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Start on caching views

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Co-Authored-By: Nathan Sobo <nathan@zed.dev>
This commit is contained in:
Antonio Scandurra 2024-01-08 19:07:20 +01:00
parent 5904bcf1c2
commit 84c36066bc
7 changed files with 117 additions and 58 deletions
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28
crates/gpui/src/taffy.rs
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@ -12,6 +12,7 @@ use taffy::{
pub struct TaffyLayoutEngine {
tree: TaffyTree,
styles: FxHashMap<LayoutId, Style>,
absolute_layout_bounds: FxHashMap<LayoutId, Bounds<Pixels>>,
computed_layouts: FxHashSet<LayoutId>,
nodes_to_measure: FxHashMap<
@ -32,6 +33,7 @@ impl TaffyLayoutEngine {
pub fn new() -> Self {
TaffyLayoutEngine {
tree: TaffyTree::new(),
styles: FxHashMap::default(),
absolute_layout_bounds: FxHashMap::default(),
computed_layouts: FxHashSet::default(),
nodes_to_measure: FxHashMap::default(),
@ -43,6 +45,11 @@ impl TaffyLayoutEngine {
self.absolute_layout_bounds.clear();
self.computed_layouts.clear();
self.nodes_to_measure.clear();
self.styles.clear();
}
pub fn requested_style(&self, layout_id: LayoutId) -> Option<&Style> {
self.styles.get(&layout_id)
}
pub fn request_layout(
@ -51,16 +58,21 @@ impl TaffyLayoutEngine {
rem_size: Pixels,
children: &[LayoutId],
) -> LayoutId {
let style = style.to_taffy(rem_size);
if children.is_empty() {
self.tree.new_leaf(style).expect(EXPECT_MESSAGE).into()
let taffy_style = style.to_taffy(rem_size);
let layout_id = if children.is_empty() {
self.tree
.new_leaf(taffy_style)
.expect(EXPECT_MESSAGE)
.into()
} else {
self.tree
// This is safe because LayoutId is repr(transparent) to taffy::tree::NodeId.
.new_with_children(style, unsafe { std::mem::transmute(children) })
.new_with_children(taffy_style, unsafe { std::mem::transmute(children) })
.expect(EXPECT_MESSAGE)
.into()
}
};
self.styles.insert(layout_id, style.clone());
layout_id
}
pub fn request_measured_layout(
@ -70,14 +82,16 @@ impl TaffyLayoutEngine {
measure: impl FnMut(Size<Option<Pixels>>, Size<AvailableSpace>, &mut WindowContext) -> Size<Pixels>
+ 'static,
) -> LayoutId {
let style = style.to_taffy(rem_size);
let style = style.clone();
let taffy_style = style.to_taffy(rem_size);
let layout_id = self
.tree
.new_leaf_with_context(style, ())
.new_leaf_with_context(taffy_style, ())
.expect(EXPECT_MESSAGE)
.into();
self.nodes_to_measure.insert(layout_id, Box::new(measure));
self.styles.insert(layout_id, style.clone());
layout_id
}