Overlay.addOnGetChildPosition

The ::get-child-position signal is emitted to determine the position and size of any overlay child widgets. A handler for this signal should fill @allocation with the desired position and size for @widget, relative to the 'main' child of @overlay.

The default handler for this signal uses the @widget's halign and valign properties to determine the position and gives the widget its natural size (except that an alignment of %GTK_ALIGN_FILL will cause the overlay to be full-width/height). If the main child is a #GtkScrolledWindow, the overlays are placed relative to its contents.

class Overlay
void
addOnGetChildPosition

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