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up and down in textedit

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This commit is contained in:
Alessandro Mauri 2025-09-25 23:16:18 +02:00
parent 24216e4ab4
commit 63b3d05b19
1 changed files with 20 additions and 3 deletions
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23
lib/ugui.c3l/src/ugui_textedit.c3
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@ -58,7 +58,7 @@ fn bool Ctx.text_edit(&ctx, TextEdit* te)
free += how_many;
}
}
// handle arrow keys
if (mod.left) {
if (te.cursor > 0) {
@ -75,10 +75,27 @@ fn bool Ctx.text_edit(&ctx, TextEdit* te)
}
}
if (mod.up) {
// TODO
// back up to previous line
if (te.cursor > 0) {
usz curr_line_start = te.until_cursor().rindex_of_char('\n') ?? 0;
usz prev_line_start = curr_line_start ? te.until_cursor()[..curr_line_start-1].rindex_of_char('\n') ?? 0 : 0;
usz curr_line_off = te.cursor - curr_line_start;
usz prev_line_len = curr_line_start - prev_line_start;
te.cursor = prev_line_start + min(curr_line_off-1, prev_line_len);
after = te.chars - te.cursor;
}
}
if (mod.down) {
// TODO
// down to the next line
if (after > 0) {
usz curr_line_start = te.until_cursor().rindex_of_char('\n') ?? 0;
usz curr_line_off = te.cursor - curr_line_start;
usz next_line_start = te.from_cursor().index_of_char('\n') + te.cursor + 1 ?? te.chars;
usz next_line_end = ((String)te.buffer[next_line_start..]).index_of_char('\n') + next_line_start ?? te.chars;
usz next_line_len = next_line_end - next_line_start;
te.cursor = next_line_start + min(curr_line_off, next_line_len);
after = te.chars - te.cursor;
}
}
}