diff -r 000000000000 -r 1918ee327afb examples/tools/codecs/mainwindow.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/tools/codecs/mainwindow.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,203 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 | 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->setShortcuts(QKeySequence::Open);
+    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->setShortcuts(QKeySequence::Quit);
+    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);
+}