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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_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 
     18 namespace test {
     19 class TraySessionLengthLimitTest;
     20 }
     21 
     22 namespace internal {
     23 
     24 namespace tray {
     25 class RemainingSessionTimeTrayView;
     26 }
     27 
     28 // Adds a countdown timer to the system tray if the session length is limited.
     29 class ASH_EXPORT TraySessionLengthLimit : public SystemTrayItem,
     30                                           public SessionLengthLimitObserver {
     31  public:
     32   enum LimitState {
     33     LIMIT_NONE,
     34     LIMIT_SET,
     35     LIMIT_EXPIRING_SOON
     36   };
     37 
     38   explicit TraySessionLengthLimit(SystemTray* system_tray);
     39   virtual ~TraySessionLengthLimit();
     40 
     41   // SystemTrayItem:
     42   virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
     43   virtual void DestroyTrayView() OVERRIDE;
     44   virtual void UpdateAfterShelfAlignmentChange(
     45       ShelfAlignment alignment) OVERRIDE;
     46 
     47   // SessionLengthLimitObserver:
     48   virtual void OnSessionStartTimeChanged() OVERRIDE;
     49   virtual void OnSessionLengthLimitChanged() OVERRIDE;
     50 
     51   LimitState GetLimitState() const;
     52   base::TimeDelta GetRemainingSessionTime() const;
     53 
     54  private:
     55   friend class test::TraySessionLengthLimitTest;
     56 
     57   static const char kNotificationId[];
     58 
     59   void Update();
     60 
     61   bool IsTrayViewVisibleForTest();
     62 
     63   tray::RemainingSessionTimeTrayView* tray_view_;
     64 
     65   LimitState limit_state_;
     66   base::TimeTicks session_start_time_;
     67   base::TimeDelta limit_;
     68   base::TimeDelta remaining_session_time_;
     69   scoped_ptr<base::RepeatingTimer<TraySessionLengthLimit> > timer_;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(TraySessionLengthLimit);
     72 };
     73 
     74 }  // namespace internal
     75 }  // namespace ash
     76 
     77 #endif  // ASH_SYSTEM_SESSION_LENGTH_LIMIT_TRAY_SESSION_LENGTH_LIMIT_H_
     78