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#include "qquickhoverhandler_p.h"

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(lcHoverHandler, "qt.quick.handler.hover")

/*!
    \qmltype HoverHandler
    \instantiates QQuickHoverHandler
    \inqmlmodule QtQuick
    \ingroup qtquick-input-handlers
    \brief Handler for mouse and tablet hover.

    HoverHandler detects a hovering cursor.  Since touchscreens don't generally
    offer hover events, in practice it detects a hovering mouse or tablet stylus.

    \sa MouseArea
*/

QQuickHoverHandler::QQuickHoverHandler(QQuickItem *parent)
    : QQuickSinglePointHandler(parent)
{
    // Rule out the touchscreen for now (can be overridden in QML in case a hover-detecting touchscreen exists)
    setAcceptedDevices(static_cast<QQuickPointerDevice::DeviceType>(
        static_cast<int>(QQuickPointerDevice::AllDevices) ^ static_cast<int>(QQuickPointerDevice::TouchScreen)));
}

QQuickHoverHandler::~QQuickHoverHandler()
{
    if (auto parent = parentItem())
        QQuickItemPrivate::get(parent)->setHasHoverInChild(false);
}

void QQuickHoverHandler::componentComplete()
{
    parentItem()->setAcceptHoverEvents(true);
    QQuickItemPrivate::get(parentItem())->setHasHoverInChild(true);
}

bool QQuickHoverHandler::wantsPointerEvent(QQuickPointerEvent *event)
{
    QQuickEventPoint *point = event->point(0);
    if (QQuickPointerDeviceHandler::wantsPointerEvent(event) && wantsEventPoint(point) && parentContains(point)) {
        // assume this is a mouse event, so there's only one point
        setPointId(point->pointId());
        return true;
    }
    setHovered(false);
    return false;
}

void QQuickHoverHandler::handleEventPoint(QQuickEventPoint *point)
{
    setHovered(true);
    setPassiveGrab(point);
}

void QQuickHoverHandler::setHovered(bool hovered)
{
    if (m_hovered != hovered) {
        qCDebug(lcHoverHandler) << objectName() << "hovered" << m_hovered << "->" << hovered;
        m_hovered = hovered;
        emit hoveredChanged();
    }
}

QT_END_NAMESPACE