6.5.3 clean

tests/manual/examples/widgets/mainwindows/mdi/CMakeLists.txt

@@ -0,0 +1,55 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(mdi LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/mdi")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(mdi
+    main.cpp
+    mainwindow.cpp mainwindow.h
+    mdichild.cpp mdichild.h
+)
+
+set_target_properties(mdi PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(mdi PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(mdi_resource_files
+    "images/copy.png"
+    "images/cut.png"
+    "images/new.png"
+    "images/open.png"
+    "images/paste.png"
+    "images/save.png"
+)
+
+qt_add_resources(mdi "mdi"
+    PREFIX
+        "/"
+    FILES
+        ${mdi_resource_files}
+)
+
+install(TARGETS mdi
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/widgets/mainwindows/mdi/main.cpp

@@ -0,0 +1,29 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QCommandLineParser>
+#include <QCommandLineOption>
+
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QCoreApplication::setApplicationName("MDI Example");
+    QCoreApplication::setOrganizationName("QtProject");
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCommandLineParser parser;
+    parser.setApplicationDescription("Qt MDI Example");
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument("file", "The file to open.");
+    parser.process(app);
+
+    MainWindow mainWin;
+    const QStringList posArgs = parser.positionalArguments();
+    for (const QString &fileName : posArgs)
+        mainWin.openFile(fileName);
+    mainWin.show();
+    return app.exec();
+}

