'===========================================================================
' Subject: SCROLL BOX                        Date: 12-03-95 (17:46)       
' Author:  Kurt Kuzba                        Code: QB, QBasic, PDS        
' Origin:  mhscards@aol.com                Packet: MENU.ABC
'===========================================================================
   'Try this out. Once I overcame my reluctance to figure out the
'scrollbox dilemna, I was able to create this function. I made it a
'FUNCTION, as opposed to a SUB, because it is also useful for menus,
'and you can always just disregard the return value. And speaking of
'disregard, thank you, and many others, for not adding to the pointless
'puffery over who is wasting more bandwidth by pointing out who is
'wasting more bandwidth by pointing out who is wasting, etc., etc.,
'etc..
'_|_|_|   SCROLBOX.BAS
'_|_|_|   This program demonstrates the use of a configurable scroll
'_|_|_|   box with hi-lite marker and line number display.
'_|_|_|   It will read and display itself when it is run.
'_|_|_|   Released to the   PUBLIC DOMAIN   by Kurt Kuzba.
DECLARE FUNCTION ScrollBox% (lim%, high%, wide%, LIN%, COL%)
'$DYNAMIC$
TYPE textline
   l AS STRING * 80
END TYPE
DIM SHARED txt(800) AS textline
OPEN "scroll.bas" FOR INPUT AS #1
t% = 0
WHILE ((t% < 800) AND (NOT EOF(1)))
   LINE INPUT #1, txt(t%).l
   t% = t% + 1
WEND
CLOSE 1
selected% = ScrollBox%(t%, 22, 76, 1, 1)
COLOR 2, 0: CLS : PRINT "You hit ENTER on array item"; selected%
END
'_|_|_|   end   SCROLBOX.BAS

FUNCTION ScrollBox% (lim%, high%, wide%, LIN%, COL%)
   COLOR 7, 0: CLS : sel% = 0: top% = 0: ex% = lim%
   COLOR 9, 1: LOCATE 1, 1, 0: s$ = STRING$(wide%, " ")
   FOR t% = 0 TO high% + 1
      LOCATE LIN% + t%, COL%
      PRINT STRING$(wide% + 4, CHR$(177));
   NEXT
   LIN% = LIN% + 1: COL% = COL% + 2
   WHILE lim% = ex%
      COLOR 9, 1: LOCATE LIN% - 1, COL%
      PRINT MID$(STR$(sel% + 1), 2) + STRING$(3, CHR$(177))
      FOR t% = 0 TO (high% - 1)
         LOCATE LIN% + t%, COL%: COLOR 1, 3
         IF t% + top% = sel% THEN COLOR 0, 7
         PRINT LEFT$(txt(top% + t%).l + s$, wide%);
      NEXT: p% = 0: p$ = " HPIQGO" + CHR$(13)
      WHILE p% < 2: p% = INSTR(p$, RIGHT$(INKEY$, 1)): WEND
      SELECT CASE p%
         CASE IS = 2   'CURSOR UP
            IF sel% > 0 THEN sel% = sel% - 1
            IF sel% < top% THEN top% = sel%
         CASE IS = 3   'CURSOR DOWN
            IF sel% < (lim% - 1) THEN sel% = sel% + 1
            IF sel% > (top% + (high% - 2)) THEN top% = sel% - high% + 1
         CASE IS = 4   'PAGE UP
            top% = top% - high%: sel% = sel% - high%
            IF top% < 0 THEN top% = 0
            IF sel% < 0 THEN sel% = 0
         CASE IS = 5   'PAGE DOWN
            top% = top% + high%: sel% = sel% + high%
            IF top% >= lim% - high% THEN top% = lim% - high%
            IF top% < 0 THEN top% = 0
            IF sel% >= lim% THEN sel% = lim% - 1
         CASE IS = 6   'HOME
            top% = 0: sel% = 0
         CASE IS = 7   'END
            sel% = lim% - 1: top% = sel% - high% + 1
            IF top% < 0 THEN top% = 0
         CASE IS = 8   'ENTER
            lim% = sel%
      END SELECT
   WEND
   ScrollBox% = sel%
END FUNCTION