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    41 

    42 #ifndef DIAGRAMSCENE_H

    43 #define DIAGRAMSCENE_H

    44 

    45 #include <QGraphicsScene>

    46 #include "diagramitem.h"

    47 #include "diagramtextitem.h"

    48 

    49 QT_BEGIN_NAMESPACE

    50 class QGraphicsSceneMouseEvent;

    51 class QMenu;

    52 class QPointF;

    53 class QGraphicsLineItem;

    54 class QFont;

    55 class QGraphicsTextItem;

    56 class QColor;

    57 QT_END_NAMESPACE

    58 

    59 //! [0]

    60 class DiagramScene : public QGraphicsScene

    61 {

    62     Q_OBJECT

    63 

    64 public:

    65     enum Mode { InsertItem, InsertLine, InsertText, MoveItem };

    66 

    67     DiagramScene(QMenu *itemMenu, QObject *parent = 0);

    68     QFont font() const

    69         { return myFont; }

    70     QColor textColor() const

    71         { return myTextColor; }

    72     QColor itemColor() const

    73         { return myItemColor; }

    74     QColor lineColor() const

    75         { return myLineColor; }

    76     void setLineColor(const QColor &color);

    77     void setTextColor(const QColor &color);

    78     void setItemColor(const QColor &color);

    79     void setFont(const QFont &font);

    80 

    81 public slots:

    82     void setMode(Mode mode);

    83     void setItemType(DiagramItem::DiagramType type);

    84     void editorLostFocus(DiagramTextItem *item);

    85 

    86 signals:

    87     void itemInserted(DiagramItem *item);

    88     void textInserted(QGraphicsTextItem *item);

    89     void itemSelected(QGraphicsItem *item);

    90 

    91 protected:

    92     void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);

    93     void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);

    94     void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);

    95 

    96 private:

    97     bool isItemChange(int type);

    98 

    99     DiagramItem::DiagramType myItemType;

   100     QMenu *myItemMenu;

   101     Mode myMode;

   102     bool leftButtonDown;

   103     QPointF startPoint;

   104     QGraphicsLineItem *line;

   105     QFont myFont;

   106     DiagramTextItem *textItem;

   107     QColor myTextColor;

   108     QColor myItemColor;

   109     QColor myLineColor;

   110 };

   111 //! [0]

   112 

   113 #endif