katie/src/gui/graphicsview/qgraphicssceneevent.cpp

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

/*!
    \class QGraphicsSceneEvent
    \brief The QGraphicsSceneEvent class provides a base class for all
    graphics view related events.
    \since 4.2
    \ingroup graphicsview-api

    When a QGraphicsView receives Qt mouse, keyboard, and drag and
    drop events (QMouseEvent, QKeyEvent, QDragEvent, etc.), it
    translates them into instances of QGraphicsSceneEvent subclasses
    and forwards them to the QGraphicsScene it displays. The scene
    then forwards the events to the relevant items.

    For example, when a QGraphicsView receives a QMouseEvent of type
    MousePress as a response to a user click, the view sends a
    QGraphicsSceneMouseEvent of type GraphicsSceneMousePress to the
    underlying QGraphicsScene through its
    \l{QGraphicsScene::}{mousePressEvent()} function. The default
    QGraphicsScene::mousePressEvent() implementation determines which
    item was clicked and forwards the event to
    QGraphicsItem::mousePressEvent().

    \omit ### Beskrive widget() \endomit

    Subclasses such as QGraphicsSceneMouseEvent and
    QGraphicsSceneContextMenuEvent provide the coordinates from the
    original QEvent in screen, scene, and item coordinates (see
    \l{QGraphicsSceneMouseEvent::}{screenPos()},
    \l{QGraphicsSceneMouseEvent::}{scenePos()}, and
    \l{QGraphicsSceneMouseEvent::}{pos()}). The item coordinates are
    set by the QGraphicsScene before it forwards the event to the
    event to a QGraphicsItem. The mouse events also add the
    possibility to retrieve the coordinates from the last event
    received by the view (see
    \l{QGraphicsSceneMouseEvent::}{lastScreenPos()},
    \l{QGraphicsSceneMouseEvent::}{lastScenePos()}, and
    \l{QGraphicsSceneMouseEvent::}{lastPos()}).

    \sa QEvent
*/

/*!
    \class QGraphicsSceneMouseEvent
    \brief The QGraphicsSceneMouseEvent class provides mouse events
           in the graphics view framework.
    \since 4.2
    \ingroup graphicsview-api

    When a QGraphicsView receives a QMouseEvent, it translates it to a
    QGraphicsSceneMouseEvent. The event is then forwarded to the
    QGraphicsScene associated with the view. If the event is not
    handled by the scene, the view may use it, e.g., for the
    \l{QGraphicsView::}{DragMode}.

    In addition to containing the item, scene, and screen coordinates
    of the event (as pos(), scenePos(), and screenPos()), mouse
    events also contain the coordinates of the previous mouse
    event received by the view. These can be retrieved with
    lastPos(), lastScreenPos(), and lastScenePos().

    \sa QGraphicsSceneContextMenuEvent,
        QGraphicsSceneHoverEvent, QGraphicsSceneWheelEvent,
        QMouseEvent
*/

/*!
    \class QGraphicsSceneWheelEvent
    \brief The QGraphicsSceneWheelEvent class provides wheel events
           in the graphics view framework.
    \brief The QGraphicsSceneWheelEvent class provides wheel events in the
    graphics view framework.
    \since 4.2
    \ingroup graphicsview-api

    \l{QWheelEvent}{QWheelEvent}s received by a QGraphicsView are translated
    into QGraphicsSceneWheelEvents; it translates the QWheelEvent::globalPos()
    into item, scene, and screen coordinates (pos(), scenePos(), and
    screenPos()).

    \sa QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent,
    QGraphicsSceneHoverEvent, QWheelEvent
*/

/*!
    \class QGraphicsSceneContextMenuEvent
    \brief The QGraphicsSceneContextMenuEvent class provides context
           menu events in the graphics view framework.
    \since 4.2
    \ingroup graphicsview-api

    A QContextMenuEvent received by a QGraphicsView is translated
    into a QGraphicsSceneContextMenuEvent. The
    QContextMenuEvent::globalPos() is translated into item, scene, and
    screen coordinates (pos(), scenePos(), and screenPos()).

    \sa QGraphicsSceneMouseEvent, QGraphicsSceneWheelEvent,
    QContextMenuEvent
*/

/*!
    \enum QGraphicsSceneContextMenuEvent::Reason

    This enum describes the reason why the context event was sent.

    \value Mouse The mouse caused the event to be sent. On most
    platforms, this means the right mouse button was clicked.

    \value Keyboard The keyboard caused this event to be sent. On
    Windows and Mac OS X, this means the menu button was pressed.

    \value Other The event was sent by some other means (i.e. not
    by the mouse or keyboard).
*/

/*!
    \class QGraphicsSceneHoverEvent
    \brief The QGraphicsSceneHoverEvent class provides hover events
           in the graphics view framework.
    \since 4.2
    \ingroup graphicsview-api

    When a QGraphicsView receives a QHoverEvent event, it translates
    it into QGraphicsSceneHoverEvent. The event is then forwarded to
    the QGraphicsScene associated with the view.

