Value | Symbolic name | Description | 
|   0 | GTK_SPIN_STEP_FORWARD | 
   Spins forward by the value set in the underlying 
   step_increment.  This value can be overridden
   by setting the increment parameter to a value
   above 0.0.
   | 
|   1 | GTK_SPIN_STEP_BACKWARD | 
   Spins backward by the value set in the underlying 
   step_increment.  This value can be overridden
   by setting the increment parameter to a value
   above 0.0.
   | 
|   2 | GTK_SPIN_PAGE_FORWARD | 
   Spins forward by the value set as page_increment 
   in the underlying GtkAdjustment.  The value
   set in the increment parameter is ignored.
   | 
|   3 | GTK_SPIN_PAGE_BACKWARD | 
   Spins backward by the value set as page_increment 
   in the underlying GtkAdjustment.  The value
   set in the increment parameter is ignored.
   | 
|   4 | GTK_SPIN_HOME | 
   Spins to value set as lower bound.  The value
   set in the increment parameter is ignored.
   | 
|   5 | GTK_SPIN_END | 
   Spins to value set as upper bound.  The value
   set in the increment parameter is ignored.
   | 
|   6 | GTK_SPIN_USER_DEFINED | 
   Used where the amount of spin is not defined anywhere in the
   underlying GtkAdjustment.  Negative or
   positive values set in the increment parameter
   are used to indicate the direction of the spin.
   |