/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   Implements pinch functionality

*

*/

#ifndef WEBPAGEPINCHZOOMHANDLER_H

#define WEBPAGEPINCHZOOMHANDLER_H

//  INCLUDES

#include <e32base.h>

#include <coedef.h>

#include <w32std.h>

#include <stmgestureinterface.h>

// MACROS

// FORWARD DECLARATIONS

class WebView;

// CLASS DECLARATION

class WebPagePinchZoomHandler: public CBase {

public:  // Constructor and destructor

    /**

     * Two-phased constructor.

     **/

    static WebPagePinchZoomHandler* NewL(WebView* webView);

    /**

     * Destructor.

     **/

    virtual ~WebPagePinchZoomHandler();

private:  // Constructors

    /**

     * C++ default constructor.

     **/

    WebPagePinchZoomHandler(WebView* webView);

    /**

     * By default Symbian 2nd phase constructor is private.

     **/

    void constructL();

public: // New functions

    /**

     * Handler for Pinch event

     **/

    void handlePinchGestureEventL(const TStmGestureEvent& aGesture);

    /**

     * Handler for PinchEnter event

     **/

    void handlePinchGestureL(const TStmGestureEvent& aGesture);

    /**

     * Handler for PinchExit event

     **/

    void handlePinchGestureExitL(const TStmGestureEvent& aGesture);

    /**

     * to set the zoom level for bitmap zooming

     **/

    void setZoomLevelL(TInt zoomLevel);

    /**

     * to update the bitmap

     **/

    void updateBitmap();

    /**

     * to get the pinch step size corresponding to a pinch gesture

     **/

    TInt getPinchZoomStepSize();

    /**

     * to query whether pinch is active: 

     * pinch is active once GestureEnter for pinch is received. And it is active until the pinch expiry timer gets expired 

     **/

    TBool isPinchActive();

    /**

     * handler for pinch exit timer expiry

     **/

    void handlepinchExitWaitTimer();

    /**

     * To get the pinch center

     **/

    TPoint pinchCenter() {return m_pinchCenter;};

private:   

    WebView*         m_webView;            // <<not owned>>

    CPeriodic*       m_bitmapUpdateTimer;  // <<owned>> 

    CPeriodic*       m_pinchExitWaitTimer; // <<owned>> 

    TInt             m_pinchFactor;

    int              m_zoomOutBaseLevel;

    bool             m_pinchCenterSet;

    TInt             m_zoomStepSize;

    bool             m_pinchActive;

    TPoint           m_pinchCenter;

};

#endif      //WEBPAGEPINCHZOOMHANDLER_H

// End of File