Adds widget to overlay.
The widget will be stacked on top of the main widget added with Container.add.
The position at which widget is placed is determined from its halign and valign properties.
a gtk.Widget to be added to the container
3.2
Adds widget to overlay.
The widget will be stacked on top of the main widget added with Container.add.
The position at which widget is placed is determined from its halign and valign properties.