1 // Copyright (c) 2011 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_PLUGIN_DATA_REMOVER_HELPER_H_ 6 #define CHROME_BROWSER_PLUGIN_DATA_REMOVER_HELPER_H_ 7 #pragma once 8 9 #include "base/memory/ref_counted.h" 10 #include "chrome/browser/prefs/pref_member.h" 11 #include "content/common/notification_observer.h" 12 #include "content/common/notification_registrar.h" 13 14 class Profile; 15 16 // Helper class modeled after BooleanPrefMember to (asynchronously) update 17 // the preference specifying whether clearing plug-in data is supported 18 // by an installed plug-in. 19 // It should only be used from the UI thread. The client has to make sure that 20 // the passed PrefService outlives this object. 21 class PluginDataRemoverHelper : public NotificationObserver { 22 public: 23 PluginDataRemoverHelper(); 24 ~PluginDataRemoverHelper(); 25 26 // Binds this object to the |pref_name| preference in |prefs|, notifying 27 // |observer| if the value changes. 28 // This fires off a request to the NPAPI::PluginList (via PluginDataRemover) 29 // on the FILE thread to get the list of installed plug-ins. 30 void Init(const char* pref_name, 31 PrefService* prefs, 32 NotificationObserver* observer); 33 GetValue()34 bool GetValue() const { return pref_.GetValue(); } 35 36 // NotificationObserver methods: 37 virtual void Observe(NotificationType type, 38 const NotificationSource& source, 39 const NotificationDetails& details); 40 41 private: 42 class Internal; 43 44 BooleanPrefMember pref_; 45 NotificationRegistrar registrar_; 46 scoped_refptr<Internal> internal_; 47 48 DISALLOW_COPY_AND_ASSIGN(PluginDataRemoverHelper); 49 }; 50 51 #endif // CHROME_BROWSER_PLUGIN_DATA_REMOVER_HELPER_H_ 52