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#include "qstandardgestures.h"
#include "qstandardgestures_p.h"

#include <qabstractscrollarea.h>
#include <qscrollbar.h>
#include <private/qapplication_p.h>
#include <private/qevent_p.h>
#include <private/qwidget_p.h>
#include <qmath.h>

QT_BEGIN_NAMESPACE

#ifdef Q_WS_WIN
QWidgetPrivate *qt_widget_private(QWidget *widget);
#endif

/*!
    \class QPanGesture
    \since 4.6

    \brief The QPanGesture class represents a Pan gesture,
    providing additional information related to panning.
*/

/*!
    \enum QSwipeGesture::SwipeDirection
    \brief This enum specifies the direction of the swipe gesture.

    \value NoDirection
    \value Left
    \value Right
    \value Up
    \value Down
*/

/*!
  Creates a new pan gesture handler object and marks it as a child of
  \a parent. The pan gesture handler watches \a gestureTarget for its
  events.

  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 *gestureTarget, QObject *parent)
    : QGesture(*new QPanGesturePrivate, gestureTarget, parent)
{
    setObjectName(QLatin1String("QPanGesture"));
}

void QPanGesturePrivate::setupGestureTarget(QObject *newGestureTarget)
{
    Q_Q(QPanGesture);
    QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();

    if (gestureTarget && gestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(gestureTarget.data());
        if (qAppPriv->widgetGestures[w].pan == q)
            qAppPriv->widgetGestures[w].pan = 0;
#if defined(Q_WS_WIN)
        qt_widget_private(w)->winSetupGestures();
#elif defined(Q_WS_MAC)
        w->setAttribute(Qt::WA_AcceptTouchEvents, false);
        w->setAttribute(Qt::WA_TouchPadAcceptSingleTouchEvents, false);
#endif
    }

    if (newGestureTarget && newGestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(newGestureTarget);
        qAppPriv->widgetGestures[w].pan = q;
#if defined(Q_WS_WIN)
        qt_widget_private(w)->winSetupGestures();
#elif defined(Q_WS_MAC)
        w->setAttribute(Qt::WA_AcceptTouchEvents);
        w->setAttribute(Qt::WA_TouchPadAcceptSingleTouchEvents);
#endif
    }
    QGesturePrivate::setupGestureTarget(newGestureTarget);
}

/*! \internal */
bool QPanGesture::event(QEvent *event)
{
#if defined(QT_MAC_USE_COCOA)
    Q_D(QPanGesture);
    if (event->type() == QEvent::Timer) {
        const QTimerEvent *te = static_cast<QTimerEvent *>(event);
        if (te->timerId() == d->singleTouchPanTimer.timerId()) {
            d->singleTouchPanTimer.stop();
            updateState(Qt::GestureStarted);
        }
    }
#endif

    return QObject::event(event);
}

bool QPanGesture::eventFilter(QObject *receiver, QEvent *event)
{
    Q_D(QPanGesture);

    if (d->implicitGesture && d->gestureTarget && d->gestureTarget->isWidgetType() &&
        static_cast<QWidget*>(d->gestureTarget.data())->testAttribute(Qt::WA_DontUseStandardGestures))
        return false;

#ifdef Q_WS_WIN
    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
        if (it == qAppPriv->widgetGestures.end())
            return false;
        if (this != it.value().pan)
            return false;
        Qt::GestureState nextState = Qt::NoGesture;
        switch(ev->gestureType) {
        case QNativeGestureEvent::GestureBegin:
            // next we might receive the first gesture update event, so we
            // prepare for it.
            d->state = Qt::NoGesture;
            return false;
        case QNativeGestureEvent::Pan:
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::GestureEnd:
            if (state() == Qt::NoGesture)
                return false; // some other gesture has ended
            nextState = Qt::GestureFinished;
            break;
        default:
            return false;
        }
        if (state() == Qt::NoGesture) {
            d->lastOffset = d->totalOffset = d->offset = QSize();
        } else {
            d->lastOffset = d->offset;
            d->offset = QSize(ev->position.x() - d->lastPosition.x(),
                              ev->position.y() - d->lastPosition.y());
            d->totalOffset += d->offset;
        }
        d->lastPosition = ev->position;
        updateState(nextState);
        return true;
    }
#endif
    return QGesture::eventFilter(receiver, event);
}

