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Fix rendering of text selection with combining characters with the GL backend

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When the text selection end follows right after a grapheme that uses less
glyphs than characters, then there may not be a matching glyph with the byte
index, therefore we wouldn't set the selection_end_x and draw incorrectly.
Take the visual tail of the last glyph then.
This commit is contained in:
Simon Hausmann 2021-07-30 15:55:08 +02:00 • committed by Simon Hausmann
parent 17b3fbc7cf
commit d867d7b58a
1 changed files with 8 additions and 2 deletions
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10
sixtyfps_runtime/rendering_backends/gl/lib.rs
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@ -743,13 +743,19 @@ impl ItemRenderer for GLItemRenderer {
let (anchor_pos, cursor_pos) = text_input.selection_anchor_and_cursor();
let mut selection_start_x = 0.;
let mut selection_end_x = 0.;
// Determine the first and last (inclusive) glyph of the selection. The anchor
// will always be at the start of a grapheme boundary, so there's at ShapedGlyph
// that has a matching byte index. For the selection end we have to look for the
// visual end of glyph before the cursor, because due to for example ligatures
// (or generally glyph substitution) there may not be a dedicated glyph.
for glyph in &metrics.glyphs {
if glyph.byte_index == anchor_pos {
selection_start_x = glyph.x;
}
if glyph.byte_index == (cursor_pos as i32 - 1).max(0) as usize {
selection_end_x = glyph.x + glyph.advance_x;
if glyph.byte_index == cursor_pos {
break;
}
selection_end_x = glyph.x + glyph.advance_x;
}
let selection_rect = Rect::new(