abap program for How to determine the number of available lines depending on the font size

Many ABAPERS have this problem, if a batch input has a table control, then the font size changes from machine to machine as
a result the no of entries keeps changing, So how to determine the number of available lines  depending on the font size.

I have a solution for this and it works fine.

Here is the code.

thanks
Poonam

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* data for controlling paging on screen 0102
DATA: W_MAXLINES(2) TYPE N,
W_NEXT_LINE(3) TYPE N,
W_PAGE(1), "y = page forward, n otherwise
W_SCRLEN(2) TYPE I,
W_SCRLINE(2) TYPE I.
DATA: BEGIN OF W_HDR.
INCLUDE STRUCTURE D020S.
DATA: END OF W_HDR.
DATA: BEGIN OF W_FLD OCCURS 100.
INCLUDE STRUCTURE D021S.
DATA: END OF W_FLD.
DATA: BEGIN OF W_LOG OCCURS 20.
INCLUDE STRUCTURE D022S.
DATA: END OF W_LOG.
DATA: BEGIN OF W_MC OCCURS 20.
INCLUDE STRUCTURE D023S.
DATA: END OF W_MC.
DATA: BEGIN OF W_DYNPRONAME,
PROGRAM(8) VALUE 'SAPMM60X',
DYNPRO(4) VALUE '0102',
END OF W_DYNPRONAME.

************************************************************************
FORM GET_MAX_LINES.
* set w_maxlines to the number of var-loop occurrences on the screen so
* that we know when to page forward on screen 0102
* also initialise w_next_line to zero for GET_NEXT_LINE
* this subroutine caters for all cases - including screens without loops
CLEAR: W_MAXLINES,
W_NEXT_LINE.
IMPORT DYNPRO W_HDR
W_FLD
W_LOG
W_MC
ID W_DYNPRONAME.
LOOP AT W_FLD WHERE LTYP EQ 'L'.
MOVE W_FLD-LINE TO W_SCRLINE. "first var-loop line
MOVE W_FLD-LBLK TO W_SCRLEN. "depth of loop block
EXIT.
ENDLOOP.
IF SY-SUBRC EQ 0
AND W_SCRLEN NE 0.
* sy-srows = total no of lines on screen
* w_scrline = actual first line of loop so that
* w_scrline - 1 = number of heading lines (before loop)
* 4 = no of lines at top of screen - command line, pushbuttons, 2 ulines
* 3 = no of lines after loop - uline & Page count
* w_scrlen = no of lines in loop block
* w_maxlines = sy-srows - ( wscrline - 1 ) - 4 - 3
* and then 1 less but not sure why!
W_MAXLINES = SY-SROWS - W_SCRLINE - 1 - 4 - 3.
W_MAXLINES = W_MAXLINES - 1.
W_MAXLINES = W_MAXLINES DIV W_SCRLEN.
ELSE.
MOVE 99 TO W_MAXLINES. "this required if no screen loop
ENDIF.
ENDFORM.


************************************************************************
FORM GET_NEXT_LINE.
* set w_page if page forward is required
W_NEXT_LINE = W_NEXT_LINE + 1.
IF W_NEXT_LINE GT W_MAXLINES.
W_NEXT_LINE = 1.
W_PAGE = 'Y'.
ELSE.
W_PAGE = 'N'.
ENDIF.
ENDFORM.
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