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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qstandardgestures.h"
+#include "qstandardgestures_p.h"
+
+#include <qabstractscrollarea.h>
+#include <qscrollbar.h>
+#include <private/qapplication_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class QPanGesture
+ \since 4.6
+
+ \brief The QPanGesture class represents a Pan gesture,
+ providing additional information related to panning.
+*/
+
+/*!
+ Creates a new Pan gesture handler object and marks it as a child of \a
+ parent.
+
+ On some platform like Windows it's necessary to provide a non-null widget
+ as \a parent to get native gesture support.
+*/
+QPanGesture::QPanGesture(QWidget *parent)
+ : QGesture(*new QPanGesturePrivate, parent)
+{
+#ifdef Q_WS_WIN
+ if (parent) {
+ QApplicationPrivate* getQApplicationPrivateInternal();
+ QApplicationPrivate *qAppPriv = getQApplicationPrivateInternal();
+ qAppPriv->widgetGestures[parent].pan = this;
+ }
+#endif
+}
+
+/*! \internal */
+bool QPanGesture::event(QEvent *event)
+{
+#ifdef Q_WS_WIN
+ QApplicationPrivate* getQApplicationPrivateInternal();
+ switch (event->type()) {
+ case QEvent::ParentAboutToChange:
+ if (QWidget *w = qobject_cast<QWidget*>(parent()))
+ getQApplicationPrivateInternal()->widgetGestures[w].pan = 0;
+ break;
+ case QEvent::ParentChange:
+ if (QWidget *w = qobject_cast<QWidget*>(parent()))
+ getQApplicationPrivateInternal()->widgetGestures[w].pan = this;
+ break;
+ default:
+ break;
+ }
+#endif
+ return QObject::event(event);
+}
+
+/*! \internal */
+bool QPanGesture::filterEvent(QEvent *event)
+{
+ Q_D(QPanGesture);
+ if (!event->spontaneous())
+ return false;
+ const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+ if (event->type() == QEvent::TouchBegin) {
+ d->touchPoints = ev->touchPoints();
+ const QPoint p = ev->touchPoints().at(0).pos().toPoint();
+ setStartPos(p);
+ setLastPos(p);
+ setPos(p);
+ return false;
+ } else if (event->type() == QEvent::TouchEnd) {
+ if (state() != Qt::NoGesture) {
+ setState(Qt::GestureFinished);
+ setLastPos(pos());
+ setPos(ev->touchPoints().at(0).pos().toPoint());
+ emit triggered();
+ emit finished();
+ }
+ setState(Qt::NoGesture);
+ reset();
+ } else if (event->type() == QEvent::TouchUpdate) {
+ d->touchPoints = ev->touchPoints();
+ QPointF pt = d->touchPoints.at(0).pos() - d->touchPoints.at(0).startPos();
+ setLastPos(pos());
+ setPos(ev->touchPoints().at(0).pos().toPoint());
+ if (pt.x() > 10 || pt.y() > 10 || pt.x() < -10 || pt.y() < -10) {
+ if (state() == Qt::NoGesture)
+ setState(Qt::GestureStarted);
+ else
+ setState(Qt::GestureUpdated);
+ emit triggered();
+ }
+ }
+ return false;
+}
+
+/*! \internal */
+void QPanGesture::reset()
+{
+ Q_D(QPanGesture);
+ d->touchPoints.clear();
+}
+
+/*!
+ \property QPanGesture::totalOffset
+
+ Specifies a total pan offset since the start of the gesture.
+*/
+QSize QPanGesture::totalOffset() const
+{
+ QPoint pt = pos() - startPos();
+ return QSize(pt.x(), pt.y());
+}
+
+/*!
+ \property QPanGesture::lastOffset
+
+ Specifies a pan offset since the last time the gesture was
+ triggered.
+*/
+QSize QPanGesture::lastOffset() const
+{
+ QPoint pt = pos() - lastPos();
+ return QSize(pt.x(), pt.y());
+}
+
+/*!
+ \class QTapAndHoldGesture
+ \since 4.6
+
+ \brief The QTapAndHoldGesture class represents a Tap-and-Hold gesture,
+ providing additional information.
+*/
+
+const int QTapAndHoldGesturePrivate::iterationCount = 40;
+const int QTapAndHoldGesturePrivate::iterationTimeout = 50;
+
+/*!
+ Creates a new Tap and Hold gesture handler object and marks it as a child
+ of \a parent.
+
+ On some platforms like Windows there is a system-wide tap and hold gesture
+ that cannot be overriden, hence the gesture might never trigger and default
+ context menu will be shown instead.
+*/
+QTapAndHoldGesture::QTapAndHoldGesture(QWidget *parent)
+ : QGesture(*new QTapAndHoldGesturePrivate, parent)
+{
+}
+
+/*! \internal */
+bool QTapAndHoldGesture::filterEvent(QEvent *event)
+{
+ Q_D(QTapAndHoldGesture);
+ if (!event->spontaneous())
+ return false;
+ const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+ switch (event->type()) {
+ case QEvent::TouchBegin: {
+ if (d->timer.isActive())
+ d->timer.stop();
+ d->timer.start(QTapAndHoldGesturePrivate::iterationTimeout, this);
+ const QPoint p = ev->touchPoints().at(0).pos().toPoint();
+ setStartPos(p);
+ setLastPos(p);
+ setPos(p);
+ break;
+ }
+ case QEvent::TouchUpdate:
+ if (ev->touchPoints().size() != 1)
+ reset();
+ else if ((startPos() - ev->touchPoints().at(0).pos().toPoint()).manhattanLength() > 15)
+ reset();
+ break;
+ case QEvent::TouchEnd:
+ reset();
+ break;
+ default:
+ break;
+ }
+ return false;
+}
+
+/*! \internal */
+void QTapAndHoldGesture::timerEvent(QTimerEvent *event)
+{
+ Q_D(QTapAndHoldGesture);
+ if (event->timerId() != d->timer.timerId())
+ return;
+ if (d->iteration == QTapAndHoldGesturePrivate::iterationCount) {
+ d->timer.stop();
+ setState(Qt::GestureFinished);
+ emit triggered();
+ } else {
+ setState(Qt::GestureStarted);
+ emit triggered();
+ }
+ ++d->iteration;
+}
+
+/*! \internal */
+void QTapAndHoldGesture::reset()
+{
+ Q_D(QTapAndHoldGesture);
+ if (state() != Qt::NoGesture)
+ emit cancelled();
+ setState(Qt::NoGesture);
+ d->timer.stop();
+ d->iteration = 0;
+}
+
+QT_END_NAMESPACE