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      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 CHROME_BROWSER_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_
      6 #define CHROME_BROWSER_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_
      7 
      8 #include "ash/shell_observer.h"
      9 #include "chrome/browser/chromeos/login/ui/user_adding_screen.h"
     10 #include "chromeos/login/login_state.h"
     11 #include "ui/message_center/notification_blocker.h"
     12 
     13 // A notification blocker which checks screen lock / login state for ChromeOS.
     14 // This is different from ScreenLockNotificationBlocker because:
     15 //  - ScreenLockNotificationBlocker only cares about lock status but ChromeOS
     16 //    needs to care about login-screen.
     17 //  - ScreenLockNotificationBlocker needs a timer to check the screen lock state
     18 //    periodically, but ash::ShellObserver gets the events directly in ChromeOS.
     19 //  - In ChromeOS, some system notifications are allowed to be shown as popups.
     20 class LoginStateNotificationBlockerChromeOS
     21     : public message_center::NotificationBlocker,
     22       public ash::ShellObserver,
     23       public chromeos::LoginState::Observer,
     24       public chromeos::UserAddingScreen::Observer {
     25  public:
     26   explicit LoginStateNotificationBlockerChromeOS(
     27       message_center::MessageCenter* message_center);
     28   virtual ~LoginStateNotificationBlockerChromeOS();
     29 
     30  private:
     31   // message_center::NotificationBlocker overrides:
     32   virtual bool ShouldShowNotificationAsPopup(
     33       const message_center::NotifierId& notifier_id) const OVERRIDE;
     34 
     35   // ash::ShellObserver overrides:
     36   virtual void OnLockStateChanged(bool locked) OVERRIDE;
     37   virtual void OnAppTerminating() OVERRIDE;
     38 
     39   // chromeos::LoginState::Observer overrides:
     40   virtual void LoggedInStateChanged() OVERRIDE;
     41 
     42   // chromeos::UserAddingScreen::Observer overrides:
     43   virtual void OnUserAddingStarted() OVERRIDE;
     44   virtual void OnUserAddingFinished() OVERRIDE;
     45 
     46   bool locked_;
     47   bool observing_;
     48 
     49   DISALLOW_COPY_AND_ASSIGN(LoginStateNotificationBlockerChromeOS);
     50 };
     51 
     52 #endif  // CHROME_BROWSER_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_
     53