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feat(mtext): character-level text selection on the preview

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The rendered MText preview is now interactive: drag across glyphs to select
a character range and apply toolbar formatting (bold, italic, underline,
overline, strike, case, alignment) to exactly those characters.

The text layout gains an opt-in pass that emits one world-space box per
visible character carrying its reading-order index; the editor maps those
boxes into the preview frame, hit-tests pointer drags against them, and
highlights the selection. Formatting splices the matching inline codes into
the raw value at the selected byte range (mapped via a code-aware visible-
character scanner). With no preview selection the Edit-box path is unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-05-31 02:33:47 +03:00
commit 32136dd9dd
9 changed files with 443 additions and 31 deletions
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14
src/app/update.rs
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@ -3546,6 +3546,20 @@ impl OpenCADStudio {
self.rebuild_mtext_preview();
Task::none()
}
Message::MTextSelStart(off) => {
if let Some(ed) = self.mtext_editor.as_mut() {
ed.sel_anchor = off;
ed.sel = Some((off, off));
}
Task::none()
}
Message::MTextSelTo(off) => {
if let Some(ed) = self.mtext_editor.as_mut() {
let a = ed.sel_anchor;
ed.sel = Some((a.min(off), a.max(off)));
}
Task::none()
}
Message::MTextOk => {
self.mtext_commit();
Task::none()