Revision control
++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QApplication>
++ #include <QCommandLineParser>
++ #include <QQuickWidget>
++ #include <QQuickItem>
++ #include <QQmlError>
++ #include <QMdiArea>
++ #include <QLCDNumber>
++ #include <QFileDialog>
++ #include <QStatusBar>
++ #include <QMainWindow>
++ #include <QMenuBar>
++ #include <QPushButton>
++
++ class MainWindow : public QMainWindow {
++ Q_OBJECT
++ public:
++ MainWindow();
++
++ private slots:
++ void quickWidgetStatusChanged(QQuickWidget::Status);
++ void sceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
++ void grabFramebuffer();
++ void renderToPixmap();
++ void grabToImage();
++ void createQuickWidgetsInTabs(QMdiArea *mdiArea);
++
++ private:
++ QQuickWidget *m_quickWidget;
++ };
++
++ static bool optMultipleSample = false;
++
++ MainWindow::MainWindow()
++ : m_quickWidget(new QQuickWidget)
++ {
++ QSurfaceFormat format;
++ if (optMultipleSample)
++ format.setSamples(4);
++ m_quickWidget->setFormat(format);
++
++ QMdiArea *centralWidget = new QMdiArea;
++
++ QLCDNumber *lcd = new QLCDNumber;
++ lcd->display(1337);
++ lcd->setMinimumSize(250,100);
++ centralWidget->addSubWindow(lcd);
++
++ QUrl source("qrc:quickwidget/rotatingsquare.qml");
++
++ connect(m_quickWidget, &QQuickWidget::statusChanged,
++ this, &MainWindow::quickWidgetStatusChanged);
++ connect(m_quickWidget, &QQuickWidget::sceneGraphError,
++ this, &MainWindow::sceneGraphError);
++ m_quickWidget->resize(300,300);
++ m_quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView );
++ m_quickWidget->setSource(source);
++
++ centralWidget->addSubWindow(m_quickWidget);
++
++ setCentralWidget(centralWidget);
++
++ QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
++ auto grabAction = fileMenu->addAction(tr("Grab framebuffer"), this, &MainWindow::grabFramebuffer);
++ auto renderAction = fileMenu->addAction(tr("Render to pixmap"), this, &MainWindow::renderToPixmap);
++ auto grabToImageAction = fileMenu->addAction(tr("Grab via grabToImage"), this, &MainWindow::grabToImage);
++ fileMenu->addAction(tr("Quit"), qApp, &QCoreApplication::quit);
++
++ QMenu *windowMenu = menuBar()->addMenu(tr("&Window"));
++ windowMenu->addAction(tr("Add tab widget"), this,
++ [this, centralWidget] { createQuickWidgetsInTabs(centralWidget); });
++
++ connect(m_quickWidget, &QObject::destroyed, this,
++ [this, grabAction, renderAction, grabToImageAction] {
++ m_quickWidget = nullptr;
++ grabAction->setEnabled(false);
++ renderAction->setEnabled(false);
++ grabToImageAction->setEnabled(false);
++ });
++ }
++
++ void MainWindow::createQuickWidgetsInTabs(QMdiArea *mdiArea)
++ {
++ // A QQuickWidget should work like any other widget when it comes to being
++ // in layouts, in tab widgets, MDI areas, etc. It can also be freely
++ // reparented and made top-level.
