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# document.h Example File
demos/undo/document.h

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     ** included in the packaging of this file.  Alternatively you may (at
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     #ifndef DOCUMENT_H
     #define DOCUMENT_H

     #include <QWidget>

     class QUndoStack;
     class QTextStream;

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

         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);
         void mousePressEvent(QMouseEvent *event);
         void mouseReleaseEvent(QMouseEvent *event);
         void mouseMoveEvent(QMouseEvent *event);

     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