how I can grab the mouse move even when I don't press a mouse button?

Sachin Singh5y ago

Accepted answer

this is what the documentation says

mouseMoveEvent() is called whenever the mouse moves while a mouse button is held down. This can be useful during drag and drop operations.
If you call setMouseTracking (true), you get mouse move events even when no buttons are held down.

so you need to set setMouseTracking to true.

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Gopal5y ago

Thanks @Sachni

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Gopal5y ago

Yeah, found it later after understanding I used viewport()->setMouseTraking(bool) in another project and the fact that the viewport is a QWidget. Thank you anyway

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