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From: lucas@amiga.UUCP (David M. Lucas)
Newsgroups: net.micro.amiga
Subject: Re: help with Gadgets
Message-ID: <1411@amiga.amiga.UUCP>
Date: Tue, 15-Jul-86 20:23:59 EDT
Article-I.D.: amiga.1411
Posted: Tue Jul 15 20:23:59 1986
Date-Received: Wed, 16-Jul-86 04:58:38 EDT
References: <1925@sdcsvax.UUCP> <1408@amiga.amiga.UUCP> <1409@amiga.amiga.UUCP> <1410@amiga.amiga.UUCP>
Reply-To: lucas@dudley.UUCP (David M. Lucas)
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 72

Keywords: TOGGLESELECT GADGETS

POSTED FOR ROB PECK........



Jim Mackraz had suggested that the RemoveGadget(), deselect, then AddGadget()
would work properly under 1.1 to autodeselect a gadget based on the 
selection of another one (followed by a RefreshGadgets()...) to rerender
things correctly.  

	(note... not a critique of what he said, just additional 
	         info re 1.1 gadget rendering)

Unfortunately, under 1.1 the rendering of a gadget 
under 1.1 sometimes causes problems.  For example, if a gadget is highlighted 
(GADGHCOMP), calling RefreshGadgets can cause the highlighted gadget to 
disappear since 1.1 does not realize that the gadget has already been 
drawn.... it first draws the gadget in its unhighlighted state, then 
complements the select box.  In the case of a text only gadget, already 
selected, means that it draws the text in (effectively creating a blank 
highlighted box) then with the final step complements the select box 
(effectively erasing the gadget completely).   On receiving a REFRESHWINDOW
event, my own workaround (1.1 only) is to ReadPixel on a pair of gadgets, 
one of which is selected.  If, for the one selected, there is no 
highlighting visible to ReadPixel (upper lefthand corner of the select box) 
then I issue RefreshGadgets again.

Re the deselecting under 1.1, I've found a reasonable approach for 
me is:

		if a gadget is not selected, then set its toggleselect flag.
		if a gadget gets selected, reset its toggleselect flag.

			(lets the system do the highlighting for you,
			 resetting the flag prevents system from 
			 deselecting the same gadget on a second 
			 click)

		on GADGETDOWN, if selected, for all other gadgets that 
			are associated with this one that should auto 
			deselect:
				
				i = RemoveGadget each item in turn, then:
				set its toggleselect flag as noted above,
				if SELECTED, then reset SELECTED flag 
					and complement the select box
					myself.  I believe its ok to 
					do this because I removed the 
					gadget and now own it for the 
					moment... the system doesn't have
					it back until I give it back.
				AddGadget( gadget, i , window) this gadget

		then there is no need for refresh gadgets while handling
		the gadget list.  

The only time that RefreshGadgets would be needed then would be on a 
RefreshWindow event, watching out for the accidental (1.1 only) 
derendering as noted at the top of this message.   (This doesn't happen
under 1.2).

Hope this helps.

robp.
           

Disclaimer... it worked for me... what can I say.

Reply address:  (dont know exactly how, but I am at the WELL, userid: robp)
		 I just come in here sometimes to marvel at the new
		 software releases and say hello.