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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">mainwindow.cpp Example File<br /><small><small>tools/codecs/mainwindow.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** 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 "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)) {

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)) {

QMessageBox::warning(this, tr("Codecs"),

tr("Cannot write file %1:\n%2")

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.arg(fileName)

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.arg(file.errorString()));

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return;

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}

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QAction *action = qobject_cast<QAction *>(sender());

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QByteArray codecName = action->data().toByteArray();

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QTextStream out(&file);

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out.setCodec(codecName);

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out << textEdit->toPlainText();

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}

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}

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void MainWindow::about()

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{

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QMessageBox::about(this, tr("About Codecs"),

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tr("The <b>Codecs</b> example demonstrates how to read and write "

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"files using various encodings."));

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}

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void MainWindow::aboutToShowSaveAsMenu()

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{

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QString currentText = textEdit->toPlainText();

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foreach (QAction *action, saveAsActs) {

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QByteArray codecName = action->data().toByteArray();

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QTextCodec *codec = QTextCodec::codecForName(codecName);

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action->setVisible(codec && codec->canEncode(currentText));

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}

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}

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void MainWindow::findCodecs()

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{

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QMap<QString, QTextCodec *> codecMap;

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QRegExp iso8859RegExp("ISO[- ]8859-([0-9]+).*");

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foreach (int mib, QTextCodec::availableMibs()) {

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QTextCodec *codec = QTextCodec::codecForMib(mib);

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QString sortKey = codec->name().toUpper();

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int rank;

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if (sortKey.startsWith("UTF-8")) {

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rank = 1;

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} else if (sortKey.startsWith("UTF-16")) {

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rank = 2;

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} else if (iso8859RegExp.exactMatch(sortKey)) {

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if (iso8859RegExp.cap(1).size() == 1)

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rank = 3;

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else

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rank = 4;

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} else {

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rank = 5;

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}

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sortKey.prepend(QChar('0' + rank));

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codecMap.insert(sortKey, codec);

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}

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codecs = codecMap.values();

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}

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void MainWindow::createActions()

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{

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openAct = new QAction(tr("&Open..."), this);

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openAct->setShortcut(tr("Ctrl+O"));

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connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

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foreach (QTextCodec *codec, codecs) {

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QString text = tr("%1...").arg(QString(codec->name()));

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QAction *action = new QAction(text, this);

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action->setData(codec->name());

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connect(action, SIGNAL(triggered()), this, SLOT(save()));

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saveAsActs.append(action);

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}

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exitAct = new QAction(tr("E&xit"), this);

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exitAct->setShortcut(tr("Ctrl+Q"));

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connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

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aboutAct = new QAction(tr("&About"), this);

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connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

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aboutQtAct = new QAction(tr("About &Qt"), this);

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connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

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}

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void MainWindow::createMenus()

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{

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saveAsMenu = new QMenu(tr("&Save As"), this);

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foreach (QAction *action, saveAsActs)

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saveAsMenu->addAction(action);

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connect(saveAsMenu, SIGNAL(aboutToShow()),

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this, SLOT(aboutToShowSaveAsMenu()));

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fileMenu = new QMenu(tr("&File"), this);

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fileMenu->addAction(openAct);

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fileMenu->addMenu(saveAsMenu);

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fileMenu->addSeparator();

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fileMenu->addAction(exitAct);

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helpMenu = new QMenu(tr("&Help"), this);

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helpMenu->addAction(aboutAct);

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helpMenu->addAction(aboutQtAct);

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menuBar()->addMenu(fileMenu);

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menuBar()->addSeparator();

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menuBar()->addMenu(helpMenu);

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}</pre>

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