/****************************************************************************+
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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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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtDeclarative module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qdeclarativegesturearea_p.h"+
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+
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#include <qdeclarativeexpression.h>+
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#include <qdeclarativecontext.h>+
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#include <qdeclarativeinfo.h>+
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+
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#include <private/qdeclarativeproperty_p.h>+
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#include <private/qdeclarativeitem_p.h>+
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+
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#include <QtCore/qdebug.h>+
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#include <QtCore/qstringlist.h>+
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+
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#include <QtGui/qevent.h>+
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+
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#include <private/qobject_p.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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class QDeclarativeGestureAreaPrivate : public QDeclarativeItemPrivate+
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{+
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    Q_DECLARE_PUBLIC(QDeclarativeGestureArea)+
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public:+
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    QDeclarativeGestureAreaPrivate() : componentcomplete(false), gesture(0) {}+
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+
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    typedef QMap<Qt::GestureType,QDeclarativeExpression*> Bindings;+
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    Bindings bindings;+
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+
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    bool componentcomplete;+
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+
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    QByteArray data;+
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+
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    QGesture *gesture;+
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+
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    bool gestureEvent(QGestureEvent *event);+
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};+
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+
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/*!+
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    \qmlclass GestureArea QDeclarativeGestureArea+
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    \brief The GestureArea item enables simple gesture handling.+
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    \inherits Item+
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+
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    A GestureArea is like a MouseArea, but it has signals for gesture events.+
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+
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    \e {Elements in the Qt.labs module are not guaranteed to remain compatible+
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    in future versions.}+
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+
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    \e {This element is only functional on devices with touch input.}+
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+
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    \qml+
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    import Qt.labs.gestures 0.1+
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+
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    GestureArea {+
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        anchors.fill: parent+
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        onPan: ... gesture.acceleration ...+
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        onPinch: ... gesture.rotationAngle ...+
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        onSwipe: ...+
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        onTapAndHold: ...+
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        onTap: ...+
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        onGesture: ...+
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    }+
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    \endqml+
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+
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    Each signal has a \e gesture parameter that has the+
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    properties of the gesture.+
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+
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    \table+
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    \header \o Signal \o Type \o Property \o Description+
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    \row \o onTap \o point \o position \o the position of the tap+
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    \row \o onTapAndHold \o point \o position \o the position of the tap+
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    \row \o onPan \o real \o acceleration \o the acceleration of the pan+
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    \row \o onPan \o point \o delta \o the offset from the previous input position to the current input+
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    \row \o onPan \o point \o offset \o the total offset from the first input position to the current input position+
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    \row \o onPan \o point \o lastOffset \o the previous value of offset+
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    \row \o onPinch \o point \o centerPoint \o the midpoint between the two input points+
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    \row \o onPinch \o point \o lastCenterPoint \o the previous value of centerPoint+
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    \row \o onPinch \o point \o startCenterPoint \o the first value of centerPoint+
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    \row \o onPinch \o real \o rotationAngle \o the angle covered by the gesture motion+
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    \row \o onPinch \o real \o lastRotationAngle \o the previous value of rotationAngle+
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    \row \o onPinch \o real \o totalRotationAngle \o the complete angle covered by the gesture+
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    \row \o onPinch \o real \o scaleFactor \o the change in distance between the two input points+
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    \row \o onPinch \o real \o lastScaleFactor \o the previous value of scaleFactor+
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    \row \o onPinch \o real \o totalScaleFactor \o the complete scale factor of the gesture+
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    \row \o onSwipe \o real \o swipeAngle \o the angle of the swipe+
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    \endtable+
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+
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    Custom gestures, handled by onGesture, will have custom properties.+
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+
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    GestureArea is an invisible item: it is never painted.+
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+
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    \sa Gesture, MouseArea+
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*/+
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+
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/*!+
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    \internal+
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    \class QDeclarativeGestureArea+
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    \brief The QDeclarativeGestureArea class provides simple gesture handling.+
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+
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*/+
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QDeclarativeGestureArea::QDeclarativeGestureArea(QDeclarativeItem *parent) :+
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    QDeclarativeItem(*(new QDeclarativeGestureAreaPrivate), parent)+
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{+
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    setAcceptedMouseButtons(Qt::LeftButton);+
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    setAcceptTouchEvents(true);+
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}+
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+
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QDeclarativeGestureArea::~QDeclarativeGestureArea()+
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{+
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}+
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+
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QByteArray+
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QDeclarativeGestureAreaParser::compile(const QList<QDeclarativeCustomParserProperty> &props)+
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{+
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    QByteArray rv;+
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    QDataStream ds(&rv, QIODevice::WriteOnly);+
