Morning all,
I've written a small demo program to show the things that happen when an
application sub-window is hit in a PE program. The program has a window
containing a single application sub-window.
The hit routine does nothing more than this:
ahit0 movem.l d1/d3/d5-d7/a0/a4,-(a7) ; Save the workers
moveq #0,d1 ; D1.W = Application sub window number
moveq #0,d2 ; D2.W = Ink colour
; A4 already set to Working definition
jsr wm_swapp(a2) ; Set channel id (A0) to the subwindow
movem.l a1-a2,-(a7) ; A1 gets corrupted
lea hit,a1 ; Text string to print
move.w ut_mtext,a2 ; Print string vector
jsr (a2) ; Print the message
lea hitter,a1 ; Hit counter location
move.w (a1),d1 ; Hit counter value
addq.w #1,d1 ; Increment counter
move.w d1,(a1) ; Save counter
move.w ut_mint,a2 ; Print integer vector
jsr (a2) ; Print it
movem.l (a7)+,a1-a2 ; Restore
movem.l (a7)+,d1/d3/d5-d7/a0/a4 ; Restore the workers
moveq #0,d0 ; No errors
rts
; Strings and things go here
hitter dc.w 0 ; How many times have I been hit?
hit dc.w hit_e-hit-2 ; Hit message
dc.b 'HIT: '
hit_e equ *
Now, when run I notice the following "foibles":
1. The hit code is called when the pointer enters the sub-window, and
each time it moves within the sub-window.
2. Pressing the TAB key, which activates the sub-window, the counter
increases by TWO and not one.
3. Pressing the F1 key also increases the count by two.
4. Other keys, I have not tested everything, increment the counter by one.
There are no menus or anything in the sub-window, it is used simply as a
display area by the program, aub-window menus come in a later article!
Another question, I only have a single sub-window. If I comment out the
call to WM_SWAPP in the hit routine, I still see my output in the
sub-window, but it is not cleared before hand. (I can live with this)
but when I was writing PE stuff using SuperBasic and EasyPTR 3, I always
had to set the channel to the sub-window (or info window or whatever)
before I could write to it.
So, My further queries are:
1. Do I need to call WM_SWAPP if I only have one sub-window or can I
assume that the channel id always refers to the sub-window regardless
unless I explicitly set it to a loose item or whatever?
2. If I have two or more sub-windows, does the channel id, by default,
point at the first - I haven't tested this yet - If I don't call WM_SWAPP?
Thanks.
PS. The above has been noticed running on QPC under Wine on Linux. I'm
attempting to run it under Windows (in an emulator) to see what happens
there!
--
Norman Dunbar
Dunbar IT Consultants Ltd
Registered address:
Thorpe House
61 Richardshaw Lane
Pudsey
West Yorkshire
United Kingdom
LS28 7EL
Company Number: 05132767
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