Re: The Diabolical Cursor Part II: This Time He's Mad

[Mike Madore <mmadore@xxxxxxxxxxxxxxxxxxx>]

Hi Brian,

Thanks for the code snippet.  I'll compare it to what we're doing.  I used
to be a real Delphi programmer years ago.  Turbo Pascal before that.

Mike

On Fri, 14 Apr 2000, Alex Brainman wrote:

> 
> ----- Original Message -----
> From: Mike Madore <mmadore@mail.turbolinux.com>
> To: <LINUX5250@midrange.com>
> Sent: Friday, April 14, 2000 2:05 AM
> Subject: Re: The Diabolical Cursor Part II: This Time He's Mad
> 
> >
> > The spec says that during the WRITE TO DISPLAY command the following logic
> > is used to determine cursor position:
> >
> > if (keyboard is locked) then
> >    Leave the cursor where it is
> > else
> >    1) Honer any insert cursor order
> >    2) Move to the first non-bypass field
> >    3) Move to position 0,0
> >
> 
> That is how I do it (no warranty implied), if it's any help...
> 
> You DON'T move cursor while processing command.
> You MUST do the processing on after WTD or Read,
> in fact, I DEFER ALL IC and MC until then, and the action
> DEPENDS on aCC = write control char 2:
> 
>   if ((aCC and $08) <> 0) and (State <> stateNormalUnlocked) then begin
>     KeyboardLocked := False;
>     AID.Reset;
>     if SystemIC.IsMC then begin
>       { MC order }
>       if SystemIC.Pending then
>         CurPos := SystemIC.Value;
>     end else begin
>       { IC order or nothing }
>       if (aCC and $40) = 0 then
>         MoveCursorHome;
>     end;
>   end;
> 
> where:
> 
> procedure TN5250Console.MoveCursorHome;
> begin
>   if SystemIC.Pending then
>     CurPos := SystemIC.HomePos
>   else begin
>     CurPos := 0;
>     Tab;
>   end;
> end;
> 
> I do SystemIC.Reset on
> 
> 1) Clear Unit
> 2) Clear Format Table
> 3) At the begining of Start Of Header
> 
> If you see, I use MoveCursorHome on Home key too
> (it took me a while to work that on out), whether it is
> right or not, but I haven't seen any problems yet.
> 
> Sorry, the code is Delphi, but, I assume, it's simple enough.
> 
> 
> Alex
> 
> 
> 
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