Home | History | Annotate | Download | only in display 
      1 // Copyright 2013 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_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
      6 #define ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/display/display_controller.h"
     10 #include "base/callback.h"
     11 #include "base/gtest_prod_util.h"
     12 #include "base/timer/timer.h"
     13 #include "ui/gfx/display_observer.h"
     14 #include "ui/gfx/size.h"
     15 
     16 namespace chromeos {
     17 FORWARD_DECLARE_TEST(DisplayPreferencesTest, PreventStore);
     18 }  // namespace chromeos
     19 
     20 namespace views {
     21 class Label;
     22 class Widget;
     23 }  // namespace views
     24 
     25 namespace ash {
     26 namespace internal {
     27 // A class which manages the notification of display resolution change and
     28 // also manages the timeout in case the new resolution is unusable.
     29 class ASH_EXPORT ResolutionNotificationController
     30     : public gfx::DisplayObserver,
     31       public DisplayController::Observer {
     32  public:
     33   ResolutionNotificationController();
     34   virtual ~ResolutionNotificationController();
     35 
     36   // Updates the display resolution for |display_id| to |new_resolution| and
     37   // creates a notification for this change which offers a button to revert the
     38   // change in case something goes wrong. The notification times out if there's
     39   // only one display connected and the user is trying to modify its resolution.
     40   // In that case, the timeout has to be set since the user cannot make any
     41   // changes if something goes wrong.
     42   void SetDisplayResolutionAndNotify(
     43       int64 display_id,
     44       const gfx::Size& old_resolution,
     45       const gfx::Size& new_resolution,
     46       const base::Closure& accept_callback);
     47 
     48   // Returns true if the notification is visible or scheduled to be visible and
     49   // the notification times out.
     50   bool DoesNotificationTimeout();
     51 
     52   // Called by the notification delegate when the user accepts the display
     53   // resolution change. Set |close_notification| to true when the notification
     54   // should be removed.
     55   void AcceptResolutionChange(bool close_notification);
     56 
     57   // Called by the notification delegate when the user wants to revert the
     58   // display resolution change.
     59   void RevertResolutionChange();
     60 
     61  private:
     62   friend class ResolutionNotificationControllerTest;
     63   FRIEND_TEST_ALL_PREFIXES(ResolutionNotificationControllerTest, Timeout);
     64   FRIEND_TEST_ALL_PREFIXES(chromeos::DisplayPreferencesTest, PreventStore);
     65 
     66   // A struct to bundle the data for a single resolution change.
     67   struct ResolutionChangeInfo;
     68 
     69   static const int kTimeoutInSec;
     70   static const char kNotificationId[];
     71 
     72   // Create a new notification, or update its content if it already exists.
     73   void CreateOrUpdateNotification();
     74 
     75   // Called every second for timeout.
     76   void OnTimerTick();
     77 
     78   // gfx::DisplayObserver overrides:
     79   virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
     80   virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
     81   virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
     82 
     83   // DisplayController::Observer overrides:
     84   virtual void OnDisplayConfigurationChanged() OVERRIDE;
     85 
     86   static void SuppressTimerForTest();
     87 
     88   scoped_ptr<ResolutionChangeInfo> change_info_;
     89 
     90   DISALLOW_COPY_AND_ASSIGN(ResolutionNotificationController);
     91 };
     92 
     93 }  // namespace internal
     94 }  // namespace ash
     95 
     96 #endif  // ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_
     97