Zoom Extension API

chrome/browser/ui/zoom/zoom_controller.h

 // Copyright (c) 2012 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_CONTROLLER_H_
 #define CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/prefs/pref_member.h"
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
+#include "extensions/common/extension.h"
 
 class ZoomObserver;
 
 namespace content {
 class WebContents;
 }
 
 // Per-tab class to manage the Omnibox zoom icon.
 class ZoomController : public content::WebContentsObserver,
                        public content::WebContentsUserData<ZoomController> {
  public:
   virtual ~ZoomController();
 
   int zoom_percent() const { return zoom_percent_; }
 
   // Convenience method to quickly check if the tab's at default zoom.
   bool IsAtDefaultZoom() const;
 
   // Returns which image should be loaded for the current zoom level.
   int GetResourceForZoomLevel() const;
 
+  const extensions::Extension* last_extension() const;
+
   void set_observer(ZoomObserver* observer) { observer_ = observer; }
 
+  // Sets the zoom level through WebContents::SetZoomLevel(). Returns a boolean
+  // flag indicating success (true) or failure (false).
+  bool SetZoomLevelByExtension(
+      double zoom_level,
+      scoped_refptr<const extensions::Extension> extension,
+      const base::Callback<void(void)>& callback);
+
   // content::WebContentsObserver overrides:
   virtual void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) OVERRIDE;
 
  private:
   explicit ZoomController(content::WebContents* web_contents);
   friend class content::WebContentsUserData<ZoomController>;
   friend class ZoomControllerTest;
 
   void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change);
 
   // Updates the zoom icon and zoom percentage based on current values and
   // notifies the observer if changes have occurred. |host| may be empty,
   // meaning the change should apply to ~all sites. If it is not empty, the
   // change only affects sites with the given host.
   void UpdateState(const std::string& host);
+  void UpdateState(const std::string& host, bool is_temporary_zoom);
+
+  // This function serves as a callback that will be called after a zoom
+  // change has completed that is initiated from SetZoomLevelByExtension().
+  void ZoomCallback(scoped_refptr<const extensions::Extension> extension,
+                    const base::Callback<void(void)>& callback);
 
   // The current zoom percentage.
   int zoom_percent_;
 
   // Used to access the default zoom level preference.
   DoublePrefMember default_zoom_level_;
 
+  // Keeps track of the extension (if any) that initiated the last zoom change
+  // that took effect.
+  scoped_refptr<const extensions::Extension> last_extension_;
+
+  // Temporary buffer that stores the extension (if any) that initiated the zoom
+  // change that the ZoomController is about to be notified about.
+  scoped_refptr<const extensions::Extension> pending_extension_;
+
   // Observer receiving notifications on state changes.
   ZoomObserver* observer_;
 
   content::BrowserContext* browser_context_;
 
   scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomController);
 };
 
 #endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_