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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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49
src/entities/mtext.rs
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@ -4,7 +4,7 @@ use glam::Vec3;
use crate::command::EntityTransform;
use crate::entities::common::{edit_prop as edit, ro_prop as ro, square_grip, triangle_grip};
use crate::entities::text_support::{
layout_mtext, resolve_text_style, MTextRenderOpts, MTextVAnchor,
layout_mtext, resolve_text_style, GlyphBox, MTextRenderOpts, MTextVAnchor,
};
use crate::entities::traits::{Grippable, PropertyEditable, Transformable, TruckConvertible};
use crate::scene::acad_to_truck::{TruckEntity, TruckObject};
@ -74,6 +74,52 @@ fn drawing_dir_str(d: &DrawingDirection) -> &'static str {
}
}
/// Per-visible-character world-space boxes for the MText editor's
/// click-to-select preview. Uses the exact same layout opts as `to_truck`
/// so the boxes line up with the rendered glyphs.
pub fn glyph_boxes(t: &MText, document: &acadrust::CadDocument) -> Vec<GlyphBox> {
let resolved_style = resolve_text_style(&t.style, document);
let attach_h_anchor: f32 = match t.attachment_point {
AttachmentPoint::TopCenter
| AttachmentPoint::MiddleCenter
| AttachmentPoint::BottomCenter => 0.5,
AttachmentPoint::TopRight | AttachmentPoint::MiddleRight | AttachmentPoint::BottomRight => {
1.0
}
_ => 0.0,
};
let v_anchor = match t.attachment_point {
AttachmentPoint::TopLeft | AttachmentPoint::TopCenter | AttachmentPoint::TopRight => {
MTextVAnchor::Top
}
AttachmentPoint::MiddleLeft
| AttachmentPoint::MiddleCenter
| AttachmentPoint::MiddleRight => MTextVAnchor::Middle,
AttachmentPoint::BottomLeft
| AttachmentPoint::BottomCenter
| AttachmentPoint::BottomRight => MTextVAnchor::Bottom,
};
let rotation = if resolved_style.is_upside_down {
t.rotation as f32 + std::f32::consts::PI
} else {
t.rotation as f32
};
let layout = layout_mtext(&MTextRenderOpts {
value: &t.value,
insertion: [t.insertion_point.x, t.insertion_point.y, t.insertion_point.z],
height: t.height as f32,
rect_w: t.rectangle_width as f32,
rotation,
style: &resolved_style,
attach_h_anchor,
v_anchor,
line_spacing_factor: t.line_spacing_factor as f32,
vertical_text: matches!(t.drawing_direction, DrawingDirection::TopToBottom),
want_glyph_boxes: true,
});
layout.glyph_boxes
}
fn to_truck(t: &MText, document: &acadrust::CadDocument) -> TruckEntity {
let resolved_style = resolve_text_style(&t.style, document);
let attach_h_anchor: f32 = match t.attachment_point {
@ -112,6 +158,7 @@ fn to_truck(t: &MText, document: &acadrust::CadDocument) -> TruckEntity {
v_anchor,
line_spacing_factor: t.line_spacing_factor as f32,
vertical_text: matches!(t.drawing_direction, DrawingDirection::TopToBottom),
want_glyph_boxes: false,
});
let insertion = Vec3::new(
t.insertion_point.x as f32,