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1 // Copyright 2014 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 CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ | |
6 #define CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ | |
7 | |
8 #include "base/callback_list.h" | |
9 #include "base/supports_user_data.h" | |
10 #include "content/public/browser/host_zoom_map.h" | |
11 | |
12 namespace content { | |
13 class BrowserContext; | |
14 } // namespace content | |
15 | |
16 // This class serves as a target for event notifications from all ZoomController | |
17 // objects. Classes that need to know about browser-specific zoom events (e.g. | |
18 // manual-mode zoom) should subscribe here. | |
19 class ZoomEventManager : public base::SupportsUserData::Data { | |
Dan Beam
2014/06/26 03:40:03
why do both ZoomEventManager and ZoomObserver need
wjmaclean
2014/06/26 15:30:31
Observers (such as the wrench menu) need a single
| |
20 public: | |
21 ZoomEventManager(); | |
22 virtual ~ZoomEventManager(); | |
23 | |
24 static ZoomEventManager* GetForBrowserContext( | |
25 content::BrowserContext* context); | |
26 | |
27 // Called by ZoomControllers when changes are made to zoom levels in manual | |
28 // mode in order that browser listeners can be notified. | |
29 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); | |
30 | |
31 // Add and remove zoom level changed callbacks. | |
32 scoped_ptr<content::HostZoomMap::Subscription> AddZoomLevelChangedCallback( | |
33 const content::HostZoomMap::ZoomLevelChangedCallback& callback); | |
34 | |
35 private: | |
36 base::CallbackList<void(const content::HostZoomMap::ZoomLevelChange&)> | |
37 zoom_level_changed_callbacks_; | |
38 | |
39 DISALLOW_COPY_AND_ASSIGN(ZoomEventManager); | |
40 }; | |
41 | |
42 #endif // CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ | |
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