Qt 5.6 | Qt Widgets | Diagram Scene Example | diagramscene.h Example File

Qt 5.6.2 Reference Documentation

# diagramscene.h Example File

graphicsview/diagramscene/diagramscene.h

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      #ifndef DIAGRAMSCENE_H
      #define DIAGRAMSCENE_H

      #include "diagramitem.h"
      #include "diagramtextitem.h"

      #include <QGraphicsScene>

      class QGraphicsSceneMouseEvent;
      class QMenu;
      class QPointF;
      class QGraphicsLineItem;
      class QFont;
      class QGraphicsTextItem;
      class QColor;

      class DiagramScene : public QGraphicsScene
      {
          Q_OBJECT

      public:
          enum Mode { InsertItem, InsertLine, InsertText, MoveItem };

          explicit DiagramScene(QMenu *itemMenu, QObject *parent = 0);
          QFont font() const { return myFont; }
          QColor textColor() const { return myTextColor; }
          QColor itemColor() const { return myItemColor; }
          QColor lineColor() const { return myLineColor; }
          void setLineColor(const QColor &color);
          void setTextColor(const QColor &color);
          void setItemColor(const QColor &color);
          void setFont(const QFont &font);

      public slots:
          void setMode(Mode mode);
          void setItemType(DiagramItem::DiagramType type);
          void editorLostFocus(DiagramTextItem *item);

      signals:
          void itemInserted(DiagramItem *item);
          void textInserted(QGraphicsTextItem *item);
          void itemSelected(QGraphicsItem *item);

      protected:
          void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
          void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent) Q_DECL_OVERRIDE;
          void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent) Q_DECL_OVERRIDE;

      private:
          bool isItemChange(int type);

          DiagramItem::DiagramType myItemType;
          QMenu *myItemMenu;
          Mode myMode;
          bool leftButtonDown;
          QPointF startPoint;
          QGraphicsLineItem *line;
          QFont myFont;
          DiagramTextItem *textItem;
          QColor myTextColor;
          QColor myItemColor;
          QColor myLineColor;
      };

      #endif // DIAGRAMSCENE_H