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      1 // Copyright (c) 2012 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 ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
      6 #define ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
      7 
      8 #include <map>
      9 
     10 #include "ash/ash_export.h"
     11 #include "ash/display/display_controller.h"
     12 #include "ash/display/display_info.h"
     13 #include "ash/system/tray/system_tray_item.h"
     14 #include "base/strings/string16.h"
     15 #include "ui/views/view.h"
     16 
     17 namespace ash {
     18 namespace test {
     19 class AshTestBase;
     20 }
     21 
     22 namespace internal {
     23 class DisplayView;
     24 
     25 class ASH_EXPORT TrayDisplay : public SystemTrayItem,
     26                                public DisplayController::Observer {
     27  public:
     28   explicit TrayDisplay(SystemTray* system_tray);
     29   virtual ~TrayDisplay();
     30 
     31   // Overridden from DisplayControllerObserver:
     32   virtual void OnDisplayConfigurationChanged() OVERRIDE;
     33 
     34  private:
     35   friend class TrayDisplayTest;
     36 
     37   typedef std::map<int64, DisplayInfo> DisplayInfoMap;
     38 
     39   static const char kNotificationId[];
     40 
     41   // Scans the current display info and updates |display_info_|. Sets the
     42   // previous data to |old_info| if it's not NULL.
     43   void UpdateDisplayInfo(DisplayInfoMap* old_info);
     44 
     45   // Compares the current display settings with |old_info| and determine what
     46   // message should be shown for notification. Returns true if there's a
     47   // meaningful change. Note that it's possible to return true and set
     48   // |message_out| to empty, which means the notification should be removed. It
     49   // also sets |additional_message_out| which appears in the notification with
     50   // the |message_out|.
     51   bool GetDisplayMessageForNotification(
     52       const DisplayInfoMap& old_info,
     53       base::string16* message_out,
     54       base::string16* additional_message_out);
     55 
     56   // Creates or updates the display notification.
     57   void CreateOrUpdateNotification(const base::string16& message,
     58                                   const base::string16& additional_message);
     59 
     60   // Overridden from SystemTrayItem.
     61   virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
     62   virtual void DestroyDefaultView() OVERRIDE;
     63 
     64   // Test accessors.
     65   base::string16 GetDefaultViewMessage() const;
     66   const views::View* default_view() const {
     67     return reinterpret_cast<views::View*>(default_);
     68   }
     69 
     70   DisplayView* default_;
     71   DisplayInfoMap display_info_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(TrayDisplay);
     74 };
     75 
     76 }  // namespace internal
     77 }  // namespace ash
     78 
     79 #endif  // ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
     80