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| 1 // Copyright 2014 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_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_ |
| 6 #define CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_ |
| 7 |
| 8 #include "base/callback.h" |
| 9 #include "base/files/file_path.h" |
| 10 #include "base/macros.h" |
| 11 #include "base/memory/ref_counted.h" |
| 12 #include "base/observer_list.h" |
| 13 #include "base/prefs/json_pref_store.h" |
| 14 #include "base/prefs/pref_change_registrar.h" |
| 15 #include "base/prefs/pref_service.h" |
| 16 #include "base/prefs/pref_store.h" |
| 17 #include "content/public/browser/host_zoom_map.h" |
| 18 |
| 19 namespace base { |
| 20 class DictionaryValue; |
| 21 } |
| 22 |
| 23 namespace chrome { |
| 24 |
| 25 // A class to manage per-partition default and per-host zoom levels in Chrome's |
| 26 // preference system. It implements an interface between the content/ zoom |
| 27 // levels in HostZoomMap and Chrome's preference system. All changes |
| 28 // to the per-partition default zoom levels from chrome/ flow through this |
| 29 // class. Any changes to per-host levels are updated when HostZoomMap calls |
| 30 // OnZoomLevelChanged. |
| 31 class ChromeZoomLevelPrefs { |
| 32 public: |
| 33 typedef base::CallbackList<void(void)>::Subscription |
| 34 DefaultZoomLevelSubscription; |
| 35 |
| 36 // Initialize the pref_service and the profile_path via the constructor, |
| 37 // as these concepts won't be available in the content base class |
| 38 // (to be added later) which will define the InitPrefsAndCopyToHostZoomMap |
| 39 // interface. |pref_service_| must outlive this class. |
| 40 ChromeZoomLevelPrefs(PrefService* pref_service, |
| 41 const base::FilePath& profile_path); |
| 42 virtual ~ChromeZoomLevelPrefs(); |
| 43 |
| 44 static std::string GetHashForTesting(const base::FilePath& relative_path); |
| 45 |
| 46 virtual void InitPrefsAndCopyToHostZoomMap( |
| 47 const base::FilePath& partition_path, |
| 48 content::HostZoomMap* host_zoom_map); |
| 49 |
| 50 void SetDefaultZoomLevelPref(double level); |
| 51 double GetDefaultZoomLevelPref() const; |
| 52 scoped_ptr<DefaultZoomLevelSubscription> RegisterDefaultZoomLevelCallback( |
| 53 const base::Closure& callback); |
| 54 |
| 55 void ExtractPerHostZoomLevels( |
| 56 const base::DictionaryValue* host_zoom_dictionary); |
| 57 |
| 58 private: |
| 59 // This is a callback function that receives notifications from HostZoomMap |
| 60 // when per-host zoom levels change. It is used to update the per-host |
| 61 // zoom levels (if any) managed by this class (for its associated partition). |
| 62 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); |
| 63 |
| 64 PrefService* pref_service_; |
| 65 const base::FilePath profile_path_; |
| 66 content::HostZoomMap* host_zoom_map_; |
| 67 scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_; |
| 68 std::string partition_key_; |
| 69 base::CallbackList<void(void)> default_zoom_changed_callbacks_; |
| 70 |
| 71 DISALLOW_COPY_AND_ASSIGN(ChromeZoomLevelPrefs); |
| 72 }; |
| 73 |
| 74 } // namespace chrome |
| 75 |
| 76 #endif // CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_ |
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