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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 CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_SCREEN_FLOW_H_
      6 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_SCREEN_FLOW_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 
     12 namespace chromeos {
     13 
     14 class ScreenContext;
     15 class ScreenManager;
     16 
     17 // Class that holds the logic of interpreting screen outcomes and moving between
     18 // the screens.
     19 class ScreenFlow {
     20  public:
     21   ScreenFlow();
     22   virtual ~ScreenFlow();
     23 
     24   // Called once the flow is set as a flow for specific screen manager.
     25   // Should usually result in get_manager()->ShowScreen call.
     26   virtual void Start() = 0;
     27 
     28   // Called when screen with |screen_id| finishes with |outcome|.
     29   // Additional result parameters may be passed via |context| (always not NULL).
     30   // Should result in get_manager()->ShowScreen call or in
     31   // get_manager()->SetScreenFlow call.
     32   virtual void OnScreenFinished(const std::string& screen_id,
     33                                 const std::string& outcome,
     34                                 ScreenContext* context) = 0;
     35  protected:
     36   ScreenManager* screen_manager() { return manager_; }
     37 
     38  private:
     39   friend class ScreenManager;
     40 
     41   void set_screen_manager(ScreenManager* manager) {
     42     manager_ = manager;
     43   }
     44 
     45   // Screen manager associated with this flow. Set by screen manager itself.
     46   ScreenManager* manager_;
     47 
     48   DISALLOW_COPY_AND_ASSIGN(ScreenFlow);
     49 };
     50 
     51 }  // namespace chromeos
     52 
     53 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_SCREEN_FLOW_H_
     54