    \sa QGraphicsSceneMouseEvent, QGraphicsSceneContextMenuEvent,
        QGraphicsSceneWheelEvent, QHoverEvent
*/

/*!
    \class QGraphicsSceneHelpEvent
    \brief The QGraphicsSceneHelpEvent class provides events when a
           tooltip is requested.
    \since 4.2
    \ingroup graphicsview-api

    When a QGraphicsView receives a QEvent of type
    QEvent::ToolTip, it creates a QGraphicsSceneHelpEvent, which is
    forwarded to the scene. You can set a tooltip on a QGraphicsItem
    with \l{QGraphicsItem::}{setToolTip()}; by default QGraphicsScene
    displays the tooltip of the QGraphicsItem with the highest
    z-value (i.e, the top-most item) under the mouse position.

    QGraphicsView does not forward events when
    \l{QWhatsThis}{"What's This"} and \l{QStatusTipEvent}{status tip}
    help is requested. If you need this, you can reimplement
    QGraphicsView::viewportEvent() and forward QStatusTipEvent
    events and \l{QEvent}{QEvents} of type QEvent::WhatsThis to the
    scene.

    \sa QEvent
*/

/*!
    \class QGraphicsSceneDragDropEvent
    \brief The QGraphicsSceneDragDropEvent class provides events for
           drag and drop in the graphics view framework.
    \since 4.2
    \ingroup graphicsview-api

    QGraphicsView inherits the drag and drop functionality provided
    by QWidget. When it receives a drag and drop event, it translates
    it to a QGraphicsSceneDragDropEvent.

    QGraphicsSceneDragDropEvent stores events of type
    GraphicsSceneDragEnter, GraphicsSceneDragLeave,
    GraphicsSceneDragMove, or GraphicsSceneDrop.

    QGraphicsSceneDragDropEvent contains the position of the mouse
    cursor in both item, scene, and screen coordinates; this can be
    retrieved with pos(), scenePos(), and screenPos().

    The scene sends the event to the first QGraphicsItem under the
    mouse cursor that accepts drops; a graphics item is set to accept
    drops with \l{QGraphicsItem::}{setAcceptDrops()}.
*/

/*!
    \class QGraphicsSceneResizeEvent
    \brief The QGraphicsSceneResizeEvent class provides events for widget
    resizing in the graphics view framework.
    \since 4.4
    \ingroup graphicsview-api

    A QGraphicsWidget sends itself a QGraphicsSceneResizeEvent immediately
    when its geometry changes.

    It's similar to QResizeEvent, but its sizes, oldSize() and newSize(), use
    QSizeF instead of QSize.

    \sa QGraphicsWidget::setGeometry(), QGraphicsWidget::resize()
*/

/*!
    \class QGraphicsSceneMoveEvent
    \brief The QGraphicsSceneMoveEvent class provides events for widget
    moving in the graphics view framework.
    \since 4.4
    \ingroup graphicsview-api

    A QGraphicsWidget sends itself a QGraphicsSceneMoveEvent immediately when
    its local position changes. The delivery is implemented as part of
    QGraphicsItem::itemChange().

    It's similar to QMoveEvent, but its positions, oldPos() and newPos(), use
    QPointF instead of QPoint.

    \sa QGraphicsItem::setPos(), QGraphicsItem::ItemPositionChange,
    QGraphicsItem::ItemPositionHasChanged
*/

#include "qgraphicssceneevent.h"

#ifndef QT_NO_GRAPHICSVIEW

#ifndef QT_NO_DEBUG
#include <QtCore/qdebug.h>
#endif
#include <QtCore/qmap.h>
#include <QtCore/qpoint.h>
#include <QtCore/qsize.h>
#include <QtCore/qstring.h>
#include "qgraphicsview.h"
#include "qgraphicsitem.h"
#include <QtGui/qgesture.h>
#include <qevent_p.h>

QT_BEGIN_NAMESPACE

class QGraphicsSceneEventPrivate
{
public:
    inline QGraphicsSceneEventPrivate()
        : widget(0),
          q_ptr(0)
    { }

    inline virtual ~QGraphicsSceneEventPrivate()
    { }

    QWidget *widget;
    QGraphicsSceneEvent *q_ptr;
};

/*!
    \internal

    Constructs a generic graphics scene event of the specified \a type.
*/
QGraphicsSceneEvent::QGraphicsSceneEvent(Type type)
    : QEvent(type), d_ptr(new QGraphicsSceneEventPrivate)
{
    d_ptr->q_ptr = this;
}

/*!
    \internal

    Constructs a generic graphics scene event.
*/
QGraphicsSceneEvent::QGraphicsSceneEvent(QGraphicsSceneEventPrivate &dd, Type type)
    : QEvent(type), d_ptr(&dd)
{
    d_ptr->q_ptr = this;
}

/*!
    Destroys the event.
*/
QGraphicsSceneEvent::~QGraphicsSceneEvent()
{
}

/*!
    Returns the widget where the event originated, or 0 if the event
    originates from another application.
*/
QWidget *QGraphicsSceneEvent::widget() const
{
    return d_ptr->widget;
}

/*!
    \internal

    Sets the \a widget related to this event.

