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).
NON_EXPORTED_BASE(HostZoomMap)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 scoped_ptr<Subscription> AddZoomLevelChangedCallback(
46 const ZoomLevelChangedCallback& callback) OVERRIDE;
47
48 // Returns the temporary zoom level that's only valid for the lifetime of
49 // the given WebContents (i.e. isn't saved and doesn't affect other
50 // WebContentses) if it exists, the default zoom level otherwise.
51 //
52 // This may be called on any thread.
53 double GetTemporaryZoomLevel(int render_process_id,
54 int render_view_id) const;
55
56 // Sets the temporary zoom level that's only valid for the lifetime of this
57 // WebContents.
58 //
59 // This should only be called on the UI thread.
60 void SetTemporaryZoomLevel(int render_process_id,
61 int render_view_id,
62 double level);
63
64 // NotificationObserver implementation.
65 virtual void Observe(int type,
66 const NotificationSource& source,
67 const NotificationDetails& details) OVERRIDE;
68
69 private:
70 double GetZoomLevelForHost(const std::string& host) const;
71
72 typedef std::map<std::string, double> HostZoomLevels;
73 typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;
74
75 // Callbacks called when zoom level changes.
76 base::CallbackList<void(const ZoomLevelChange&)>
77 zoom_level_changed_callbacks_;
78
79 // Copy of the pref data, so that we can read it on the IO thread.
80 HostZoomLevels host_zoom_levels_;
81 SchemeHostZoomLevels scheme_host_zoom_levels_;
82 double default_zoom_level_;
83
84 struct TemporaryZoomLevel {
85 int render_process_id;
86 int render_view_id;
87 double zoom_level;
88 };
89
90 // Don't expect more than a couple of tabs that are using a temporary zoom
91 // level, so vector is fine for now.
92 std::vector<TemporaryZoomLevel> temporary_zoom_levels_;
93
94 // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
95 // |temporary_zoom_levels_| to guarantee thread safety.
96 mutable base::Lock lock_;
97
98 NotificationRegistrar registrar_;
99
100 DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl);
101 };
102
103 } // namespace content
104
105 #endif // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
106