How to create Qt widgets inside existing native window?

[jiandingzhe]

I want to use Qt to develop audio plugins (VST2/VST3/AudioUnit) (actually I'm using JUCE). The plugins would have native window handles created by hosts, and how can I create QWidgets inside it?

I found there's QWindow::fromWinId that creates a QWindow wrapper, and QWidget::createWindowContainer that creates a QWidget. However it says createWindowContainer is used for embedding an alien native window inside Qt widget hierarchy, which is in reverse of what I want (embedding Qt widget hierarchy inside existing native window).

[JonB]

@jiandingzhe
I could be wrong(!), but I cannot imagine that can be done. The functions you mention allow Qt to take ownership of and show a native window. But (surely?) that window is then opaque to Qt, a native window cannot somehow have Qt widgets on it and I presume you cannot do such a thing.

[SGaist]

Hi,

If you need to provide a native handle to the core application, you should check QWidget::winId.
I think it should provide what you need. You would only need to call it on the widget that you need to pass to the application.

[jiandingzhe]

@SGaist Nope. The application pass a handle to me.

[jiandingzhe]

@JonB So it seems the only way is to firstly add the widget to desktop, then manage its native handle to be transient for the parent window from the host.

[seelenakimmma]

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