AASKIP()

  Short:
  ------
  AASKIP() Use for skipblock for arrays in Tbrowse

  Returns:
  --------
  <nSkipcount> => number skipped, forward or backward

  Syntax:
  -------
  AASKIP(nSkip,@nElement,nMaxRows)

  Description:
  ------------
  Use this to create the SKIPBLOCK for a tbrowse that browses
  an array, as in :

    aTbrowseObject:SKIPBLOCK := {|n|aaskip(n,@nElement,len(aArray)}

  <nSkip>      is passed in by Tbrowse as a +- value, or
               as zero.

  <nElement>   is the current array element number.
               PASSED IN BY REFERENCE!

  <nMaxrows>   refers to the length of the array being
               browsed

  Examples:
  ---------
  // this example browses the fields in a database

   local nLastKey,  nElement    := 1
   local aArray := dbstruct()
   local oTb        := tBrowseNew(2,2,20,78)
   oTb:addcolumn(tbcolumnew("Name",{||aArray[nElement,1]}))
   oTb:addcolumn(tbcolumnew("Type", {||aArray[nElement,2]}))
   oTb:addcolumn(tbcolumnew("Len " , {||aArray[nElement,3]}))
   oTb:addcolumn(tbcolumnew("Deci",  {||aArray[nElement,4]}))
   oTb:Skipblock        := {|n|aaskip(n,@nElement,len(aArray)}
   oTb:goTopBlock       := {||nElement := 1}
   oTb:goBottomBlock    := {||nElement := len(aArray)}

   while .t.
     while !oTb:stabilize()
     end
     nLastKey := inkey(0)
     do case
        /// various actions.....
     endcase
   end

  Notes:
  -------
  Aaskip() is used by a lot of SuperLib functions, but
  is very useful by itself for creating array tbrowses.

  Source:
  -------
  S_AASKIP.PRG