document.h Example File

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  #ifndef DOCUMENT_H
  #define DOCUMENT_H

  #include <QWidget>

  QT_FORWARD_DECLARE_CLASS(QUndoStack)
  QT_FORWARD_DECLARE_CLASS(QTextStream)

  class Shape
  {
  public:
      enum Type { Rectangle, Circle, Triangle };

      explicit Shape(Type type = Rectangle, const QColor &color = Qt::red, const QRect &rect = QRect());

      Type type() const;
      QString name() const;
      QRect rect() const;
      QRect resizeHandle() const;
      QColor color() const;

      static QString typeToString(Type type);
      static Type stringToType(const QString &s, bool *ok = 0);

      static const QSize minSize;

  private:
      Type m_type;
      QRect m_rect;
      QColor m_color;
      QString m_name;

      friend class Document;
  };

  class Document : public QWidget
  {
      Q_OBJECT

  public:
      Document(QWidget *parent = 0);

      QString addShape(const Shape &shape);
      void deleteShape(const QString &shapeName);
      Shape shape(const QString &shapeName) const;
      QString currentShapeName() const;

      void setShapeRect(const QString &shapeName, const QRect &rect);
      void setShapeColor(const QString &shapeName, const QColor &color);

      bool load(QTextStream &stream);
      void save(QTextStream &stream);

      QString fileName() const;
      void setFileName(const QString &fileName);

      QUndoStack *undoStack() const;

  signals:
      void currentShapeChanged(const QString &shapeName);

  protected:
      void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
      void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
      void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
      void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;

  private:
      void setCurrentShape(int index);
      int indexOf(const QString &shapeName) const;
      int indexAt(const QPoint &pos) const;
      QString uniqueName(const QString &name) const;

      QList<Shape> m_shapeList;
      int m_currentIndex;
      int m_mousePressIndex;
      QPoint m_mousePressOffset;
      bool m_resizeHandlePressed;
      QString m_fileName;

      QUndoStack *m_undoStack;
  };

  #endif // DOCUMENT_H