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Refactor of scroll and shaping

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- Scroll is identified by line index and layout index, instead of just
  layout index
- Shaping has the option to prune, where caches outside of the scroll
  view are cleared
- Syntax editor no longer requires layout of all lines, only of lines
  inside scroll
- BufferLine has a metadata field that can be used by other abstractions
  to know when text was changed
This commit is contained in:
Jeremy Soller 2023-12-15 13:37:59 -07:00
parent e7261fc06e
commit d0b4b4635e
16 changed files with 213 additions and 159 deletions
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42
src/edit/syntect.rs
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@ -206,14 +206,15 @@ impl<'a> Edit for SyntaxEditor<'a> {
self.editor.set_tab_width(tab_width);
}
fn shape_as_needed(&mut self, font_system: &mut FontSystem) {
fn shape_as_needed(&mut self, font_system: &mut FontSystem, prune: bool) {
#[cfg(feature = "std")]
let now = std::time::Instant::now();
let cursor = self.cursor();
let buffer = self.editor.buffer_mut();
let lines = buffer.visible_lines();
let scroll_end = buffer.scroll() + lines;
let visible_lines = buffer.visible_lines();
let scroll = buffer.scroll();
let scroll_end = scroll.layout + visible_lines;
let mut total_layout = 0;
let mut highlighted = 0;
for line_i in 0..buffer.lines.len() {
@ -223,15 +224,17 @@ impl<'a> Edit for SyntaxEditor<'a> {
}
let line = &mut buffer.lines[line_i];
if !line.is_reset() && line_i < self.syntax_cache.len() {
if line.metadata().is_some() && line_i < self.syntax_cache.len() {
//TODO: duplicated code!
// Perform shaping and layout of this line in order to count if we have reached scroll
match buffer.line_layout(font_system, line_i) {
Some(layout_lines) => {
total_layout += layout_lines.len() as i32;
}
None => {
//TODO: should this be possible?
if line_i >= scroll.line && total_layout < scroll_end {
// Perform shaping and layout of this line in order to count if we have reached scroll
match buffer.line_layout(font_system, line_i) {
Some(layout_lines) => {
total_layout += layout_lines.len() as i32;
}
None => {
//TODO: should this be possible?
}
}
}
continue;
@ -285,12 +288,14 @@ impl<'a> Edit for SyntaxEditor<'a> {
line.set_attrs_list(attrs_list);
// Perform shaping and layout of this line in order to count if we have reached scroll
match buffer.line_layout(font_system, line_i) {
Some(layout_lines) => {
total_layout += layout_lines.len() as i32;
}
None => {
//TODO: should this be possible?
if line_i >= scroll.line && total_layout < scroll_end {
match buffer.line_layout(font_system, line_i) {
Some(layout_lines) => {
total_layout += layout_lines.len() as i32;
}
None => {
//TODO: should this be possible?
}
}
}
@ -303,6 +308,7 @@ impl<'a> Edit for SyntaxEditor<'a> {
}
}
} else {
buffer.lines[line_i].set_metadata(self.syntax_cache.len());
self.syntax_cache.push(cache_item);
}
}
@ -317,7 +323,7 @@ impl<'a> Edit for SyntaxEditor<'a> {
);
}
self.editor.shape_as_needed(font_system);
self.editor.shape_as_needed(font_system, prune);
}
fn delete_range(&mut self, start: Cursor, end: Cursor) {