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      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 CHROME_BROWSER_CHROMEOS_LOGIN_UI_USER_ADDING_SCREEN_H_
      6 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_USER_ADDING_SCREEN_H_
      7 
      8 #include "base/basictypes.h"
      9 
     10 namespace chromeos {
     11 
     12 // An interface that defines screen for adding users into multi-profile session.
     13 // Current implementation is a singleton.
     14 // TODO(dzhioev): get rid of singleton.
     15 class UserAddingScreen {
     16  public:
     17   struct Observer {
     18     virtual void OnUserAddingStarted() {}
     19     virtual void OnUserAddingFinished() {}
     20     virtual ~Observer() {}
     21   };
     22 
     23   static UserAddingScreen* Get();
     24 
     25   virtual void Start() = 0;
     26   virtual void Cancel() = 0;
     27   virtual bool IsRunning() = 0;
     28 
     29   virtual void AddObserver(Observer* observer) = 0;
     30   virtual void RemoveObserver(Observer* observer) = 0;
     31 
     32  protected:
     33   UserAddingScreen();
     34   virtual ~UserAddingScreen();
     35 
     36   DISALLOW_COPY_AND_ASSIGN(UserAddingScreen);
     37 };
     38 
     39 }  // namespace chromeos
     40 
     41 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_USER_ADDING_SCREEN_H_
     42 
     43