tests/manual/examples/widgets/mainwindows/mdi/mainwindow.cpp

@@ -0,0 +1,463 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+#include "mdichild.h"
+
+MainWindow::MainWindow()
+    : mdiArea(new QMdiArea)
+{
+    mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    setCentralWidget(mdiArea);
+    connect(mdiArea, &QMdiArea::subWindowActivated,
+            this, &MainWindow::updateMenus);
+
+    createActions();
+    createStatusBar();
+    updateMenus();
+
+    readSettings();
+
+    setWindowTitle(tr("MDI"));
+    setUnifiedTitleAndToolBarOnMac(true);
+}
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    mdiArea->closeAllSubWindows();
+    if (mdiArea->currentSubWindow()) {
+        event->ignore();
+    } else {
+        writeSettings();
+        event->accept();
+    }
+}
+
+void MainWindow::newFile()
+{
+    MdiChild *child = createMdiChild();
+    child->newFile();
+    child->show();
+}
+
+void MainWindow::open()
+{
+    const QString fileName = QFileDialog::getOpenFileName(this);
+    if (!fileName.isEmpty())
+        openFile(fileName);
+}
+
+bool MainWindow::openFile(const QString &fileName)
+{
+    if (QMdiSubWindow *existing = findMdiChild(fileName)) {
+        mdiArea->setActiveSubWindow(existing);
+        return true;
+    }
+    const bool succeeded = loadFile(fileName);
+    if (succeeded)
+        statusBar()->showMessage(tr("File loaded"), 2000);
+    return succeeded;
+}
+
+bool MainWindow::loadFile(const QString &fileName)
+{
+    MdiChild *child = createMdiChild();
+    const bool succeeded = child->loadFile(fileName);
+    if (succeeded)
+        child->show();
+    else
+        child->close();
+    MainWindow::prependToRecentFiles(fileName);
+    return succeeded;
+}
+
+static inline QString recentFilesKey() { return QStringLiteral("recentFileList"); }
+static inline QString fileKey() { return QStringLiteral("file"); }
+
+static QStringList readRecentFiles(QSettings &settings)
+{
+    QStringList result;
+    const int count = settings.beginReadArray(recentFilesKey());
+    for (int i = 0; i < count; ++i) {
+        settings.setArrayIndex(i);
+        result.append(settings.value(fileKey()).toString());
+    }
+    settings.endArray();
+    return result;
+}
+
+static void writeRecentFiles(const QStringList &files, QSettings &settings)
+{
+    const int count = files.size();
+    settings.beginWriteArray(recentFilesKey());
+    for (int i = 0; i < count; ++i) {
+        settings.setArrayIndex(i);
+        settings.setValue(fileKey(), files.at(i));
+    }
+    settings.endArray();
+}
+
+bool MainWindow::hasRecentFiles()
+{
+    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
+    const int count = settings.beginReadArray(recentFilesKey());
+    settings.endArray();
+    return count > 0;
+}
+
+void MainWindow::prependToRecentFiles(const QString &fileName)
+{
+    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
+
+    const QStringList oldRecentFiles = readRecentFiles(settings);
+    QStringList recentFiles = oldRecentFiles;
+    recentFiles.removeAll(fileName);
+    recentFiles.prepend(fileName);
+    if (oldRecentFiles != recentFiles)
+        writeRecentFiles(recentFiles, settings);
+
+    setRecentFilesVisible(!recentFiles.isEmpty());
+}
+
+void MainWindow::setRecentFilesVisible(bool visible)
+{
+    recentFileSubMenuAct->setVisible(visible);
+    recentFileSeparator->setVisible(visible);
+}
+
+void MainWindow::updateRecentFileActions()
+{
+    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
+
+    const QStringList recentFiles = readRecentFiles(settings);
+    const int count = qMin(int(MaxRecentFiles), recentFiles.size());
+    int i = 0;
+    for ( ; i < count; ++i) {
+        const QString fileName = QFileInfo(recentFiles.at(i)).fileName();
+        recentFileActs[i]->setText(tr("&%1 %2").arg(i + 1).arg(fileName));
+        recentFileActs[i]->setData(recentFiles.at(i));
+        recentFileActs[i]->setVisible(true);
+    }
+    for ( ; i < MaxRecentFiles; ++i)
+        recentFileActs[i]->setVisible(false);
+}
+
+void MainWindow::openRecentFile()
+{
+    if (const QAction *action = qobject_cast<const QAction *>(sender()))
+        openFile(action->data().toString());
+}
+
+void MainWindow::save()
+{
+    if (activeMdiChild() && activeMdiChild()->save())
+        statusBar()->showMessage(tr("File saved"), 2000);
+}
+
+void MainWindow::saveAs()
+{
+    MdiChild *child = activeMdiChild();
+    if (child && child->saveAs()) {
+        statusBar()->showMessage(tr("File saved"), 2000);
+        MainWindow::prependToRecentFiles(child->currentFile());
+    }
+}
+
+#ifndef QT_NO_CLIPBOARD
+void MainWindow::cut()
+{
+    if (activeMdiChild())
+        activeMdiChild()->cut();
+}
+
+void MainWindow::copy()
+{
+    if (activeMdiChild())
+        activeMdiChild()->copy();
+}
+
+void MainWindow::paste()
+{
+    if (activeMdiChild())
+        activeMdiChild()->paste();
+}
+#endif
+
+void MainWindow::about()
+{
+   QMessageBox::about(this, tr("About MDI"),
+            tr("The <b>MDI</b> example demonstrates how to write multiple "
+               "document interface applications using Qt."));
+}
+
+void MainWindow::updateMenus()
