leyoda/cosmic-text
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This commit is contained in:
Jeremy Soller 2022-10-24 14:18:40 -06:00
parent 92a83fc4a6
commit 4107165128
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 41 additions and 9 deletions
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50
src/buffer.rs
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@ -5,6 +5,7 @@ use std::{
fmt,
time::Instant,
};
use unicode_segmentation::UnicodeSegmentation;
use crate::{FontLayoutLine, FontMatches, FontShapeLine};
@ -711,17 +712,43 @@ impl<'a> TextBuffer<'a> {
&& mouse_y < line_y - font_size + line_height
{
let mut new_cursor_glyph = layout_line.glyphs.len();
for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
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
&& 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 == !shape.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
if new_cursor_char >= cluster.len() {
new_cursor_glyph += 1;
new_cursor_char = 0;
}
}
break 'hit;
}
egc_x += egc_w;
}
let right_half = mouse_x >= (glyph.x + glyph.w / 2.0) as i32;
if right_half == !shape.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_glyph = glyph_i + 1;
} else {
new_cursor_glyph = glyph_i;
new_cursor_glyph += 1;
}
break 'hit;
}
}
@ -730,7 +757,7 @@ impl<'a> TextBuffer<'a> {
match layout_line.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.index = glyph.start;
new_cursor.index = glyph.start + new_cursor_char;
},
None => match layout_line.glyphs.last() {
Some(glyph) => {
@ -815,12 +842,11 @@ impl<'a> TextBuffer<'a> {
return Some((glyph_i, 0.0));
} else if cursor.index > glyph.start && cursor.index < glyph.end {
// Guess x offset based on characters
//TODO: use EGCs?
let mut before = 0;
let mut total = 0;
let cluster = &line.text[glyph.start..glyph.end];
for (i, _) in cluster.char_indices() {
for (i, _) in cluster.grapheme_indices(true) {
if glyph.start + i < cursor.index {
before += 1;
}
@ -861,6 +887,10 @@ 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() {
@ -907,7 +937,9 @@ impl<'a> TextBuffer<'a> {
(layout_line.glyphs.len() + 1, 0.0)
};
if end_glyph > start_glyph {
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| {