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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
** This file is part of the QtGui module of the Qt Toolkit.
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE


#include <QtCore/qobject.h>
#include <QtCore/qpoint.h>
#include <QtCore/qrect.h>
#include <QtGui/qbrush.h>
#include <QtGui/qfont.h>
#include <QtGui/qmatrix.h>
#include <QtGui/qpen.h>




template<typename T> class QList;
class QFocusEvent;
class QKeyEvent;
class QGraphicsItem;
class QGraphicsItemGroup;
class QGraphicsEllipseItem;
class QGraphicsLineItem;
class QGraphicsPathItem;
class QGraphicsPixmapItem;
class QGraphicsPolygonItem;
class QGraphicsRectItem;
class QGraphicsSceneContextMenuEvent;
class QGraphicsSceneDragDropEvent;
class QGraphicsSceneEvent;
class QGraphicsSceneHelpEvent;
class QGraphicsSceneHoverEvent;
class QGraphicsSceneMouseEvent;
class QGraphicsSceneWheelEvent;
class QGraphicsTextItem;
class QHelpEvent;
class QLineF;
class QPainterPath;
class QPixmap;
class QPointF;
class QPolygonF;
class QRectF;
class QSizeF;
class QStyleOptionGraphicsItem;
class QInputMethodEvent;
class QGraphicsView;

class QGraphicsScenePrivate;
00073 class Q_GUI_EXPORT QGraphicsScene : public QObject
00076     Q_PROPERTY(QBrush backgroundBrush READ backgroundBrush WRITE setBackgroundBrush)
00077     Q_PROPERTY(QBrush foregroundBrush READ foregroundBrush WRITE setForegroundBrush)
00078     Q_PROPERTY(ItemIndexMethod itemIndexMethod READ itemIndexMethod WRITE setItemIndexMethod)
00079     Q_PROPERTY(QRectF sceneRect READ sceneRect WRITE setSceneRect)
00081     enum ItemIndexMethod {
        NoIndex = -1

    QGraphicsScene(QObject *parent = 0);
    QGraphicsScene(const QRectF &sceneRect, QObject *parent = 0);
    QGraphicsScene(qreal x, qreal y, qreal width, qreal height, QObject *parent = 0);
    virtual ~QGraphicsScene();

    QRectF sceneRect() const;
00092     inline qreal width() const { return sceneRect().width(); }
00093     inline qreal height() const { return sceneRect().height(); }
    void setSceneRect(const QRectF &rect);
    inline void setSceneRect(qreal x, qreal y, qreal w, qreal h)
    { setSceneRect(QRectF(x, y, w, h)); }

    void render(QPainter *painter,
                const QRectF &target = QRectF(), const QRectF &source = QRectF(),
                Qt::AspectRatioMode aspectRatioMode = Qt::KeepAspectRatio);

    ItemIndexMethod itemIndexMethod() const;
    void setItemIndexMethod(ItemIndexMethod method);

    QRectF itemsBoundingRect() const;

    QList<QGraphicsItem *> items() const;
    QList<QGraphicsItem *> items(const QPointF &pos) const;
    QList<QGraphicsItem *> items(const QRectF &rect, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
    QList<QGraphicsItem *> items(const QPolygonF &polygon, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
    QList<QGraphicsItem *> items(const QPainterPath &path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
    QList<QGraphicsItem *> collidingItems(const QGraphicsItem *item, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const;
    QGraphicsItem *itemAt(const QPointF &pos) const;
00114     inline QGraphicsItem *itemAt(qreal x, qreal y) const
    { return itemAt(QPointF(x, y)); }

    QList<QGraphicsItem *> selectedItems() const;
    void setSelectionArea(const QPainterPath &path);
    void clearSelection();

    QGraphicsItemGroup *createItemGroup(const QList<QGraphicsItem *> &items);
    void destroyItemGroup(QGraphicsItemGroup *group);

    void addItem(QGraphicsItem *item);
    QGraphicsEllipseItem *addEllipse(const QRectF &rect, const QPen &pen = QPen(), const QBrush &brush = QBrush());
    QGraphicsLineItem *addLine(const QLineF &line, const QPen &pen = QPen());
    QGraphicsPathItem *addPath(const QPainterPath &path, const QPen &pen = QPen(), const QBrush &brush = QBrush());
    QGraphicsPixmapItem *addPixmap(const QPixmap &pixmap);
    QGraphicsPolygonItem *addPolygon(const QPolygonF &polygon, const QPen &pen = QPen(), const QBrush &brush = QBrush());
    QGraphicsRectItem *addRect(const QRectF &rect, const QPen &pen = QPen(), const QBrush &brush = QBrush());
    QGraphicsTextItem *addText(const QString &text, const QFont &font = QFont());
    void removeItem(QGraphicsItem *item);

    QGraphicsItem *focusItem() const;
    void setFocusItem(QGraphicsItem *item, Qt::FocusReason focusReason = Qt::OtherFocusReason);
    bool hasFocus() const;
    void setFocus(Qt::FocusReason focusReason = Qt::OtherFocusReason);
    void clearFocus();

    QGraphicsItem *mouseGrabberItem() const;

    QBrush backgroundBrush() const;
    void setBackgroundBrush(const QBrush &brush);

    QBrush foregroundBrush() const;
    void setForegroundBrush(const QBrush &brush);

    virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const;

    QList <QGraphicsView *> views() const;

public Q_SLOTS:
    void update(const QRectF &rect = QRectF());
    void advance();

    bool event(QEvent *event);
    virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
    virtual void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
    virtual void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
    virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
    virtual void dropEvent(QGraphicsSceneDragDropEvent *event);
    virtual void focusInEvent(QFocusEvent *event);
    virtual void focusOutEvent(QFocusEvent *event);
    virtual void helpEvent(QGraphicsSceneHelpEvent *event);
    virtual void keyPressEvent(QKeyEvent *event);
    virtual void keyReleaseEvent(QKeyEvent *event);
    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
    virtual void wheelEvent(QGraphicsSceneWheelEvent *event);
    virtual void inputMethodEvent(QInputMethodEvent *event);

    virtual void drawBackground(QPainter *painter, const QRectF &rect);
    virtual void drawForeground(QPainter *painter, const QRectF &rect);
    virtual void drawItems(QPainter *painter, int numItems,
                           QGraphicsItem *items[],
                           const QStyleOptionGraphicsItem options[],
                           QWidget *widget = 0);

    void changed(const QList<QRectF> &region);
    void sceneRectChanged(const QRectF &rect);

    void itemUpdated(QGraphicsItem *item, const QRectF &rect);

    Q_PRIVATE_SLOT(d_func(), void _q_generateBspTree())
    Q_PRIVATE_SLOT(d_func(), void _q_emitUpdated())
    Q_PRIVATE_SLOT(d_func(), void _q_removeItemLater(QGraphicsItem *item))
    Q_PRIVATE_SLOT(d_func(), void _q_updateLater())
    friend class QGraphicsItem;
    friend class QGraphicsView;
    friend class QGraphicsViewPrivate;




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