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From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga
Subject: Re: Gadget ID codes?
Message-ID: <31230@sun.uucp>
Date: Mon, 19-Oct-87 13:37:26 EDT
Article-I.D.: sun.31230
Posted: Mon Oct 19 13:37:26 1987
Date-Received: Tue, 20-Oct-87 20:46:57 EDT
References: <IVS3u9y00WAENjc04b@andrew.cmu.edu>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 57

In article <IVS3u9y00WAENjc04b@andrew.cmu.edu> (Michael Portuesi) writes:
>I want to present a requester in the current window with a string
>gadget for user input and two boolean gadgets for "OK" and "Cancel."
>If the user selects "Cancel", obviously I don't want to do anything.
>What is the correct way to determine what gadget the user activated
>to end the requester?  I set the GadgetID field of each of my gadget
>definitions to a unique value.  I throw the requester up on the
>screen, wait for an IDCMP message, extract the code from the message
>structure, then reply to it.  My assumption is that the message code
>would contain the ID of the selected gadget that caused the requester
>to end, although the Intuition manual doesn't really tell you what it
>should contain.  Is my assumption correct?

Yes, it is correct. When you put up a requester, assuming it does not
have the NOISY flag set, then all of the IDCMP events you will receive
come from that requester. If you have gadgets in the requester your 
loop looks something like :
(Note, this is from memory so some structure fields may be wrong)

done = FALSE;
do {
	Wait(mywindow->UserPort->mpSigBit);
	im = (struct IntuiMessage *)GetMsg(mywindow->UserPort);
	if (im == NULL) continue;
	class = im->Class;
	address = im->Iadress;
	x = im->MouseX;
	y = im->MouseY;
	ReplyMsg(im);
	switch (classe) {
		case GADGETUP :
		case GADGETDOWN :
			g = (struct Gadget *)address;
			done = ((g->GadgetFlags & ENDGADGET) != 0);
			id = g->GadgetID;
			switch (id) {
				case CANCELID : /* cancel here */;
				case OKID : /* process data here */;
				etc;
			}
			break; 
		default : break;
	}
} while (! done);

Which will loop around until a gadget with the ENDGADGET flag is clicked
upon. In the meantime clicking on other gadgets will be processed by this
loop. Note that if you have NOISYREQ set you can also watch for VANILLAKEY
events and let the user press 'O' or 'C' to mean OK or CANCEL on the 
requester. Anyway, when the message is received, if it is a gadget message
then the iaddress field contains a pointer to the gadget struct that was
clicked upon. You can proabably take it from their. 


--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.