Gtk.Widget.prototype.size_allocate

function size_allocate(allocation:Gtk.Allocation):void {
    // Gjs wrapper for gtk_widget_size_allocate()
}

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 1x1 minimum size, and the adjust_size_allocation virtual method on the child will be used to adjust the allocation. Standard adjustments include removing the widget's margins, and applying the widget's Gtk.halign and Gtk.valign properties.