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better safe shared layout cache (#62)

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Conrad Ludgate 2023-03-12 12:53:30 +00:00 committed by GitHub
parent 0dc39434c2
commit 02573b0ad2
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 17 additions and 12 deletions
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24
src/layout.rs
View file

@ -1,6 +1,7 @@
use std::cell::RefCell;
use std::cmp::{max, min};
use std::collections::HashMap;
use std::rc::Rc;
use cassowary::strength::{MEDIUM, REQUIRED, WEAK};
use cassowary::WeightedRelation::*;
@ -68,8 +69,9 @@ pub struct Layout {
expand_to_fill: bool,
}
type Cache = HashMap<(Rect, Layout), Rc<[Rect]>>;
thread_local! {
static LAYOUT_CACHE: RefCell<HashMap<(Rect, Layout), Vec<Rect>>> = RefCell::new(HashMap::new());
static LAYOUT_CACHE: RefCell<Cache> = RefCell::new(HashMap::new());
}
impl Default for Layout {
@ -139,8 +141,8 @@ impl Layout {
/// height: 10,
/// });
/// assert_eq!(
/// chunks,
/// vec![
/// chunks[..],
/// [
/// Rect {
/// x: 2,
/// y: 2,
@ -166,8 +168,8 @@ impl Layout {
/// height: 2,
/// });
/// assert_eq!(
/// chunks,
/// vec![
/// chunks[..],
/// [
/// Rect {
/// x: 0,
/// y: 0,
@ -183,7 +185,7 @@ impl Layout {
/// ]
/// );
/// ```
pub fn split(&self, area: Rect) -> Vec<Rect> {
pub fn split(&self, area: Rect) -> Rc<[Rect]> {
// TODO: Maybe use a fixed size cache ?
LAYOUT_CACHE.with(|c| {
c.borrow_mut()
@ -194,7 +196,7 @@ impl Layout {
}
}
fn split(area: Rect, layout: &Layout) -> Vec<Rect> {
fn split(area: Rect, layout: &Layout) -> Rc<[Rect]> {
let mut solver = Solver::new();
let mut vars: HashMap<Variable, (usize, usize)> = HashMap::new();
let elements = layout
@ -202,11 +204,13 @@ fn split(area: Rect, layout: &Layout) -> Vec<Rect> {
.iter()
.map(|_| Element::new())
.collect::<Vec<Element>>();
let mut results = layout
let mut res = layout
.constraints
.iter()
.map(|_| Rect::default())
.collect::<Vec<Rect>>();
.collect::<Rc<[Rect]>>();
let mut results = Rc::get_mut(&mut res).expect("newly created Rc should have no shared refs");
let dest_area = area.inner(&layout.margin);
for (i, e) in elements.iter().enumerate() {
@ -343,7 +347,7 @@ fn split(area: Rect, layout: &Layout) -> Vec<Rect> {
}
}
}
results
res
}
/// A container used by the solver inside split

5
src/widgets/table.rs
View file

@ -280,7 +280,7 @@ impl<'a> Table<'a> {
if !self.widths.is_empty() {
constraints.pop();
}
let mut chunks = Layout::default()
let chunks = Layout::default()
.direction(Direction::Horizontal)
.constraints(constraints)
.expand_to_fill(false)
@ -290,8 +290,9 @@ impl<'a> Table<'a> {
width: max_width,
height: 1,
});
let mut chunks = &chunks[..];
if has_selection {
chunks.remove(0);
chunks = &chunks[1..];
}
chunks.iter().step_by(2).map(|c| c.width).collect()
}