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diff --git a/examples/widgets/mainwindows/sdi/mainwindow.cpp b/examples/widgets/mainwindows/sdi/mainwindow.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+
+MainWindow::MainWindow()
+{
+    init();
+    setCurrentFile("");
+}
+
+MainWindow::MainWindow(const QString &fileName)
+{
+    init();
+    loadFile(fileName);
+}
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    if (maybeSave()) {
+        writeSettings();
+        event->accept();
+    } else {
+        event->ignore();
+    }
+}
+
+void MainWindow::newFile()
+{
+    MainWindow *other = new MainWindow;
+    other->move(x() + 40, y() + 40);
+    other->show();
+}
+
+void MainWindow::open()
+{
+    QString fileName = QFileDialog::getOpenFileName(this);
+    if (!fileName.isEmpty()) {
+        MainWindow *existing = findMainWindow(fileName);
+        if (existing) {
+            existing->show();
+            existing->raise();
+            existing->activateWindow();
+            return;
+        }
+
+        if (isUntitled && textEdit->document()->isEmpty()
+                && !isWindowModified()) {
+            loadFile(fileName);
+        } else {
+            MainWindow *other = new MainWindow(fileName);
+            if (other->isUntitled) {
+                delete other;
+                return;
+            }
+            other->move(x() + 40, y() + 40);
+            other->show();
+        }
+    }
+}
+
+bool MainWindow::save()
+{
+    if (isUntitled) {
+        return saveAs();
+    } else {
+        return saveFile(curFile);
+    }
+}
+
+bool MainWindow::saveAs()
+{
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
+                                                    curFile);
+    if (fileName.isEmpty())
+        return false;
+
+    return saveFile(fileName);
+}
+
+void MainWindow::about()
+{
+   QMessageBox::about(this, tr("About SDI"),
+            tr("The <b>SDI</b> example demonstrates how to write single "
+               "document interface applications using Qt."));
+}
+
+void MainWindow::documentWasModified()
+{
+    setWindowModified(true);
+}
+
+void MainWindow::init()
+{
+    setAttribute(Qt::WA_DeleteOnClose);
+
+    isUntitled = true;
+
+    textEdit = new QTextEdit;
+    setCentralWidget(textEdit);
+
+    createActions();
+    createMenus();
+    createToolBars();
+    createStatusBar();
+
+    readSettings();
+
+    connect(textEdit->document(), SIGNAL(contentsChanged()),
+            this, SLOT(documentWasModified()));
+
+    setUnifiedTitleAndToolBarOnMac(true);
+}
+
+void MainWindow::createActions()
+{
+    newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
+    newAct->setShortcuts(QKeySequence::New);
+    newAct->setStatusTip(tr("Create a new file"));
+    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
+
+    openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
+    openAct->setShortcuts(QKeySequence::Open);
+    openAct->setStatusTip(tr("Open an existing file"));
+    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
+
+    saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
+    saveAct->setShortcuts(QKeySequence::Save);
+    saveAct->setStatusTip(tr("Save the document to disk"));
+    connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
+
+    saveAsAct = new QAction(tr("Save &As..."), this);
+    saveAsAct->setShortcuts(QKeySequence::SaveAs);
+    saveAsAct->setStatusTip(tr("Save the document under a new name"));
+    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
+
+    closeAct = new QAction(tr("&Close"), this);
+    closeAct->setShortcut(tr("Ctrl+W"));
+    closeAct->setStatusTip(tr("Close this window"));
+    connect(closeAct, SIGNAL(triggered()), this, SLOT(close()));
+
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcuts(QKeySequence::Quit);
+    exitAct->setStatusTip(tr("Exit the application"));
+    connect(exitAct, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));
+
+    cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
+    cutAct->setShortcuts(QKeySequence::Cut);
+    cutAct->setStatusTip(tr("Cut the current selection's contents to the "
+                            "clipboard"));
+    connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));
+
+    copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
+    copyAct->setShortcuts(QKeySequence::Copy);
+    copyAct->setStatusTip(tr("Copy the current selection's contents to the "
+                             "clipboard"));
+    connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));
+
+    pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
+    pasteAct->setShortcuts(QKeySequence::Paste);
+    pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
+                              "selection"));
+    connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));
+
+    aboutAct = new QAction(tr("&About"), this);