+{
+    bool hasMdiChild = (activeMdiChild() != nullptr);
+    saveAct->setEnabled(hasMdiChild);
+    saveAsAct->setEnabled(hasMdiChild);
+#ifndef QT_NO_CLIPBOARD
+    pasteAct->setEnabled(hasMdiChild);
+#endif
+    closeAct->setEnabled(hasMdiChild);
+    closeAllAct->setEnabled(hasMdiChild);
+    tileAct->setEnabled(hasMdiChild);
+    cascadeAct->setEnabled(hasMdiChild);
+    nextAct->setEnabled(hasMdiChild);
+    previousAct->setEnabled(hasMdiChild);
+    windowMenuSeparatorAct->setVisible(hasMdiChild);
+
+#ifndef QT_NO_CLIPBOARD
+    bool hasSelection = (activeMdiChild() &&
+                         activeMdiChild()->textCursor().hasSelection());
+    cutAct->setEnabled(hasSelection);
+    copyAct->setEnabled(hasSelection);
+#endif
+}
+
+void MainWindow::updateWindowMenu()
+{
+    windowMenu->clear();
+    windowMenu->addAction(closeAct);
+    windowMenu->addAction(closeAllAct);
+    windowMenu->addSeparator();
+    windowMenu->addAction(tileAct);
+    windowMenu->addAction(cascadeAct);
+    windowMenu->addSeparator();
+    windowMenu->addAction(nextAct);
+    windowMenu->addAction(previousAct);
+    windowMenu->addAction(windowMenuSeparatorAct);
+
+    QList<QMdiSubWindow *> windows = mdiArea->subWindowList();
+    windowMenuSeparatorAct->setVisible(!windows.isEmpty());
+
+    for (int i = 0; i < windows.size(); ++i) {
+        QMdiSubWindow *mdiSubWindow = windows.at(i);
+        MdiChild *child = qobject_cast<MdiChild *>(mdiSubWindow->widget());
+
+        QString text;
+        if (i < 9) {
+            text = tr("&%1 %2").arg(i + 1)
+                               .arg(child->userFriendlyCurrentFile());
+        } else {
+            text = tr("%1 %2").arg(i + 1)
+                              .arg(child->userFriendlyCurrentFile());
+        }
+        QAction *action = windowMenu->addAction(text, mdiSubWindow, [this, mdiSubWindow]() {
+            mdiArea->setActiveSubWindow(mdiSubWindow);
+        });
+        action->setCheckable(true);
+        action ->setChecked(child == activeMdiChild());
+    }
+}
+
+MdiChild *MainWindow::createMdiChild()
+{
+    MdiChild *child = new MdiChild;
+    mdiArea->addSubWindow(child);
+
+#ifndef QT_NO_CLIPBOARD
+    connect(child, &QTextEdit::copyAvailable, cutAct, &QAction::setEnabled);
+    connect(child, &QTextEdit::copyAvailable, copyAct, &QAction::setEnabled);
+#endif
+
+    return child;
+}
+
+void MainWindow::createActions()
+{
+    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+    QToolBar *fileToolBar = addToolBar(tr("File"));
+
+    const QIcon newIcon = QIcon::fromTheme("document-new", QIcon(":/images/new.png"));
+    newAct = new QAction(newIcon, tr("&New"), this);
+    newAct->setShortcuts(QKeySequence::New);
+    newAct->setStatusTip(tr("Create a new file"));
+    connect(newAct, &QAction::triggered, this, &MainWindow::newFile);
+    fileMenu->addAction(newAct);
+    fileToolBar->addAction(newAct);
+
+//! [qaction setup]
+    const QIcon openIcon = QIcon::fromTheme("document-open", QIcon(":/images/open.png"));
+    QAction *openAct = new QAction(openIcon, tr("&Open..."), this);
+    openAct->setShortcuts(QKeySequence::Open);
+    openAct->setStatusTip(tr("Open an existing file"));
+    connect(openAct, &QAction::triggered, this, &MainWindow::open);
+    fileMenu->addAction(openAct);
+    fileToolBar->addAction(openAct);
+//! [qaction setup]
+
+    const QIcon saveIcon = QIcon::fromTheme("document-save", QIcon(":/images/save.png"));
+    saveAct = new QAction(saveIcon, tr("&Save"), this);
+    saveAct->setShortcuts(QKeySequence::Save);
+    saveAct->setStatusTip(tr("Save the document to disk"));
+    connect(saveAct, &QAction::triggered, this, &MainWindow::save);
+    fileToolBar->addAction(saveAct);
+
+    const QIcon saveAsIcon = QIcon::fromTheme("document-save-as");
+    saveAsAct = new QAction(saveAsIcon, tr("Save &As..."), this);
+    saveAsAct->setShortcuts(QKeySequence::SaveAs);
+    saveAsAct->setStatusTip(tr("Save the document under a new name"));
+    connect(saveAsAct, &QAction::triggered, this, &MainWindow::saveAs);
+    fileMenu->addAction(saveAsAct);
+
+    fileMenu->addSeparator();
+
+    QMenu *recentMenu = fileMenu->addMenu(tr("Recent..."));
+    connect(recentMenu, &QMenu::aboutToShow, this, &MainWindow::updateRecentFileActions);
+    recentFileSubMenuAct = recentMenu->menuAction();
+
+    for (int i = 0; i < MaxRecentFiles; ++i) {
+        recentFileActs[i] = recentMenu->addAction(QString(), this, &MainWindow::openRecentFile);
+        recentFileActs[i]->setVisible(false);
+    }
+
+    recentFileSeparator = fileMenu->addSeparator();
+
+    setRecentFilesVisible(MainWindow::hasRecentFiles());
+
+    fileMenu->addAction(tr("Switch layout direction"), this, &MainWindow::switchLayoutDirection);
+
+    fileMenu->addSeparator();
+
+//! [0]
+    const QIcon exitIcon = QIcon::fromTheme("application-exit");
+    QAction *exitAct = fileMenu->addAction(exitIcon, tr("E&xit"), qApp, &QApplication::quit);
+    exitAct->setShortcuts(QKeySequence::Quit);
+    exitAct->setStatusTip(tr("Exit the application"));
+    fileMenu->addAction(exitAct);
+//! [0]
+
+#ifndef QT_NO_CLIPBOARD
