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editor: more intuitive cursor positioning

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Compute the nearest glyph edge instead of taking the one to the
left of the cursor.

Also fixes a segfault when trying to compute the position for an empty
buffer.
This commit is contained in:
Philipp Brüschweiler 2012-10-02 11:06:54 +02:00 committed by Kristian Høgsberg
parent 9f897c7a5f
commit 70f83679ee
1 changed files with 13 additions and 5 deletions
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18
clients/editor.c
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@ -153,18 +153,26 @@ text_layout_xy_to_index(struct text_layout *layout, double x, double y)
{
cairo_text_extents_t extents;
int i;
double d;
if (layout->num_glyphs == 0)
return 0;
cairo_scaled_font_glyph_extents(layout->font,
layout->glyphs, layout->num_glyphs,
&extents);
for (i = 1; i < layout->num_glyphs; i++) {
if (layout->glyphs[i].x >= x) {
return i - 1;
}
if (x < 0)
return 0;
for (i = 0; i < layout->num_glyphs - 1; ++i) {
d = layout->glyphs[i + 1].x - layout->glyphs[i].x;
if (x < layout->glyphs[i].x + d/2)
return i;
}
if (x >= layout->glyphs[layout->num_glyphs - 1].x && x < extents.width)
d = extents.width - layout->glyphs[layout->num_glyphs - 1].x;
if (x < layout->glyphs[layout->num_glyphs - 1].x + d/2)
return layout->num_glyphs - 1;
return layout->num_glyphs;