1 files changed, 158 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/mainwindows/mdi/mdichild.cpp b/tests/manual/examples/widgets/mainwindows/mdi/mdichild.cpp
new file mode 100644
index 0000000000..b922826ae3
--- /dev/null
+++ b/tests/manual/examples/widgets/mainwindows/mdi/mdichild.cpp
@@ -0,0 +1,158 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "mdichild.h"
+
+MdiChild::MdiChild(MdiChild *other)
+{
+    setAttribute(Qt::WA_DeleteOnClose);
+    if (other) {
+        auto *doc = other->document();
+        setDocument(doc);
+        setWindowModified(other->isWindowModified());
+        connect(doc, &QTextDocument::contentsChanged,
+                this, &MdiChild::documentWasModified);
+        curFile = other->curFile;
+        setWindowTitle(userFriendlyCurrentFile() + "[*]");
+    }
+}
+
+void MdiChild::newFile()
+{
+    static int sequenceNumber = 1;
+
+    isUntitled = true;
+    curFile = tr("document%1.txt").arg(sequenceNumber++);
+    setWindowTitle(curFile + "[*]");
+
+    connect(document(), &QTextDocument::contentsChanged,
+            this, &MdiChild::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);
+    QGuiApplication::setOverrideCursor(Qt::WaitCursor);
+    setPlainText(in.readAll());
+    QGuiApplication::restoreOverrideCursor();
+
+    setCurrentFile(fileName);
+
+    connect(document(), &QTextDocument::contentsChanged,
+            this, &MdiChild::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)
+{
+    QString errorMessage;
+
+    QGuiApplication::setOverrideCursor(Qt::WaitCursor);
+    QSaveFile file(fileName);
+    if (file.open(QFile::WriteOnly | QFile::Text)) {
+        QTextStream out(&file);
+        out << toPlainText();
+        if (!file.commit()) {
+            errorMessage = tr("Cannot write file %1:\n%2.")
+                           .arg(QDir::toNativeSeparators(fileName), file.errorString());
+        }
+    } else {
+        errorMessage = tr("Cannot open file %1 for writing:\n%2.")
+                       .arg(QDir::toNativeSeparators(fileName), file.errorString());
+    }
+    QGuiApplication::restoreOverrideCursor();
+
+    if (!errorMessage.isEmpty()) {
+        QMessageBox::warning(this, tr("MDI"), errorMessage);
+        return false;
+    }
+
+    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())
+        return true;
+    const QMessageBox::StandardButton 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);
+    switch (ret) {
+    case QMessageBox::Save:
+        return save();
+    case QMessageBox::Cancel:
+        return false;
+    default:
+        break;
+    }
+    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();
+}