    \sa widget()
*/
void QGraphicsSceneEvent::setWidget(QWidget *widget)
{
    d_ptr->widget = widget;
}

class QGraphicsSceneMouseEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneMouseEvent)
public:
    inline QGraphicsSceneMouseEventPrivate()
        : button(Qt::NoButton),
          buttons(0), modifiers(0)
    { }

    QPointF pos;
    QPointF scenePos;
    QPoint screenPos;
    QPointF lastPos;
    QPointF lastScenePos;
    QPoint lastScreenPos;
    QMap<Qt::MouseButton, QPointF> buttonDownPos;
    QMap<Qt::MouseButton, QPointF> buttonDownScenePos;
    QMap<Qt::MouseButton, QPoint> buttonDownScreenPos;
    Qt::MouseButton button;
    Qt::MouseButtons buttons;
    Qt::KeyboardModifiers modifiers;
};

/*!
    \internal

    Constructs a generic graphics scene mouse event of the specified \a type.
*/
QGraphicsSceneMouseEvent::QGraphicsSceneMouseEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneMouseEventPrivate, type)
{
}

/*!
    Destroys the event.
*/
QGraphicsSceneMouseEvent::~QGraphicsSceneMouseEvent()
{
}

/*!
    Returns the mouse cursor position in item coordinates.

    \sa scenePos(), screenPos(), lastPos()
*/
QPointF QGraphicsSceneMouseEvent::pos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->pos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->pos = pos;
}

/*!
    Returns the mouse cursor position in scene coordinates.

    \sa pos(), screenPos(), lastScenePos()
*/
QPointF QGraphicsSceneMouseEvent::scenePos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->scenePos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->scenePos = pos;
}

/*!
    Returns the mouse cursor position in screen coordinates.

    \sa pos(), scenePos(), lastScreenPos()
*/
QPoint QGraphicsSceneMouseEvent::screenPos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->screenPos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->screenPos = pos;
}

/*!
    Returns the mouse cursor position in item coordinates where the specified
    \a button was clicked.

    \sa buttonDownScenePos(), buttonDownScreenPos(), pos()
*/
QPointF QGraphicsSceneMouseEvent::buttonDownPos(Qt::MouseButton button) const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->buttonDownPos.value(button);
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setButtonDownPos(Qt::MouseButton button, const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->buttonDownPos.insert(button, pos);
}

/*!
    Returns the mouse cursor position in scene coordinates where the
    specified \a button was clicked.

    \sa buttonDownPos(), buttonDownScreenPos(), scenePos()
*/
QPointF QGraphicsSceneMouseEvent::buttonDownScenePos(Qt::MouseButton button) const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->buttonDownScenePos.value(button);
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setButtonDownScenePos(Qt::MouseButton button, const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->buttonDownScenePos.insert(button, pos);
}

/*!
    Returns the mouse cursor position in screen coordinates where the
    specified \a button was clicked.

    \sa screenPos(), buttonDownPos(), buttonDownScenePos()
*/
QPoint QGraphicsSceneMouseEvent::buttonDownScreenPos(Qt::MouseButton button) const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->buttonDownScreenPos.value(button);
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setButtonDownScreenPos(Qt::MouseButton button, const QPoint &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->buttonDownScreenPos.insert(button, pos);
}

/*!
    Returns the last recorded mouse cursor position in item
    coordinates.

    \sa lastScenePos(), lastScreenPos(), pos()
*/
QPointF QGraphicsSceneMouseEvent::lastPos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->lastPos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setLastPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->lastPos = pos;
}

/*!
    Returns the last recorded mouse cursor position in scene
    coordinates. The last recorded position is the position of
    the previous mouse event received by the view that created
    the event.

    \sa lastPos(), lastScreenPos(), scenePos()
*/
QPointF QGraphicsSceneMouseEvent::lastScenePos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->lastScenePos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setLastScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->lastScenePos = pos;
}

/*!
    Returns the last recorded mouse cursor position in screen
    coordinates. The last recorded position is the position of
    the previous mouse event received by the view that created
    the event.

    \sa lastPos(), lastScenePos(), screenPos()
*/
QPoint QGraphicsSceneMouseEvent::lastScreenPos() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->lastScreenPos;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setLastScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->lastScreenPos = pos;
}

/*!
    Returns the combination of mouse buttons that were pressed at the
    time the event was sent.