++
++ QTabWidget *tabWidget = new QTabWidget;
++ const QSize size(400, 400);
++ const QString msgToTopLevel = QLatin1String("Break out to top-level window");
++ const QString msgFromTopLevel = QLatin1String("Move back under tab widget");
++
++ static const int N = 4;
++ static const QColor colorTab[N] = { Qt::green, Qt::blue, Qt::yellow, Qt::magenta };
++ for (int i = 0; i < N; ++i) {
++ QQuickWidget *widget = new QQuickWidget;
++ widget->resize(size);
++ widget->setResizeMode(QQuickWidget::SizeRootObjectToView);
++ QObject::connect(widget, &QQuickWidget::statusChanged, widget, [widget, i] {
++ if (widget->status() == QQuickWidget::Ready) {
++ if (QQuickItem *rootItem = widget->rootObject()) {
++ rootItem->setProperty("rectColor", colorTab[i]);
++ }
++ }
++ });
++ widget->setSource(QUrl("qrc:quickwidget/rotatingsquare.qml"));
++ widget->setWindowTitle(QString::asprintf("Tab %d", i + 1));
++ QPushButton *btn = new QPushButton(msgToTopLevel, widget);
++ connect(btn, &QPushButton::clicked,
++ widget, [this, widget, btn, tabWidget, msgFromTopLevel, msgToTopLevel] {
++ if (widget->parent()) {
++ widget->setAttribute(Qt::WA_DeleteOnClose, true);
++ widget->setParent(nullptr);
++ connect(this, &QObject::destroyed, widget, &QWidget::close);
++ widget->show();
++ btn->setText(msgFromTopLevel);
++ } else {
++ widget->setAttribute(Qt::WA_DeleteOnClose, false);
++ disconnect(this, &QObject::destroyed, widget, &QWidget::close);
++ tabWidget->addTab(widget, widget->windowTitle());
++ btn->setText(msgToTopLevel);
++ }
++ });
++ tabWidget->addTab(widget, QString::asprintf("Tab %d", i + 1));
++ }
++
++ mdiArea->addSubWindow(tabWidget);
++ tabWidget->show();
++ }
++
++ void MainWindow::quickWidgetStatusChanged(QQuickWidget::Status status)
++ {
++ if (status == QQuickWidget::Error) {
++ QStringList errors;
++ Q_ASSERT(m_quickWidget);
++ const auto widgetErrors = m_quickWidget->errors();
++ for (const QQmlError &error : widgetErrors)
++ errors.append(error.toString());
++ statusBar()->showMessage(errors.join(QStringLiteral(", ")));
++ }
++ }
++
++ void MainWindow::sceneGraphError(QQuickWindow::SceneGraphError, const QString &message)
++ {
++ statusBar()->showMessage(message);
++ }
++
++ template<class T> void saveToFile(QWidget *parent, T *saveable)
++ {
++ QFileDialog fd(parent);
++ fd.setAcceptMode(QFileDialog::AcceptSave);
++ fd.setDefaultSuffix("png");
++ fd.selectFile("test.png");
++ if (fd.exec() == QDialog::Accepted)
++ saveable->save(fd.selectedFiles().first());
++ }
++
++ void MainWindow::grabFramebuffer()
++ {
++ Q_ASSERT(m_quickWidget);
++ QImage image = m_quickWidget->grabFramebuffer();
++ saveToFile(this, &image);
++ }
++
++ void MainWindow::renderToPixmap()
++ {
++ Q_ASSERT(m_quickWidget);
++ QPixmap pixmap(m_quickWidget->size());
++ m_quickWidget->render(&pixmap);
++ saveToFile(this, &pixmap);
++ }
++
++ void MainWindow::grabToImage()
++ {
++ QFileDialog fd(this);
++ fd.setAcceptMode(QFileDialog::AcceptSave);
++ fd.setDefaultSuffix("png");
++ fd.selectFile("test_grabToImage.png");
++ if (fd.exec() == QDialog::Accepted) {
++ Q_ASSERT(m_quickWidget);
++ QMetaObject::invokeMethod(m_quickWidget->rootObject(), "performLayerBasedGrab",
++ Q_ARG(QVariant, fd.selectedFiles().first()));
++ }
++ }
++
++ int main(int argc, char **argv)
++ {
++ QApplication app(argc, argv);
++
++ QCoreApplication::setApplicationName("Qt QQuickWidget Example");
++ QCoreApplication::setOrganizationName("QtProject");
++ QCoreApplication::setApplicationVersion(QT_VERSION_STR);
++
++ QCommandLineParser parser;
++ parser.setApplicationDescription(QCoreApplication::applicationName());
++ parser.addHelpOption();
++ parser.addVersionOption();
++ QCommandLineOption multipleSampleOption("multisample", "Multisampling");
++ parser.addOption(multipleSampleOption);
++
++ parser.process(app);
++
++ optMultipleSample = parser.isSet(multipleSampleOption);
++
++ MainWindow *mainWindow = new MainWindow;
++ mainWindow->setAttribute(Qt::WA_DeleteOnClose, true);
++ mainWindow->show();
++
++ return app.exec();
++ }
++
++ #include "main.moc"