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

     /****************************************************************************
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     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the demonstration applications of the Qt Toolkit.
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     ** $QT_BEGIN_LICENSE:LGPL$
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     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
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     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
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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 };

         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