    \sa button(), modifiers()
*/
Qt::MouseButtons QGraphicsSceneMouseEvent::buttons() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->buttons;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setButtons(Qt::MouseButtons buttons)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->buttons = buttons;
}

/*!
    Returns the mouse button (if any) that caused the event.

    \sa buttons(), modifiers()
*/
Qt::MouseButton QGraphicsSceneMouseEvent::button() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->button;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setButton(Qt::MouseButton button)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->button = button;
}

/*!
    Returns the keyboard modifiers in use at the time the event was
    sent.

    \sa buttons(), button()
*/
Qt::KeyboardModifiers QGraphicsSceneMouseEvent::modifiers() const
{
    Q_D(const QGraphicsSceneMouseEvent);
    return d->modifiers;
}

/*!
    \internal
*/
void QGraphicsSceneMouseEvent::setModifiers(Qt::KeyboardModifiers modifiers)
{
    Q_D(QGraphicsSceneMouseEvent);
    d->modifiers = modifiers;
}

class QGraphicsSceneWheelEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneWheelEvent)
public:
    inline QGraphicsSceneWheelEventPrivate()
        : buttons(0), modifiers(0), delta(0), orientation(Qt::Horizontal)
    { }

    QPointF pos;
    QPointF scenePos;
    QPoint screenPos;
    Qt::MouseButtons buttons;
    Qt::KeyboardModifiers modifiers;
    int delta;
    Qt::Orientation orientation;
};

/*!
    \internal

    Constructs a QGraphicsSceneWheelEvent of type \a type, which
    is always QEvent::GraphicsSceneWheel.
*/
QGraphicsSceneWheelEvent::QGraphicsSceneWheelEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneWheelEventPrivate, type)
{
}

/*!
    Destroys the QGraphicsSceneWheelEvent.
*/
QGraphicsSceneWheelEvent::~QGraphicsSceneWheelEvent()
{
}

/*!
    Returns the position of the cursor in item coordinates when the
    wheel event occurred.

    \sa scenePos(), screenPos()
*/
QPointF QGraphicsSceneWheelEvent::pos() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->pos;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->pos = pos;
}

/*!
    Returns the position of the cursor in scene coordinates when the wheel
    event occurred.

    \sa pos(), screenPos()
*/
QPointF QGraphicsSceneWheelEvent::scenePos() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->scenePos;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->scenePos = pos;
}

/*!
    Returns the position of the cursor in screen coordinates when the wheel
    event occurred.

    \sa pos(), scenePos()
*/
QPoint QGraphicsSceneWheelEvent::screenPos() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->screenPos;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->screenPos = pos;
}

/*!
    Returns the mouse buttons that were pressed when the wheel event occurred.

    \sa modifiers()
*/
Qt::MouseButtons QGraphicsSceneWheelEvent::buttons() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->buttons;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setButtons(Qt::MouseButtons buttons)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->buttons = buttons;
}

/*!
    Returns the keyboard modifiers that were active when the wheel event
    occurred.

    \sa buttons()
*/
Qt::KeyboardModifiers QGraphicsSceneWheelEvent::modifiers() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->modifiers;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setModifiers(Qt::KeyboardModifiers modifiers)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->modifiers = modifiers;
}

/*!
    Returns the distance that the wheel is rotated, in eighths (1/8s)
    of a degree. A positive value indicates that the wheel was
    rotated forwards away from the user; a negative value indicates
    that the wheel was rotated backwards toward the user.

    Most mouse types work in steps of 15 degrees, in which case the delta
    value is a multiple of 120 (== 15 * 8).
*/
int QGraphicsSceneWheelEvent::delta() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->delta;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setDelta(int delta)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->delta = delta;
}

/*!
    Returns the wheel orientation.
*/
Qt::Orientation QGraphicsSceneWheelEvent::orientation() const
{
    Q_D(const QGraphicsSceneWheelEvent);
    return d->orientation;
}

/*!
    \internal
*/
void QGraphicsSceneWheelEvent::setOrientation(Qt::Orientation orientation)
{
    Q_D(QGraphicsSceneWheelEvent);
    d->orientation = orientation;
}

class QGraphicsSceneContextMenuEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneContextMenuEvent)
        public:
    inline QGraphicsSceneContextMenuEventPrivate()
        : modifiers(0), reason(QGraphicsSceneContextMenuEvent::Other)
        { }

    QPointF pos;
    QPointF scenePos;
    QPoint screenPos;
    Qt::KeyboardModifiers modifiers;
    QGraphicsSceneContextMenuEvent::Reason reason;
};

/*!
    \internal

    Constructs a graphics scene context menu event of the specified \a type.
*/
QGraphicsSceneContextMenuEvent::QGraphicsSceneContextMenuEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneContextMenuEventPrivate, type)
{
}

/*!
    Destroys the event.
*/
QGraphicsSceneContextMenuEvent::~QGraphicsSceneContextMenuEvent()
{
}

/*!
    Returns the position of the mouse cursor in item coordinates at the moment
    the context menu was requested.

