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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 
IsClearPluginLSODataEnabled()40   bool IsClearPluginLSODataEnabled() const {
41     return clear_plugin_lso_data_enabled_.GetValue();
42   }
43 
IsPepperFlashSettingsEnabled()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