Ribbon key tips: Alt shows codes on tabs, buttons and menu items

A lone Alt shows a code on every ribbon tab and quick-access button.
Typing a tab code opens the tab and shows the codes of its buttons,
dropdowns, slide-outs and collapsed panels; a button code runs it, a
dropdown or slide-out code opens it and shows its item codes, Esc goes
back one level. Codes follow the reference ribbon; buttons without a
reference counterpart get none and unnamed menu items are numbered.

Codes are drawn as accent pills over the widgets that reported their
bounds in the current frame, with a hint bar under the ribbon. While
the tips are open keys go to them only. The automation gets a keytips
action and read operation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/control/actions.rs

@@ -114,6 +114,7 @@ pub(super) const NAMES: &[&str] = &[
     "pc_section",
     "ribbon_tab",
     "ribbon_dropdown",
+    "keytips",
     "dialog_ok",
     "attdef_dialog",
     "field_dialog",
@@ -1884,6 +1885,28 @@ impl OpenCADStudio {
                 })
             }
             "ribbon_dropdown" => Message::ToggleRibbonDropdown(string(req, "value")?.into()),
+            // Ribbon key tips: `show`, `alt` (a lone Alt), `type:<codes>`, `enter`,
+            // `esc` or `hide`. Read them back with the `keytips` read operation.
+            "keytips" => {
+                use crate::ui::ribbon::KeyTipInput as K;
+                let value = string(req, "value")?;
+                let inputs: Vec<K> = match value {
+                    "show" => vec![K::Open { refocus: false }],
+                    "alt" => vec![K::AltTap],
+                    "esc" => vec![K::Escape],
+                    "hide" => vec![K::Hide],
+                    "enter" => vec![K::Enter],
+                    _ => match value.strip_prefix("type:") {
+                        Some(codes) if !codes.is_empty() => codes
+                            .chars()
+                            .map(|ch| K::Char(ch.to_uppercase().collect()))
+                            .collect(),
+                        _ => return Err(failure("invalid_value", "Use show, alt, type:<codes>, enter, esc or hide")),
+                    },
+                };
+                let tasks: Vec<_> = inputs.into_iter().map(|input| self.on_keytip(input)).collect();
+                return Ok(Task::batch(tasks));
+            }
             // The -VIEW Background dialog, one field per call: "type=gradient",
             // "color|top|middle|bottom=r,g,b", "three=1", "rotation=30",
             // "image=<path>", "position=center|stretch|tile", "aspect=1", "offset=x,y" (pixels), "scale=x,y",

src/app/control/mod.rs

@@ -559,6 +559,7 @@ impl OpenCADStudio {
                 | "audit"
                 | "text_search"
                 | "text_audit"
+                | "keytips"
         );
         if !query && !self.control.enabled {
             return (
@@ -850,6 +851,7 @@ impl OpenCADStudio {
                     }
                 }
                 "grips" => self.control_grips(),
+                "keytips" => self.ribbon.keytips_json(req["detail"].as_str() == Some("full")),
                 "xdata_get" => self.xdata_read(&req),
                 "get_selection" => self.control_get_selection(),
                 "text_search" => self.control_text_search(&req).unwrap_or_else(|e| e),