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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 { |
| 20 public: |
| 21 ZoomEventManager(); |
| 22 virtual ~ZoomEventManager(); |
| 23 |
| 24 // Returns the ZoomEventManager for the specified BrowserContext. This |
| 25 // function creates the ZoomEventManager if it hasn't been created already. |
| 26 static ZoomEventManager* GetForBrowserContext( |
| 27 content::BrowserContext* context); |
| 28 |
| 29 // Called by ZoomControllers when changes are made to zoom levels in manual |
| 30 // mode in order that browser listeners can be notified. |
| 31 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); |
| 32 |
| 33 // Add and remove zoom level changed callbacks. |
| 34 scoped_ptr<content::HostZoomMap::Subscription> AddZoomLevelChangedCallback( |
| 35 const content::HostZoomMap::ZoomLevelChangedCallback& callback); |
| 36 |
| 37 private: |
| 38 base::CallbackList<void(const content::HostZoomMap::ZoomLevelChange&)> |
| 39 zoom_level_changed_callbacks_; |
| 40 |
| 41 DISALLOW_COPY_AND_ASSIGN(ZoomEventManager); |
| 42 }; |
| 43 |
| 44 #endif // CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ |
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