Qt 4.8: commands.h Example File (demos/undo/commands.h)

Qt Reference Documentation

# commands.h Example File

demos/undo/commands.h

     /****************************************************************************
     **
     ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** GNU Lesser General Public License Usage
     ** 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 will be met:
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     ** rights. These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** 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
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     ** file. Please review the following information to ensure the GNU General
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     ** conditions contained in a signed written agreement between you and Nokia.
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     #ifndef COMMANDS_H
     #define COMMANDS_H

     #include <QUndoCommand>
     #include "document.h"

     class AddShapeCommand : public QUndoCommand
     {
     public:
         AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent = 0);
         void undo();
         void redo();

     private:
         Document *m_doc;
         Shape m_shape;
         QString m_shapeName;
     };

     class RemoveShapeCommand : public QUndoCommand
     {
     public:
         RemoveShapeCommand(Document *doc, const QString &shapeName, QUndoCommand *parent = 0);
         void undo();
         void redo();

     private:
         Document *m_doc;
         Shape m_shape;
         QString m_shapeName;
     };

     class SetShapeColorCommand : public QUndoCommand
     {
     public:
         SetShapeColorCommand(Document *doc, const QString &shapeName, const QColor &color,
                                 QUndoCommand *parent = 0);

         void undo();
         void redo();

         bool mergeWith(const QUndoCommand *command);
         int id() const;

     private:
         Document *m_doc;
         QString m_shapeName;
         QColor m_oldColor;
         QColor m_newColor;
     };

     class SetShapeRectCommand : public QUndoCommand
     {
     public:
         SetShapeRectCommand(Document *doc, const QString &shapeName, const QRect &rect,
                                 QUndoCommand *parent = 0);

         void undo();
         void redo();

         bool mergeWith(const QUndoCommand *command);
         int id() const;

     private:
         Document *m_doc;
         QString m_shapeName;
         QRect m_oldRect;
         QRect m_newRect;
     };

     #endif // COMMANDS_H