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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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 #ifndef CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ | 5 #ifndef CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ |
6 #define CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ | 6 #define CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ |
7 | 7 |
| 8 #include <queue> |
| 9 |
8 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
9 #include "base/compiler_specific.h" | 11 #include "base/compiler_specific.h" |
10 #include "base/prefs/pref_member.h" | 12 #include "base/prefs/pref_member.h" |
11 #include "content/public/browser/host_zoom_map.h" | 13 #include "content/public/browser/host_zoom_map.h" |
12 #include "content/public/browser/web_contents_observer.h" | 14 #include "content/public/browser/web_contents_observer.h" |
13 #include "content/public/browser/web_contents_user_data.h" | 15 #include "content/public/browser/web_contents_user_data.h" |
| 16 #include "extensions/common/extension.h" |
14 | 17 |
15 class ZoomObserver; | 18 class ZoomObserver; |
16 | 19 |
17 namespace content { | 20 namespace content { |
18 class WebContents; | 21 class WebContents; |
19 } | 22 } |
20 | 23 |
21 // Per-tab class to manage the Omnibox zoom icon. | 24 // Defines how zoom changes are handled. |
| 25 // |kZoomModeDefault| results in default zoom behavior, i.e. zoom changes are |
| 26 // handled automatically and on a per-origin basis, meaning that other |
| 27 // tabs navigated to the same origin will also zoom. |
| 28 // |kZoomModeIsolated| results in zoom changes being handled automatically, |
| 29 // but on a per-tab basis. Tabs in this zoom mode will not be affected by |
| 30 // zoom changes in other tabs, and vice versa. |
| 31 // |kZoomModeManual| overrides the automatic handling of zoom changes. The |
| 32 // |onZoomChange| event will still be dispatched, but the page will not |
| 33 // actually be zoomed. These zoom changes can be handled manually by |
| 34 // listening for the |onZoomChange| event. Zooming in this mode is also on |
| 35 // a per-tab basis. |
| 36 // |kZoomModeDisabled| disables all zooming in this tab. The tab will revert |
| 37 // to default (100%) zoom, and all attempted zoom changes will be ignored. |
| 38 enum ZoomMode { |
| 39 kZoomModeDefault, |
| 40 kZoomModeIsolated, |
| 41 kZoomModeManual, |
| 42 kZoomModeDisabled, |
| 43 }; |
| 44 |
| 45 // Per-tab class to manage zoom changes and the Omnibox zoom icon. |
22 class ZoomController : public content::WebContentsObserver, | 46 class ZoomController : public content::WebContentsObserver, |
23 public content::WebContentsUserData<ZoomController> { | 47 public content::WebContentsUserData<ZoomController> { |
24 public: | 48 public: |
25 virtual ~ZoomController(); | 49 virtual ~ZoomController(); |
26 | 50 |
27 int zoom_percent() const { return zoom_percent_; } | 51 ZoomMode zoom_mode() const { return zoom_mode_; } |
28 | 52 |
29 // Convenience method to quickly check if the tab's at default zoom. | 53 // Convenience method to quickly check if the tab's at default zoom. |
30 bool IsAtDefaultZoom() const; | 54 bool IsAtDefaultZoom() const; |
31 | 55 |
32 // Returns which image should be loaded for the current zoom level. | 56 // Returns which image should be loaded for the current zoom level. |
33 int GetResourceForZoomLevel() const; | 57 int GetResourceForZoomLevel() const; |
34 | 58 |
| 59 const extensions::Extension* last_extension() const; |
| 60 |
35 void set_observer(ZoomObserver* observer) { observer_ = observer; } | 61 void set_observer(ZoomObserver* observer) { observer_ = observer; } |
36 | 62 |
| 63 double GetZoomLevel() const; |
| 64 int GetZoomPercent() const; |
| 65 |
| 66 // Sets the zoom level through HostZoomMap. |
| 67 // Returns a boolean flag indicating success (true) or failure (false). |
| 68 bool SetZoomLevel(double zoom_level); |
| 69 |
