views: Implement the window menu bar.

atom/browser/ui/views/menu_bar.h

@@ -5,21 +5,56 @@
 #ifndef ATOM_BROWSER_UI_VIEWS_MENU_BAR_H_
 #define ATOM_BROWSER_UI_VIEWS_MENU_BAR_H_
 
+#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/view.h"
 
+namespace ui {
+class MenuModel;
+}
+
+namespace views {
+class MenuButton;
+}
+
 namespace atom {
 
-class MenuBar : public views::View {
+class MenuDelegate;
+
+class MenuBar : public views::View,
+                public views::ButtonListener,
+                public views::MenuButtonListener {
  public:
   MenuBar();
   virtual ~MenuBar();
 
+  // Replaces current menu with a new one.
+  void SetMenu(ui::MenuModel* menu_model);
+
+  // Returns there are how many items in the root menu.
+  int GetItemCount() const;
+
+  // Get the menu under specified screen point.
+  bool GetMenuButtonFromScreenPoint(const gfx::Point& point,
+                                    ui::MenuModel** menu_model,
+                                    views::MenuButton** button);
+
  protected:
   // views::View:
-  virtual void Paint(gfx::Canvas* canvas) OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
 
+  // views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const ui::Event& event) OVERRIDE;
+
+  // views::MenuButtonListener:
+  virtual void OnMenuButtonClicked(views::View* source,
+                                   const gfx::Point& point) OVERRIDE;
+
  private:
+  ui::MenuModel* menu_model_;
+  scoped_ptr<MenuDelegate> menu_delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(MenuBar);
 };