the horizontal alignment of the child widget, from 0 (left) to 1 (right).

the vertical alignment of the child widget, from 0 (top) to 1 (bottom).

the amount that the child widget expands horizontally to fill up unused space, from 0 to 1. A value of 0 indicates that the child widget should never expand. A value of 1 indicates that the child widget will expand to fill all of the space allocated for the GtkAlignment.

the amount that the child widget expands vertically to fill up unused space, from 0 to 1. The values are similar to xscale.