/****************************************************************************

**

** 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"

#include "qdebug.h"

QT_BEGIN_NAMESPACE

QPanGestureRecognizer::QPanGestureRecognizer()

{

}

QGesture *QPanGestureRecognizer::create(QObject *target)

{

    if (target && target->isWidgetType()) {

#if defined(Q_OS_WIN) && !defined(QT_NO_NATIVE_GESTURES)

        // 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->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->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.screenPos(), p2.screenPos()).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;

            qreal angle = QLineF(p1.screenPos(), p2.screenPos()).angle();

            if (angle > 180)

                angle -= 360;

            qreal startAngle = QLineF(p1.startScreenPos(), p2.startScreenPos()).angle();

            if (startAngle > 180)

                startAngle -= 360;

            const qreal rotationAngle = startAngle - 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;

            if (q->state() == Qt::NoGesture)

                result = QGestureRecognizer::Ignore;

            else

                result = QGestureRecognizer::FinishGesture;

        }

        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;

    d->startPosition[0] = d->startPosition[1] = QPointF();

    QGestureRecognizer::reset(state);

}

//

// QSwipeGestureRecognizer

//

QSwipeGestureRecognizer::QSwipeGestureRecognizer()

{

}

QGesture *QSwipeGestureRecognizer::create(QObject *target)

{

    if (target && target->isWidgetType()) {

        static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

    }

    return new QSwipeGesture;

}

QGestureRecognizer::Result QSwipeGestureRecognizer::recognize(QGesture *state,

                                                              QObject *,

                                                              QEvent *event)

{

    QSwipeGesture *q = static_cast<QSwipeGesture *>(state);

    QSwipeGesturePrivate *d = q->d_func();

    const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

    QGestureRecognizer::Result result;

    switch (event->type()) {

    case QEvent::TouchBegin: {

        d->speed = 1;

        d->time = QTime::currentTime();

        d->started = true;

        result = QGestureRecognizer::MayBeGesture;

        break;

    }

    case QEvent::TouchEnd: {

        if (q->state() != Qt::NoGesture) {

            result = QGestureRecognizer::FinishGesture;

        } else {

            result = QGestureRecognizer::CancelGesture;

        }

        break;

    }

    case QEvent::TouchUpdate: {

        if (!d->started)

            result = QGestureRecognizer::CancelGesture;

        else if (ev->touchPoints().size() == 3) {

            QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);

            QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);

            QTouchEvent::TouchPoint p3 = ev->touchPoints().at(2);

            if (d->lastPositions[0].isNull()) {

                d->lastPositions[0] = p1.startScreenPos().toPoint();

                d->lastPositions[1] = p2.startScreenPos().toPoint();

                d->lastPositions[2] = p3.startScreenPos().toPoint();

            }

            d->hotSpot = p1.screenPos();

            d->isHotSpotSet = true;

            int xDistance = (p1.screenPos().x() - d->lastPositions[0].x() +

                             p2.screenPos().x() - d->lastPositions[1].x() +

                             p3.screenPos().x() - d->lastPositions[2].x()) / 3;

            int yDistance = (p1.screenPos().y() - d->lastPositions[0].y() +

                             p2.screenPos().y() - d->lastPositions[1].y() +

                             p3.screenPos().y() - d->lastPositions[2].y()) / 3;

            const int distance = xDistance >= yDistance ? xDistance : yDistance;

            int elapsedTime = d->time.msecsTo(QTime::currentTime());

            if (!elapsedTime)

                elapsedTime = 1;

            d->speed = 0.9 * d->speed + distance / elapsedTime;

            d->time = QTime::currentTime();

            d->swipeAngle = QLineF(p1.startScreenPos(), p1.screenPos()).angle();

            static const int MoveThreshold = 50;

            if (xDistance > MoveThreshold || yDistance > MoveThreshold) {

                // measure the distance to check if the direction changed

                d->lastPositions[0] = p1.screenPos().toPoint();

                d->lastPositions[1] = p2.screenPos().toPoint();

                d->lastPositions[2] = p3.screenPos().toPoint();

                QSwipeGesture::SwipeDirection horizontal =

                        xDistance > 0 ? QSwipeGesture::Right : QSwipeGesture::Left;