    \sa scenePos(), screenPos()
*/
QPointF QGraphicsSceneContextMenuEvent::pos() const
{
    Q_D(const QGraphicsSceneContextMenuEvent);
    return d->pos;
}

/*!
    \fn void QGraphicsSceneContextMenuEvent::setPos(const QPointF &point)
    \internal

    Sets the position associated with the context menu to the given \a point
    in item coordinates.
*/
void QGraphicsSceneContextMenuEvent::setPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneContextMenuEvent);
    d->pos = pos;
}

/*!
    Returns the position of the mouse cursor in scene coordinates at the moment the
    the context menu was requested.

    \sa pos(), screenPos()
*/
QPointF QGraphicsSceneContextMenuEvent::scenePos() const
{
    Q_D(const QGraphicsSceneContextMenuEvent);
    return d->scenePos;
}

/*!
    \fn void QGraphicsSceneContextMenuEvent::setScenePos(const QPointF &point)
    \internal

    Sets the position associated with the context menu to the given \a point
    in scene coordinates.
*/
void QGraphicsSceneContextMenuEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneContextMenuEvent);
    d->scenePos = pos;
}

/*!
    Returns the position of the mouse cursor in screen coordinates at the moment the
    the context menu was requested.

    \sa pos(), scenePos()
*/
QPoint QGraphicsSceneContextMenuEvent::screenPos() const
{
    Q_D(const QGraphicsSceneContextMenuEvent);
    return d->screenPos;
}

/*!
    \fn void QGraphicsSceneContextMenuEvent::setScreenPos(const QPoint &point)
    \internal

    Sets the position associated with the context menu to the given \a point
    in screen coordinates.
*/
void QGraphicsSceneContextMenuEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneContextMenuEvent);
    d->screenPos = pos;
}

/*!
    Returns the keyboard modifiers in use when the context menu was requested.
*/
Qt::KeyboardModifiers QGraphicsSceneContextMenuEvent::modifiers() const
{
    Q_D(const QGraphicsSceneContextMenuEvent);
    return d->modifiers;
}

/*!
    \internal

    Sets the keyboard modifiers associated with the context menu to the \a
    modifiers specified.
*/
void QGraphicsSceneContextMenuEvent::setModifiers(Qt::KeyboardModifiers modifiers)
{
    Q_D(QGraphicsSceneContextMenuEvent);
    d->modifiers = modifiers;
}

/*!
    Returns the reason for the context menu event.

    \sa QGraphicsSceneContextMenuEvent::Reason
*/
QGraphicsSceneContextMenuEvent::Reason QGraphicsSceneContextMenuEvent::reason() const
{
    Q_D(const QGraphicsSceneContextMenuEvent);
    return d->reason;
}

/*!
    \internal
    Sets the reason for the context menu event to \a reason.

    \sa reason()
*/
void QGraphicsSceneContextMenuEvent::setReason(Reason reason)
{
    Q_D(QGraphicsSceneContextMenuEvent);
    d->reason = reason;
}

class QGraphicsSceneHoverEventPrivate : public QGraphicsSceneEventPrivate
{
public:
    QPointF pos;
    QPointF scenePos;
    QPoint screenPos;
    QPointF lastPos;
    QPointF lastScenePos;
    QPoint lastScreenPos;
    Qt::KeyboardModifiers modifiers;
};

/*!
    \internal

    Constructs a graphics scene hover event of the specified \a type.
*/
QGraphicsSceneHoverEvent::QGraphicsSceneHoverEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneHoverEventPrivate, type)
{
}

/*!
    Destroys the event.
*/
QGraphicsSceneHoverEvent::~QGraphicsSceneHoverEvent()
{
}

/*!
    Returns the position of the mouse cursor in item coordinates at the moment
    the hover event was sent.

    \sa scenePos(), screenPos()
*/
QPointF QGraphicsSceneHoverEvent::pos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->pos;
}

/*!
    \fn void QGraphicsSceneHoverEvent::setPos(const QPointF &point)
    \internal

    Sets the position associated with the hover event to the given \a point in
    item coordinates.
*/
void QGraphicsSceneHoverEvent::setPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->pos = pos;
}

/*!
    Returns the position of the mouse cursor in scene coordinates at the
    moment the hover event was sent.

    \sa pos(), screenPos()
*/
QPointF QGraphicsSceneHoverEvent::scenePos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->scenePos;
}

/*!
    \fn void QGraphicsSceneHoverEvent::setScenePos(const QPointF &point)
    \internal

    Sets the position associated with the hover event to the given \a point in
    scene coordinates.
*/
void QGraphicsSceneHoverEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->scenePos = pos;
}

/*!
    Returns the position of the mouse cursor in screen coordinates at the
    moment the hover event was sent.

