<?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 4.2: mdichild.cpp Example File (mainwindows/mdi/mdichild.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">mdichild.cpp Example File<br /><sup><sup>mainwindows/mdi/mdichild.cpp</sup></sup></h1> <pre> /**************************************************************************** ** ** Copyright (C) 2005-2006 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 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:<span class="comment">//www.trolltech.com/products/qt/opensource.html</span> ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http:<span class="comment">//www.trolltech.com/products/qt/licensing.html or contact the</span> ** sales department at sales@trolltech.com. ** ** 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 <QtGui> #include "mdichild.h" MdiChild::MdiChild() { setAttribute(Qt::WA_DeleteOnClose); isUntitled = true; } void MdiChild::newFile() { static int sequenceNumber = 1; isUntitled = true; curFile = tr("document%1.txt").arg(sequenceNumber++); setWindowTitle(curFile + "[*]"); connect(document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified())); } bool MdiChild::loadFile(const QString &fileName) { QFile file(fileName); if (!file.open(QFile::ReadOnly | QFile::Text)) { QMessageBox::warning(this, tr("MDI"), tr("Cannot read file %1:\n%2.") .arg(fileName) .arg(file.errorString())); return false; } QTextStream in(&file); QApplication::setOverrideCursor(Qt::WaitCursor); setPlainText(in.readAll()); QApplication::restoreOverrideCursor(); setCurrentFile(fileName); connect(document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified())); return true; } bool MdiChild::save() { if (isUntitled) { return saveAs(); } else { return saveFile(curFile); } } bool MdiChild::saveAs() { QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"), curFile); if (fileName.isEmpty()) return false; return saveFile(fileName); } bool MdiChild::saveFile(const QString &fileName) { QFile file(fileName); if (!file.open(QFile::WriteOnly | QFile::Text)) { QMessageBox::warning(this, tr("MDI"), tr("Cannot write file %1:\n%2.") .arg(fileName) .arg(file.errorString())); return false; } QTextStream out(&file); QApplication::setOverrideCursor(Qt::WaitCursor); out << toPlainText(); QApplication::restoreOverrideCursor(); setCurrentFile(fileName); return true; } QString MdiChild::userFriendlyCurrentFile() { return strippedName(curFile); } void MdiChild::closeEvent(QCloseEvent *event) { if (maybeSave()) { event->accept(); } else { event->ignore(); } } void MdiChild::documentWasModified() { setWindowModified(document()->isModified()); } bool MdiChild::maybeSave() { if (document()->isModified()) { QMessageBox::StandardButton ret; ret = QMessageBox::warning(this, tr("MDI"), tr("'%1' has been modified.\n" "Do you want to save your changes?") .arg(userFriendlyCurrentFile()), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel); if (ret == QMessageBox::Save) return save(); else if (ret == QMessageBox::Cancel) return false; } return true; } void MdiChild::setCurrentFile(const QString &fileName) { curFile = QFileInfo(fileName).canonicalFilePath(); isUntitled = false; document()->setModified(false); setWindowModified(false); setWindowTitle(userFriendlyCurrentFile() + "[*]"); } QString MdiChild::strippedName(const QString &fullFileName) { return QFileInfo(fullFileName).fileName(); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2006 <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 4.2.1</div></td> </tr></table></div></address></body> </html>