The page increment of the adjustment.
The page size of the adjustment.
Note that the page-size is irrelevant and should be set to zero
if the adjustment is used for a simple scalar value, e.g. in a
GtkSpinButton.
The step increment of the adjustment.
The maximum value of the adjustment.
Note that values will be restricted by upper - page-size if the page-size
property is nonzero.
The value of the adjustment.
The minimum value of the adjustment.