Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!usc!snorkelwacker!mintaka!oliveb!amiga!jimm
From: jimm@amiga.UUCP (Jim Mackraz)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Gadget help wanted
Message-ID: <5200@amiga.UUCP>
Date: 12 Feb 90 19:42:49 GMT
References: <1039LK-KARI@FINTUVM> <23@tmiuv0.uucp> <25d085dd:842.4comp.sys.amiga.tech;1@tronsbox.UUCP>
Reply-To: jimm@superman.UUCP (Jim Mackraz)
Organization: Commodore-Amiga Inc, Los Gatos CA
Lines: 39

In article (HIM) writes:
)>>    2. If I AddGadget() a gadget and then later on RemoveGadget() it, it will
)>>    be impossible to select it, but it won't disappear from the display even
)>>    though I call RefreshGadgets() immediately after the RemoveGadget().
)
)You have to call RemakeDisplay() I think .. that should make 100% sure
)that the screen reflects ONLY what should be there.

Yow, is that ever wrong.  yeeussh.
Intuition V1.3 and earlier has no support for erasing gadgets, so you
just have to do it yourself.  For most situations, I think something
like this will work:

SetAPen( window->RPort, 0 );
RectFill( window->RPort, g->LeftEdge, g->TopEdge,
	g->LeftEdge + g->Width - 1, g->TopEdge + g->Height - 1 );

If the gadget is GRELBOTTOM or something like that, you have to
do more work.  Likewise if it's in a requester or gimmezerozero border.

	jimm

PS: RemakeDisplay() recalculates all intermediate and hardware copper list
for the viewports of Intuition's screens.  It has no effect whatsoever
on the contents any bitmap, just the display instructions to get those
bitmaps displayed.

)Kenneth J. Jamieson: Xanadu Enterprises Inc. "Professional Amiga Software"

... which software is undoubtedly wonderful but probably doesn't
use RemakeDisplay() ;^)

	jimm

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