Port the Menu class to GTK.

chrome/browser/gtk/menu_gtk.h

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_GTK_MENU_GTK_H_
+#define CHROME_BROWSER_GTK_MENU_GTK_H_
+
+#include <gtk/gtk.h>
+
+#include "chrome/browser/gtk/standard_menus.h"
+
+class MenuGtk {
+ public:
+  // Delegate class that lets another class control the status of the menu.
+  class Delegate {
+   public:
+    virtual ~Delegate() { }
+
+    // Returns whether the menu item for this command should be enabled.
+    virtual bool IsCommandEnabled(int command_id) const = 0;
+
+    // Returns whether this command.
+    virtual bool IsItemChecked(int command_id) const = 0;
+
+    // Executes the command.
+    virtual void ExecuteCommand(int command_id) = 0;
+  };
+
+  MenuGtk(MenuGtk::Delegate* delegate, const MenuCreateMaterial* menu_data);
+  ~MenuGtk();
+
+  // Displays the menu
+  void Popup(GtkWidget* widget, GdkEvent* event);
+
+ private:
+  // A recursive function that transforms a MenuCreateMaterial tree into a set
+  // of GtkMenuItems.
+  void BuildMenuIn(GtkWidget* menu, const MenuCreateMaterial* menu_data);
+
+  // Callback for when a menu item is clicked.
+  static void OnMenuItemActivated(GtkMenuItem* menuitem, MenuGtk* menu);
+
+  // Repositions the menu to be right under the button.
+  static void MenuPositionFunc(GtkMenu* menu,
+                               int* x,
+                               int* y,
+                               gboolean* push_in,
+                               void* void_widget);
+
+  // Sets the check mark and enabled/disabled state on our menu items.
+  static void SetMenuItemInfo(GtkWidget* widget, void* raw_menu);
+
+  // Queries this object about the menu state.
+  MenuGtk::Delegate* delegate_;
+
+  // gtk_menu_popup() does not appear to take ownership of popup menus, so
+  // MenuGtk explicitly manages the lifetime of the menu.
+  GtkWidget* menu_;
+};
+
+#endif  // CHROME_BROWSER_GTK_MENU_GTK_H_