| // 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" |
| |
| 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; |
| |
| void set_observer(ZoomObserver* observer) { observer_ = observer; } |
| |
| // 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); |
| |
| // The current zoom percentage. |
| int zoom_percent_; |
| |
| // Used to access the default zoom level preference. |
| DoublePrefMember default_zoom_level_; |
| |
| // 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_ |