public void set_focus_hadjustment (Adjustment adjustment)
Hooks up an adjustment to focus handling in a container, so when a child of the container is focused, the adjustment is scrolled to show that widget.
This function sets the horizontal alignment. See get_hadjustment for a typical way of obtaining the adjustment and set_focus_vadjustment for setting the vertical adjustment.
The adjustments have to be in pixel units and in the same coordinate system as the allocation for immediate children of the container.
an adjustment which should be adjusted when the focus is moved among the descendents of this