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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_CHROMEOS_STATUS_CLOCK_MENU_BUTTON_H_
      6 #define CHROME_BROWSER_CHROMEOS_STATUS_CLOCK_MENU_BUTTON_H_
      7 #pragma once
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/timer.h"
     11 #include "chrome/browser/chromeos/cros/power_library.h"
     12 #include "chrome/browser/chromeos/status/status_area_button.h"
     13 #include "chrome/browser/prefs/pref_change_registrar.h"
     14 #include "chrome/browser/prefs/pref_member.h"
     15 #include "content/common/notification_observer.h"
     16 #include "content/common/notification_type.h"
     17 #include "chrome/browser/chromeos/system_access.h"
     18 #include "unicode/calendar.h"
     19 #include "views/controls/button/menu_button.h"
     20 #include "views/controls/menu/menu_2.h"
     21 #include "views/controls/menu/view_menu_delegate.h"
     22 
     23 namespace chromeos {
     24 
     25 class StatusAreaHost;
     26 
     27 // The clock menu button in the status area.
     28 // This button shows the current time.
     29 class ClockMenuButton : public StatusAreaButton,
     30                         public views::ViewMenuDelegate,
     31                         public ui::MenuModel,
     32                         public NotificationObserver,
     33                         public PowerLibrary::Observer,
     34                         public SystemAccess::Observer {
     35  public:
     36   explicit ClockMenuButton(StatusAreaHost* host);
     37   virtual ~ClockMenuButton();
     38 
     39   // ui::MenuModel implementation.
     40   virtual bool HasIcons() const  { return false; }
     41   virtual int GetItemCount() const;
     42   virtual ui::MenuModel::ItemType GetTypeAt(int index) const;
     43   virtual int GetCommandIdAt(int index) const { return index; }
     44   virtual string16 GetLabelAt(int index) const;
     45   virtual bool IsItemDynamicAt(int index) const { return true; }
     46   virtual bool GetAcceleratorAt(int index,
     47       ui::Accelerator* accelerator) const { return false; }
     48   virtual bool IsItemCheckedAt(int index) const { return false; }
     49   virtual int GetGroupIdAt(int index) const { return 0; }
     50   virtual bool GetIconAt(int index, SkBitmap* icon) { return false; }
     51   virtual ui::ButtonMenuItemModel* GetButtonMenuItemAt(int index) const {
     52     return NULL;
     53   }
     54   virtual bool IsEnabledAt(int index) const;
     55   virtual ui::MenuModel* GetSubmenuModelAt(int index) const { return NULL; }
     56   virtual void HighlightChangedTo(int index) {}
     57   virtual void ActivatedAt(int index);
     58   virtual void MenuWillShow() {}
     59   virtual void SetMenuModelDelegate(ui::MenuModelDelegate* delegate) {}
     60 
     61   // Overridden from ResumeLibrary::Observer:
     62   virtual void PowerChanged(PowerLibrary* obj) {}
     63   virtual void SystemResumed();
     64 
     65   // Overridden from SystemAccess::Observer:
     66   virtual void TimezoneChanged(const icu::TimeZone& timezone);
     67 
     68   // views::View
     69   virtual void OnLocaleChanged() OVERRIDE;
     70 
     71   // Updates the time on the menu button. Can be called by host if timezone
     72   // changes.
     73   void UpdateText();
     74 
     75   // NotificationObserver implementation.
     76   virtual void Observe(NotificationType type,
     77                        const NotificationSource& source,
     78                        const NotificationDetails& details);
     79 
     80  protected:
     81   virtual int horizontal_padding() { return 3; }
     82 
     83  private:
     84   // views::ViewMenuDelegate implementation.
     85   virtual void RunMenu(views::View* source, const gfx::Point& pt);
     86 
     87   // Updates text and schedules the timer to fire at the next minute interval.
     88   void UpdateTextAndSetNextTimer();
     89 
     90   base::OneShotTimer<ClockMenuButton> timer_;
     91 
     92   // The clock menu.
     93   // NOTE: we use a scoped_ptr here as menu calls into 'this' from the
     94   // constructor.
     95   scoped_ptr<views::Menu2> clock_menu_;
     96 
     97   PrefChangeRegistrar registrar_;
     98 
     99   DISALLOW_COPY_AND_ASSIGN(ClockMenuButton);
    100 };
    101 
    102 }  // namespace chromeos
    103 
    104 #endif  // CHROME_BROWSER_CHROMEOS_STATUS_CLOCK_MENU_BUTTON_H_
    105