set-scroll-page

Set the current page step size of a manual scrollbar. (This method has no effect on automatic scrollbars.)

See also init-manual-scrollbars.

• (send a-canvas set-scroll-page which value) -> void
      which : symbol in '(horizontal vertical)
      value : exact integer in [1, 10000]

  The which argument is either 'horizontal or 'vertical, indicating whether to set the page step size of the horizontal or vertical scrollbar, repsectively.