    \sa pos(), scenePos()
*/
QPoint QGraphicsSceneHoverEvent::screenPos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->screenPos;
}

/*!
    \fn void QGraphicsSceneHoverEvent::setScreenPos(const QPoint &point)
    \internal

    Sets the position associated with the hover event to the given \a point in
    screen coordinates.
*/
void QGraphicsSceneHoverEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->screenPos = pos;
}

/*!
    \since 4.4

    Returns the last recorded mouse cursor position in item coordinates.

    \sa lastScenePos(), lastScreenPos(), pos()
*/
QPointF QGraphicsSceneHoverEvent::lastPos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->lastPos;
}

/*!
    \internal
*/
void QGraphicsSceneHoverEvent::setLastPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->lastPos = pos;
}

/*!
    \since 4.4

    Returns the last recorded, the scene coordinates of the previous mouse or
    hover event received by the view, that created the event mouse cursor
    position in scene coordinates.

    \sa lastPos(), lastScreenPos(), scenePos()
*/
QPointF QGraphicsSceneHoverEvent::lastScenePos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->lastScenePos;
}

/*!
    \internal
*/
void QGraphicsSceneHoverEvent::setLastScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->lastScenePos = pos;
}

/*!
    \since 4.4

    Returns the last recorded mouse cursor position in screen coordinates. The
    last recorded position is the position of the previous mouse or hover
    event received by the view that created the event.

    \sa lastPos(), lastScenePos(), screenPos()
*/
QPoint QGraphicsSceneHoverEvent::lastScreenPos() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->lastScreenPos;
}

/*!
    \internal
*/
void QGraphicsSceneHoverEvent::setLastScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->lastScreenPos = pos;
}

/*!
    \since 4.4

    Returns the keyboard modifiers at the moment the hover event was sent.
*/
Qt::KeyboardModifiers QGraphicsSceneHoverEvent::modifiers() const
{
    Q_D(const QGraphicsSceneHoverEvent);
    return d->modifiers;
}

/*!
    \fn void QGraphicsSceneHoverEvent::setModifiers(Qt::KeyboardModifiers modifiers)
    \internal

    Sets the modifiers for the current hover event to \a modifiers.
*/
void QGraphicsSceneHoverEvent::setModifiers(Qt::KeyboardModifiers modifiers)
{
    Q_D(QGraphicsSceneHoverEvent);
    d->modifiers = modifiers;
}

class QGraphicsSceneHelpEventPrivate : public QGraphicsSceneEventPrivate
{
public:
    QPointF scenePos;
    QPoint screenPos;
};

/*!
    \internal

    Constructs a graphics scene help event of the specified \a type.
*/
QGraphicsSceneHelpEvent::QGraphicsSceneHelpEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneHelpEventPrivate, type)
{
}

/*!
    Destroys the event.
*/
QGraphicsSceneHelpEvent::~QGraphicsSceneHelpEvent()
{
}

/*!
    Returns the position of the mouse cursor in scene coordinates at the
    moment the help event was sent.

    \sa screenPos()
*/
QPointF QGraphicsSceneHelpEvent::scenePos() const
{
    Q_D(const QGraphicsSceneHelpEvent);
    return d->scenePos;
}

/*!
    \fn void QGraphicsSceneHelpEvent::setScenePos(const QPointF &point)
    \internal

    Sets the position associated with the context menu to the given \a point
    in scene coordinates.
*/
void QGraphicsSceneHelpEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneHelpEvent);
    d->scenePos = pos;
}

/*!
    Returns the position of the mouse cursor in screen coordinates at the
    moment the help event was sent.

  \sa scenePos()
*/
QPoint QGraphicsSceneHelpEvent::screenPos() const
{
    Q_D(const QGraphicsSceneHelpEvent);
    return d->screenPos;
}

/*!
    \fn void QGraphicsSceneHelpEvent::setScreenPos(const QPoint &point)
    \internal

    Sets the position associated with the context menu to the given \a point
    in screen coordinates.
*/
void QGraphicsSceneHelpEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneHelpEvent);
    d->screenPos = pos;
}

class QGraphicsSceneDragDropEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneDragDropEvent)
public:
    inline QGraphicsSceneDragDropEventPrivate()
        : source(0), mimeData(0)
    { }

    QPointF pos;
    QPointF scenePos;
    QPoint screenPos;
    Qt::MouseButtons buttons;
    Qt::KeyboardModifiers modifiers;
    Qt::DropActions possibleActions;
    Qt::DropAction proposedAction;
    Qt::DropAction dropAction;
    QWidget *source;
    const QMimeData *mimeData;
};

/*!
    \internal

    Constructs a new QGraphicsSceneDragDropEvent of the
    specified \a type. The type can be either
    QEvent::GraphicsSceneDragEnter, QEvent::GraphicsSceneDragLeave,
    QEvent::GraphicsSceneDragMove, or QEvent::GraphicsSceneDrop.
*/
QGraphicsSceneDragDropEvent::QGraphicsSceneDragDropEvent(Type type)
    : QGraphicsSceneEvent(*new QGraphicsSceneDragDropEventPrivate, type)
{
}

/*!
    Destroys the object.
*/
QGraphicsSceneDragDropEvent::~QGraphicsSceneDragDropEvent()
{
}

/*!
    Returns the mouse position of the event relative to the
    view that sent the event.

