src/content/browser/host_zoom_map_impl.h

   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 class WebContentsImpl;
  23
  24 // HostZoomMap needs to be deleted on the UI thread because it listens
  25 // to notifications on there (and holds a NotificationRegistrar).
  26 class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
  27                                        public NotificationObserver,
  28                                        public base::SupportsUserData::Data {
  29  public:
  30   HostZoomMapImpl();
  31   ~HostZoomMapImpl() override;
  32
  33   // HostZoomMap implementation:
  34   void CopyFrom(HostZoomMap* copy) override;
  35   double GetZoomLevelForHostAndScheme(const std::string& scheme,
  36                                       const std::string& host) const override;
  37   // TODO(wjmaclean) Should we use a GURL here? crbug.com/384486
  38   bool HasZoomLevel(const std::string& scheme,
  39                     const std::string& host) const override;
  40   ZoomLevelVector GetAllZoomLevels() const override;
  41   void SetZoomLevelForHost(const std::string& host, double level) override;
  42   void SetZoomLevelForHostAndScheme(const std::string& scheme,
  43                                     const std::string& host,
  44                                     double level) override;
  45   bool UsesTemporaryZoomLevel(int render_process_id,
  46                               int render_view_id) const override;
  47   void SetTemporaryZoomLevel(int render_process_id,
  48                              int render_view_id,
  49                              double level) override;
  50
  51   void ClearTemporaryZoomLevel(int render_process_id,
  52                                int render_view_id) override;
  53   double GetDefaultZoomLevel() const override;
  54   void SetDefaultZoomLevel(double level) override;
  55   scoped_ptr<Subscription> AddZoomLevelChangedCallback(
  56       const ZoomLevelChangedCallback& callback) override;
  57
  58   // Returns the current zoom level for the specified WebContents. This may
  59   // be a temporary zoom level, depending on UsesTemporaryZoomLevel().
  60   double GetZoomLevelForWebContents(
  61       const WebContentsImpl& web_contents_impl) const;
  62
  63   // Sets the zoom level for this WebContents. If this WebContents is using
  64   // a temporary zoom level, then level is only applied to this WebContents.
  65   // Otherwise, the level will be applied on a host level.
  66   void SetZoomLevelForWebContents(const WebContentsImpl& web_contents_impl,
  67                                   double level);
  68
  69   // Sets the zoom level for the specified view. The level may be set for only
  70   // this view, or for the host, depending on UsesTemporaryZoomLevel().
  71   void SetZoomLevelForView(int render_process_id,
  72                            int render_view_id,
  73                            double level,
  74                            const std::string& host);
  75
  76   // Returns the temporary zoom level that's only valid for the lifetime of
  77   // the given WebContents (i.e. isn't saved and doesn't affect other
  78   // WebContentses) if it exists, the default zoom level otherwise.
  79   //
  80   // This may be called on any thread.
  81   double GetTemporaryZoomLevel(int render_process_id,
  82                                int render_view_id) const;
  83
  84   // NotificationObserver implementation.
  85   void Observe(int type,
  86                const NotificationSource& source,
  87                const NotificationDetails& details) override;
  88
  89   void SendErrorPageZoomLevelRefresh();
  90
  91  private:
  92   typedef std::map<std::string, double> HostZoomLevels;
  93   typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;
  94
  95   struct RenderViewKey {
  96     int render_process_id;
  97     int render_view_id;
  98     RenderViewKey(int render_process_id, int render_view_id)
  99         : render_process_id(render_process_id),
 100           render_view_id(render_view_id) {}
 101     bool operator<(const RenderViewKey& other) const {
 102       return render_process_id < other.render_process_id ||
 103              ((render_process_id == other.render_process_id) &&
 104               (render_view_id < other.render_view_id));
 105     }
 106   };
 107
 108   typedef std::map<RenderViewKey, double> TemporaryZoomLevels;
 109
 110   double GetZoomLevelForHost(const std::string& host) const;
 111
 112   // Notifies the renderers from this browser context to change the zoom level
 113   // for the specified host and scheme.
 114   // TODO(wjmaclean) Should we use a GURL here? crbug.com/384486
 115   void SendZoomLevelChange(const std::string& scheme,
 116                            const std::string& host,
 117                            double level);
 118
 119   // Callbacks called when zoom level changes.
 120   base::CallbackList<void(const ZoomLevelChange&)>
 121       zoom_level_changed_callbacks_;
 122
 123   // Copy of the pref data, so that we can read it on the IO thread.
 124   HostZoomLevels host_zoom_levels_;
 125   SchemeHostZoomLevels scheme_host_zoom_levels_;
 126   double default_zoom_level_;
 127
 128   // Don't expect more than a couple of tabs that are using a temporary zoom
 129   // level, so vector is fine for now.
 130   TemporaryZoomLevels temporary_zoom_levels_;
 131
 132   // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
 133   // |temporary_zoom_levels_| to guarantee thread safety.
 134   mutable base::Lock lock_;
 135
 136   NotificationRegistrar registrar_;
 137
 138   DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl);
 139 };
 140
 141 }  // namespace content
 142
 143 #endif  // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_