1 files changed, 175 insertions, 0 deletions
diff --git a/examples/widgets/mainwindows/mdi/mdichild.cpp b/examples/widgets/mainwindows/mdi/mdichild.cpp
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index 0000000000..2279fe7044
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+++ b/examples/widgets/mainwindows/mdi/mdichild.cpp
@@ -0,0 +1,175 @@
+/****************************************************************************
+**
+** 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 "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();
+}