Give page/app menu native menu bar feel....

chrome/browser/gtk/browser_toolbar_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_BROWSER_TOOLBAR_GTK_H_
 #define CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 91 matching lines @@
   // Create a menu for the toolbar given the icon id and tooltip.  Returns the
   // widget created.
   GtkWidget* BuildToolbarMenuButton(
       int icon_id,
       const std::string& localized_tooltip,
       OwnedWidgetGtk* owner);
 
   // Connect signals for dragging a url onto the home button.
   void SetUpDragForHomeButton();
 
+  // Helper for the PageAppMenu event handlers. Pops down the currently active
+  // meun and pops up the other menu.
+  void ChangeActiveMenu(GtkWidget* active_menu, guint timestamp);
+
   // Gtk callback for the "expose-event" signal.
   static gboolean OnToolbarExpose(GtkWidget* widget, GdkEventExpose* e,
                                   BrowserToolbarGtk* toolbar);
 
   // Gtk callback for the "clicked" signal.
   static void OnButtonClick(GtkWidget* button, BrowserToolbarGtk* toolbar);
 
   // Gtk callback for the "button-release-event" signal.
   static gboolean OnButtonRelease(GtkWidget* button, GdkEventButton* event,
                                   BrowserToolbarGtk* toolbar);
 
   // Gtk callback to intercept mouse clicks to the menu buttons.
   static gboolean OnMenuButtonPressEvent(GtkWidget* button,
                                          GdkEventButton* event,
                                          BrowserToolbarGtk* toolbar);
 
   // Used for drags onto home button.
   static void OnDragDataReceived(GtkWidget* widget,
                                  GdkDragContext* drag_context,
                                  gint x, gint y,
                                  GtkSelectionData* data,
                                  guint info, guint time,
                                  BrowserToolbarGtk* toolbar);
 
+  // These event handlers are used to fake menu-bar behavior in the page and
+  // app menus.
+  static gboolean OnPageAppMenuMouseMotion(GtkWidget* widget,
+                                           GdkEventMotion* event,
+                                           BrowserToolbarGtk* toolbar);
+  static void OnPageAppMenuMoveCurrent(GtkWidget* widget,
+                                       GtkMenuDirectionType dir,
+                                       BrowserToolbarGtk* toolbar);
+
   // Initialize the background NineBox.
   void InitNineBox();
 
   // Ninebox for the toolbar background
   scoped_ptr<NineBox> background_ninebox_;
 
   // Gtk widgets. The toolbar is an hbox with each of the other pieces of the
   // toolbar placed side by side.
   GtkWidget* toolbar_;
 
@@ skipping 24 matching lines @@
   // Controls whether or not a home button should be shown on the toolbar.
   BooleanPrefMember show_home_button_;
 
   // The event state the last time we observed a button release event.
   int last_release_event_flags_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserToolbarGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_TOOLBAR_GTK_H_