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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_GTK_GLOBAL_MENU_BAR_H_
      6 #define CHROME_BROWSER_UI_GTK_GLOBAL_MENU_BAR_H_
      7 
      8 #include <map>
      9 
     10 #include "chrome/browser/command_updater.h"
     11 #include "content/common/notification_observer.h"
     12 #include "content/common/notification_registrar.h"
     13 #include "ui/base/gtk/gtk_signal.h"
     14 
     15 class Browser;
     16 class BrowserWindowGtk;
     17 struct GlobalMenuBarCommand;
     18 
     19 typedef struct _GtkAccelGroup GtkAccelGroup;
     20 typedef struct _GtkWidget GtkWidget;
     21 
     22 // Controls the Mac style menu bar on Linux.
     23 //
     24 // Unity and some configurations of GNOME have a Apple-like menu bar at the top
     25 // of the screen that changes depending on the active window. These mainly work
     26 // by inspecting the application's widget hierarchy, and intercepting any
     27 // GtkMenuBar found. Thankfully, these systems don't check to see if the menu
     28 // bar itself is visible, so we insert a GtkMenuBar into the window hierarchy
     29 // and set it to be invisible.
     30 class GlobalMenuBar : public CommandUpdater::CommandObserver,
     31                       public NotificationObserver {
     32  public:
     33   GlobalMenuBar(Browser* browser, BrowserWindowGtk* window);
     34   virtual ~GlobalMenuBar();
     35 
     36   GtkWidget* widget() { return menu_bar_; }
     37 
     38  private:
     39   typedef std::map<int, GtkWidget*> IDMenuItemMap;
     40 
     41   // Helper function that builds the data.
     42   void BuildGtkMenuFrom(int menu_str_id,
     43                         std::map<int, GtkWidget*>* id_to_menu_item,
     44                         GlobalMenuBarCommand* commands);
     45 
     46   // CommandUpdater::CommandObserver:
     47   virtual void EnabledStateChangedForCommand(int id, bool enabled);
     48 
     49   // NotificationObserver:
     50   virtual void Observe(NotificationType type,
     51                        const NotificationSource& source,
     52                        const NotificationDetails& details);
     53 
     54   CHROMEGTK_CALLBACK_0(GlobalMenuBar, void, OnItemActivated);
     55 
     56   Browser* browser_;
     57   BrowserWindowGtk* browser_window_;
     58 
     59   NotificationRegistrar registrar_;
     60 
     61   // Our menu bar widget.
     62   GtkWidget* menu_bar_;
     63 
     64   // For some menu items, we want to show the accelerator, but not actually
     65   // explicitly handle it. To this end we connect those menu items' accelerators
     66   // to this group, but don't attach this group to any top level window.
     67   GtkAccelGroup* dummy_accel_group_;
     68 
     69   // A mapping from command ids to GtkMenuItem objects. We use this to update
     70   // the enable state since we are a .
     71   IDMenuItemMap id_to_menu_item_;
     72 
     73   // gtk_check_menu_item_set_active() will call the "activate" signal. We need
     74   // to block this activation while we change the checked state.
     75   bool block_activation_;
     76 };
     77 
     78 #endif  // CHROME_BROWSER_UI_GTK_GLOBAL_MENU_BAR_H_
     79