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Implement basic layer merging for graphics::layer::Stack

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Héctor Ramón Jiménez 2025-08-16 23:15:20 +02:00
parent 95769fcd59
commit d3e9547079
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GPG key ID: 7CC46565708259A7
6 changed files with 122 additions and 17 deletions
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38
widget/src/stack.rs
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@ -23,6 +23,7 @@ pub struct Stack<'a, Message, Theme = crate::Theme, Renderer = crate::Renderer>
width: Length,
height: Length,
children: Vec<Element<'a, Message, Theme, Renderer>>,
clip: bool,
}
impl<'a, Message, Theme, Renderer> Stack<'a, Message, Theme, Renderer>
@ -62,6 +63,7 @@ where
width: Length::Shrink,
height: Length::Shrink,
children,
clip: false,
}
}
@ -114,6 +116,16 @@ where
) -> Self {
children.into_iter().fold(self, Self::push)
}
/// Sets whether the [`Stack`] should clip overflowing content.
///
/// It has a slight performance overhead during presentation.
///
/// By default, it is set to `false`.
pub fn clip(mut self, clip: bool) -> Self {
self.clip = clip;
self
}
}
impl<Message, Renderer> Default for Stack<'_, Message, Renderer>
@ -277,6 +289,12 @@ where
viewport: &Rectangle,
) {
if let Some(clipped_viewport) = layout.bounds().intersection(viewport) {
let viewport = if self.clip {
&clipped_viewport
} else {
viewport
};
let layers_below = if cursor.is_over(layout.bounds()) {
self.children
.iter()
@ -312,26 +330,16 @@ where
layout,
cursor| {
if i > 0 {
renderer.with_layer(clipped_viewport, |renderer| {
renderer.with_layer(*viewport, |renderer| {
layer.as_widget().draw(
state,
renderer,
theme,
style,
layout,
cursor,
&clipped_viewport,
state, renderer, theme, style, layout, cursor,
viewport,
);
});
} else {
layer.as_widget().draw(
state,
renderer,
theme,
style,
layout,
cursor,
&clipped_viewport,
state, renderer, theme, style, layout, cursor,
viewport,
);
}
};