first pass at menu event emission

atom/browser/api/atom_api_menu.cc

@@ -153,6 +153,14 @@ bool Menu::IsVisibleAt(int index) const {
   return model_->IsVisibleAt(index);
 }
 
+void Menu::OnMenuWillClose() {
+  Emit("menu-will-close");
+}
+
+void Menu::OnMenuWillShow() {
+  Emit("menu-will-show");
+}
+
 // static
 void Menu::BuildPrototype(v8::Isolate* isolate,
                           v8::Local<v8::FunctionTemplate> prototype) {

atom/browser/api/atom_api_menu.h

@@ -60,6 +60,10 @@ class Menu : public mate::TrackableObject<Menu>,
   std::unique_ptr<AtomMenuModel> model_;
   Menu* parent_;
 
+  // Observable:
+  void OnMenuWillClose() override;
+  void OnMenuWillShow() override;
+
  private:
   void InsertItemAt(int index, int command_id, const base::string16& label);
   void InsertSeparatorAt(int index);

atom/browser/ui/atom_menu_model.cc

@@ -42,8 +42,16 @@ bool AtomMenuModel::GetAcceleratorAtWithParams(
 
 void AtomMenuModel::MenuWillClose() {
   ui::SimpleMenuModel::MenuWillClose();
-  for (Observer& observer : observers_)
-    observer.MenuWillClose();
+  for (Observer& observer : observers_) {
+    observer.OnMenuWillClose();
+  }
+}
+
+void AtomMenuModel::MenuWillShow() {
+  ui::SimpleMenuModel::MenuWillShow();
+  for (Observer& observer : observers_) {
+    observer.OnMenuWillShow();
+  }
 }
 
 AtomMenuModel* AtomMenuModel::GetSubmenuModelAt(int index) {

atom/browser/ui/atom_menu_model.h

@@ -36,8 +36,11 @@ class AtomMenuModel : public ui::SimpleMenuModel {
    public:
     virtual ~Observer() {}
 
+    // Notifies the menu will open.
+    virtual void OnMenuWillShow() {}
+
     // Notifies the menu has been closed.
-    virtual void MenuWillClose() {}
+    virtual void OnMenuWillClose() {}
   };
 
   explicit AtomMenuModel(Delegate* delegate);
@@ -54,6 +57,7 @@ class AtomMenuModel : public ui::SimpleMenuModel {
 
   // ui::SimpleMenuModel:
   void MenuWillClose() override;
+  void MenuWillShow() override;
 
   using SimpleMenuModel::GetSubmenuModelAt;
   AtomMenuModel* GetSubmenuModelAt(int index);

atom/browser/ui/tray_icon_cocoa.h

@@ -35,7 +35,7 @@ class TrayIconCocoa : public TrayIcon,
 
  protected:
   // AtomMenuModel::Observer:
-  void MenuWillClose() override;
+  void OnMenuWillClose() override;
 
  private:
   // Atom custom view for NSStatusItem.

atom/browser/ui/tray_icon_cocoa.mm

@@ -461,7 +461,7 @@ gfx::Rect TrayIconCocoa::GetBounds() {
   return bounds;
 }
 
-void TrayIconCocoa::MenuWillClose() {
+void TrayIconCocoa::OnMenuWillClose() {
   [status_item_view_ setNeedsDisplay:YES];
 }