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+
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    for(int ii = 0; ii < props.count(); ++ii)+
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    {+
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        QString propName = QString::fromUtf8(props.at(ii).name());+
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        Qt::GestureType type;+
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+
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        if (propName == QLatin1String("onTap")) {+
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            type = Qt::TapGesture;+
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        } else if (propName == QLatin1String("onTapAndHold")) {+
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            type = Qt::TapAndHoldGesture;+
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        } else if (propName == QLatin1String("onPan")) {+
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            type = Qt::PanGesture;+
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        } else if (propName == QLatin1String("onPinch")) {+
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            type = Qt::PinchGesture;+
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        } else if (propName == QLatin1String("onSwipe")) {+
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            type = Qt::SwipeGesture;+
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        } else if (propName == QLatin1String("onGesture")) {+
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            type = Qt::CustomGesture;+
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        } else {+
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            error(props.at(ii), QDeclarativeGestureArea::tr("Cannot assign to non-existent property \"%1\"").arg(propName));+
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            return QByteArray();+
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        }+
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+
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        QList<QVariant> values = props.at(ii).assignedValues();+
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+
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        for (int i = 0; i < values.count(); ++i) {+
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            const QVariant &value = values.at(i);+
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+
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            if (value.userType() == qMetaTypeId<QDeclarativeCustomParserNode>()) {+
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                error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: nested objects not allowed"));+
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                return QByteArray();+
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            } else if (value.userType() == qMetaTypeId<QDeclarativeCustomParserProperty>()) {+
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                error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: syntax error"));+
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                return QByteArray();+
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            } else {+
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                QDeclarativeParser::Variant v = qvariant_cast<QDeclarativeParser::Variant>(value);+
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                if (v.isScript()) {+
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                    ds << propName;+
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                    ds << int(type);+
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                    ds << v.asScript();+
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                } else {+
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                    error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: script expected"));+
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                    return QByteArray();+
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                }+
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            }+
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        }+
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    }+
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+
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    return rv;+
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}+
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+
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void QDeclarativeGestureAreaParser::setCustomData(QObject *object,+
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                                            const QByteArray &data)+
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{+
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    QDeclarativeGestureArea *ga = static_cast<QDeclarativeGestureArea*>(object);+
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    ga->d_func()->data = data;+
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}+
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+
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+
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void QDeclarativeGestureArea::connectSignals()+
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{+
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    Q_D(QDeclarativeGestureArea);+
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    if (!d->componentcomplete)+
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        return;+
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+
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    QDataStream ds(d->data);+
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    while (!ds.atEnd()) {+
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        QString propName;+
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        ds >> propName;+
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        int gesturetype;+
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        ds >> gesturetype;+
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        QString script;+
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        ds >> script;+
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        QDeclarativeExpression *exp = new QDeclarativeExpression(qmlContext(this), 0, script);+
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        d->bindings.insert(Qt::GestureType(gesturetype),exp);+
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        grabGesture(Qt::GestureType(gesturetype));+
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    }+
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}+
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+
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void QDeclarativeGestureArea::componentComplete()+
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{+
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    QDeclarativeItem::componentComplete();+
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    Q_D(QDeclarativeGestureArea);+
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    d->componentcomplete=true;+
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    connectSignals();+
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}+
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+
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QGesture *QDeclarativeGestureArea::gesture() const+
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{+
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    Q_D(const QDeclarativeGestureArea);+
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    return d->gesture;+
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}+
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+
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bool QDeclarativeGestureArea::sceneEvent(QEvent *event)+
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{+
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    Q_D(QDeclarativeGestureArea);+
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    if (event->type() == QEvent::Gesture)+
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        return d->gestureEvent(static_cast<QGestureEvent*>(event));+
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    return QDeclarativeItem::sceneEvent(event);+
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}+
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+
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bool QDeclarativeGestureAreaPrivate::gestureEvent(QGestureEvent *event)+
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{+
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    bool accept = true;+
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    for (Bindings::Iterator it = bindings.begin(); it != bindings.end(); ++it) {+
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        if ((gesture = event->gesture(it.key()))) {+
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            it.value()->evaluate();+
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            event->setAccepted(true); // XXX only if value returns true?+
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        }+
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    }+
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    return accept;+
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}+
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+
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QT_END_NAMESPACE+
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