    \sa QGraphicsView, screenPos(), scenePos()
*/
QPointF QGraphicsSceneDragDropEvent::pos() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->pos;
}

/*!
    \internal
    Sets the position of the mouse to \a pos; this should be
    relative to the widget that generated the event, which normally
    is a QGraphicsView.

    \sa pos(), setScenePos(), setScreenPos()
*/

void QGraphicsSceneDragDropEvent::setPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->pos = pos;
}

/*!
    Returns the position of the mouse in scene coordinates.

    \sa pos(), screenPos()
*/
QPointF QGraphicsSceneDragDropEvent::scenePos() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->scenePos;
}

/*!
    \internal
    Sets the scene position of the mouse to \a pos.

    \sa scenePos(), setScreenPos(), setPos()
*/
void QGraphicsSceneDragDropEvent::setScenePos(const QPointF &pos)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->scenePos = pos;
}

/*!
    Returns the position of the mouse relative to the screen.

    \sa pos(), scenePos()
*/
QPoint QGraphicsSceneDragDropEvent::screenPos() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->screenPos;
}

/*!
    \internal
    Sets the mouse position relative to the screen to \a pos.

    \sa screenPos(), setScenePos(), setPos()
*/
void QGraphicsSceneDragDropEvent::setScreenPos(const QPoint &pos)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->screenPos = pos;
}

/*!
    Returns a Qt::MouseButtons value indicating which buttons
    were pressed on the mouse when this mouse event was
    generated.

    \sa Qt::MouseButtons
*/
Qt::MouseButtons QGraphicsSceneDragDropEvent::buttons() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->buttons;
}

/*!
    \internal
    Sets the mouse buttons that were pressed when the event was
    created to \a buttons.

    \sa Qt::MouseButtons, buttons()
*/
void QGraphicsSceneDragDropEvent::setButtons(Qt::MouseButtons buttons)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->buttons = buttons;
}

/*!
    Returns the keyboard modifiers that were pressed when the drag
    and drop event was created.

    \sa Qt::KeyboardModifiers
*/
Qt::KeyboardModifiers QGraphicsSceneDragDropEvent::modifiers() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->modifiers;
}

/*!
    \internal
    Sets the keyboard modifiers that were pressed when the event
    was created to \a modifiers.

    \sa Qt::KeyboardModifiers, modifiers()
*/

void QGraphicsSceneDragDropEvent::setModifiers(Qt::KeyboardModifiers modifiers)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->modifiers = modifiers;
}

/*!
    Returns the possible drop actions that the drag and
    drop can result in.

    \sa Qt::DropActions
*/

Qt::DropActions QGraphicsSceneDragDropEvent::possibleActions() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->possibleActions;
}

/*!
    \internal
    Sets the possible drop actions that the drag can
    result in to \a actions.

    \sa Qt::DropActions, possibleActions()
*/
void QGraphicsSceneDragDropEvent::setPossibleActions(Qt::DropActions actions)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->possibleActions = actions;
}

/*!
    Returns the drop action that is proposed, i.e., preferred.
    The action must be one of the possible actions as defined by
    \c possibleActions().

    \sa Qt::DropAction, possibleActions()
*/

Qt::DropAction QGraphicsSceneDragDropEvent::proposedAction() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->proposedAction;
}

/*!
    \internal
    Sets the proposed action to \a action. The proposed action
    is a Qt::DropAction that is one of the possible actions as
    given by \c possibleActions().

    \sa proposedAction(), Qt::DropAction, possibleActions()
*/

void QGraphicsSceneDragDropEvent::setProposedAction(Qt::DropAction action)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->proposedAction = action;
}

/*!
    Sets the proposed action as accepted, i.e, the drop action
    is set to the proposed action. This is equal to:

    \snippet doc/src/snippets/code/src_gui_graphicsview_qgraphicssceneevent.cpp 0

    When using this function, one should not call \c accept().

    \sa dropAction(), setDropAction(), proposedAction()
*/

void QGraphicsSceneDragDropEvent::acceptProposedAction()
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->dropAction = d->proposedAction;
}

/*!
    Returns the action that was performed in this drag and drop.
    This should be set by the receiver of the drop and is
    returned by QDrag::exec().

