Want a toolbar status window for a modal application...

Posted on 2001-06-08
Last Modified: 2010-04-06
I need my application to have a "Machine status" tool window so the machine can be controlled using the tool window.

The problem is that this part of the application uses modal windows and I need the tool window to be accessable from any of the windows.

"TestForm" modal window
     \ test type 1 modal window
     \ test type 2 modal window

What I've found so far is that if I create the form and have it owned by TestForm, the "child" modal forms don't allow you to press buttons on the tool window.  What I did so far is that when I display a new "test type" form, I recreate the tool window and make it owned by the "test type".

I think I'm going about this the wrong way.  Here's what I've tried:

FormCreate:  Not really suitable for various reasons but if I use it anyhow, I can't access the window (it's as though it's owned by another form).

FormShow:  If it's put here, I get some pretty ugly flickering when the form loads.  LockWindowUpdate didn't help.

FormResize:  Definitely not a good idea to put it here; sometimes get access violations even though I'm always checking to ensure the form is there first.  Always setting to nil immediatly upon Free.

How can I share this window without recreating it all the time?  Hopefully someone has an idea which will fit my situation.

Question by:mikepj
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Expert Comment

ID: 6169386
Can't you try to do it the other way?
Let your "tool window" create the "machine window"?

Or don't make your tool window a modal window.

Author Comment

ID: 6169431
Thank you for your reply.

The tool window won't necessarily exist.

If I were to be able to change the order, I would think I would have the same problem because the tool window would instead own the modal test window.

I think I've solved the problem by:

1) using the FormResize event as a time to recreate the window
2) put up a semaphore so that it's impossible for any use of the window to be attempted between FREE and :=nil (there's nothing inbetween them but when I did that, it seems to work fine.)

Thanks again for your comments!  Just now I think I'll leave it alone--it works!
LVL 22

Accepted Solution

Mohammed Nasman earned 200 total points
ID: 6170406

  Try to do that in FormActivate event.
  could u send me a copy of ur program and what do u want to do at
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Expert Comment

ID: 6170889
So the answer is:

use the FormResize event as a time to recreate the window
and put up a semaphore so that it's impossible for any use of the window to be
attempted between FREE and :=nil (there's nothing inbetween them but when I did that,
it seems to work fine.

Author Comment

ID: 6171399
Hi Moorrees,

I guess you don't know how Experts Exchange works.  You've "recycled" my answer; if I were to accept the answer, two things happen:

- nobody will provide a better answer
- I give the points away rather than keeping the points when I had I had provided my own answer.


Author Comment

ID: 6171412
Thank you for your answer.  

I totally forgot about FormActivate.  It works great now--thanks!

I also did the following so frmToBeDestroyed would be made unavailable before destruction started.


I knew there must have been a better answer!


Author Comment

ID: 6181990
Found out some more through experience; I figured I'd relate my experiences in case anyone else finds them to be useful.

If form A is the parent of form B I will have problems if I don't destroy form B before closing form A.
I've changed it now so upon activate of form A, form B will be created.  Upon close of  form A, form B will be destroyed.

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