components/web_resource/eula_accepted_notifier.h

   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 COMPONENTS_WEB_RESOURCE_EULA_ACCEPTED_NOTIFIER_H_
   6 #define COMPONENTS_WEB_RESOURCE_EULA_ACCEPTED_NOTIFIER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/prefs/pref_change_registrar.h"
  10
  11 class PrefService;
  12
  13 namespace web_resource {
  14
  15 // Helper class for querying the EULA accepted state and receiving a
  16 // notification when the EULA is accepted.
  17 class EulaAcceptedNotifier {
  18  public:
  19   // Observes EULA accepted state changes.
  20   class Observer {
  21    public:
  22     virtual void OnEulaAccepted() = 0;
  23   };
  24
  25   explicit EulaAcceptedNotifier(PrefService* local_state);
  26   virtual ~EulaAcceptedNotifier();
  27
  28   // Initializes this class with the given |observer|. Must be called before
  29   // the class is used.
  30   void Init(Observer* observer);
  31
  32   // Returns true if the EULA has been accepted. If the EULA has not yet been
  33   // accepted, begins monitoring the EULA state and will notify the observer
  34   // once the EULA has been accepted.
  35   virtual bool IsEulaAccepted();
  36
  37   // Factory method for this class.
  38   static EulaAcceptedNotifier* Create(PrefService* local_state);
  39
  40  protected:
  41   // Notifies the observer that the EULA has been updated, made protected for
  42   // testing.
  43   void NotifyObserver();
  44
  45  private:
  46   // Callback for EULA accepted pref change notification.
  47   void OnPrefChanged();
  48
  49   // Local state pref service for querying the EULA accepted pref.
  50   PrefService* local_state_;
  51
  52   // Used to listen for the EULA accepted pref change notification.
  53   PrefChangeRegistrar registrar_;
  54
  55   // Observer of the EULA accepted notification.
  56   Observer* observer_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(EulaAcceptedNotifier);
  59 };
  60
  61 }  // namespace web_resource
  62
  63 #endif  // COMPONENTS_WEB_RESOURCE_EULA_ACCEPTED_NOTIFIER_H_