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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_PLUGINS_PLUGIN_STATUS_PREF_SETTER_H_
      6 #define CHROME_BROWSER_PLUGINS_PLUGIN_STATUS_PREF_SETTER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/memory/ref_counted.h"
     11 #include "base/memory/weak_ptr.h"
     12 #include "base/prefs/pref_member.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 
     16 class PluginPrefs;
     17 class PrefService;
     18 class Profile;
     19 
     20 namespace content {
     21 struct WebPluginInfo;
     22 }
     23 
     24 // Helper class modeled after BooleanPrefMember to (asynchronously) update
     25 // preferences related to plugin enable status.
     26 // It should only be used from the UI thread. The client has to make sure that
     27 // the passed profile outlives this object.
     28 class PluginStatusPrefSetter : public content::NotificationObserver {
     29  public:
     30   PluginStatusPrefSetter();
     31   virtual ~PluginStatusPrefSetter();
     32 
     33   // Binds the preferences in the profile's PrefService, notifying |observer| if
     34   // any value changes.
     35   // This asynchronously calls the PluginService to get the list of installed
     36   // plug-ins.
     37   void Init(Profile* profile,
     38             const BooleanPrefMember::NamedChangeCallback& observer);
     39 
     40   bool IsClearPluginLSODataEnabled() const {
     41     return clear_plugin_lso_data_enabled_.GetValue();
     42   }
     43 
     44   bool IsPepperFlashSettingsEnabled() const {
     45     return pepper_flash_settings_enabled_.GetValue();
     46   }
     47 
     48   // content::NotificationObserver methods:
     49   virtual void Observe(int type,
     50                        const content::NotificationSource& source,
     51                        const content::NotificationDetails& details) OVERRIDE;
     52 
     53  private:
     54   void StartUpdate();
     55   void GotPlugins(scoped_refptr<PluginPrefs> plugin_prefs,
     56                   const std::vector<content::WebPluginInfo>& plugins);
     57 
     58   content::NotificationRegistrar registrar_;
     59   // Weak pointer.
     60   Profile* profile_;
     61 
     62   // Whether clearing LSO data is supported.
     63   BooleanPrefMember clear_plugin_lso_data_enabled_;
     64   // Whether we should show Pepper Flash-specific settings.
     65   BooleanPrefMember pepper_flash_settings_enabled_;
     66 
     67   base::WeakPtrFactory<PluginStatusPrefSetter> factory_;
     68 
     69   DISALLOW_COPY_AND_ASSIGN(PluginStatusPrefSetter);
     70 };
     71 
     72 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_STATUS_PREF_SETTER_H_
     73