/*! \internal */
bool QPanGesture::filterEvent(QEvent *event)
{
    Q_D(QPanGesture);

    if (d->implicitGesture && d->gestureTarget && d->gestureTarget->isWidgetType() &&
        static_cast<QWidget*>(d->gestureTarget.data())->testAttribute(Qt::WA_DontUseStandardGestures))
        return false;

#if defined(Q_WS_WIN)
    const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);

    if (event->type() == QEvent::TouchBegin) {
        QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
        d->lastPosition = p.pos().toPoint();
        d->lastOffset = d->totalOffset = d->offset = QSize();
    } else if (event->type() == QEvent::TouchEnd) {
        if (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 =
                        QSize(p1.pos().x() - p1.lastPos().x() + p2.pos().x() - p2.lastPos().x(),
                              p1.pos().y() - p1.lastPos().y() + p2.pos().y() - p2.lastPos().y()) / 2;
                d->totalOffset += d->offset;
            }
            updateState(Qt::GestureFinished);
        }
        reset();
    } else if (event->type() == 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 =
                    QSize(p1.pos().x() - p1.lastPos().x() + p2.pos().x() - p2.lastPos().x(),
                          p1.pos().y() - p1.lastPos().y() + p2.pos().y() - p2.lastPos().y()) / 2;
            d->totalOffset += d->offset;
            if (d->totalOffset.width() > 10  || d->totalOffset.height() > 10 ||
                d->totalOffset.width() < -10 || d->totalOffset.height() < -10) {
                updateState(Qt::GestureUpdated);
            }
        }
    }
#elif defined(QT_MAC_USE_COCOA)
    // The following implements single touch
    // panning on Mac:
    const int panBeginDelay = 300;
    const int panBeginRadius = 3;
    const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);

    switch (event->type()) {
    case QEvent::TouchBegin: {
        if (ev->touchPoints().size() == 1) {
            d->lastPosition = QCursor::pos();
            d->singleTouchPanTimer.start(panBeginDelay, this);
        }
        break;}
    case QEvent::TouchEnd: {
        if (state() != Qt::NoGesture)
            updateState(Qt::GestureFinished);
        reset();
        break;}
    case QEvent::TouchUpdate: {
        if (ev->touchPoints().size() == 1) {
            if (state() == Qt::NoGesture) {
                // INVARIANT: The singleTouchTimer has still not fired.
                // Lets check if the user moved his finger so much from
                // the starting point that it makes sense to cancel:
                const QPointF startPos = ev->touchPoints().at(0).startPos().toPoint();
                const QPointF p = ev->touchPoints().at(0).pos().toPoint();
                if ((startPos - p).manhattanLength() > panBeginRadius)
                    reset();
                else
                    d->lastPosition = QCursor::pos();
            } else {
                QPointF mousePos = QCursor::pos();
                QPointF dist = mousePos - d->lastPosition;
                d->lastPosition = mousePos;
                d->lastOffset = d->offset;
                d->offset = QSizeF(dist.x(), dist.y());
                d->totalOffset += d->offset;
                updateState(Qt::GestureUpdated);
            }
        } else if (state() == Qt::NoGesture) {
            reset();
        }
        break;}
    default:
        return false;
    }
#else
    Q_UNUSED(event);
#endif
    return false;
}

/*! \internal */
void QPanGesture::reset()
{
    Q_D(QPanGesture);
    d->lastOffset = d->totalOffset = d->offset = QSize(0, 0);
    d->lastPosition = QPoint(0, 0);

#if defined(QT_MAC_USE_COCOA)
    d->singleTouchPanTimer.stop();
    d->prevMousePos = QPointF(0, 0);
#endif

    QGesture::reset();
}

/*!
    \property QPanGesture::totalOffset

    Specifies a total pan offset since the start of the gesture.
*/
QSizeF QPanGesture::totalOffset() const
{
    Q_D(const QPanGesture);
    return d->totalOffset;
}

/*!
    \property QPanGesture::lastOffset

    Specifies a pan offset the last time the gesture was triggered.
*/
QSizeF QPanGesture::lastOffset() const
{
    Q_D(const QPanGesture);
    return d->lastOffset;
}

/*!
    \property QPanGesture::offset

    Specifies the current pan offset since the last time the gesture was
    triggered.
*/
QSizeF QPanGesture::offset() const
{
    Q_D(const QPanGesture);
    return d->offset;
}

//////////////////////////////////////////////////////////////////////////////

/*!
    \class QPinchGesture
    \since 4.6

    \brief The QPinchGesture class represents a Pinch gesture,
    providing additional information related to zooming and/or rotation.
*/

/*!
  Creates a new Pinch gesture handler object and marks it as a child
  of \a parent. The pan gesture handler watches \a gestureTarget for its
  events.

