Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!oliveb!sun!pepper!cmcmanis
From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga
Subject: Re: Gadgets question
Message-ID: <40497@sun.uucp>
Date: 29 Jan 88 23:04:50 GMT
References: <4830003@hpiacla.HP.COM>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 51

In article <4830003@hpiacla.HP.COM> jimg@hpiacla.HP.COM (Jim Garrison) writes:
>Howdy!
>
>I am a novice Amiga and 'C' programmer and I've been having this problem
>getting Gadgets to work right.  I'd really appreciate it if anyone out 
>there could point me in the right direction.  I am also having a problem
>with ASDG's FaccII.

>Problem #1 -- Gadgets
>
>I am trying to use Gadgets to request some information in my program and a
>couple of the Gadgets I am using need to be Mutually exclusive.

Sorry, I can't help with the Facc II problem but Gadgets are something I 
have played with quite a bit. Basically, mutual exclude does not work
for gadgets. It can be made to work fairly simply though, so all is not 
lost. The technique I use is as follows, in the Gadget structure is a 
UserData pointer, I point this at other gadgets that are in the same
mutual exclude group in a loop so my data structures look like this :

      +----------+      +----------+      +----------+      +----------+
  +-->| Gadget 1 |  +-->| Gadget 2 |  +-->| Gadget 3 |  +-->| Gadget n |
  |   +----------+  |   +----------+  |   +----------+  |   +----------+
  |   | UserData |--+   | UserData |--+   | UserData |--+   | UserData |--+
  |   +----------+      +----------+      +----------+      +----------+  |
  +-----------------------------------------------------------------------+

When you get a IntuiMessage of class GADGETDOWN (or GADGETUP if that is 
how you are selecting your gadgets) Then you check the UserData pointer
to see if it is non-null. If so you loop through looking for the 'other'
selected gadget and deselect it. Like so :

  struct Gadget *TempGad, *CurrentGad;

	CurrentGad = (struct Gadget *)msg->IAddress;
	if (!(CurrentGad->UserData)) {
	  for (TempGad = CurrentGad; TempGad != CurrentGad; 
		TempGad = (struct Gadget *)(TempGad->UserData))
	    if (TempGad->Flags & SELECTED) {
		TempGad->Flags &= ~SELECTED;
		RefreshGList(MyWindow,TempGad,1);
	    }
	}

/* Check the parameters to RefreshGList, I don't have an Amiga handy at the
   moment. */


--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.