The answer is, there are two ways.
1) code your long-running process as a function that performs one step per
call, and then returns. Recode your main event loop such that it returns
nillEvents when there are no events (i.e., pass a timeout value other than
forever in the GetNextEvent() call) and then call your work function every
time there is a nil event sent to your handler. This approach requires a lot
of statics and/or globals to maintain the current state of the work
function.
2) code your long-running process as is, but include a call to
GetNextEvent() with a timeout of 0 within the loop. If you get a non-nil
event that is a pendown, and the pendown is within the "Stop" button bounds,
then stop.
John Schettino
Palm OS Programming For Dummies: http://schettino.tripod.com
-----Original Message-----
From: Jason Simpkins [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 05, 2000 9:37 AM
To: Palm Developer Forum
Subject: Intercepting Form Buttons From within an EventHandler
Hello All,
I need to be able to break out of a loop that startes from within an
EventHandle function but have been unsuccessful in figureing this out. Here
is the pseudo code;
case MainFormButton : while( not end if database and NotRecord we seek){
getNextRecord(database);
if( Record is correct
one ){
EndRecordSearch
= True;
}
if
MainFormCancelSearchButtonPressed == True){
EndRecordSearch
= True;
UserCancel =
True;
}
} /* end while loop */
The crux here is how do you intercept an Event when you are already inside
of an Event Handler?
Thanks,
Jason
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