Qt 4.3: commands.cpp Example File (demos/undo/commands.cpp)

|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# commands.cpp Example File
demos/undo/commands.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 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://trolltech.com/products/qt/licenses/licensing/opensource/
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.0, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** In addition, as a special exception, Trolltech, as the sole copyright
     ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
     ** plug-in the right for the Qt/Eclipse Integration to link to
     ** functionality provided by Qt Designer and its related libraries.
     **
     ** Trolltech reserves all rights not expressly granted herein.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #include "commands.h"

     static const int setShapeRectCommandId = 1;
     static const int setShapeColorCommandId = 2;

     /******************************************************************************
     ** AddShapeCommand
     */

     AddShapeCommand::AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent)
         : QUndoCommand(parent)
     {
         m_doc = doc;
         m_shape = shape;
     }

     void AddShapeCommand::undo()
     {
         m_doc->deleteShape(m_shapeName);
     }

     void AddShapeCommand::redo()
     {
         // A shape only gets a name when it is inserted into a document
         m_shapeName = m_doc->addShape(m_shape);
         setText(QObject::tr("Add %1").arg(m_shapeName));
     }

     /******************************************************************************
     ** RemoveShapeCommand
     */

     RemoveShapeCommand::RemoveShapeCommand(Document *doc, const QString &shapeName,
                                             QUndoCommand *parent)
         : QUndoCommand(parent)
     {
         setText(QObject::tr("Remove %1").arg(shapeName));
         m_doc = doc;
         m_shape = doc->shape(shapeName);
         m_shapeName = shapeName;
     }

     void RemoveShapeCommand::undo()
     {
         m_shapeName = m_doc->addShape(m_shape);
     }

     void RemoveShapeCommand::redo()
     {
         m_doc->deleteShape(m_shapeName);
     }

     /******************************************************************************
     ** SetShapeColorCommand
     */

     SetShapeColorCommand::SetShapeColorCommand(Document *doc, const QString &shapeName,
                                                 const QColor &color, QUndoCommand *parent)
         : QUndoCommand(parent)
     {
         setText(QObject::tr("Set %1's color").arg(shapeName));

         m_doc = doc;
         m_shapeName = shapeName;
         m_oldColor = doc->shape(shapeName).color();
         m_newColor = color;
     }

     void SetShapeColorCommand::undo()
     {
         m_doc->setShapeColor(m_shapeName, m_oldColor);
     }

     void SetShapeColorCommand::redo()
     {
         m_doc->setShapeColor(m_shapeName, m_newColor);
     }

     bool SetShapeColorCommand::mergeWith(const QUndoCommand *command)
     {
         if (command->id() != setShapeColorCommandId)
             return false;

         const SetShapeColorCommand *other = static_cast<const SetShapeColorCommand*>(command);
         if (m_shapeName != other->m_shapeName)
             return false;

         m_newColor = other->m_newColor;
         return true;
     }

     int SetShapeColorCommand::id() const
     {
         return setShapeColorCommandId;
     }

     /******************************************************************************
     ** SetShapeRectCommand
     */

     SetShapeRectCommand::SetShapeRectCommand(Document *doc, const QString &shapeName,
                                                 const QRect &rect, QUndoCommand *parent)
         : QUndoCommand(parent)
     {
         setText(QObject::tr("Change %1's geometry").arg(shapeName));

         m_doc = doc;
         m_shapeName = shapeName;
         m_oldRect = doc->shape(shapeName).rect();
         m_newRect = rect;
     }

     void SetShapeRectCommand::undo()
     {
         m_doc->setShapeRect(m_shapeName, m_oldRect);
     }

     void SetShapeRectCommand::redo()
     {
         m_doc->setShapeRect(m_shapeName, m_newRect);
     }

     bool SetShapeRectCommand::mergeWith(const QUndoCommand *command)
     {
         if (command->id() != setShapeRectCommandId)
             return false;

         const SetShapeRectCommand *other = static_cast<const SetShapeRectCommand*>(command);
         if (m_shapeName != other->m_shapeName)
             return false;

         m_newRect = other->m_newRect;
         return true;
     }

     int SetShapeRectCommand::id() const
     {
         return setShapeRectCommandId;
     }