+    QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
+    QToolBar *editToolBar = addToolBar(tr("Edit"));
+
+    const QIcon cutIcon = QIcon::fromTheme("edit-cut", QIcon(":/images/cut.png"));
+    cutAct = new QAction(cutIcon, tr("Cu&t"), this);
+    cutAct->setShortcuts(QKeySequence::Cut);
+    cutAct->setStatusTip(tr("Cut the current selection's contents to the "
+                            "clipboard"));
+    connect(cutAct, &QAction::triggered, this, &MainWindow::cut);
+    editMenu->addAction(cutAct);
+    editToolBar->addAction(cutAct);
+
+    const QIcon copyIcon = QIcon::fromTheme("edit-copy", QIcon(":/images/copy.png"));
+    copyAct = new QAction(copyIcon, tr("&Copy"), this);
+    copyAct->setShortcuts(QKeySequence::Copy);
+    copyAct->setStatusTip(tr("Copy the current selection's contents to the "
+                             "clipboard"));
+    connect(copyAct, &QAction::triggered, this, &MainWindow::copy);
+    editMenu->addAction(copyAct);
+    editToolBar->addAction(copyAct);
+
+    const QIcon pasteIcon = QIcon::fromTheme("edit-paste", QIcon(":/images/paste.png"));
+    pasteAct = new QAction(pasteIcon, tr("&Paste"), this);
+    pasteAct->setShortcuts(QKeySequence::Paste);
+    pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
+                              "selection"));
+    connect(pasteAct, &QAction::triggered, this, &MainWindow::paste);
+    editMenu->addAction(pasteAct);
+    editToolBar->addAction(pasteAct);
+#endif
+
+    windowMenu = menuBar()->addMenu(tr("&Window"));
+    connect(windowMenu, &QMenu::aboutToShow, this, &MainWindow::updateWindowMenu);
+
+    closeAct = new QAction(tr("Cl&ose"), this);
+    closeAct->setStatusTip(tr("Close the active window"));
+    connect(closeAct, &QAction::triggered,
+            mdiArea, &QMdiArea::closeActiveSubWindow);
+
+    closeAllAct = new QAction(tr("Close &All"), this);
+    closeAllAct->setStatusTip(tr("Close all the windows"));
+    connect(closeAllAct, &QAction::triggered, mdiArea, &QMdiArea::closeAllSubWindows);
+
+    tileAct = new QAction(tr("&Tile"), this);
+    tileAct->setStatusTip(tr("Tile the windows"));
+    connect(tileAct, &QAction::triggered, mdiArea, &QMdiArea::tileSubWindows);
+
+    cascadeAct = new QAction(tr("&Cascade"), this);
+    cascadeAct->setStatusTip(tr("Cascade the windows"));
+    connect(cascadeAct, &QAction::triggered, mdiArea, &QMdiArea::cascadeSubWindows);
+
+    nextAct = new QAction(tr("Ne&xt"), this);
+    nextAct->setShortcuts(QKeySequence::NextChild);
+    nextAct->setStatusTip(tr("Move the focus to the next window"));
+    connect(nextAct, &QAction::triggered, mdiArea, &QMdiArea::activateNextSubWindow);
+
+    previousAct = new QAction(tr("Pre&vious"), this);
+    previousAct->setShortcuts(QKeySequence::PreviousChild);
+    previousAct->setStatusTip(tr("Move the focus to the previous "
+                                 "window"));
+    connect(previousAct, &QAction::triggered, mdiArea, &QMdiArea::activatePreviousSubWindow);
+
+    windowMenuSeparatorAct = new QAction(this);
+    windowMenuSeparatorAct->setSeparator(true);
+
+    updateWindowMenu();
+
+    menuBar()->addSeparator();
+
+    QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
+
+    QAction *aboutAct = helpMenu->addAction(tr("&About"), this, &MainWindow::about);
+    aboutAct->setStatusTip(tr("Show the application's About box"));
+
+    QAction *aboutQtAct = helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt);
+    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
+}
+
+void MainWindow::createStatusBar()
+{
+    statusBar()->showMessage(tr("Ready"));
+}
+
+void MainWindow::readSettings()
+{
+    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
+    const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
+    if (geometry.isEmpty()) {
+        const QRect availableGeometry = screen()->availableGeometry();
+        resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
+        move((availableGeometry.width() - width()) / 2,
+             (availableGeometry.height() - height()) / 2);
+    } else {
+        restoreGeometry(geometry);
+    }
+}
+
+void MainWindow::writeSettings()
+{
+    QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
+    settings.setValue("geometry", saveGeometry());
+}
+
+MdiChild *MainWindow::activeMdiChild() const
+{
+    if (QMdiSubWindow *activeSubWindow = mdiArea->activeSubWindow())
+        return qobject_cast<MdiChild *>(activeSubWindow->widget());
+    return nullptr;
+}
+
+QMdiSubWindow *MainWindow::findMdiChild(const QString &fileName) const
+{
+    QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();
+
+    const QList<QMdiSubWindow *> subWindows = mdiArea->subWindowList();
+    for (QMdiSubWindow *window : subWindows) {
+        MdiChild *mdiChild = qobject_cast<MdiChild *>(window->widget());
+        if (mdiChild->currentFile() == canonicalFilePath)
+            return window;
+    }
+    return nullptr;
+}
+
+void MainWindow::switchLayoutDirection()
+{
+    if (layoutDirection() == Qt::LeftToRight)
+        QGuiApplication::setLayoutDirection(Qt::RightToLeft);
+    else
+        QGuiApplication::setLayoutDirection(Qt::LeftToRight);
+}

