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power_menu_button.h

// Copyright (c) 2006-2008 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_CHROMEOS_STATUS_POWER_MENU_BUTTON_H_
#define CHROME_BROWSER_CHROMEOS_STATUS_POWER_MENU_BUTTON_H_

#include "app/menus/menu_model.h"
#include "chrome/browser/chromeos/cros/power_library.h"
#include "chrome/browser/chromeos/status/status_area_button.h"
#include "views/controls/menu/menu_2.h"
#include "views/controls/menu/view_menu_delegate.h"

class SkBitmap;

namespace chromeos {

// The power menu button in the status area.
// This class will handle getting the power status and populating the menu.
class PowerMenuButton : public StatusAreaButton,
                        public views::ViewMenuDelegate,
                        public menus::MenuModel,
                        public PowerLibrary::Observer {
 public:
  PowerMenuButton();
  virtual ~PowerMenuButton();

  // menus::MenuModel implementation.
  virtual bool HasIcons() const  { return false; }
  virtual int GetItemCount() const;
  virtual menus::MenuModel::ItemType GetTypeAt(int index) const;
  virtual int GetCommandIdAt(int index) const { return index; }
  virtual string16 GetLabelAt(int index) const;
  virtual bool IsLabelDynamicAt(int index) const { return true; }
  virtual bool GetAcceleratorAt(int index,
      menus::Accelerator* accelerator) const { return false; }
  virtual bool IsItemCheckedAt(int index) const { return false; }
  virtual int GetGroupIdAt(int index) const { return 0; }
  virtual bool GetIconAt(int index, SkBitmap* icon) const { return false; }
  virtual bool IsEnabledAt(int index) const { return false; }
  virtual menus::MenuModel* GetSubmenuModelAt(int index) const { return NULL; }
  virtual void HighlightChangedTo(int index) {}
  virtual void ActivatedAt(int index) {}
  virtual void MenuWillShow() {}

  // PowerLibrary::Observer implementation.
  virtual void PowerChanged(PowerLibrary* obj);

  int icon_id() const { return icon_id_; }

 protected:
  // StatusAreaButton implementation.
  virtual void DrawPressed(gfx::Canvas* canvas);
  virtual void DrawIcon(gfx::Canvas* canvas);

 private:
  // views::ViewMenuDelegate implementation.
  virtual void RunMenu(views::View* source, const gfx::Point& pt);

  // This method will draw the |icon| in the appropriate place on the |canvas|.
  void DrawPowerIcon(gfx::Canvas* canvas, SkBitmap icon);

  // Update the power icon depending on the power status.
  void UpdateIcon();

  // The number of power images.
  static const int kNumPowerImages;

  // The power menu.
  views::Menu2 power_menu_;

  // The currently showing icon bitmap id.
  int icon_id_;

  DISALLOW_COPY_AND_ASSIGN(PowerMenuButton);
};

}  // namespace chromeos

#endif  // CHROME_BROWSER_CHROMEOS_STATUS_POWER_MENU_BUTTON_H_

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