  On some platform like Windows it's necessary to provide a non-null
  widget as \a parent to get native gesture support.
*/
QPinchGesture::QPinchGesture(QWidget *gestureTarget, QObject *parent)
    : QGesture(*new QPinchGesturePrivate, gestureTarget, parent)
{
    setObjectName(QLatin1String("QPinchGesture"));
}

void QPinchGesturePrivate::setupGestureTarget(QObject *newGestureTarget)
{
    Q_Q(QPinchGesture);
    if (gestureTarget && gestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(gestureTarget.data());
        QApplicationPrivate::instance()->widgetGestures[w].pinch = 0;
#ifdef Q_WS_WIN
        qt_widget_private(w)->winSetupGestures();
#endif
    }

    if (newGestureTarget && newGestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(newGestureTarget);
        QApplicationPrivate::instance()->widgetGestures[w].pinch = q;
#ifdef Q_WS_WIN
        qt_widget_private(w)->winSetupGestures();
#endif
    }
    QGesturePrivate::setupGestureTarget(newGestureTarget);
}

/*! \internal */
bool QPinchGesture::event(QEvent *event)
{
    return QObject::event(event);
}

bool QPinchGesture::eventFilter(QObject *receiver, QEvent *event)
{
    Q_D(QPinchGesture);

    if (d->implicitGesture && d->gestureTarget && d->gestureTarget->isWidgetType() &&
        static_cast<QWidget*>(d->gestureTarget.data())->testAttribute(Qt::WA_DontUseStandardGestures))
        return false;

#if defined(Q_WS_WIN) || defined(Q_WS_MAC)
    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
#if defined(Q_WS_WIN)
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
        if (it == qAppPriv->widgetGestures.end())
            return false;
        if (this != it.value().pinch)
            return false;
#endif
        Qt::GestureState nextState = Qt::NoGesture;

        switch(ev->gestureType) {
        case QNativeGestureEvent::GestureBegin:
            // next we might receive the first gesture update event, so we
            // prepare for it.
            d->state = Qt::NoGesture;
            d->totalScaleFactor = d->scaleFactor = d->lastScaleFactor = 1.;
            d->totalRotationAngle = d->rotationAngle = d->lastRotationAngle = 0.;
            d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPointF();
#if defined(Q_WS_WIN)
            d->initialDistance = 0;
            d->lastSequenceId = ev->sequenceId;
#endif
            return false;
        case QNativeGestureEvent::Rotate: {
            d->lastScaleFactor = d->scaleFactor;
            d->lastRotationAngle = d->rotationAngle;
#if defined(Q_WS_MAC)
            d->rotationAngle += ev->percentage;
            nextState = Qt::GestureUpdated;
#elif defined(Q_WS_WIN)
            // This is a workaround for an issue with the native rotation
            // gesture on Windows 7. For some reason the rotation angle in the
            // first WM_GESTURE message in a sequence contains value that is
            // off a little bit and causes the rotating item to "jump", so
            // we just ignore the first WM_GESTURE in every sequence.
            bool windowsRotateWorkaround = false;
            if (!d->lastSequenceId) {
                windowsRotateWorkaround = true;
                d->lastSequenceId = ev->sequenceId;
            }
            if (d->lastSequenceId > 0 && d->lastSequenceId != (ulong)-1 && ev->sequenceId != d->lastSequenceId) {
                // this is the first WM_GESTURE message in a sequence.
                d->totalRotationAngle += d->rotationAngle;
                windowsRotateWorkaround = true;
                // a magic value to mark that the next WM_GESTURE message is
                // the second message in a sequence and we should clear the
                // lastRotationAngle
                d->lastSequenceId = (ulong)-1;
            }
            if (!windowsRotateWorkaround) {
                d->rotationAngle = -1 * GID_ROTATE_ANGLE_FROM_ARGUMENT(ev->argument) * 180. / M_PI;
                if (d->lastSequenceId == (ulong)-1) {
                    // a special case since we need to set the lastRotationAngle to
                    // rotationAngle when the first WM_GESTURE is received in each
                    // sequence.
                    d->lastRotationAngle = d->rotationAngle;
                }
                d->lastSequenceId = ev->sequenceId;
            }
            if (!windowsRotateWorkaround)
                nextState = Qt::GestureUpdated;
#endif
            event->accept();
            break;
        }
        case QNativeGestureEvent::Zoom:
            d->lastRotationAngle = d->rotationAngle;
            d->lastScaleFactor = d->scaleFactor;
#if defined(Q_WS_WIN)
            if (d->initialDistance != 0) {
                int distance = int(qint64(ev->argument));
                if (d->lastSequenceId && ev->sequenceId != d->lastSequenceId) {
                    d->totalScaleFactor *= d->scaleFactor;
                    d->initialDistance = int(qint64(ev->argument));
                    d->lastScaleFactor = d->scaleFactor = (qreal) distance / d->initialDistance;
                } else {
                    d->scaleFactor = (qreal) distance / d->initialDistance;
                }
                d->lastSequenceId = ev->sequenceId;
            } else {
                d->initialDistance = int(qint64(ev->argument));
            }
#elif defined(Q_WS_MAC)
            d->scaleFactor += ev->percentage;
#endif
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::GestureEnd:
            if (state() == Qt::NoGesture)
                return false; // some other gesture has ended
            nextState = Qt::GestureFinished;
            break;
        default:
            return false;
        }
        if (d->startCenterPoint.isNull())
            d->startCenterPoint = d->centerPoint;
        d->lastCenterPoint = d->centerPoint;
        d->centerPoint = static_cast<QWidget*>(receiver)->mapFromGlobal(ev->position);
        updateState(nextState);
        return true;
    }
#endif
    return QGesture::eventFilter(receiver, event);
}