                QSwipeGesture::SwipeDirection vertical =

                        yDistance > 0 ? QSwipeGesture::Down : QSwipeGesture::Up;

                if (d->verticalDirection == QSwipeGesture::NoDirection)

                    d->verticalDirection = vertical;

                if (d->horizontalDirection == QSwipeGesture::NoDirection)

                    d->horizontalDirection = horizontal;

                if (d->verticalDirection != vertical || d->horizontalDirection != horizontal) {

                    // the user has changed the direction!

                    result = QGestureRecognizer::CancelGesture;

                }

                result = QGestureRecognizer::TriggerGesture;

            } else {

                if (q->state() != Qt::NoGesture)

                    result = QGestureRecognizer::TriggerGesture;

                else

                    result = QGestureRecognizer::MayBeGesture;

            }

        } else if (ev->touchPoints().size() > 3) {

            result = QGestureRecognizer::CancelGesture;

        } else { // less than 3 touch points

            if (d->started && (ev->touchPointStates() & Qt::TouchPointPressed))

                result = QGestureRecognizer::CancelGesture;

            else if (d->started)

                result = QGestureRecognizer::Ignore;

            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 QSwipeGestureRecognizer::reset(QGesture *state)

{

    QSwipeGesture *q = static_cast<QSwipeGesture *>(state);

    QSwipeGesturePrivate *d = q->d_func();

    d->verticalDirection = d->horizontalDirection = QSwipeGesture::NoDirection;

    d->swipeAngle = 0;

    d->lastPositions[0] = d->lastPositions[1] = d->lastPositions[2] = QPoint();

    d->started = false;

    d->speed = 0;

    d->time = QTime();

    QGestureRecognizer::reset(state);

}

//

// QTapGestureRecognizer

//

QTapGestureRecognizer::QTapGestureRecognizer()

{

}

QGesture *QTapGestureRecognizer::create(QObject *target)

{

    if (target && target->isWidgetType()) {

        static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

    }

    return new QTapGesture;

}

QGestureRecognizer::Result QTapGestureRecognizer::recognize(QGesture *state,

                                                            QObject *,

                                                            QEvent *event)

{

    QTapGesture *q = static_cast<QTapGesture *>(state);

    QTapGesturePrivate *d = q->d_func();

    const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

    QGestureRecognizer::Result result = QGestureRecognizer::CancelGesture;

    switch (event->type()) {

    case QEvent::TouchBegin: {

        d->position = ev->touchPoints().at(0).pos();

        result = QGestureRecognizer::TriggerGesture;

        break;

    }

    case QEvent::TouchUpdate:

    case QEvent::TouchEnd: {

        if (q->state() != Qt::NoGesture && ev->touchPoints().size() == 1) {

            QTouchEvent::TouchPoint p = ev->touchPoints().at(0);

            QPoint delta = p.pos().toPoint() - p.startPos().toPoint();

            enum { TapRadius = 40 };

            if (delta.manhattanLength() <= TapRadius) {

                if (event->type() == QEvent::TouchEnd)

                    result = QGestureRecognizer::FinishGesture;

                else

                    result = QGestureRecognizer::TriggerGesture;

            }

        }

        break;

    }

    case QEvent::MouseButtonPress:

    case QEvent::MouseMove:

    case QEvent::MouseButtonRelease:

        result = QGestureRecognizer::Ignore;

        break;

    default:

        result = QGestureRecognizer::Ignore;

        break;

    }

    return result;

}

void QTapGestureRecognizer::reset(QGesture *state)

{

    QTapGesture *q = static_cast<QTapGesture *>(state);

    QTapGesturePrivate *d = q->d_func();

    d->position = QPointF();

    QGestureRecognizer::reset(state);

}

//

// QTapAndHoldGestureRecognizer

//

QTapAndHoldGestureRecognizer::QTapAndHoldGestureRecognizer()

{

}

QGesture *QTapAndHoldGestureRecognizer::create(QObject *target)

{

    if (target && target->isWidgetType()) {

        static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

    }

    return new QTapAndHoldGesture;

}

QGestureRecognizer::Result