\brief The HbTapAndHoldGesture class provides support for receiving

    tap-and-hold gestures.

    HbTapAndHoldGesture is an extension to Qt standard QTapAndHoldGesture.

    It is optimized for mobile touch screens, and also supports recognition

    of mouse events for development purposes. It also gives information about

    the tap-and-hold gesture position directly in scene coordinates, removing

    any need for manual conversions from the screen (global) coordinates

    offered by QTapAndHoldGesture.

    Use HbTapAndHoldGesture for a custom widget that is only interested in

    the tap-and-hold (long tap) gesture. If you want your custom widget to

    receive both short and long taps, use HbTapGesture instead, since it

    supports both.

    \section _usecases_hbtapandholdgesture Using the HbTapAndHoldGesture class

    This example shows how to make a custom widget recognize the tap-and-hold

    gesture. The custom widget in the example derives from HbWidget.

    <ol>

    <li>

    Register for tap-and-hold gestures by using the base class function

    QGraphicsObject::grabGesture(). QGraphicsObject::grabGesture() can be

    called several times with different arguments, if the widget is

    interested in other gesture types as well.

    \code

    // This widget is interested in tap-and-hold and pan gestures.

    grabGesture(Qt::TapAndHoldGesture);

    grabGesture(Qt::PanGesture);

    \endcode

    </li>

    <li>

    Reimplement HbWidgetBase::gestureEvent() to handle gestures that are

    meaningful for your custom widget.

    \code

    void MyWidget::gestureEvent(QGestureEvent *event)

    {

        if (HbTapAndHoldGesture *tapAndHold =

            qobject_cast<HbTapAndHoldGesture *>

                (event->gesture(Qt::TapAndHoldGesture))) {

            switch (tapAndHold->state()) {

            case Qt::GestureStarted:

                // Visualize the active state of the widget.

                break;

            // No GestureUpdated events are sent for this gesture type,

            // so no handling is needed for those

            case Qt::GestureCanceled:

                // Visualize the non-active state of the widget.

                break;

            case Qt::GestureFinished:              

                // Visualize the non-active state of the widget.

                // Emit a long tap signal.              

                break;

            default:

                break;

            }           

        }

        // Handle other gesture types that have been grabbed. There may be

        // several, since all gestures that are active at the same moment

        // are sent within the same gesture event.

        if (HbPanGesture *pan = qobject_cast<HbPanGesture *>

            (event->gesture(Qt::PanGesture))) {

            // handle the pan gesture

        }

    }   

    \endcode

    </li>

    </ol>

    \sa HbTapGesture, QTapAndHoldGesture

    Constructor.

    Constructor required by the shared d-pointer paradigm.

    Destructor.

    Returns the current position of the gesture in scene coordinates.

    \sa setScenePosition(), QTapAndHoldGesture::position()

/*!

    Sets the current position of the gesture in scene coordinates.

    This function is used by the framework gesture recognition logic,

    and it should not be used by the widget receiving the gesture.

    \sa scenePosition(), QTapAndHoldGesture::setPosition()

*/