Path: utzoo!attcan!uunet!airgun!lampshir
From: lampshir@airgun.wg.waii.com (gregory b. lampshire)
Newsgroups: comp.windows.x
Subject: blocking and X
Keywords: blocking, X, Motif
Message-ID: <860@airgun.wg.waii.com>
Date: 10 Jul 90 19:12:37 GMT
Organization: Western Geophysical, Houston
Lines: 54



Greeting peoples....

I am hoping that all you Motif  experts out there can help me on a
small problem I am having.  What I wish to do is create an application
modal, blocking yes/no widget.  Let me explain.

I am writing a program that must ask alot of yes/no questions.  These
questions are critical and hence, the program cannot continue without
them.  What I would like to do is use the following code segment

Boolean answer;
...
answer = DoNotReturnWithoutAnswer("Do you want to continue?");
...

to return an answer.  However, in the event driven environment, even
with the widget's dialog type set to application modal, the func
'DoNotReturnWithoutAnswer' returns before the user can respond.  The
yes/no widget, however, is left displayed waiting for the user in an
event driven manner.

What I really need is to block until the user responds, could someone
give me some skeleton code to show me how to do this?  The sequence of
events should be thus....
  
1) call the yes/no func
2) popup a small window with the question string as the display string
3) create a yes and a no push button
4) block and grab the pointer (confined to the yes/no window box)
until the user responds
5) return either True or False

I have made some progress.  Using Intrinsics and the XtPopup() group
of funcs I can make the widget popup (without any fancy borders which
is what I wanted anyway) and display the two push buttons with label
string.  No problem.  I even grabbed the pointer.  However, the event
loop necessary for the blocking action is still alittle beyond me.
How about some help?

I know someone has already written something similar (I think
in the UK group) but did it do blocking.  I would appreciate
someone sending me the source if they have it.  Please do not
flame me if this issue has been brought up many times before,
I am a new reader of this newsgroup.



gregory lampshire     | Searching for a computer which can do it
western geophysical   | all......
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Gregory B. Lampshire     |    DOMAIN lampshir@airgun.wg.waii.com
Western Geophysical      |    UUNET  uunet!airgun!lampshir