QWebEngineView as transparent overlay: Event Problem

JackD

Hi

I currently try to create an transparent window containing a QWebEngineView with a transparent background to generate a transparent overlay for another application. After some trial & error I got what I wanted and it looks the way a I intended (I'm an absolute beginner in C++ and Qt but have several years of Java experience).
The problem is now that the window does not behave like I expected. I can not click "through" the parts of the Window that are transparent. All events a caught by the 500x500px window. Is there a way to fix this? If I only create the window without the webengine it works.

Below is my very simple code:

#include <QtWidgets>
#include <QMainWindow>
#include <QApplication>
#include <qwebengineview.h>


int main(int argc, char *argv[])
{

    QApplication app(argc, argv);
    QMainWindow window;
    window.resize(500, 500);

    window.setWindowTitle("Transparency Test");
    //window.setAttribute(Qt::WA_NoSystemBackground, true);
    window.setAttribute(Qt::WA_TranslucentBackground, true);
    window.setWindowFlags(Qt::FramelessWindowHint);
    QWebEngineView* web = new QWebEngineView();
    web->page()->setBackgroundColor(Qt::transparent);
    web->setHtml("<html><head><style>"
                 "h1 {background-color: #00ff00;}</style></head>"
                 "<body style='background : rgba(0,0,0,0);' ><h1>This is heading 1</h1></body></html>",
                 QUrl("http://localhost"));
    window.setCentralWidget(web);

    window.show();
    return app.exec();
}

raven-worx

@JackD
i am not sure if it will work (probably not):

window.setAttribute( Qt::WA_TransparentForMouseEvents, true );
web.setAttribute( Qt::WA_TransparentForMouseEvents, false );

JackD

@raven-worx said:

window.setAttribute( Qt::WA_TransparentForMouseEvents, true );
web.setAttribute( Qt::WA_TransparentForMouseEvents, false );

Does unfortunately not work. As far as I understand the docs, WA_TransparentForMouseEvents should disable the handling of mouse events completely, but I need the mouse events on the parts of the web engine that are not transparent.

I made a poc with JavaFX webView and its working there, but JavaFX is using a very old webkit with a lot of features missing that I need.