1 // Copyright (c) 2012 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_CONTROLLER_H_ 6 #define CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/compiler_specific.h" 10 #include "base/prefs/pref_member.h" 11 #include "content/public/browser/host_zoom_map.h" 12 #include "content/public/browser/web_contents_observer.h" 13 #include "content/public/browser/web_contents_user_data.h" 14 15 class ZoomObserver; 16 17 namespace content { 18 class WebContents; 19 } 20 21 // Per-tab class to manage the Omnibox zoom icon. 22 class ZoomController : public content::WebContentsObserver, 23 public content::WebContentsUserData<ZoomController> { 24 public: 25 virtual ~ZoomController(); 26 zoom_percent()27 int zoom_percent() const { return zoom_percent_; } 28 29 // Convenience method to quickly check if the tab's at default zoom. 30 bool IsAtDefaultZoom() const; 31 32 // Returns which image should be loaded for the current zoom level. 33 int GetResourceForZoomLevel() const; 34 set_observer(ZoomObserver * observer)35 void set_observer(ZoomObserver* observer) { observer_ = observer; } 36 37 // content::WebContentsObserver overrides: 38 virtual void DidNavigateMainFrame( 39 const content::LoadCommittedDetails& details, 40 const content::FrameNavigateParams& params) OVERRIDE; 41 42 private: 43 explicit ZoomController(content::WebContents* web_contents); 44 friend class content::WebContentsUserData<ZoomController>; 45 friend class ZoomControllerTest; 46 47 void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change); 48 49 // Updates the zoom icon and zoom percentage based on current values and 50 // notifies the observer if changes have occurred. |host| may be empty, 51 // meaning the change should apply to ~all sites. If it is not empty, the 52 // change only affects sites with the given host. 53 void UpdateState(const std::string& host); 54 55 // The current zoom percentage. 56 int zoom_percent_; 57 58 // Used to access the default zoom level preference. 59 DoublePrefMember default_zoom_level_; 60 61 // Observer receiving notifications on state changes. 62 ZoomObserver* observer_; 63 64 content::BrowserContext* browser_context_; 65 66 scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_; 67 68 DISALLOW_COPY_AND_ASSIGN(ZoomController); 69 }; 70 71 #endif // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_ 72