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// 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_;
content::HostZoomMap::ZoomLevelChangedCallback zoom_callback_;
DISALLOW_COPY_AND_ASSIGN(ZoomController);
};
#endif // CHROME_BROWSER_UI_ZOOM_ZOOM_CONTROLLER_H_
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