scroll-to

   

Called by the snip to request scrolling so that the given region is visible. The snip generally needs to be updated after a scroll, but the snip decides whether the update should occur immediately.

• (send a-wx:snip-admin scroll-to snip localx localy w h refresh? bias) -> boolean
      snip :  wx:snip% object
      localx : inexact real
      localy : inexact real
      w : inexact real
      h : inexact real
      refresh? : boolean
      bias = 0 : small integer

  The localx, localy, w, and h arguments specify a region of the snip to be made visible by the scroll (in snip coordinates).

  If refresh? is not #f, then the buffer is requesting to be updated immediately.

  The bias argument is one of:

  • -1 -- if the range doesn't fit in the visible area, show the top-left region
  • 0 -- no special scrolling instructions
  • 1 -- if the range doesn't fit in the visible area, show the bottom-right region