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Merge tab & char rendering code

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This commit is contained in:
Blaž Hrastnik 2021-06-27 23:16:17 +09:00
parent 01b1a62e2c
commit bcca152ad5
1 changed files with 19 additions and 36 deletions
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55
helix-term/src/ui/editor.rs
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@ -245,15 +245,10 @@ impl EditorView {
acc.patch(style)
});
// TODO: we could render the text to a surface, then cache that, that
// way if only the selection/cursor changes we can copy from cache
// and paint the new cursor.
// We could keep a single resizable surface on the View for that.
// iterate over range char by char
for grapheme in RopeGraphemes::new(text) {
let out_of_bounds = visual_x < view.first_col as u16
|| visual_x >= viewport.width + view.first_col as u16;
if LineEnding::from_rope_slice(&grapheme).is_some() {
if !out_of_bounds {
// we still want to render an empty cell with the style
@ -272,42 +267,30 @@ impl EditorView {
if line >= viewport.height {
break 'outer;
}
} else if grapheme == "\t" {
if out_of_bounds {
// if we're offscreen just keep going until we hit a new line
visual_x = visual_x.saturating_add(tab_width as u16);
continue;
}
// we still want to render an empty cell with the style
surface.set_string(
viewport.x + visual_x - view.first_col as u16,
viewport.y + line,
&tab,
style,
);
visual_x = visual_x.saturating_add(tab_width as u16);
} else {
// Cow will prevent allocations if span contained in a single slice
// which should really be the majority case
let grapheme = Cow::from(grapheme);
let width = grapheme_width(&grapheme) as u16;
if out_of_bounds {
let (grapheme, width) = if grapheme == "\t" {
// make sure we display tab as appropriate amount of spaces
(tab.as_str(), tab_width)
} else {
// Cow will prevent allocations if span contained in a single slice
// which should really be the majority case
let width = grapheme_width(&grapheme);
(grapheme.as_ref(), width)
};
if !out_of_bounds {
// if we're offscreen just keep going until we hit a new line
visual_x = visual_x.saturating_add(width);
continue;
surface.set_string(
viewport.x + visual_x - view.first_col as u16,
viewport.y + line,
grapheme,
style,
);
}
surface.set_string(
viewport.x + visual_x - view.first_col as u16,
viewport.y + line,
grapheme,
style,
);
visual_x += width;
visual_x = visual_x.saturating_add(width as u16);
}
}
}