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Improved highlighting of selection

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This commit is contained in:
Jeremy Soller 2022-10-24 19:11:28 -06:00
parent ef686f8f96
commit 1bf532a2fc
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 49 additions and 99 deletions
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148
src/buffer.rs
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@ -648,7 +648,7 @@ impl<'a> TextBuffer<'a> {
if let Some((i, c)) = line
.text
.grapheme_indices(true)
.take_while(|(i, c)| *i <= self.cursor.index)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
{
line.text.replace_range(i..(i + c.len()), "");
@ -694,11 +694,6 @@ impl<'a> TextBuffer<'a> {
let mut line_y = font_size;
let mut layout_i = 0;
for (line_i, line) in self.lines.iter().enumerate() {
let shape = match line.shape_opt.as_ref() {
Some(some) => some,
None => break,
};
let layout = match line.layout_opt.as_ref() {
Some(some) => some,
None => break,
@ -891,112 +886,67 @@ impl<'a> TextBuffer<'a> {
}
};
//TODO: do not calculate these on every line draw
let start_layout = self.layout_cursor(&start);
let end_layout = self.layout_cursor(&end);
// Check if this layout line is inside the selection
let mut inside = false;
if line_i > start.line.get() && line_i < end.line.get() {
// In between start and end lines, definitely inside selection
inside = true;
} else {
if line_i == start.line.get() && line_i == end.line.get() {
// On edge of start and end line, check if any contained glyphs are after start and before end
for glyph in layout_line.glyphs.iter() {
if glyph.end > start.index && glyph.start < end.index {
inside = true;
break;
}
}
} else if line_i == start.line.get() {
// On edge of start line, check if any contained glyphs are after start
for glyph in layout_line.glyphs.iter() {
if glyph.end > start.index {
inside = true;
break;
}
}
} else if line_i == end.line.get() {
// On edge of end line, check if any contained glyphs are before end
for glyph in layout_line.glyphs.iter() {
if glyph.start < end.index {
inside = true;
break;
}
}
}
}
if inside {
let (start_glyph, start_glyph_offset) = if start.line.get() == line_i {
cursor_glyph_opt(&start).unwrap_or((0, 0.0))
} else {
(0, 0.0)
};
let (end_glyph, end_glyph_offset) = if end.line.get() == line_i {
cursor_glyph_opt(&end).unwrap_or((layout_line.glyphs.len() + 1, 0.0))
} else {
(layout_line.glyphs.len() + 1, 0.0)
};
if end_glyph > start_glyph
|| (end_glyph == start_glyph && end_glyph_offset > start_glyph_offset)
{
let (left_x, right_x) = if shape.rtl {
(
layout_line.glyphs.get(end_glyph - 1).map_or(0, |glyph| {
(glyph.x - end_glyph_offset) as i32
}),
layout_line.glyphs.get(start_glyph).map_or(self.width, |glyph| {
(glyph.x + glyph.w - start_glyph_offset) as i32
}),
)
} else {
(
layout_line.glyphs.get(start_glyph).map_or(0, |glyph| {
(glyph.x + start_glyph_offset) as i32
}),
layout_line.glyphs.get(end_glyph - 1).map_or(self.width, |glyph| {
(glyph.x + glyph.w + end_glyph_offset) as i32
}),
)
};
/*
f(
left_x,
line_y - font_size,
cmp::max(0, right_x - left_x) as u32,
line_height as u32,
0x33_00_00_00 | (color & 0xFF_FF_FF)
);
*/
}
for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
if line_i >= start.line.get() && line_i <= end.line.get() {
let mut range_opt = None;
for glyph in layout_line.glyphs.iter() {
// Guess x offset based on characters
let cluster = &line.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut c_x = glyph.x;
let mut c_w = glyph.w / total as f32;
let c_w = glyph.w / total as f32;
for (i, c) in cluster.grapheme_indices(true) {
let c_start = glyph.start + i;
let c_end = glyph.start + i + c.len();
if (start.line.get() != line_i || c_end > start.index)
&& (end.line.get() != line_i || c_start < end.index) {
f(
c_x as i32,
line_y - font_size,
c_w as u32,
line_height as u32,
0x33_00_00_00 | (color & 0xFF_FF_FF)
);
range_opt = match range_opt.take() {
Some((min, max)) => Some((
cmp::min(min, c_x as i32),
cmp::max(max, (c_x + c_w) as i32),
)),
None => Some((
c_x as i32,
(c_x + c_w) as i32,
))
};
} else {
match range_opt.take() {
Some((min, max)) => {
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
0x33_00_00_00 | (color & 0xFF_FF_FF)
);
},
None => (),
}
}
c_x += c_w;
}
}
match range_opt.take() {
Some((mut min, mut max)) => {
if end.line.get() > line_i {
// Draw to end of line
if shape.rtl {
min = 0;
} else {
max = self.width;
}
}
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
0x33_00_00_00 | (color & 0xFF_FF_FF)
);
},
None => (),
}
}
}