implement on_select wrapper

src/app/browser/window/tab/item/identity/gemini/widget/form.rs

@@ -28,6 +28,9 @@ impl Form {
         gobject.append(list.gobject());
         gobject.append(name.gobject());
 
+        // Connect events
+        list.on_select(move |key| name.gobject().set_visible(key.is_none()));
+
         // Return activated `Self`
         Self { gobject }
     }

src/app/browser/window/tab/item/identity/gemini/widget/form/list.rs

@@ -42,13 +42,38 @@ impl List {
         self.model.append(&item);
     }
 
+    /* @TODO not in use
     /// Get selected `key` or panic on selection not found
     /// * return `None` if current selection key match `PROPERTY_KEY_NONE_VALUE`
     pub fn selected(&self) -> Option<i64> {
-        match self.gobject.selected_item() {
+        selected(&self.gobject)
-            Some(gobject) => {
+    }*/
+
+    // Events
+
+    /// Run callback function on `connect_selected_notify`
+    /// * return formatted key as result
+    pub fn on_select(&self, callback: impl Fn(Option<i64>) + 'static) {
+        self.gobject
+            .connect_selected_notify(move |this| callback(selected(this)));
+    }
+
+    // Getters
+
+    pub fn gobject(&self) -> &DropDown {
+        &self.gobject
+    }
+}
+
+// Tools
+
+/// Get selected `key` or panic on selection not found
+/// * return `None` if current selection key match `PROPERTY_KEY_NONE_VALUE`
+fn selected(list: &DropDown) -> Option<i64> {
+    match list.selected_item() {
+        Some(this) => {
             // Convert back from C-based GObject type
-                let key = gobject.property::<i64>(PROPERTY_KEY_NAME);
+            let key = this.property::<i64>(PROPERTY_KEY_NAME);
 
             if key == PROPERTY_KEY_NONE_VALUE {
                 None
@@ -59,10 +84,3 @@ impl List {
         None => panic!(),
     }
 }
-
-    // Getters
-
-    pub fn gobject(&self) -> &DropDown {
-        &self.gobject
-    }
-}