ash/system/session/logout_confirmation_controller.h

   1 // Copyright 2014 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_LOGOUT_CONFIRMATION_CONTROLLER_H_
   6 #define ASH_SYSTEM_SESSION_LOGOUT_CONFIRMATION_CONTROLLER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ash/shell_observer.h"
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/time/time.h"
  14 #include "base/timer/timer.h"
  15
  16 namespace base {
  17 class TickClock;
  18 }
  19
  20 namespace ash {
  21 namespace internal {
  22
  23 class LogoutConfirmationDialog;
  24
  25 // This class shows a dialog asking the user to confirm or deny logout and
  26 // terminates the session if the user either confirms or allows the countdown
  27 // shown in the dialog to expire.
  28 // It is guaranteed that no more than one confirmation dialog will be visible at
  29 // any given time. If there are multiple requests to show a confirmation dialog
  30 // at the same time, the dialog whose countdown expires first is shown.
  31 class ASH_EXPORT LogoutConfirmationController : public ShellObserver {
  32  public:
  33   // The |logout_closure| must be safe to call as long as |this| is alive.
  34   explicit LogoutConfirmationController(const base::Closure& logout_closure);
  35   virtual ~LogoutConfirmationController();
  36
  37   base::TickClock* clock() const { return clock_.get(); }
  38
  39   // Shows a LogoutConfirmationDialog. If a confirmation dialog is already being
  40   // shown, it is closed and a new one opened if |logout_time| is earlier than
  41   // the current dialog's |logout_time_|.
  42   void ConfirmLogout(base::TimeTicks logout_time);
  43
  44   void SetClockForTesting(scoped_ptr<base::TickClock> clock);
  45
  46   // ShellObserver:
  47   virtual void OnLockStateChanged(bool locked) OVERRIDE;
  48
  49   // Called by the |dialog_| when the user confirms logout.
  50   void OnLogoutConfirmed();
  51
  52   // Called by the |dialog_| when it is closed.
  53   void OnDialogClosed();
  54
  55  private:
  56   scoped_ptr<base::TickClock> clock_;
  57   base::Closure logout_closure_;
  58
  59   base::TimeTicks logout_time_;
  60   LogoutConfirmationDialog* dialog_;  // Owned by the Views hierarchy.
  61   base::Timer logout_timer_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationController);
  64 };
  65
  66 }  // namespace internal
  67 }  // namespace ash
  68
  69 #endif  // ASH_SYSTEM_SESSION_LOGOUT_CONFIRMATION_CONTROLLER_H_