<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.3: commands.cpp Example File (demos/undo/commands.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">commands.cpp Example File<br /><sup><sup>demos/undo/commands.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2005-2008 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 versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.1, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** 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, 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. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. 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. ** ****************************************************************************/</span> #include "commands.h" static const int setShapeRectCommandId = 1; static const int setShapeColorCommandId = 2; <span class="comment"> /****************************************************************************** ** AddShapeCommand */</span> 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() { <span class="comment">//</span> 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)); } <span class="comment"> /****************************************************************************** ** RemoveShapeCommand */</span> 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); } <span class="comment"> /****************************************************************************** ** SetShapeColorCommand */</span> 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; } <span class="comment"> /****************************************************************************** ** SetShapeRectCommand */</span> 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; }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2008 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.3.4</div></td> </tr></table></div></address></body> </html>