feat(egui): add radio buttons to choose language

locales/en-US/main.ftl

@@ -53,6 +53,9 @@ tr-menu-inspect = Inspect
 tr-menu-inspect-compare-detours = Compare Detours
 tr-menu-inspect-measure-length = Measure Length
 
+tr-menu-properties = Properties
+tr-menu-properties-set-language = Set Language
+
 tr-dialog-error-messages = Error Messages
 tr-dialog-error-messages-reset = Reset Messages
 tr-dialog-error-messages-discard = Discard

src/bin/topola-egui/app.rs

@@ -129,7 +129,7 @@ impl eframe::App for App {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         self.menu_bar.update(
             ctx,
-            &self.translator,
+            &mut self.translator,
             self.content_channel.0.clone(),
             &mut self.viewport,
             self.maybe_workspace.as_mut(),

src/bin/topola-egui/menu_bar.rs

@@ -56,7 +56,7 @@ impl MenuBar {
     pub fn update(
         &mut self,
         ctx: &egui::Context,
-        tr: &Translator,
+        tr: &mut Translator,
         content_sender: Sender<Result<SpecctraDesign, SpecctraLoadingError>>,
         viewport: &mut Viewport,
         maybe_workspace: Option<&mut Workspace>,
@@ -165,6 +165,19 @@ impl MenuBar {
                         });
                     });
 
+                    ui.menu_button(tr.text("tr-menu-properties"), |ui| {
+                        ui.menu_button(tr.text("tr-menu-properties-set-language"), |ui| {
+                            for langid in Translator::locales() {
+                                ui.radio_value(
+                                    tr.langid_mut(),
+                                    langid.clone(),
+                                    langid.language.as_str(),
+                                );
+                                //ui.add(egui::RadioButton::new(true, locale.language.as_str()));
+                            }
+                        });
+                    });
+
                     ui.menu_button(tr.text("tr-menu-help"), |ui| {
                         actions.help.online_documentation.hyperlink(
                             ctx,

src/bin/topola-egui/translator.rs

@@ -22,4 +22,12 @@ impl Translator {
     pub fn text(&self, fluent_id: &str) -> String {
         LOCALES.lookup(&self.langid, fluent_id)
     }
+
+    pub fn langid_mut(&mut self) -> &mut LanguageIdentifier {
+        &mut self.langid
+    }
+
+    pub fn locales() -> Box<dyn Iterator<Item = &'static LanguageIdentifier> + 'static> {
+        LOCALES.locales()
+    }
 }