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

     /****************************************************************************
     **
     ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** Commercial Usage
     ** 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
     ** a written agreement between you and Nokia.
     **
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License versions 2.0 or 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 ensure GNU General Public Licensing requirements will be met:
     ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
     ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
     ** exception, Nokia gives you certain additional rights. These rights
     ** are described in the Nokia Qt GPL Exception version 1.3, included in
     ** the file GPL_EXCEPTION.txt in this package.
     **
     ** Qt for Windows(R) Licensees
     ** As a special exception, Nokia, as the sole copyright holder for Qt
     ** Designer, grants users of the Qt/Eclipse Integration plug-in the
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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