Qt popup grabMouse for all children

I'm trying to create a popup menu like control that contains custom widgets. I need to capture the mouse, but I need to have the children in the widget still get their mouse messages. It appears the grabMouse sends events only to the widget that grabbed the mouse, not its children.

The popup is simply a series of buttons (using a QGridLayout). The control should work that the user presses the right-mouse button, t开发者_运维技巧he popup appears, they move to an item and release the mouse button. Optimally it would work exactly like a QMenu popup but with custom widgets and a custom layout.

How can I achieve this?

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It appears that simply specifying attribute Qt::Popup is enough to get the fundamental behaviour required.

Installing an event filter on all children is also necessary. All mouse events, enter/leave/hover events must be captured. QT has a defect with grabMouse so that won't work -- the filter must be used to get expected behaviour.