Index: chrome/browser/ui/zoom/zoom_event_manager.h |
diff --git a/chrome/browser/ui/zoom/zoom_event_manager.h b/chrome/browser/ui/zoom/zoom_event_manager.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..306ce0b7471d47f6ea7bb62007d820ceb344084f |
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+++ b/chrome/browser/ui/zoom/zoom_event_manager.h |
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+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ |
+#define CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ |
+ |
+#include "base/callback_list.h" |
+#include "base/supports_user_data.h" |
+#include "content/public/browser/host_zoom_map.h" |
+ |
+namespace content { |
+class BrowserContext; |
+} // namespace content |
+ |
+// This class serves as a target for event notifications from all ZoomController |
+// objects. Classes that need to know about browser-specific zoom events (e.g. |
+// manual-mode zoom) should subscribe here. |
+class ZoomEventManager : public base::SupportsUserData::Data { |
+ public: |
+ ZoomEventManager(); |
+ virtual ~ZoomEventManager(); |
+ |
+ // Returns the ZoomEventManager for the specified BrowserContext. This |
+ // function creates the ZoomEventManager if it hasn't been created already. |
+ static ZoomEventManager* GetForBrowserContext( |
+ content::BrowserContext* context); |
+ |
+ // Called by ZoomControllers when changes are made to zoom levels in manual |
+ // mode in order that browser listeners can be notified. |
+ void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); |
+ |
+ // Add and remove zoom level changed callbacks. |
+ scoped_ptr<content::HostZoomMap::Subscription> AddZoomLevelChangedCallback( |
+ const content::HostZoomMap::ZoomLevelChangedCallback& callback); |
+ |
+ private: |
+ base::CallbackList<void(const content::HostZoomMap::ZoomLevelChange&)> |
+ zoom_level_changed_callbacks_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(ZoomEventManager); |
+}; |
+ |
+#endif // CHROME_BROWSER_UI_ZOOM_ZOOM_EVENT_MANAGER_H_ |