gtk:widget-size-allocate (widget allocation)

widget -- a gtk:widget object
allocation -- a gdk:rectangle instance for the position and size to be allocated to the widget

This function is only used by gtk:container subclasses, to assign a size and position to their child widgets. In this function, the allocation may be adjusted. It will be forced to a 1 x 1 minimum size, and the adjust_size_allocation() virtual method on the child will be used to adjust the allocation. Standard adjustments include removing the margins of the widget, and applying the halign and valign properties of the widget.