_ref() {
if let Some(compact) = controls.compact.as_mut() {
let compact_layout = children.next().unwrap();
compact.as_widget().operate(
compact.as_widget_mut().operate(
&mut tree.children[2],
compact_layout,
renderer,
@ -400,7 +400,7 @@ where
} else {
show_title = false;
controls.full.as_widget().operate(
controls.full.as_widget_mut().operate(
&mut tree.children[1],
controls_layout,
renderer,
@ -408,7 +408,7 @@ where
);
}
} else {
controls.full.as_widget().operate(
controls.full.as_widget_mut().operate(
&mut tree.children[1],
controls_layout,
renderer,
@ -418,7 +418,7 @@ where
};
if show_title {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut tree.children[0],
title_layout,
renderer,

2
widget/src/pick_list.rs
View file

@ -348,7 +348,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

8
widget/src/pin.rs
View file

@ -139,7 +139,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -151,7 +151,7 @@ where
let node = self
.content
.as_widget()
.as_widget_mut()
.layout(tree, renderer, &layout::Limits::new(Size::ZERO, available))
.move_to(self.position);
@ -160,13 +160,13 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut widget::Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
tree,
layout.children().next().unwrap(),
renderer,

2
widget/src/progress_bar.rs
View file

@ -157,7 +157,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

2
widget/src/qr_code.rs
View file

@ -136,7 +136,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
_limits: &layout::Limits,

2
widget/src/radio.rs
View file

@ -290,7 +290,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

18
widget/src/row.rs
View file

@ -208,7 +208,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -222,13 +222,13 @@ where
self.padding,
self.spacing,
self.align,
&self.children,
&mut self.children,
&mut tree.children,
)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -236,12 +236,12 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.children
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});
@ -407,7 +407,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -449,8 +449,8 @@ where
}
};
for (i, child) in self.row.children.iter().enumerate() {
let node = child.as_widget().layout(
for (i, child) in self.row.children.iter_mut().enumerate() {
let node = child.as_widget_mut().layout(
&mut tree.children[i],
renderer,
&limits,
@ -528,7 +528,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,

2
widget/src/rule.rs
View file

@ -112,7 +112,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

8
widget/src/scrollable.rs
View file

@ -421,7 +421,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -453,7 +453,7 @@ where
),
);
self.content.as_widget().layout(
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
&child_limits,
@ -527,7 +527,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -553,7 +553,7 @@ where
self.id.as_ref().map(|id| &id.0),
bounds,
&mut |operation| {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout.children().next().unwrap(),
renderer,

14
widget/src/sensor.rs
View file

@ -287,14 +287,16 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content
.as_widget()
.layout(&mut tree.children[0], renderer, limits)
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
)
}
fn draw(
@ -319,13 +321,13 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: core::Layout<'_>,
renderer: &Renderer,
operation: &mut dyn widget::Operation,
) {
self.content.as_widget().operate(
self.content.as_widget_mut().operate(
&mut tree.children[0],
layout,
renderer,

2
widget/src/shader.rs
View file

@ -77,7 +77,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

2
widget/src/slider.rs
View file

@ -234,7 +234,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

2
widget/src/space.rs
View file

@ -65,7 +65,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,

23
widget/src/stack.rs
View file

@ -158,7 +158,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -173,7 +173,7 @@ where
));
}
let base = self.children[0].as_widget().layout(
let base = self.children[0].as_widget_mut().layout(
&mut tree.children[0],
renderer,
&limits,
@ -183,18 +183,21 @@ where
let limits = layout::Limits::new(Size::ZERO, size);
let nodes = std::iter::once(base)
.chain(self.children[1..].iter().zip(&mut tree.children[1..]).map(
|(layer, tree)| {
layer.as_widget().layout(tree, renderer, &limits)
},
))
.chain(
self.children[1..]
.iter_mut()
.zip(&mut tree.children[1..])
.map(|(layer, tree)| {
layer.as_widget_mut().layout(tree, renderer, &limits)
}),
)
.collect();
layout::Node::with_children(size, nodes)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -202,12 +205,12 @@ where
) {
operation.container(None, layout.bounds(), &mut |operation| {
self.children
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
.for_each(|((child, state), layout)| {
child
.as_widget()
.as_widget_mut()
.operate(state, layout, renderer, operation);
});
});

