src/ash/system/session_length_limit/tray_session_length_limit.h

   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_SESSION_LENGTH_LIMIT_TRAY_SESSION_LENGTH_LIMIT_H_
   6 #define ASH_SYSTEM_SESSION_LENGTH_LIMIT_TRAY_SESSION_LENGTH_LIMIT_H_
   7
   8 #include "ash/system/session_length_limit/session_length_limit_observer.h"
   9 #include "ash/system/tray/system_tray_item.h"
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/time/time.h"
  14 #include "base/timer/timer.h"
  15
  16 namespace ash {
  17 namespace internal {
  18
  19 namespace tray {
  20 class RemainingSessionTimeTrayView;
  21 }
  22
  23 // Adds a countdown timer to the system tray if the session length is limited.
  24 class TraySessionLengthLimit : public SystemTrayItem,
  25                                public SessionLengthLimitObserver {
  26  public:
  27   enum LimitState {
  28     LIMIT_NONE,
  29     LIMIT_SET,
  30     LIMIT_EXPIRING_SOON
  31   };
  32
  33   explicit TraySessionLengthLimit(SystemTray* system_tray);
  34   virtual ~TraySessionLengthLimit();
  35
  36   // SystemTrayItem:
  37   virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
  38   virtual void DestroyTrayView() OVERRIDE;
  39   virtual void UpdateAfterShelfAlignmentChange(
  40       ShelfAlignment alignment) OVERRIDE;
  41
  42   // SessionLengthLimitObserver:
  43   virtual void OnSessionStartTimeChanged() OVERRIDE;
  44   virtual void OnSessionLengthLimitChanged() OVERRIDE;
  45
  46   LimitState GetLimitState() const;
  47   base::TimeDelta GetRemainingSessionTime() const;
  48
  49  private:
  50   void Update();
  51
  52   tray::RemainingSessionTimeTrayView* tray_view_;
  53
  54   LimitState limit_state_;
  55   base::TimeTicks session_start_time_;
  56   base::TimeDelta limit_;
  57   base::TimeDelta remaining_session_time_;
  58   scoped_ptr<base::RepeatingTimer<TraySessionLengthLimit> > timer_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(TraySessionLengthLimit);
  61 };
  62
  63 }  // namespace internal
  64 }  // namespace ash
  65
  66 #endif  // ASH_SYSTEM_SESSION_LENGTH_LIMIT_TRAY_SESSION_LENGTH_LIMIT_H_