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On 31/10/2007, at 6:53 AM, Chris Chambers wrote:
I've read the manual on this one and was hoping for some erudite
discussion
from people who have also had the similar problem or know for sure
that it
cannot be achieved.
I'm talking specifically about the positioning of the cursor when
the user
is paging thru the subfile and control has not been passed back to the
program. SFLRCDNBR is in the subfile control record and this is
only changed
when the user hands back control to the program by hitting enter.
Aaahh! Now I understand. You are complaining about the circumstance
where the subfile contains more than one page of data, the user moves
the cursor off the first displayed subfile record, then pages back or
forward to a page that already exists in the subfile, and then
discovers that the cursor remains where it was before the page
operation. You would like to see the cursor returned to the first
displayed subfile record (presuming there is an input-capable field
in that record). Yes?
How can we take advantage of the helpful features of the subfile
(scrolling
without troubling the program) and yet ensure that the subfile
itself can
always position the cursor at the 1st row on the screen (or can't
it ?)
As far as I know you can't accomplish this. The cursor position is
returned to the operating system as part of the page operation.
Because the subfile already contains records for the requested page
the OS does not return control to your program (you knew that) and
simply builds the data stream, including the previous cursor
position, and sends it to the display device.
There are three ways to solve the problem, all of which require extra
work on the part of the programmer:
1) Use SFLPAG=SFLSIZ processing and set the cursor position manually
2) Use a UIM list which automatically provides the cursor handling
you desire
3) Use the DSM APIs and handle all the screen processing yourself
Regards,
Simon Coulter.
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