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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // Maps hostnames to custom zoom levels. Written on the UI thread and read on | |
| 6 // any thread. One instance per profile. | |
| 7 | |
| 8 #ifndef CHROME_BROWSER_HOST_ZOOM_MAP_H_ | 5 #ifndef CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
| 9 #define CHROME_BROWSER_HOST_ZOOM_MAP_H_ | 6 #define CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
| 10 #pragma once | 7 #pragma once |
| 11 | 8 |
| 12 #include <map> | 9 // TODO(jam): remove this file when all files have been converted. |
| 13 #include <string> | 10 #include "content/browser/host_zoom_map.h" |
| 14 #include <vector> | |
| 15 | |
| 16 #include "base/basictypes.h" | |
| 17 #include "base/ref_counted.h" | |
| 18 #include "base/synchronization/lock.h" | |
| 19 #include "chrome/browser/browser_thread.h" | |
| 20 #include "chrome/browser/prefs/pref_change_registrar.h" | |
| 21 #include "chrome/common/notification_observer.h" | |
| 22 #include "chrome/common/notification_registrar.h" | |
| 23 | |
| 24 class GURL; | |
| 25 class PrefService; | |
| 26 class Profile; | |
| 27 | |
| 28 // HostZoomMap needs to be deleted on the UI thread because it listens | |
| 29 // to notifications on there (and holds a NotificationRegistrar). | |
| 30 class HostZoomMap : | |
| 31 public NotificationObserver, | |
| 32 public base::RefCountedThreadSafe<HostZoomMap, | |
| 33 BrowserThread::DeleteOnUIThread> { | |
| 34 public: | |
| 35 explicit HostZoomMap(Profile* profile); | |
| 36 | |
| 37 static void RegisterUserPrefs(PrefService* prefs); | |
| 38 | |
| 39 // Returns the zoom level for a given url. The zoom level is determined by | |
| 40 // the host portion of the URL, or (in the absence of a host) the complete | |
| 41 // spec of the URL. In most cases, there is no custom zoom level, and this | |
| 42 // returns the user's default zoom level. Otherwise, returns the saved zoom | |
| 43 // level, which may be positive (to zoom in) or negative (to zoom out). | |
| 44 // | |
| 45 // This may be called on any thread. | |
| 46 double GetZoomLevel(const GURL& url) const; | |
| 47 | |
| 48 // Sets the zoom level for a given url to |level|. If the level matches the | |
| 49 // current default zoom level, the host is erased from the saved preferences; | |
| 50 // otherwise the new value is written out. | |
| 51 // | |
| 52 // This should only be called on the UI thread. | |
| 53 void SetZoomLevel(const GURL& url, double level); | |
| 54 | |
| 55 // Returns the temporary zoom level that's only valid for the lifetime of | |
| 56 // the given tab (i.e. isn't saved and doesn't affect other tabs) if it | |
| 57 // exists, the default zoom level otherwise. | |
| 58 // | |
| 59 // This may be called on any thread. | |
| 60 double GetTemporaryZoomLevel(int render_process_id, | |
| 61 int render_view_id) const; | |
| 62 | |
| 63 // Sets the temporary zoom level that's only valid for the lifetime of this | |
| 64 // tab. | |
| 65 // | |
| 66 // This should only be called on the UI thread. | |
| 67 void SetTemporaryZoomLevel(int render_process_id, | |
| 68 int render_view_id, | |
| 69 double level); | |
| 70 | |
| 71 // Resets all zoom levels. | |
| 72 // | |
| 73 // This should only be called on the UI thread. | |
| 74 void ResetToDefaults(); | |
| 75 | |
| 76 // NotificationObserver implementation. | |
| 77 virtual void Observe(NotificationType type, | |
| 78 const NotificationSource& source, | |
| 79 const NotificationDetails& details); | |
| 80 | |
| 81 private: | |
| 82 friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>; | |
| 83 friend class DeleteTask<HostZoomMap>; | |
| 84 | |
| 85 typedef std::map<std::string, double> HostZoomLevels; | |
| 86 | |
| 87 ~HostZoomMap(); | |
| 88 | |
| 89 // Reads the zoom levels from the preferences service. | |
| 90 void Load(); | |
| 91 | |
| 92 // Removes dependencies on the profile so we can live longer than | |
| 93 // the profile without crashing. | |
| 94 void Shutdown(); | |
| 95 | |
| 96 // The profile we're associated with. | |
| 97 Profile* profile_; | |
| 98 | |
| 99 // Copy of the pref data, so that we can read it on the IO thread. | |
| 100 HostZoomLevels host_zoom_levels_; | |
| 101 double default_zoom_level_; | |
| 102 | |
| 103 struct TemporaryZoomLevel { | |
| 104 int render_process_id; | |
| 105 int render_view_id; | |
| 106 double zoom_level; | |
| 107 }; | |
| 108 | |
| 109 // Don't expect more than a couple of tabs that are using a temporary zoom | |
| 110 // level, so vector is fine for now. | |
| 111 std::vector<TemporaryZoomLevel> temporary_zoom_levels_; | |
| 112 | |
| 113 // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and | |
| 114 // |temporary_zoom_levels_| to guarantee thread safety. | |
| 115 mutable base::Lock lock_; | |
| 116 | |
| 117 // Whether we are currently updating preferences, this is used to ignore | |
| 118 // notifications from the preference service that we triggered ourself. | |
| 119 bool updating_preferences_; | |
| 120 | |
| 121 NotificationRegistrar registrar_; | |
| 122 PrefChangeRegistrar pref_change_registrar_; | |
| 123 | |
| 124 DISALLOW_COPY_AND_ASSIGN(HostZoomMap); | |
| 125 }; | |
| 126 | 11 |
| 127 #endif // CHROME_BROWSER_HOST_ZOOM_MAP_H_ | 12 #endif // CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
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