/*! \internal */
bool QPinchGesture::filterEvent(QEvent *event)
{
    Q_D(QPinchGesture);

    if (d->implicitGesture && d->gestureTarget && d->gestureTarget->isWidgetType() &&
        static_cast<QWidget*>(d->gestureTarget.data())->testAttribute(Qt::WA_DontUseStandardGestures))
        return false;

    Q_UNUSED(event);
    return false;
}

/*! \internal */
void QPinchGesture::reset()
{
    Q_D(QPinchGesture);
    d->totalScaleFactor = d->scaleFactor = d->lastScaleFactor = 1.;
    d->totalRotationAngle = d->rotationAngle = d->lastRotationAngle = 0.;
    d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPointF();
    QGesture::reset();
}

/*!
    \property QPinchGesture::totalScaleFactor

    Specifies a total scale factor of the pinch gesture since the gesture
    started.
*/
qreal QPinchGesture::totalScaleFactor() const
{
    Q_D(const QPinchGesture);
    return d->totalScaleFactor * d->scaleFactor;
}

/*!
    \property QPinchGesture::scaleFactor

    Specifies a scale factor of the pinch gesture.

    If the gesture consists of several pinch sequences (i.e. zoom and rotate
    sequences), then this property specifies the scale factor in the current
    sequence. When pinching changes the rotation angle only, the value of this
    property is 1.
*/
qreal QPinchGesture::scaleFactor() const
{
    return d_func()->scaleFactor;
}

/*!
    \property QPinchGesture::lastScaleFactor

    Specifies a previous scale factor of the pinch gesture.
*/
qreal QPinchGesture::lastScaleFactor() const
{
    return d_func()->lastScaleFactor;
}

/*!
    \property QPinchGesture::totalRotationAngle

    Specifies a total rotation angle of the gesture since the gesture started.

    The angle is specified in degrees.
*/
qreal QPinchGesture::totalRotationAngle() const
{
    Q_D(const QPinchGesture);
    return d->totalRotationAngle + d->rotationAngle;
}

/*!
    \property QPinchGesture::rotationAngle

    Specifies a rotation angle of the gesture.

    If the gesture consists of several pinch sequences (i.e. zoom and rotate
    sequences), then this property specifies the rotation angle in the current
    sequence. When pinching changes the scale factor only, the value of this
    property is 0.

    The angle is specified in degrees.
*/
qreal QPinchGesture::rotationAngle() const
{
    return d_func()->rotationAngle;
}

/*!
    \property QPinchGesture::lastRotationAngle

    Specifies a previous rotation angle of the gesture.

