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 CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_ 6 #define CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_ 7 8 #include <map> 9 #include <string> 10 #include <vector> 11 12 #include "base/compiler_specific.h" 13 #include "base/sequenced_task_runner_helpers.h" 14 #include "base/supports_user_data.h" 15 #include "base/synchronization/lock.h" 16 #include "content/public/browser/host_zoom_map.h" 17 #include "content/public/browser/notification_observer.h" 18 #include "content/public/browser/notification_registrar.h" 19 20 namespace content { 21 22 // HostZoomMap needs to be deleted on the UI thread because it listens 23 // to notifications on there (and holds a NotificationRegistrar). 24 class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap), 25 public NotificationObserver, 26 public base::SupportsUserData::Data { 27 public: 28 HostZoomMapImpl(); 29 virtual ~HostZoomMapImpl(); 30 31 // HostZoomMap implementation: 32 virtual void CopyFrom(HostZoomMap* copy) OVERRIDE; 33 virtual double GetZoomLevelForHostAndScheme( 34 const std::string& scheme, 35 const std::string& host) const OVERRIDE; 36 virtual void SetZoomLevelForHost( 37 const std::string& host, 38 double level) OVERRIDE; 39 virtual void SetZoomLevelForHostAndScheme( 40 const std::string& scheme, 41 const std::string& host, 42 double level) OVERRIDE; 43 virtual double GetDefaultZoomLevel() const OVERRIDE; 44 virtual void SetDefaultZoomLevel(double level) OVERRIDE; 45 virtual void AddZoomLevelChangedCallback( 46 const ZoomLevelChangedCallback& callback) OVERRIDE; 47 virtual void RemoveZoomLevelChangedCallback( 48 const ZoomLevelChangedCallback& callback) OVERRIDE; 49 50 // Returns the temporary zoom level that's only valid for the lifetime of 51 // the given WebContents (i.e. isn't saved and doesn't affect other 52 // WebContentses) if it exists, the default zoom level otherwise. 53 // 54 // This may be called on any thread. 55 double GetTemporaryZoomLevel(int render_process_id, 56 int render_view_id) const; 57 58 // Sets the temporary zoom level that's only valid for the lifetime of this 59 // WebContents. 60 // 61 // This should only be called on the UI thread. 62 void SetTemporaryZoomLevel(int render_process_id, 63 int render_view_id, 64 double level); 65 66 // NotificationObserver implementation. 67 virtual void Observe(int type, 68 const NotificationSource& source, 69 const NotificationDetails& details) OVERRIDE; 70 71 private: 72 double GetZoomLevelForHost(const std::string& host) const; 73 74 typedef std::map<std::string, double> HostZoomLevels; 75 typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels; 76 77 // Callbacks called when zoom level changes. 78 std::vector<ZoomLevelChangedCallback> zoom_level_changed_callbacks_; 79 80 // Copy of the pref data, so that we can read it on the IO thread. 81 HostZoomLevels host_zoom_levels_; 82 SchemeHostZoomLevels scheme_host_zoom_levels_; 83 double default_zoom_level_; 84 85 struct TemporaryZoomLevel { 86 int render_process_id; 87 int render_view_id; 88 double zoom_level; 89 }; 90 91 // Don't expect more than a couple of tabs that are using a temporary zoom 92 // level, so vector is fine for now. 93 std::vector<TemporaryZoomLevel> temporary_zoom_levels_; 94 95 // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and 96 // |temporary_zoom_levels_| to guarantee thread safety. 97 mutable base::Lock lock_; 98 99 NotificationRegistrar registrar_; 100 101 DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl); 102 }; 103 104 } // namespace content 105 106 #endif // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_ 107