Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!batcomputer!itsgw!brspyr1!tim
From: tim@brspyr1.BRS.Com (Tim Northrup)
Newsgroups: comp.windows.x
Subject: Re: probs with popup windows
Message-ID: <5834@brspyr1.BRS.Com>
Date: 5 May 89 18:25:52 GMT
References: <2461@lll-lcc.UUCP>
Organization: BRS Information Technologies, Latham NY
Lines: 46

From article <2461@lll-lcc.UUCP>, by chapman@lll-lcc.UUCP (Carol Chapman):
>
> program keeps running with garbage for the barcode.  When it finishes,
> *then* text appears in the popup window asking me for a barcode!  If I
> give it a barcode, it calls the check_barcode routine like I want
> it to, but when that finishes, it never returns to the point where
> XtPopup was originally called.  Isn't it supposed to return to that point?

This is where you went wrong (I recently hit the same problem).

XtPopup() returns after the popup window is established, not after you
return from any selection in the popup.  In the case you describe, after
calling XtPopup(), you should return;  All after-selection processing
gets done by the callback routines.

Using your example, this is a rough idea of what you want:

	void DoThatPopup () {
		XtPopup(popup_shell);	/* popup the dialog box */
					/* cannot process barcode yet!!! */
		return;			/* return to main loop */
		}

	void check_barcode () {

		<check validity of the barcode entered>

		if (<barcode is valid>) {
			XtPopdown(popup_shell);		/* all is well */
			<process valid barcode now>
			}
		return;			/* return with or without popup */
		}

	void cancel_action () {
		XtPopdown(popup_shell);		/* remove popup */
		return;				/* return to main loop */
		}

Hope this helps.
"It works for me." -- Hunter.
-- 
Tim Northrup      		  +------------------------------------------+
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