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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>

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 = QSize();
        } else {
            d->lastOffset = QSize(ev->position.x() - d->lastPosition.x(),
                                  ev->position.y() - d->lastPosition.y());
            d->totalOffset += d->lastOffset;
        }
        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 = 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 =
                        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->lastOffset;
            }
            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 =
                    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->lastOffset;
            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 = QSizeF(dist.x(), dist.y());
                d->totalOffset += d->lastOffset;
                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 = 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 since the last time the gesture was
    triggered.
*/
QSizeF QPanGesture::lastOffset() const
{
    Q_D(const QPanGesture);
    return d->lastOffset;
}

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

/*!
    \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->scaleFactor = d->lastScaleFactor = 1;
            d->rotationAngle = d->lastRotationAngle = 0;
            d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPointF();
#if defined(Q_WS_WIN)
            d->initialDistance = 0;
#endif
            return false;
        case QNativeGestureEvent::Rotate:
            d->scaleFactor = 0;
            d->lastRotationAngle = d->rotationAngle;
#if defined(Q_WS_WIN)
            d->rotationAngle = -1 * GID_ROTATE_ANGLE_FROM_ARGUMENT(ev->argument);
#elif defined(Q_WS_MAC)
            d->rotationAngle = ev->percentage;
#endif
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::Zoom:
            d->rotationAngle = 0;
#if defined(Q_WS_WIN)
            if (d->initialDistance != 0) {
                d->lastScaleFactor = d->scaleFactor;
                int distance = int(qint64(ev->argument));
                d->scaleFactor = (qreal) distance / d->initialDistance;
            } else {
                d->initialDistance = int(qint64(ev->argument));
            }
#elif defined(Q_WS_MAC)
            d->lastScaleFactor = d->scaleFactor;
            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->scaleFactor = d->lastScaleFactor = 0;
    d->rotationAngle = d->lastRotationAngle = 0;
    d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPointF();
    QGesture::reset();
}

/*!
    \property QPinchGesture::scaleFactor

    Specifies a scale factor of the pinch gesture.
*/
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::rotationAngle

    Specifies a rotation angle of the gesture.
*/
qreal QPinchGesture::rotationAngle() const
{
    return d_func()->rotationAngle;
}

/*!
    \property QPinchGesture::lastRotationAngle

    Specifies a previous rotation angle of the gesture.
*/
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"