2
widget/src/svg.rs
View file

@ -162,7 +162,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

17
widget/src/table.rs
View file

@ -232,7 +232,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -265,7 +265,7 @@ where
let mut y = self.padding_y;
for (i, (cell, state)) in
self.cells.iter().zip(&mut tree.children).enumerate()
self.cells.iter_mut().zip(&mut tree.children).enumerate()
{
let row = i / columns;
let column = i % columns;
@ -306,7 +306,7 @@ where
)
.width(width);
let layout = cell.as_widget().layout(state, renderer, &limits);
let layout = cell.as_widget_mut().layout(state, renderer, &limits);
let size = limits.resolve(width, Length::Shrink, layout.size());
metrics.columns[column] = metrics.columns[column].max(size.width);
@ -344,7 +344,7 @@ where
let mut y = self.padding_y;
for (i, (cell, state)) in
self.cells.iter().zip(&mut tree.children).enumerate()
self.cells.iter_mut().zip(&mut tree.children).enumerate()
{
let row = i / columns;
let column = i % columns;
@ -396,7 +396,7 @@ where
)
.width(width);
let layout = cell.as_widget().layout(state, renderer, &limits);
let layout = cell.as_widget_mut().layout(state, renderer, &limits);
let size = limits.resolve(
if let Length::Fixed(_) = width {
width
@ -581,7 +581,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut widget::Tree,
layout: Layout<'_>,
renderer: &Renderer,
@ -589,11 +589,12 @@ where
) {
for ((cell, state), layout) in self
.cells
.iter()
.iter_mut()
.zip(&mut tree.children)
.zip(layout.children())
{
cell.as_widget().operate(state, layout, renderer, operation);
cell.as_widget_mut()
.operate(state, layout, renderer, operation);
}
}

2
widget/src/text/rich.rs
View file

@ -225,7 +225,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

4
widget/src/text_editor.rs
View file

@ -597,7 +597,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -1051,7 +1051,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut widget::Tree,
layout: Layout<'_>,
_renderer: &Renderer,

6
widget/src/text_input.rs
View file

@ -297,7 +297,7 @@ where
///
/// [`Renderer`]: text::Renderer
pub fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -671,7 +671,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
@ -680,7 +680,7 @@ where
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
_renderer: &Renderer,

8
widget/src/themer.rs
View file

@ -90,23 +90,23 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content.as_widget().layout(tree, renderer, limits)
self.content.as_widget_mut().layout(tree, renderer, limits)
}
fn operate(
&self,
&mut self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation,
) {
self.content
.as_widget()
.as_widget_mut()
.operate(tree, layout, renderer, operation);
}

2
widget/src/toggler.rs
View file

@ -270,7 +270,7 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,

16
widget/src/tooltip.rs
View file

@ -179,14 +179,16 @@ where
}
fn layout(
&self,
&mut self,
tree: &mut widget::Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.content
.as_widget()
.layout(&mut tree.children[0], renderer, limits)
self.content.as_widget_mut().layout(
&mut tree.children[0],
renderer,
limits,
)
}
fn update(
@ -294,7 +296,7 @@ where
let tooltip = if let State::Hovered { cursor_position } = *state {
Some(overlay::Element::new(Box::new(Overlay {
position: layout.position() + translation,
tooltip: &self.tooltip,
tooltip: &mut self.tooltip,
state: children.next().unwrap(),
cursor_position,
content_bounds: layout.bounds(),
@ -366,7 +368,7 @@ where
Renderer: text::Renderer,
{
position: Point,
tooltip: &'b Element<'a, Message, Theme, Renderer>,
tooltip: &'b mut Element<'a, Message, Theme, Renderer>,
state: &'b mut widget::Tree,
cursor_position: Point,
content_bounds: Rectangle,
@ -386,7 +388,7 @@ where
fn layout(&mut self, renderer: &Renderer, bounds: Size) -> layout::Node {
let viewport = Rectangle::with_size(bounds);
let tooltip_layout = self.tooltip.as_widget().layout(
let tooltip_layout = self.tooltip.as_widget_mut().layout(
self.state,
renderer,
&layout::Limits::new(

2
widget/src/vertical_slider.rs
View file

@ -238,7 +238,7 @@ where
}
fn layout(
&self,
&mut self,
_tree: &mut Tree,
_renderer: &Renderer,
limits: &layout::Limits,