QDialog with Qt::WindowModal on mac

divide

I need a blocking QDialog (the main app below should be inactive while it is shown) which is able to display sub-windows on top of it. I'm using this QDialog to display VST plugins, which are free to create multiple sub-windows if needed.

If I set it ApplicationModal, the QDialog is displayed fine, but any sub-windows is shown under the QDialog and therefore cannot be used.

ApplicationModal QDialog with no plugin shown

ApplicationModal QDialog with a plugin trying to show a sub-window (displayed behind the QDialog and inaccessible)

If I set it WindowModal, the sub-windows display and works as expected (on top of the QDialog), but the QDialog itself looks weird : it shares its title bar with the main application, and cannot be moved without moving the whole application.

WindowModal QDialog with no plugin shown; notice the title bar shared with the main application

WindowModal QDialog with a plugin showing a sub-window on top, as expected

So... I'm kinda stuck here. Is there a way to make a QDialog WindowModal while keeping its own title bar and freedom of movement over the main application, like the ApplicationModal dialog does ?

I'm using Qt 5.15 on macOS Catalina.

SGaist

Hi,

WindowModal and ApplicationModal are two different concepts. AFAIK, on macOS, the style for window modal dialog is to be shown as sheets like you see there.

divide

Ah, so it's by design and can't be tweaked.
In that case, do you know if I can show my dialog as non-modal (because it allows plugins to create sub-windows as expected) but somehow block the input events from my main window while this dialog is shown ? So it would act like a modal dialog, but I would handle the blocking/unblocking of the main window manually.