tests/manual/examples/widgets/mainwindows/mdi/mainwindow.h

@@ -0,0 +1,84 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+class MdiChild;
+QT_BEGIN_NAMESPACE
+class QAction;
+class QMenu;
+class QMdiArea;
+class QMdiSubWindow;
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow();
+
+    bool openFile(const QString &fileName);
+
+protected:
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void newFile();
+    void open();
+    void save();
+    void saveAs();
+    void updateRecentFileActions();
+    void openRecentFile();
+#ifndef QT_NO_CLIPBOARD
+    void cut();
+    void copy();
+    void paste();
+#endif
+    void about();
+    void updateMenus();
+    void updateWindowMenu();
+    MdiChild *createMdiChild();
+    void switchLayoutDirection();
+
+private:
+    enum { MaxRecentFiles = 5 };
+
+    void createActions();
+    void createStatusBar();
+    void readSettings();
+    void writeSettings();
+    bool loadFile(const QString &fileName);
+    static bool hasRecentFiles();
+    void prependToRecentFiles(const QString &fileName);
+    void setRecentFilesVisible(bool visible);
+    MdiChild *activeMdiChild() const;
+    QMdiSubWindow *findMdiChild(const QString &fileName) const;
+
+    QMdiArea *mdiArea;
+
+    QMenu *windowMenu;
+    QAction *newAct;
+    QAction *saveAct;
+    QAction *saveAsAct;
+    QAction *recentFileActs[MaxRecentFiles];
+    QAction *recentFileSeparator;
+    QAction *recentFileSubMenuAct;
+#ifndef QT_NO_CLIPBOARD
+    QAction *cutAct;
+    QAction *copyAct;
+    QAction *pasteAct;
+#endif
+    QAction *closeAct;
+    QAction *closeAllAct;
+    QAction *tileAct;
+    QAction *cascadeAct;
+    QAction *nextAct;
+    QAction *previousAct;
+    QAction *windowMenuSeparatorAct;
+};
+
+#endif

tests/manual/examples/widgets/mainwindows/mdi/mdi.pro

@@ -0,0 +1,13 @@
+QT += widgets
+requires(qtConfig(filedialog))
+
+HEADERS       = mainwindow.h \
+                mdichild.h
+SOURCES       = main.cpp \
+                mainwindow.cpp \
+                mdichild.cpp
+RESOURCES     = mdi.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/mainwindows/mdi
+INSTALLS += target

tests/manual/examples/widgets/mainwindows/mdi/mdi.qrc

@@ -0,0 +1,10 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>images/copy.png</file>
+    <file>images/cut.png</file>
+    <file>images/new.png</file>
+    <file>images/open.png</file>
+    <file>images/paste.png</file>
+    <file>images/save.png</file>
+</qresource>
+</RCC>

tests/manual/examples/widgets/mainwindows/mdi/mdichild.cpp

@@ -0,0 +1,150 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#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(), &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();
+}

tests/manual/examples/widgets/mainwindows/mdi/mdichild.h

@@ -0,0 +1,39 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MDICHILD_H
+#define MDICHILD_H
+
+#include <QTextEdit>
+
+class MdiChild : public QTextEdit
+{
+    Q_OBJECT
+
+public:
+    MdiChild();
+
+    void newFile();
+    bool loadFile(const QString &fileName);
+    bool save();
+    bool saveAs();
+    bool saveFile(const QString &fileName);
+    QString userFriendlyCurrentFile();
+    QString currentFile() { return curFile; }
+
+protected:
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void documentWasModified();
+
+private:
+    bool maybeSave();
+    void setCurrentFile(const QString &fileName);
+    QString strippedName(const QString &fullFileName);
+
+    QString curFile;
+    bool isUntitled;
+};
+
+#endif