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