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Diffstat (limited to 'src/imports/gestures/qdeclarativegesturearea.cpp')
| -rw-r--r-- | src/imports/gestures/qdeclarativegesturearea.cpp | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/imports/gestures/qdeclarativegesturearea.cpp b/src/imports/gestures/qdeclarativegesturearea.cpp new file mode 100644 index 00000000..afd92b06 --- /dev/null +++ b/src/imports/gestures/qdeclarativegesturearea.cpp @@ -0,0 +1,282 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdeclarativegesturearea_p.h" + +#include <qdeclarativeexpression.h> +#include <qdeclarativecontext.h> +#include <qdeclarativeinfo.h> + +#include <private/qdeclarativeproperty_p.h> +#include <private/qdeclarativeitem_p.h> + +#include <QtCore/qdebug.h> +#include <QtCore/qstringlist.h> + +#include <QtGui/qevent.h> + +#include <private/qobject_p.h> + +#ifndef QT_NO_GESTURES + +QT_BEGIN_NAMESPACE + +class QDeclarativeGestureAreaPrivate : public QDeclarativeItemPrivate +{ + Q_DECLARE_PUBLIC(QDeclarativeGestureArea) +public: + QDeclarativeGestureAreaPrivate() : componentcomplete(false), gesture(0) {} + + typedef QMap<Qt::GestureType,QDeclarativeExpression*> Bindings; + Bindings bindings; + + bool componentcomplete; + + QByteArray data; + + QGesture *gesture; + + bool gestureEvent(QGestureEvent *event); +}; + +/*! + \qmlclass GestureArea QDeclarativeGestureArea + \ingroup qml-basic-interaction-elements + + \brief The GestureArea item enables simple gesture handling. + \inherits Item + + A GestureArea is like a MouseArea, but it has signals for gesture events. + + \warning Elements in the Qt.labs module are not guaranteed to remain compatible + in future versions. + + \warning GestureArea is an experimental element whose development has + been discontinued. PinchArea is available in QtQuick 1.1 and handles + two finger gesture input. + + \note This element is only functional on devices with touch input. + + \qml + import Qt.labs.gestures 1.0 + + GestureArea { + anchors.fill: parent + // onPan: ... gesture.acceleration ... + // onPinch: ... gesture.rotationAngle ... + // onSwipe: ... + // onTapAndHold: ... + // onTap: ... + // onGesture: ... + } + \endqml + + Each signal has a \e gesture parameter that has the + properties of the gesture. + + \table + \header \o Signal \o Type \o Property \o Description + \row \o onTap \o point \o position \o the position of the tap + \row \o onTapAndHold \o point \o position \o the position of the tap + \row \o onPan \o real \o acceleration \o the acceleration of the pan + \row \o onPan \o point \o delta \o the offset from the previous input position to the current input + \row \o onPan \o point \o offset \o the total offset from the first input position to the current input position + \row \o onPan \o point \o lastOffset \o the previous value of offset + \row \o onPinch \o point \o centerPoint \o the midpoint between the two input points + \row \o onPinch \o point \o lastCenterPoint \o the previous value of centerPoint + \row \o onPinch \o point \o startCenterPoint \o the first value of centerPoint + \row \o onPinch \o real \o rotationAngle \o the angle covered by the gesture motion + \row \o onPinch \o real \o lastRotationAngle \o the previous value of rotationAngle + \row \o onPinch \o real \o totalRotationAngle \o the complete angle covered by the gesture + \row \o onPinch \o real \o scaleFactor \o the change in distance between the two input points + \row \o onPinch \o real \o lastScaleFactor \o the previous value of scaleFactor + \row \o onPinch \o real \o totalScaleFactor \o the complete scale factor of the gesture + \row \o onSwipe \o real \o swipeAngle \o the angle of the swipe + \endtable + + Custom gestures, handled by onGesture, will have custom properties. + + GestureArea is an invisible item: it is never painted. + + \sa MouseArea +*/ + +/*! + \internal + \class QDeclarativeGestureArea + \brief The QDeclarativeGestureArea class provides simple gesture handling. + +*/ +QDeclarativeGestureArea::QDeclarativeGestureArea(QDeclarativeItem *parent) : + QDeclarativeItem(*(new QDeclarativeGestureAreaPrivate), parent) +{ + setAcceptedMouseButtons(Qt::LeftButton); + setAcceptTouchEvents(true); +} + +QDeclarativeGestureArea::~QDeclarativeGestureArea() +{ +} + +QByteArray +QDeclarativeGestureAreaParser::compile(const QList<QDeclarativeCustomParserProperty> &props) +{ + QByteArray rv; + QDataStream ds(&rv, QIODevice::WriteOnly); + + for(int ii = 0; ii < props.count(); ++ii) + { + QString propName = QString::fromUtf8(props.at(ii).name()); + Qt::GestureType type; + + if (propName == QLatin1String("onTap")) { + type = Qt::TapGesture; + } else if (propName == QLatin1String("onTapAndHold")) { + type = Qt::TapAndHoldGesture; + } else if (propName == QLatin1String("onPan")) { + type = Qt::PanGesture; + } else if (propName == QLatin1String("onPinch")) { + type = Qt::PinchGesture; + } else if (propName == QLatin1String("onSwipe")) { + type = Qt::SwipeGesture; + } else if (propName == QLatin1String("onGesture")) { + type = Qt::CustomGesture; + } else { + error(props.at(ii), QDeclarativeGestureArea::tr("Cannot assign to non-existent property \"%1\"").arg(propName)); + return QByteArray(); + } + + QList<QVariant> values = props.at(ii).assignedValues(); + + for (int i = 0; i < values.count(); ++i) { + const QVariant &value = values.at(i); + + if (value.userType() == qMetaTypeId<QDeclarativeCustomParserNode>()) { + error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: nested objects not allowed")); + return QByteArray(); + } else if (value.userType() == qMetaTypeId<QDeclarativeCustomParserProperty>()) { + error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: syntax error")); + return QByteArray(); + } else { + QDeclarativeParser::Variant v = qvariant_cast<QDeclarativeParser::Variant>(value); + if (v.isScript()) { + ds << propName; + ds << int(type); + ds << v.asScript(); + } else { + error(props.at(ii), QDeclarativeGestureArea::tr("GestureArea: script expected")); + return QByteArray(); + } + } + } + } + + return rv; +} + +void QDeclarativeGestureAreaParser::setCustomData(QObject *object, + const QByteArray &data) +{ + QDeclarativeGestureArea *ga = static_cast<QDeclarativeGestureArea*>(object); + ga->d_func()->data = data; +} + + +void QDeclarativeGestureArea::connectSignals() +{ + Q_D(QDeclarativeGestureArea); + if (!d->componentcomplete) + return; + + QDataStream ds(d->data); + while (!ds.atEnd()) { + QString propName; + ds >> propName; + int gesturetype; + ds >> gesturetype; + QString script; + ds >> script; + QDeclarativeExpression *exp = new QDeclarativeExpression(qmlContext(this), this, script); + d->bindings.insert(Qt::GestureType(gesturetype),exp); + grabGesture(Qt::GestureType(gesturetype)); + } +} + +void QDeclarativeGestureArea::componentComplete() +{ + QDeclarativeItem::componentComplete(); + Q_D(QDeclarativeGestureArea); + d->componentcomplete=true; + connectSignals(); +} + +QGesture *QDeclarativeGestureArea::gesture() const +{ + Q_D(const QDeclarativeGestureArea); + return d->gesture; +} + +bool QDeclarativeGestureArea::sceneEvent(QEvent *event) +{ + Q_D(QDeclarativeGestureArea); + if (event->type() == QEvent::Gesture) + return d->gestureEvent(static_cast<QGestureEvent*>(event)); + return QDeclarativeItem::sceneEvent(event); +} + +bool QDeclarativeGestureAreaPrivate::gestureEvent(QGestureEvent *event) +{ + bool accept = true; + for (Bindings::Iterator it = bindings.begin(); it != bindings.end(); ++it) { + if ((gesture = event->gesture(it.key()))) { + QDeclarativeExpression *expr = it.value(); + expr->evaluate(); + if (expr->hasError()) + qmlInfo(q_func()) << expr->error(); + event->setAccepted(true); // XXX only if value returns true? + } + } + return accept; +} + +QT_END_NAMESPACE + +#endif // QT_NO_GESTURES |