chrome/browser/chromeos/login/screens/screen_flow.h

   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_