<?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: mainwindow.cpp Example File (tools/codecs/mainwindow.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">mainwindow.cpp Example File<br /><sup><sup>tools/codecs/mainwindow.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2004-2008 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 "mainwindow.h" #include "previewform.h" MainWindow::MainWindow() { textEdit = new QTextEdit; textEdit->setLineWrapMode(QTextEdit::NoWrap); setCentralWidget(textEdit); findCodecs(); previewForm = new PreviewForm(this); previewForm->setCodecList(codecs); createActions(); createMenus(); setWindowTitle(tr("Codecs")); resize(500, 400); } void MainWindow::open() { QString fileName = QFileDialog::getOpenFileName(this); if (!fileName.isEmpty()) { QFile file(fileName); if (!file.open(QFile::ReadOnly | QFile::Text)) { QMessageBox::warning(this, tr("Codecs"), tr("Cannot read file %1:\n%2") .arg(fileName) .arg(file.errorString())); return; } QByteArray data = file.readAll(); previewForm->setEncodedData(data); if (previewForm->exec()) textEdit->setPlainText(previewForm->decodedString()); } } void MainWindow::save() { QString fileName = QFileDialog::getSaveFileName(this); if (!fileName.isEmpty()) { QFile file(fileName); if (!file.open(QFile::WriteOnly | QFile::Text)) { QMessageBox::warning(this, tr("Codecs"), tr("Cannot write file %1:\n%2") .arg(fileName) .arg(file.errorString())); return; } QAction *action = qobject_cast<QAction *>(sender()); QByteArray codecName = action->data().toByteArray(); QTextStream out(&file); out.setCodec(codecName); out << textEdit->toPlainText(); } } void MainWindow::about() { QMessageBox::about(this, tr("About Codecs"), tr("The <b>Codecs</b> example demonstrates how to read and write " "files using various encodings.")); } void MainWindow::aboutToShowSaveAsMenu() { QString currentText = textEdit->toPlainText(); foreach (QAction *action, saveAsActs) { QByteArray codecName = action->data().toByteArray(); QTextCodec *codec = QTextCodec::codecForName(codecName); action->setVisible(codec && codec->canEncode(currentText)); } } void MainWindow::findCodecs() { QMap<QString, QTextCodec *> codecMap; QRegExp iso8859RegExp("ISO[- ]8859-([0-9]+).*"); foreach (int mib, QTextCodec::availableMibs()) { QTextCodec *codec = QTextCodec::codecForMib(mib); QString sortKey = codec->name().toUpper(); int rank; if (sortKey.startsWith("UTF-8")) { rank = 1; } else if (sortKey.startsWith("UTF-16")) { rank = 2; } else if (iso8859RegExp.exactMatch(sortKey)) { if (iso8859RegExp.cap(1).size() == 1) rank = 3; else rank = 4; } else { rank = 5; } sortKey.prepend(QChar('0' + rank)); codecMap.insert(sortKey, codec); } codecs = codecMap.values(); } void MainWindow::createActions() { openAct = new QAction(tr("&Open..."), this); openAct->setShortcut(tr("Ctrl+O")); connect(openAct, SIGNAL(triggered()), this, SLOT(open())); foreach (QTextCodec *codec, codecs) { QString text = tr("%1...").arg(QString(codec->name())); QAction *action = new QAction(text, this); action->setData(codec->name()); connect(action, SIGNAL(triggered()), this, SLOT(save())); saveAsActs.append(action); } exitAct = new QAction(tr("E&xit"), this); exitAct->setShortcut(tr("Ctrl+Q")); connect(exitAct, SIGNAL(triggered()), this, SLOT(close())); aboutAct = new QAction(tr("&About"), this); connect(aboutAct, SIGNAL(triggered()), this, SLOT(about())); aboutQtAct = new QAction(tr("About &Qt"), this); connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt())); } void MainWindow::createMenus() { saveAsMenu = new QMenu(tr("&Save As"), this); foreach (QAction *action, saveAsActs) saveAsMenu->addAction(action); connect(saveAsMenu, SIGNAL(aboutToShow()), this, SLOT(aboutToShowSaveAsMenu())); fileMenu = new QMenu(tr("&File"), this); fileMenu->addAction(openAct); fileMenu->addMenu(saveAsMenu); fileMenu->addSeparator(); fileMenu->addAction(exitAct); helpMenu = new QMenu(tr("&Help"), this); helpMenu->addAction(aboutAct); helpMenu->addAction(aboutQtAct); menuBar()->addMenu(fileMenu); menuBar()->addSeparator(); menuBar()->addMenu(helpMenu); }</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>