- Qt 5.5
- Qt Widgets
- Diagram Scene Example
- diagramscene.h Example File
- Qt 5.5.1 Reference Documentation

# diagramscene.h Example File

graphicsview/diagramscene/diagramscene.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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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