author | hgs |
Wed, 01 Sep 2010 13:56:21 -0400 | |
changeset 11 | 786160610b4d |
parent 3 | 0954f5dd2cd0 |
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, version 2.1 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, |
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* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/". |
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* |
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* Description: |
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* |
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*/ |
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#ifndef QSTMZOOMGESTURERECOGNISER_H_ |
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#define QSTMZOOMGESTURERECOGNISER_H_ |
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#include <qstmgestureengine_if.h> |
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#include <qstmgesture_if.h> |
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#include <qstmgesturelistener_if.h> |
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namespace qstmGesture |
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{ |
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/*! |
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* QStm_ZoomGestureRecogniser handles zoomin gesture: start from near lower left / upper right corner and drag |
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* This is useful if one wants to implement single handed zooming so can be done using thumb |
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* (no need to use pinch i.e. hold device in one hand and use two fingers of the other) |
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* Current spec is: |
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* - touch lower left corner and start dragging => initialize ZOOM IN |
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* - touch upper right corner and start dragging => initialize ZOOM OUT |
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* store the touch point and then calculate the distance until release |
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* The distance is the zoom factor (probably needs some adjustment, not just the pixels...) |
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*/ |
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class QStm_ZoomGestureRecogniser : public QStm_GestureRecogniser |
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{ |
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public: |
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static const QStm_GestureUid KUid = EGestureUidCornerZoom; |
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virtual ~QStm_ZoomGestureRecogniser(); |
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virtual QStm_GestureRecognitionState recognise(int numOfActiveStreams, QStm_GestureEngineIf* ge) ; |
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virtual void release(QStm_GestureEngineIf* ge) ; |
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virtual QStm_GestureUid gestureUid() const { return KUid; } |
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/*! |
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* Additional methods to set up zoom in gesture recogniser: |
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* define the rectangle where the lower left corner is |
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* \param theArea |
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*/ |
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void setArea(const QRect& theArea) ; |
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/*! |
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* Additional methods to set up zoom in gesture recogniser: |
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* Define how close to the lower left corner the touch must happen |
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* \param rangeInPixels |
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*/ |
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void setRange(int rangeInMm) ; |
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QStm_ZoomGestureRecogniser(QStm_GestureListenerIf* listener) ; |
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float calculateDistance(const QPoint& aTp) ; |
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int adjustZoom(float& previousDistance, float newDistance) ; |
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private: |
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QRect m_area ; |
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int m_rangesizeInPixels ; |
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QStm_ZoomType m_zoomtype ; |
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bool m_zooming ; |
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QPoint m_startingtouch ; |
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QPoint m_previoustouch ; |
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int m_delta ; |
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}; |
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} // namespace |
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#endif /* QSTMZOOMGESTURERECOGNISER_H_ */ |