How can i get quickview pointer from QWidget when use QWidget::createWindowContainer(quickview, this);

tony_yuan

class TestPage : public QWidget
{
    Q_OBJECT
public:
    explicit TestPage(QWidget *parent = nullptr);
    ~TestPage();
private:
    QStackedLayout *l;
    QQuickView *quickview;
};
TestPage::TestPage(QWidget *parent) : QWidget(parent)
{
    quickview = nullptr;
    quickview = new QQuickView();
    QWidget *container = QWidget::createWindowContainer(quickview, this);
    container->setMinimumSize(400, 400);
    container->setMaximumSize(400, 400);
    quickview->setSource(QUrl("qrc:/test.qml"));
    //embedded qquickview to qwidget
    l = new QStackedLayout(this);
    l->addWidget(container);
    this->setLayout(l);
}

For some reason ,I would like to get the quickview pointer (which emedded in QWidget with QWidget::createWindowContainer) from another thread. First i have got the TestPage pointer of my widget, then enumerate childdren of widget, i get the container pointer. But how can i get the pointer of quickview through container pointer.

QWidget::createWindowContainer return a QWidget pointer. QWidget have a function windowHandle. i tried container->windowHandle() ,but return nullptr.

eyllanesc

@tony_yuan Demo:

#include <QApplication>
#include <QGuiApplication>
#include <QQuickView>
#include <QVBoxLayout>
#include <QWidget>
#include <QWindow>

#include <QDebug>


int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
    QApplication app(argc, argv);

    QWidget widget;
    widget.resize(640, 480);
    QVBoxLayout *layout = new QVBoxLayout(&widget);

    QQuickView *view = new QQuickView;
    view->setObjectName("Fooview");
    view->setSource(QUrl("qrc:/main.qml"));

    QWidget *container = QWidget::createWindowContainer(view);
    layout->addWidget(container);

    // method 1
    for(QWindow *window : QGuiApplication::allWindows()){
        QQuickView *qview;
        if((qview = qobject_cast<QQuickView*>(window)) && (qview->objectName() == "Fooview")){
            qDebug() << "METHOD 1:" << qview;
        }
    }

    // method 2: show() must be called to create the QWindow
    widget.show();

    if(QWindow *window = container->window()->windowHandle()){
        QQuickView *view = window->findChild<QQuickView *>("Fooview");
        qDebug() << "METHOD 2:" << view;
    }

    return app.exec();
}

Output:

METHOD 1: QQuickView(0x557bc723ff10, visibility=QWindow::Hidden, flags=QFlags<Qt::WindowType>(Window), name="Fooview", parent=0x557bc7338440, geometry=0,0 640x480)
METHOD 2: QQuickView(0x557bc723ff10, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), name="Fooview", parent=0x557bc7423fb0, geometry=9,9 622x462)

tony_yuan

@eyllanesc Thanks for your reply, your solution works properly and is really userful for me.