    The angle is specified in degrees.
*/
qreal QPinchGesture::lastRotationAngle() const
{
    return d_func()->lastRotationAngle;
}

/*!
    \property QPinchGesture::centerPoint

    Specifies a center point of the gesture. The point can be used as a center
    point that the object is rotated around.
*/
QPointF QPinchGesture::centerPoint() const
{
    return d_func()->centerPoint;
}

/*!
    \property QPinchGesture::lastCenterPoint

    Specifies a previous center point of the gesture.
*/
QPointF QPinchGesture::lastCenterPoint() const
{
    return d_func()->lastCenterPoint;
}

/*!
    \property QPinchGesture::startCenterPoint

    Specifies an initial center point of the gesture. Difference between the
    startCenterPoint and the centerPoint is the distance at which pinching
    fingers has shifted.
*/
QPointF QPinchGesture::startCenterPoint() const
{
    return d_func()->startCenterPoint;
}

//////////////////////////////////////////////////////////////////////////////

/*!
    \class QSwipeGesture
    \since 4.6

    \brief The QSwipeGesture class represents a swipe gesture,
    providing additional information related to swiping.
*/

/*!
  Creates a new Swipe gesture handler object and marks it as a
  child of \a parent. The swipe gesture handler watches \a
  gestureTarget for its events.

  On some platform like Windows it's necessary to provide a non-null
  widget as \a parent to get native gesture support.
*/
QSwipeGesture::QSwipeGesture(QWidget *gestureTarget, QObject *parent)
    : QGesture(*new QSwipeGesturePrivate, gestureTarget, parent)
{
    setObjectName(QLatin1String("QSwipeGesture"));
}

void QSwipeGesturePrivate::setupGestureTarget(QObject *newGestureTarget)
{
    Q_Q(QSwipeGesture);
    if (gestureTarget && gestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(gestureTarget.data());
        QApplicationPrivate::instance()->widgetGestures[w].swipe = 0;
#if defined(Q_WS_WIN)
        qt_widget_private(w)->winSetupGestures();
#endif
    }

    if (newGestureTarget && newGestureTarget->isWidgetType()) {
        QWidget *w = static_cast<QWidget*>(newGestureTarget);
        QApplicationPrivate::instance()->widgetGestures[w].swipe = q;
#if defined(Q_WS_WIN)
        qt_widget_private(w)->winSetupGestures();
#endif
    }
    QGesturePrivate::setupGestureTarget(newGestureTarget);
}

/*!
  \property QSwipeGesture::swipeAngle

  Holds the angle of the swipe gesture, 0..360.
*/
qreal QSwipeGesture::swipeAngle() const
{
    Q_D(const QSwipeGesture);
    return d->swipeAngle;
}

/*!
  \property QSwipeGesture::horizontalDirection

  Holds the direction for the horizontal component of the swipe
  gesture, SwipeDirection::Left or SwipeDirection::Right.
  SwipeDirection::NoDirection if there is no horizontal
  component to the swipe gesture.
*/
QSwipeGesture::SwipeDirection QSwipeGesture::horizontalDirection() const
{
    Q_D(const QSwipeGesture);
    if (d->swipeAngle < 0 || d->swipeAngle == 90 || d->swipeAngle == 270)
        return QSwipeGesture::NoDirection;
    else if (d->swipeAngle < 90 || d->swipeAngle > 270)
        return QSwipeGesture::Right;
    else
        return QSwipeGesture::Left;
}


/*!
  \property QSwipeGesture::verticalDirection

  Holds the direction for the vertical component of the swipe
  gesture, SwipeDirection::Down or SwipeDirection::Up.
  SwipeDirection::NoDirection if there is no vertical
  component to the swipe gesture.
*/
QSwipeGesture::SwipeDirection QSwipeGesture::verticalDirection() const
{
    Q_D(const QSwipeGesture);
    if (d->swipeAngle <= 0 || d->swipeAngle == 180)
        return QSwipeGesture::NoDirection;
    else if (d->swipeAngle < 180)
        return QSwipeGesture::Up;
    else
        return QSwipeGesture::Down;
}

bool QSwipeGesture::eventFilter(QObject *receiver, QEvent *event)
{
    Q_D(QSwipeGesture);
    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
        switch (ev->gestureType) {
        case QNativeGestureEvent::Swipe:
            d->swipeAngle = ev->angle;
            updateState(Qt::GestureStarted);
            updateState(Qt::GestureUpdated);
            updateState(Qt::GestureFinished);
            break;
        default:
            return false;
        }
        return true;
    }
    return QGesture::eventFilter(receiver, event);
}

/*! \internal */
bool QSwipeGesture::filterEvent(QEvent *)
{
    return false;
}

/*! \internal */
void QSwipeGesture::reset()
{
    Q_D(QSwipeGesture);
    d->swipeAngle = -1;
    QGesture::reset();
}

QT_END_NAMESPACE

#include "moc_qstandardgestures.cpp"