Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# commands.h Example File

demos/undo/commands.h

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see http://www.qt.io/terms-conditions. For further
     ** information use the contact form at http://www.qt.io/contact-us.
     **
     ** 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 or version 3 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
     ** following information to ensure the GNU Lesser General Public License
     ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** As a special exception, The Qt Company gives you certain additional
     ** rights. These rights are described in The Qt Company 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 and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
     ** met: http://www.gnu.org/copyleft/gpl.html.
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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