+    aboutAct->setStatusTip(tr("Show the application's About box"));
+    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
+
+    aboutQtAct = new QAction(tr("About &Qt"), this);
+    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
+    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+
+
+    cutAct->setEnabled(false);
+    copyAct->setEnabled(false);
+    connect(textEdit, SIGNAL(copyAvailable(bool)),
+            cutAct, SLOT(setEnabled(bool)));
+    connect(textEdit, SIGNAL(copyAvailable(bool)),
+            copyAct, SLOT(setEnabled(bool)));
+}
+
+//! [implicit tr context]
+void MainWindow::createMenus()
+{
+    fileMenu = menuBar()->addMenu(tr("&File"));
+//! [implicit tr context]
+    fileMenu->addAction(newAct);
+    fileMenu->addAction(openAct);
+    fileMenu->addAction(saveAct);
+    fileMenu->addAction(saveAsAct);
+    fileMenu->addSeparator();
+    fileMenu->addAction(closeAct);
+    fileMenu->addAction(exitAct);
+
+    editMenu = menuBar()->addMenu(tr("&Edit"));
+    editMenu->addAction(cutAct);
+    editMenu->addAction(copyAct);
+    editMenu->addAction(pasteAct);
+
+    menuBar()->addSeparator();
+
+    helpMenu = menuBar()->addMenu(tr("&Help"));
+    helpMenu->addAction(aboutAct);
+    helpMenu->addAction(aboutQtAct);
+}
+
+void MainWindow::createToolBars()
+{
+//! [0]
+    fileToolBar = addToolBar(tr("File"));
+    fileToolBar->addAction(newAct);
+    fileToolBar->addAction(openAct);
+//! [0]
+    fileToolBar->addAction(saveAct);
+
+    editToolBar = addToolBar(tr("Edit"));
+    editToolBar->addAction(cutAct);
+    editToolBar->addAction(copyAct);
+    editToolBar->addAction(pasteAct);
+}
+
+void MainWindow::createStatusBar()
+{
+    statusBar()->showMessage(tr("Ready"));
+}
+
+void MainWindow::readSettings()
+{
+    QSettings settings;
+    QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
+    QSize size = settings.value("size", QSize(400, 400)).toSize();
+    move(pos);
+    resize(size);
+}
+
+void MainWindow::writeSettings()
+{
+    QSettings settings;
+    settings.setValue("pos", pos());
+    settings.setValue("size", size());
+}
+
+bool MainWindow::maybeSave()
+{
+    if (textEdit->document()->isModified()) {
+	QMessageBox::StandardButton ret;
+        ret = QMessageBox::warning(this, tr("SDI"),
+                     tr("The document has been modified.\n"
+                        "Do you want to save your changes?"),
+                     QMessageBox::Save | QMessageBox::Discard
+		     | QMessageBox::Cancel);
+        if (ret == QMessageBox::Save)
+            return save();
+        else if (ret == QMessageBox::Cancel)
+            return false;
+    }
+    return true;
+}
+
+void MainWindow::loadFile(const QString &fileName)
+{
+
+    QFile file(fileName);
+    if (!file.open(QFile::ReadOnly | QFile::Text)) {
+        QMessageBox::warning(this, tr("SDI"),
+                             tr("Cannot read file %1:\n%2.")
+                             .arg(fileName)
+                             .arg(file.errorString()));
+        return;
+    }
+
+    QTextStream in(&file);
+    QApplication::setOverrideCursor(Qt::WaitCursor);
+    textEdit->setPlainText(in.readAll());
+    QApplication::restoreOverrideCursor();
+
+    setCurrentFile(fileName);
+    statusBar()->showMessage(tr("File loaded"), 2000);
+}
+
+bool MainWindow::saveFile(const QString &fileName)
+{
+    QFile file(fileName);
+    if (!file.open(QFile::WriteOnly | QFile::Text)) {
+        QMessageBox::warning(this, tr("SDI"),
+                             tr("Cannot write file %1:\n%2.")
+                             .arg(fileName)
+                             .arg(file.errorString()));
+        return false;
+    }
+
+    QTextStream out(&file);
+    QApplication::setOverrideCursor(Qt::WaitCursor);
+    out << textEdit->toPlainText();
+    QApplication::restoreOverrideCursor();
+
+    setCurrentFile(fileName);
+    statusBar()->showMessage(tr("File saved"), 2000);
+    return true;
+}
+
+void MainWindow::setCurrentFile(const QString &fileName)
+{
+    static int sequenceNumber = 1;
+
+    isUntitled = fileName.isEmpty();
+    if (isUntitled) {
+        curFile = tr("document%1.txt").arg(sequenceNumber++);
+    } else {
+        curFile = QFileInfo(fileName).canonicalFilePath();
+    }
+
+    textEdit->document()->setModified(false);
+    setWindowModified(false);
+    setWindowFilePath(curFile);
+}
+
+QString MainWindow::strippedName(const QString &fullFileName)
+{
+    return QFileInfo(fullFileName).fileName();
+}
+
+MainWindow *MainWindow::findMainWindow(const QString &fileName)
+{
+    QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();
+
+    foreach (QWidget *widget, qApp->topLevelWidgets()) {
+        MainWindow *mainWin = qobject_cast<MainWindow *>(widget);
+        if (mainWin && mainWin->curFile == canonicalFilePath)
+            return mainWin;
+    }
+    return 0;
+}