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I need to develop an application for Windows , Linux and Mac . To not have to write all the window cruft myself I chose to use Qt5 (over wxWidgets , because the latter ship no precompiled binaries). I have a GTK Widget (of Cef ) which I now need to embed, but sadly have no idea how.

There seems to have been QX11EmbedContainer in previous versions of Qt , but it is not present anymore and also I am not sure this works, when there is a switch to Weyland .

    QMainWindow* main_window = new QMainWindow;
    QX11EmbedContainer* container = new QX11EmbedContainer;
    main_window->setCentralWidget(container);
    //gtk code
    GtkWidget* window;
    GtkWidget* button;
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    button = gtk_button_new ();
    gtk_widget_show (button);
    gtk_container_add (GTK_CONTAINER (window), button);
    gtk_widget_show(window);
    XID id = GDK_WINDOW_XWINDOW (GTK_WIDGET(window)->window);
    container->embedClient(id);
you can use QX11EmbedContainer class on Qt4. 
                Usually it's better to explain a solution instead of just posting some rows of anonymous code. You can read How do I write a good answer, and also Explaining entirely code-based answers
– Anh Pham
                Nov 6, 2018 at 1:31
It's been 7 years, but I've dealt with this before. Here's what I found1:
I found a way to properly embed CEF inside a Qt window: embedding it inside an empty QWindow instead of a QWidget. There are some caveats, though:
To add the CEF window into a QWidget layout, you will need to use QWidget::createWindowContainer()
An empty QWindow doesn't render anything -- not even a background. So, you might need to use a QBackingStore to make it render something when CEF isn't embedded -- see the Raster Window example for some reference.
You might need to use the winId from before you add the QWindow into your widget's layout.
I highly recommend anyone still trying this to take a look at the entire thread1. QtWebkit is not longer an acceptable solution, while CEF centainly is.
        
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