main.cpp Example File

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#include <QQuickWidget> #include <QQuickItem> #include <QQmlError> #include <QtWidgets> #include "fbitem.h" static bool optMultipleSample = false; static bool optCoreProfile = false; 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; }; MainWindow::MainWindow() : m_quickWidget(new QQuickWidget) { QSurfaceFormat format; if (optCoreProfile) { format.setVersion(4, 4); format.setProfile(QSurfaceFormat::CoreProfile); } 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")); fileMenu->addAction(tr("Grab framebuffer"), this, &MainWindow::grabFramebuffer); fileMenu->addAction(tr("Render to pixmap"), this, &MainWindow::renderToPixmap); 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); }); } void MainWindow::createQuickWidgetsInTabs(QMdiArea *mdiArea) { QTabWidget *tabWidget = new QTabWidget; const QSize size(400, 400); QQuickWidget *w = new QQuickWidget; w->resize(size); w->setResizeMode(QQuickWidget::SizeRootObjectToView); w->setSource(QUrl("qrc:quickwidget/rotatingsquaretab.qml")); tabWidget->addTab(w, tr("Plain Quick content")); w = new QQuickWidget; w->resize(size); w->setResizeMode(QQuickWidget::SizeRootObjectToView); w->setSource(QUrl("qrc:quickwidget/customgl.qml")); tabWidget->addTab(w, tr("Custom OpenGL drawing")); mdiArea->addSubWindow(tabWidget); tabWidget->show(); } void MainWindow::quickWidgetStatusChanged(QQuickWidget::Status status) { if (status == QQuickWidget::Error) { QStringList errors; 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() { QImage image = m_quickWidget->grabFramebuffer(); saveToFile(this, &image); } void MainWindow::renderToPixmap() { 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) { 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); QCommandLineOption coreProfileOption("coreprofile", "Use core profile"); parser.addOption(coreProfileOption); parser.process(app); optMultipleSample = parser.isSet(multipleSampleOption); optCoreProfile = parser.isSet(coreProfileOption); qmlRegisterType<FbItem>("QuickWidgetExample", 1, 0, "FbItem"); MainWindow mainWindow;; return app.exec(); } #include "main.moc"

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