| 70 // Sets the zoom level through WebContents::SetZoomLevel(), and attributes the |
| 71 // zoom to |extension|. Returns a boolean flag indicating success (true) or |
| 72 // failure (false). |
| 73 bool SetZoomLevelByExtension( |
| 74 double zoom_level, |
| 75 scoped_refptr<const extensions::Extension> extension); |
| 76 |
| 77 // Sets the zoom mode, which defines zoom behavior (see enum ZoomMode). |
| 78 void SetZoomMode(ZoomMode zoom_mode); |
| 79 |
37 // content::WebContentsObserver overrides: | 80 // content::WebContentsObserver overrides: |
38 virtual void DidNavigateMainFrame( | 81 virtual void DidNavigateMainFrame( |
39 const content::LoadCommittedDetails& details, | 82 const content::LoadCommittedDetails& details, |
40 const content::FrameNavigateParams& params) OVERRIDE; | 83 const content::FrameNavigateParams& params) OVERRIDE; |
41 | 84 |
42 private: | 85 private: |
43 explicit ZoomController(content::WebContents* web_contents); | 86 explicit ZoomController(content::WebContents* web_contents); |
44 friend class content::WebContentsUserData<ZoomController>; | 87 friend class content::WebContentsUserData<ZoomController>; |
45 friend class ZoomControllerTest; | 88 friend class ZoomControllerTest; |
46 | 89 |
47 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); | 90 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); |
48 | 91 |
49 // Updates the zoom icon and zoom percentage based on current values and | 92 // Updates the zoom icon and zoom percentage based on current values and |
50 // notifies the observer if changes have occurred. |host| may be empty, | 93 // notifies the observer if changes have occurred. |host| may be empty, |
51 // meaning the change should apply to ~all sites. If it is not empty, the | 94 // meaning the change should apply to ~all sites. If it is not empty, the |
52 // change only affects sites with the given host. | 95 // change only affects sites with the given host. |
53 void UpdateState(const std::string& host); | 96 void UpdateState(const std::string& host); |
| 97 void UpdateState(const std::string& host, bool is_temporary_zoom); |
54 | 98 |
55 // The current zoom percentage. | 99 // This function serves as a callback that will be called after a zoom |
56 int zoom_percent_; | 100 // change has completed that is initiated from SetZoomLevelByExtension(). |
| 101 void ZoomCallback(scoped_refptr<const extensions::Extension> extension, |
| 102 const base::Callback<void(void)>& callback); |
| 103 |
| 104 // The current zoom mode. |
| 105 ZoomMode zoom_mode_; |
| 106 |
| 107 // Current zoom level. |
| 108 double zoom_level_; |
57 | 109 |
58 // Used to access the default zoom level preference. | 110 // Used to access the default zoom level preference. |
59 DoublePrefMember default_zoom_level_; | 111 DoublePrefMember default_zoom_level_; |
60 | 112 |
| 113 // Keeps track of the extension (if any) that initiated the last zoom change |
| 114 // that took effect. |
| 115 scoped_refptr<const extensions::Extension> last_extension_; |
| 116 |
61 // Observer receiving notifications on state changes. | 117 // Observer receiving notifications on state changes. |
62 ZoomObserver* observer_; | 118 ZoomObserver* observer_; |
63 | 119 |
64 content::BrowserContext* browser_context_; | 120 content::BrowserContext* browser_context_; |
65 | 121 |
66 scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_; | 122 scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_; |
67 | 123 |
| 124 // Keeps track of extensions that initiated zoom changes so that they can be |
| 125 // attributed when the zoom changes complete. |
| 126 std::queue<scoped_refptr<const extensions::Extension> > extensions_; |
| 127 |
68 DISALLOW_COPY_AND_ASSIGN(ZoomController); | 128 DISALLOW_COPY_AND_ASSIGN(ZoomController); |
69 }; | 129 }; |
70 | 130 |
71 #endif // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ | 131 #endif // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ |
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