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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qstandardgestures_p.h"
#include "qgesture.h"
#include "qgesture_p.h"
#include "qevent.h"
#include "qwidget.h"
#include "qabstractscrollarea.h"
QT_BEGIN_NAMESPACE
QPanGestureRecognizer::QPanGestureRecognizer()
{
}
QGesture *QPanGestureRecognizer::create(QObject *target)
{
if (target && target->isWidgetType()) {
#if defined(Q_OS_WIN)
// for scroll areas on Windows we want to use native gestures instead
if (!qobject_cast<QAbstractScrollArea *>(target->parent()))
static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);
#else
static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);
#endif
}
return new QPanGesture;
}
QGestureRecognizer::Result QPanGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)
{
QPanGesture *q = static_cast<QPanGesture *>(state);
QPanGesturePrivate *d = q->d_func();
const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);
QGestureRecognizer::Result result;
switch (event->type()) {
case QEvent::TouchBegin: {
result = QGestureRecognizer::MayBeGesture;
QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
d->lastPosition = p.pos().toPoint();
d->lastOffset = d->offset = QPointF();
break;
}
case QEvent::TouchEnd: {
if (q->state() != Qt::NoGesture) {
if (ev->touchPoints().size() == 2) {
QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
d->lastOffset = d->offset;
d->offset =
QPointF(p1.pos().x() - p1.startPos().x() + p2.pos().x() - p2.startPos().x(),
p1.pos().y() - p1.startPos().y() + p2.pos().y() - p2.startPos().y()) / 2;
}
result = QGestureRecognizer::FinishGesture;
} else {
result = QGestureRecognizer::CancelGesture;
}
break;
}
case QEvent::TouchUpdate: {
if (ev->touchPoints().size() >= 2) {
QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
d->lastOffset = d->offset;
d->offset =
QPointF(p1.pos().x() - p1.startPos().x() + p2.pos().x() - p2.startPos().x(),
p1.pos().y() - p1.startPos().y() + p2.pos().y() - p2.startPos().y()) / 2;
if (d->offset.x() > 10 || d->offset.y() > 10 ||
d->offset.x() < -10 || d->offset.y() < -10) {
result = QGestureRecognizer::TriggerGesture;
} else {
result = QGestureRecognizer::MayBeGesture;
}
}
break;
}
case QEvent::MouseButtonPress:
case QEvent::MouseMove:
case QEvent::MouseButtonRelease:
result = QGestureRecognizer::Ignore;
break;
default:
result = QGestureRecognizer::Ignore;
break;
}
return result;
}
void QPanGestureRecognizer::reset(QGesture *state)
{
QPanGesture *pan = static_cast<QPanGesture*>(state);
QPanGesturePrivate *d = pan->d_func();
d->lastOffset = d->offset = QPointF();
d->lastPosition = QPoint();
d->acceleration = 0;
QGestureRecognizer::reset(state);
}
//
// QPinchGestureRecognizer
//
QPinchGestureRecognizer::QPinchGestureRecognizer()
{
}
QGesture *QPinchGestureRecognizer::create(QObject *target)
{
if (target && target->isWidgetType()) {
static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);
}
return new QPinchGesture;
}
QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)
{
QPinchGesture *q = static_cast<QPinchGesture *>(state);
QPinchGesturePrivate *d = q->d_func();
const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);
QGestureRecognizer::Result result;
switch (event->type()) {
case QEvent::TouchBegin: {
result = QGestureRecognizer::MayBeGesture;
break;
}
case QEvent::TouchEnd: {
if (q->state() != Qt::NoGesture) {
result = QGestureRecognizer::FinishGesture;
} else {
result = QGestureRecognizer::CancelGesture;
}
break;
}
case QEvent::TouchUpdate: {
d->changeFlags = 0;
if (ev->touchPoints().size() == 2) {
QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
d->hotSpot = p1.screenPos();
d->isHotSpotSet = true;
if (d->isNewSequence) {
d->startPosition[0] = p1.screenPos();
d->startPosition[1] = p2.screenPos();
}
QLineF line(p1.screenPos(), p2.screenPos());
QLineF tmp(line);
tmp.setLength(line.length() / 2.);
QPointF centerPoint = tmp.p2();
d->lastCenterPoint = d->centerPoint;
d->centerPoint = centerPoint;
d->changeFlags |= QPinchGesture::CenterPointChanged;
const qreal scaleFactor = QLineF(p1.pos(), p2.pos()).length()
/ QLineF(d->startPosition[0], d->startPosition[1]).length();
if (d->isNewSequence) {
d->lastScaleFactor = scaleFactor;
} else {
d->lastScaleFactor = d->scaleFactor;
}
d->scaleFactor = scaleFactor;
d->totalScaleFactor += d->scaleFactor - d->lastScaleFactor;
d->changeFlags |= QPinchGesture::ScaleFactorChanged;
const qreal rotationAngle = -line.angle();
if (d->isNewSequence)
d->lastRotationAngle = rotationAngle;
else
d->lastRotationAngle = d->rotationAngle;
d->rotationAngle = rotationAngle;
d->totalRotationAngle += d->rotationAngle - d->lastRotationAngle;
d->changeFlags |= QPinchGesture::RotationAngleChanged;
d->totalChangeFlags |= d->changeFlags;
d->isNewSequence = false;
result = QGestureRecognizer::TriggerGesture;
} else {
d->isNewSequence = true;
result = QGestureRecognizer::MayBeGesture;
}
break;
}
case QEvent::MouseButtonPress:
case QEvent::MouseMove:
case QEvent::MouseButtonRelease:
result = QGestureRecognizer::Ignore;
break;
default:
result = QGestureRecognizer::Ignore;
break;
}
return result;
}
void QPinchGestureRecognizer::reset(QGesture *state)
{
QPinchGesture *pinch = static_cast<QPinchGesture *>(state);
QPinchGesturePrivate *d = pinch->d_func();
d->totalChangeFlags = d->changeFlags = 0;
d->startCenterPoint = d->lastCenterPoint = d->centerPoint = QPointF();
d->totalScaleFactor = d->lastScaleFactor = d->scaleFactor = 0;
d->totalRotationAngle = d->lastRotationAngle = d->rotationAngle = 0;
d->isNewSequence = true;
QGestureRecognizer::reset(state);
}
QT_END_NAMESPACE
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