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From: higgin@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Question on PROP. gadgets using AUTOKNOB
Message-ID: <1466@cbmvax.cbmvax.cbm.UUCP>
Date: Wed, 25-Feb-87 23:25:25 EST
Article-I.D.: cbmvax.1466
Posted: Wed Feb 25 23:25:25 1987
Date-Received: Sat, 28-Feb-87 00:48:36 EST
References: <8702251843.AA10187@cory.Berkeley.EDU>
Reply-To: higgin@cbmvax.UUCP (Paul Higginbottom SALES)
Organization: Commodore Technology, West Chester, PA
Lines: 28

In article <8702251843.AA10187@cory.Berkeley.EDU> dillon@CORY.BERKELEY.EDU (Matt Dillon) writes:
$I'm working on a simple graphical flowcharting program and am using
$two proportional gadgets in the right and bottom borders to handle scrolling.
$Everything works properly.  The question is: What should I do with the entry in
$the Gadget structure for the Image?  INTUITION crashes if I set it to NULL,
$but when I set it to some arbitrary image, it doesn't seem to affect the
$proportional gadget at all.
$In otherwords, no matter what I set the Image to, I get a normal rectangular
$border around my prop gadget.  Now, I *want* a normal border, but do not
$understand why I need a dummy image to make it all work.
$Anybody have any ideas?
$		-Matt

Yes, Matt - I was puzzled by the for a while, too.  The answer is that
Intuition needs an Image structure attached to the gadget which IT uses (as
opposed to an application using it).
It (Intuition) needs to create its own version of dimensions, offsets, etc.
These get modified when you do the ModifyPropInfo() (I think that's the call...
been a while) or size the window (assuming you're using the relative sizing).
Since proportional gadgets will be represented identically (in terms of
imagery) to other gadgets by having an Image structure attached which Intuition
happens to fill in instead of the application program, these gadgets can
be updated / refreshed, etc without special [too much] special logic.

Hope this helps,
		Paul.

Disclaimer: The above might be utter bilge.