Move ZoomObserver, ZoomController and ZoomEventManager to components/.

components/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_
+#ifndef COMPONENTS_UI_ZOOM_ZOOM_CONTROLLER_H_
+#define COMPONENTS_UI_ZOOM_ZOOM_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.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"
 
-class ZoomObserver;
+class ZoomControllerTest;
 
 namespace content {
 class WebContents;
 }
 
-namespace extensions {
-class Extension;
-}  // namespace extensions
+namespace ui_zoom {
+class ZoomObserver;
+
+class ZoomRequestClient : public base::RefCounted<ZoomRequestClient> {
+ public:
+  ZoomRequestClient() {}
+
+ protected:
+  virtual ~ZoomRequestClient() {}
+
+ private:
+  friend class base::RefCounted<ZoomRequestClient>;
+
+  DISALLOW_COPY_AND_ASSIGN(ZoomRequestClient);
+};
 
 // Per-tab class to manage zoom changes and the Omnibox zoom icon.
 class ZoomController : public content::WebContentsObserver,
                        public content::WebContentsUserData<ZoomController> {
  public:
   // Defines how zoom changes are handled.
   enum ZoomMode {
     // Results in default zoom behavior, i.e. zoom changes are handled
     // automatically and on a per-origin basis, meaning that other tabs
     // navigated to the same origin will also zoom.
     ZOOM_MODE_DEFAULT,
     // Results in zoom changes being handled automatically, but on a per-tab
     // basis. Tabs in this zoom mode will not be affected by zoom changes in
     // other tabs, and vice versa.
     ZOOM_MODE_ISOLATED,
     // Overrides the automatic handling of zoom changes. The |onZoomChange|
     // event will still be dispatched, but the page will not actually be zoomed.
     // These zoom changes can be handled manually by listening for the
     // |onZoomChange| event. Zooming in this mode is also on a per-tab basis.
     ZOOM_MODE_MANUAL,
     // Disables all zooming in this tab. The tab will revert to default (100%)
     // zoom, and all attempted zoom changes will be ignored.
     ZOOM_MODE_DISABLED,
   };
 
+  enum RelativeZoom {
+    ZOOM_BELOW_DEFAULT_ZOOM,
+    ZOOM_AT_DEFAULT_ZOOM,
+    ZOOM_ABOVE_DEFAULT_ZOOM
+  };
+
   struct ZoomChangedEventData {
     ZoomChangedEventData(content::WebContents* web_contents,
                          double old_zoom_level,
                          double new_zoom_level,
                          ZoomController::ZoomMode zoom_mode,
                          bool can_show_bubble)
         : web_contents(web_contents),
           old_zoom_level(old_zoom_level),
           new_zoom_level(new_zoom_level),
           zoom_mode(zoom_mode),
@@ skipping 13 matching lines @@
   // inlining.
   double GetDefaultZoomLevel() const {
     return content::HostZoomMap::GetForWebContents(web_contents())
         ->GetDefaultZoomLevel();
   }
 
   // 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;
+  RelativeZoom GetZoomRelativeToDefault() const;
 
-  const extensions::Extension* last_extension() const {
-    return last_extension_.get();
-  }
+  const ZoomRequestClient* last_client() const { return last_client_.get(); }
 
   void AddObserver(ZoomObserver* observer);
   void RemoveObserver(ZoomObserver* observer);
 
   // Used to set whether the zoom notification bubble can be shown when the
   // zoom level is changed for this controller. Default behavior is to show
   // the bubble.
   void SetShowsNotificationBubble(bool can_show_bubble) {
     can_show_bubble_ = can_show_bubble;
   }
 
   // Gets the current zoom level by querying HostZoomMap (if not in manual zoom
   // mode) or from the ZoomController local value otherwise.
   double GetZoomLevel() const;
   // Calls GetZoomLevel() then converts the returned value to a percentage
   // zoom factor.
   // Virtual for testing.
   virtual int GetZoomPercent() const;
 
   // Sets the zoom level through HostZoomMap.
   // Returns true on success.
   bool SetZoomLevel(double zoom_level);
 
   // Sets the zoom level via HostZoomMap (or stores it locally if in manual zoom
-  // mode), and attributes the zoom to |extension|. Returns true on success.
-  bool SetZoomLevelByExtension(
+  // mode), and attributes the zoom to |client|. Returns true on success.
+  bool SetZoomLevelByClient(
       double zoom_level,
-      const scoped_refptr<const extensions::Extension>& extension);
+      const scoped_refptr<const ZoomRequestClient>& client);
 
   // Sets the zoom mode, which defines zoom behavior (see enum ZoomMode).
   void SetZoomMode(ZoomMode zoom_mode);
 
   // content::WebContentsObserver overrides:
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
   void WebContentsDestroyed() override;
 
  protected:
   // Protected for testing.
   explicit ZoomController(content::WebContents* web_contents);
 
  private:
   friend class content::WebContentsUserData<ZoomController>;
-  friend class ZoomControllerTest;
+  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);
 
   // True if changes to zoom level can trigger the zoom notification bubble.
   bool can_show_bubble_;
 
   // The current zoom mode.
   ZoomMode zoom_mode_;
 
   // Current zoom level.
   double zoom_level_;
 
   scoped_ptr<ZoomChangedEventData> event_data_;
 
   // Keeps track of the extension (if any) that initiated the last zoom change
   // that took effect.
-  scoped_refptr<const extensions::Extension> last_extension_;
+  scoped_refptr<const ZoomRequestClient> last_client_;
 
   // Observer receiving notifications on state changes.
   ObserverList<ZoomObserver> observers_;
 
   content::BrowserContext* browser_context_;
 
   scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomController);
 };
 
-#endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_
+}  // namespace ui_zoom
+
+#endif  // COMPONENTS_UI_ZOOM_ZOOM_CONTROLLER_H_