<?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 (tools/undoframework/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>tools/undoframework/commands.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes 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 <QtGui> #include "commands.h" #include "diagramitem.h" MoveCommand::MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos, QUndoCommand *parent) : QUndoCommand(parent) { myDiagramItem = diagramItem; newPos = diagramItem->pos(); myOldPos = oldPos; } bool MoveCommand::mergeWith(const QUndoCommand *command) { const MoveCommand *moveCommand = static_cast<const MoveCommand *>(command); DiagramItem *item = moveCommand->myDiagramItem; if (myDiagramItem != item) return false; newPos = item->pos(); setText(QObject::tr("Move %1") .arg(createCommandString(myDiagramItem, newPos))); return true; } void MoveCommand::undo() { myDiagramItem->setPos(myOldPos); myDiagramItem->scene()->update(); setText(QObject::tr("Move %1") .arg(createCommandString(myDiagramItem, newPos))); } void MoveCommand::redo() { myDiagramItem->setPos(newPos); setText(QObject::tr("Move %1") .arg(createCommandString(myDiagramItem, newPos))); } DeleteCommand::DeleteCommand(QGraphicsScene *scene, QUndoCommand *parent) : QUndoCommand(parent) { myGraphicsScene = scene; QList<QGraphicsItem *> list = myGraphicsScene->selectedItems(); list.first()->setSelected(false); myDiagramItem = static_cast<DiagramItem *>(list.first()); setText(QObject::tr("Delete %1") .arg(createCommandString(myDiagramItem, myDiagramItem->pos()))); } void DeleteCommand::undo() { myGraphicsScene->addItem(myDiagramItem); myGraphicsScene->update(); } void DeleteCommand::redo() { myGraphicsScene->removeItem(myDiagramItem); } AddCommand::AddCommand(DiagramItem::DiagramType addType, QGraphicsScene *scene, QUndoCommand *parent) : QUndoCommand(parent) { static int itemCount = 0; myGraphicsScene = scene; myDiagramItem = new DiagramItem(addType); initialPosition = QPointF((itemCount * 15) % int(scene->width()), (itemCount * 15) % int(scene->height())); scene->update(); ++itemCount; setText(QObject::tr("Add %1") .arg(createCommandString(myDiagramItem, initialPosition))); } void AddCommand::undo() { myGraphicsScene->removeItem(myDiagramItem); myGraphicsScene->update(); } void AddCommand::redo() { myGraphicsScene->addItem(myDiagramItem); myDiagramItem->setPos(initialPosition); myGraphicsScene->clearSelection(); myGraphicsScene->update(); } QString createCommandString(DiagramItem *item, const QPointF &pos) { return QObject::tr("%1 at (%2, %3)") .arg(item->diagramType() == DiagramItem::Box ? "Box" : "Triangle") .arg(pos.x()).arg(pos.y()); }</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>