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| 1 // Copyright (c) 2009 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 // Maps hostnames to custom zoom levels. Written on the UI thread and read on |
| 6 // the IO thread. One instance per profile. |
| 7 |
| 8 #ifndef CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
| 9 #define CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
| 10 |
| 11 #include <map> |
| 12 #include <string> |
| 13 |
| 14 #include "base/basictypes.h" |
| 15 #include "base/lock.h" |
| 16 #include "base/ref_counted.h" |
| 17 |
| 18 class PrefService; |
| 19 class Profile; |
| 20 |
| 21 class HostZoomMap : public base::RefCountedThreadSafe<HostZoomMap> { |
| 22 public: |
| 23 explicit HostZoomMap(Profile* profile); |
| 24 |
| 25 static void RegisterUserPrefs(PrefService* prefs); |
| 26 |
| 27 // Returns the zoom level for a given hostname. In most cases, there is no |
| 28 // custom zoom level, and this returns 0. Otherwise, returns the saved zoom |
| 29 // level, which may be positive (to zoom in) or negative (to zoom out). |
| 30 // |
| 31 // This may be called on any thread. |
| 32 int GetZoomLevel(const std::string& host) const; |
| 33 |
| 34 // Sets the zoom level for a given hostname to |level|. If the level is 0, |
| 35 // the host is erased from the saved preferences; otherwise the new value is |
| 36 // written out. |
| 37 // |
| 38 // This should only be called on the UI thread. |
| 39 void SetZoomLevel(const std::string& host, int level); |
| 40 |
| 41 private: |
| 42 friend class base::RefCountedThreadSafe<HostZoomMap>; |
| 43 |
| 44 typedef std::map<std::string, int> HostZoomLevels; |
| 45 |
| 46 ~HostZoomMap(); |
| 47 |
| 48 // The profile we're associated with. |
| 49 Profile* profile_; |
| 50 |
| 51 // Copy of the pref data, so that we can read it on the IO thread. |
| 52 HostZoomLevels host_zoom_levels_; |
| 53 |
| 54 // Used around accesses to |host_zoom_levels_| to guarantee thread safety. |
| 55 mutable Lock lock_; |
| 56 |
| 57 DISALLOW_COPY_AND_ASSIGN(HostZoomMap); |
| 58 }; |
| 59 |
| 60 #endif // CHROME_BROWSER_HOST_ZOOM_MAP_H_ |
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