Qt 5.11 | Qt Widgets | Diagram Scene Example | diagramitem.h Example File

Qt 5.11.3 Reference Documentation

# diagramitem.h Example File

graphicsview/diagramscene/diagramitem.h

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      #ifndef DIAGRAMITEM_H
      #define DIAGRAMITEM_H

      #include <QGraphicsPixmapItem>
      #include <QList>

      class QPixmap;
      class QGraphicsItem;
      class QGraphicsScene;
      class QTextEdit;
      class QGraphicsSceneMouseEvent;
      class QMenu;
      class QGraphicsSceneContextMenuEvent;
      class QPainter;
      class QStyleOptionGraphicsItem;
      class QWidget;
      class QPolygonF;

      class Arrow;

      class DiagramItem : public QGraphicsPolygonItem
      {
      public:
          enum { Type = UserType + 15 };
          enum DiagramType { Step, Conditional, StartEnd, Io };

          DiagramItem(DiagramType diagramType, QMenu *contextMenu, QGraphicsItem *parent = 0);

          void removeArrow(Arrow *arrow);
          void removeArrows();
          DiagramType diagramType() const { return myDiagramType; }
          QPolygonF polygon() const { return myPolygon; }
          void addArrow(Arrow *arrow);
          QPixmap image() const;
          int type() const override { return Type;}

      protected:
          void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
          QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;

      private:
          DiagramType myDiagramType;
          QPolygonF myPolygon;
          QMenu *myContextMenu;
          QList<Arrow *> arrows;
      };

      #endif // DIAGRAMITEM_H