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** Copyright (C) 1992-2008 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 versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.1, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
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** or contact the sales department at sales@trolltech.com.
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
** 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/qtransform.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 QGraphicsSimpleTextItem;
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;
00095 class Q_GUI_EXPORT QGraphicsScene : public QObject
00098     Q_PROPERTY(QBrush backgroundBrush READ backgroundBrush WRITE setBackgroundBrush)
00099     Q_PROPERTY(QBrush foregroundBrush READ foregroundBrush WRITE setForegroundBrush)
00100     Q_PROPERTY(ItemIndexMethod itemIndexMethod READ itemIndexMethod WRITE setItemIndexMethod)
00101     Q_PROPERTY(QRectF sceneRect READ sceneRect WRITE setSceneRect)
00102     Q_PROPERTY(int bspTreeDepth READ bspTreeDepth WRITE setBspTreeDepth)
00104     enum ItemIndexMethod {
        NoIndex = -1

00109     enum SceneLayer {
        ItemLayer = 0x1,
        BackgroundLayer = 0x2,
        ForegroundLayer = 0x4,
        AllLayers = 0xffff
    Q_DECLARE_FLAGS(SceneLayers, SceneLayer)

    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;
00123     inline qreal width() const { return sceneRect().width(); }
00124     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);

    int bspTreeDepth() const;
    void setBspTreeDepth(int depth);

    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;

00149     inline QList<QGraphicsItem *> items(qreal x, qreal y, qreal w, qreal h, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const
    { return items(QRectF(x, y, w, h), mode); }
00151     inline QGraphicsItem *itemAt(qreal x, qreal y) const
    { return itemAt(QPointF(x, y)); }

    QList<QGraphicsItem *> selectedItems() const;
    QPainterPath selectionArea() const;
    void setSelectionArea(const QPainterPath &path);
    void setSelectionArea(const QPainterPath &path, Qt::ItemSelectionMode);
    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());
    QGraphicsSimpleTextItem *addSimpleText(const QString &text, const QFont &font = QFont());
00172     inline QGraphicsEllipseItem *addEllipse(qreal x, qreal y, qreal w, qreal h, const QPen &pen = QPen(), const QBrush &brush = QBrush())
    { return addEllipse(QRectF(x, y, w, h), pen, brush); }
00174     inline QGraphicsLineItem *addLine(qreal x1, qreal y1, qreal x2, qreal y2, const QPen &pen = QPen())
    { return addLine(QLineF(x1, y1, x2, y2), pen); }
00176     inline QGraphicsRectItem *addRect(qreal x, qreal y, qreal w, qreal h, const QPen &pen = QPen(), const QBrush &brush = QBrush())
    { return addRect(QRectF(x, y, w, h), pen, brush); }
    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;

00198     inline void update(qreal x, qreal y, qreal w, qreal h)
    { update(QRectF(x, y, w, h)); }
00200     inline void invalidate(qreal x, qreal y, qreal w, qreal h, SceneLayers layers = AllLayers)
    { invalidate(QRectF(x, y, w, h), layers); }

public Q_SLOTS:
    void update(const QRectF &rect = QRectF());
    void invalidate(const QRectF &rect = QRectF(), SceneLayers layers = AllLayers);
    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 selectionChanged();

    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 QGraphicsItemPrivate;
    friend class QGraphicsView;
    friend class QGraphicsViewPrivate;





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