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Use layout_runs for hit detection

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This commit is contained in:
Jeremy Soller 2022-10-25 13:13:13 -06:00
parent b6bd72335c
commit 0336e0c5e9
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 69 additions and 82 deletions
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151
src/buffer.rs
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@ -762,103 +762,90 @@ impl<'a> TextBuffer<'a> {
let font_size = self.metrics.font_size;
let line_height = self.metrics.line_height;
let mut line_y = font_size;
let mut layout_i = 0;
for (line_i, line) in self.lines.iter().enumerate() {
let layout = match line.layout_opt.as_ref() {
Some(some) => some,
None => break,
};
let mut new_cursor = self.cursor;
for layout_line in layout {
let scrolled = layout_i < self.scroll;
layout_i += 1;
for run in self.layout_runs() {
let line_y = run.line_y;
if scrolled {
continue;
}
if mouse_y >= line_y - font_size
&& mouse_y < line_y - font_size + line_height
{
let mut new_cursor_glyph = run.glyphs.len();
let mut new_cursor_char = 0;
'hit: for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if mouse_x >= glyph.x as i32
&& mouse_x <= (glyph.x + glyph.w) as i32
{
new_cursor_glyph = glyph_i;
if line_y > self.height {
return;
}
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut egc_x = glyph.x;
let egc_w = glyph.w / (total as f32);
for (egc_i, egc) in cluster.grapheme_indices(true) {
if mouse_x >= egc_x as i32
&& mouse_x <= (egc_x + egc_w) as i32
{
new_cursor_char = egc_i;
if mouse_y >= line_y - font_size
&& mouse_y < line_y - font_size + line_height
{
let mut new_cursor_glyph = layout_line.glyphs.len();
let mut new_cursor_char = 0;
'hit: for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
if mouse_x >= glyph.x as i32
&& mouse_x <= (glyph.x + glyph.w) as i32
{
new_cursor_glyph = glyph_i;
let cluster = &line.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut egc_x = glyph.x;
let egc_w = glyph.w / (total as f32);
for (egc_i, egc) in cluster.grapheme_indices(true) {
if mouse_x >= egc_x as i32
&& mouse_x <= (egc_x + egc_w) as i32
{
new_cursor_char = egc_i;
let right_half = mouse_x >= (egc_x + egc_w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
}
break 'hit;
let right_half = mouse_x >= (egc_x + egc_w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
}
egc_x += egc_w;
break 'hit;
}
let right_half = mouse_x >= (glyph.x + glyph.w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char = cluster.len();
}
break 'hit;
egc_x += egc_w;
}
}
let mut new_cursor = TextCursor::new(TextLineIndex::new(line_i), 0);
match layout_line.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.index = glyph.start + new_cursor_char;
},
None => if let Some(glyph) = layout_line.glyphs.last() {
// Position at end of line
new_cursor.index = glyph.end;
},
}
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.redraw = true;
if let Some(glyph) = layout_line.glyphs.get(new_cursor_glyph) {
let font_opt = self.font_matches.get_font(&glyph.cache_key.font_id);
let text_glyph = &line.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line.get(),
self.cursor.index,
font_opt.map_or("?", |font| font.info.family.as_str()),
font_opt.map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
let right_half = mouse_x >= (glyph.x + glyph.w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char = cluster.len();
}
break 'hit;
}
}
line_y += line_height;
new_cursor.line = run.line_i;
new_cursor.index = 0;
match run.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.index = glyph.start + new_cursor_char;
},
None => if let Some(glyph) = run.glyphs.last() {
// Position at end of line
new_cursor.index = glyph.end;
},
}
if new_cursor != self.cursor {
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.font_matches.get_font(&glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line.get(),
self.cursor.index,
font_opt.map_or("?", |font| font.info.family.as_str()),
font_opt.map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
}
break;
}
}
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.redraw = true;
}
let duration = instant.elapsed();
log::trace!("click({}, {}): {:?}", mouse_x, mouse_y, duration);
}