    \sa setDropAction(), acceptProposedAction()
*/

Qt::DropAction QGraphicsSceneDragDropEvent::dropAction() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->dropAction;
}

/*!
    This function lets the receiver of the drop set the drop
    action that was performed to \a action, which should be one
    of the
    \l{QGraphicsSceneDragDropEvent::possibleActions()}{possible
    actions}. Call \c accept() in stead of \c
    acceptProposedAction() if you use this function.

    \sa dropAction(), accept(), possibleActions()
*/
void QGraphicsSceneDragDropEvent::setDropAction(Qt::DropAction action)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->dropAction = action;
}

/*!
    This function returns the QGraphicsView that created the
    QGraphicsSceneDragDropEvent.
*/
QWidget *QGraphicsSceneDragDropEvent::source() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->source;
}

/*!
    \internal
    This function set the source widget, i.e., the widget that
    created the drop event, to \a source.
*/
void QGraphicsSceneDragDropEvent::setSource(QWidget *source)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->source = source;
}

/*!
    This function returns the MIME data of the event.
*/
const QMimeData *QGraphicsSceneDragDropEvent::mimeData() const
{
    Q_D(const QGraphicsSceneDragDropEvent);
    return d->mimeData;
}

/*!
    \internal
    This function sets the MIME data for the event.
*/
void QGraphicsSceneDragDropEvent::setMimeData(const QMimeData *data)
{
    Q_D(QGraphicsSceneDragDropEvent);
    d->mimeData = data;
}

class QGraphicsSceneResizeEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneResizeEvent)
public:
    inline QGraphicsSceneResizeEventPrivate()
    { }

    QSizeF oldSize;
    QSizeF newSize;
};

/*!
    Constructs a QGraphicsSceneResizeEvent.
*/
QGraphicsSceneResizeEvent::QGraphicsSceneResizeEvent()
    : QGraphicsSceneEvent(*new QGraphicsSceneResizeEventPrivate, QEvent::GraphicsSceneResize)
{
}

/*!
    Destroys the QGraphicsSceneResizeEvent.
*/
QGraphicsSceneResizeEvent::~QGraphicsSceneResizeEvent()
{
}

/*!
    Returns the old size (i.e., the size immediately before the widget was
    resized).

    \sa newSize(), QGraphicsWidget::resize()
*/
QSizeF QGraphicsSceneResizeEvent::oldSize() const
{
    Q_D(const QGraphicsSceneResizeEvent);
    return d->oldSize;
}

/*!
    \internal
*/
void QGraphicsSceneResizeEvent::setOldSize(const QSizeF &size)
{
    Q_D(QGraphicsSceneResizeEvent);
    d->oldSize = size;
}

/*!
    Returns the new size (i.e., the current size).

    \sa oldSize(), QGraphicsWidget::resize()
*/
QSizeF QGraphicsSceneResizeEvent::newSize() const
{
    Q_D(const QGraphicsSceneResizeEvent);
    return d->newSize;
}

/*!
    \internal
*/
void QGraphicsSceneResizeEvent::setNewSize(const QSizeF &size)
{
    Q_D(QGraphicsSceneResizeEvent);
    d->newSize = size;
}

class QGraphicsSceneMoveEventPrivate : public QGraphicsSceneEventPrivate
{
    Q_DECLARE_PUBLIC(QGraphicsSceneMoveEvent)
public:
    inline QGraphicsSceneMoveEventPrivate()
    { }

    QPointF oldPos;
    QPointF newPos;
};

/*!
    Constructs a QGraphicsSceneMoveEvent.
*/
QGraphicsSceneMoveEvent::QGraphicsSceneMoveEvent()
    : QGraphicsSceneEvent(*new QGraphicsSceneMoveEventPrivate, QEvent::GraphicsSceneMove)
{
}

/*!
    Destroys the QGraphicsSceneMoveEvent.
*/
QGraphicsSceneMoveEvent::~QGraphicsSceneMoveEvent()
{
}

/*!
    Returns the old position (i.e., the position immediately before the widget
    was moved).

    \sa newPos(), QGraphicsItem::setPos()
*/
QPointF QGraphicsSceneMoveEvent::oldPos() const
{
    Q_D(const QGraphicsSceneMoveEvent);
    return d->oldPos;
}

/*!
    \internal
*/
void QGraphicsSceneMoveEvent::setOldPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMoveEvent);
    d->oldPos = pos;
}

/*!
    Returns the new position (i.e., the current position).

    \sa oldPos(), QGraphicsItem::setPos()
*/
QPointF QGraphicsSceneMoveEvent::newPos() const
{
    Q_D(const QGraphicsSceneMoveEvent);
    return d->newPos;
}

/*!
    \internal
*/
void QGraphicsSceneMoveEvent::setNewPos(const QPointF &pos)
{
    Q_D(QGraphicsSceneMoveEvent);
    d->newPos = pos;
}

QT_END_NAMESPACE

#endif // QT_NO_GRAPHICSVIEW