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