/*
* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "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:
*
*/
#ifndef QSTMZOOMGESTURERECOGNISER_H_
#define QSTMZOOMGESTURERECOGNISER_H_
#include <qstmgestureengine_if.h>
#include <qstmgesture_if.h>
#include <qstmgesturelistener_if.h>
namespace qstmGesture
{
/*!
* QStm_ZoomGestureRecogniser handles zoomin gesture: start from near lower left / upper right corner and drag
* This is useful if one wants to implement single handed zooming so can be done using thumb
* (no need to use pinch i.e. hold device in one hand and use two fingers of the other)
* Current spec is:
* - touch lower left corner and start dragging => initialize ZOOM IN
* - touch upper right corner and start dragging => initialize ZOOM OUT
* store the touch point and then calculate the distance until release
* The distance is the zoom factor (probably needs some adjustment, not just the pixels...)
*/
class QStm_ZoomGestureRecogniser : public QStm_GestureRecogniser
{
public:
static const QStm_GestureUid KUid = EGestureUidCornerZoom;
virtual ~QStm_ZoomGestureRecogniser();
virtual QStm_GestureRecognitionState recognise(int numOfActiveStreams, QStm_GestureEngineIf* ge) ;
virtual void release(QStm_GestureEngineIf* ge) ;
virtual QStm_GestureUid gestureUid() const { return KUid; }
/*!
* Additional methods to set up zoom in gesture recogniser:
* define the rectangle where the lower left corner is
* \param theArea
*/
void setArea(const QRect& theArea) ;
/*!
* Additional methods to set up zoom in gesture recogniser:
* Define how close to the lower left corner the touch must happen
* \param rangeInPixels
*/
void setRange(int rangeInMm) ;
QStm_ZoomGestureRecogniser(QStm_GestureListenerIf* listener) ;
float calculateDistance(const QPoint& aTp) ;
int adjustZoom(float& previousDistance, float newDistance) ;
private:
QRect m_area ;
int m_rangesizeInPixels ;
QStm_ZoomType m_zoomtype ;
bool m_zooming ;
QPoint m_startingtouch ;
QPoint m_previoustouch ;
int m_delta ;
};
} // namespace
#endif /* QSTMZOOMGESTURERECOGNISER_H_ */