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From: warwick@cs.uq.oz.au (Warwick Allison)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: saving screen in a GEM app.
Message-ID: <981@uqcspe.cs.uq.oz.au>
Date: 25 Apr 91 08:33:49 GMT
References: <2991@shodha.enet.dec.com>
Sender: news@cs.uq.oz.au
Reply-To: warwick@cs.uq.oz.au
Lines: 38


	[ re multiple dialog boxes ]

>There are a couple of other ways to handle this. One that I use is to save the
>screen area under the dialog box when you put it up and restore it when you
>put it back, using the blit routines. Specifically, you can use the 
>vro_copyfm() routines. Or you can save each dialog box using the same technique
>and restore all of it when you get a redraw message. Or you can save the whole
>screen, although this uses 32K of memory.

The trouble with this is, you only get 1 level of nesting (or another 32K
every time you open another dialog on top of an old one!).

A far better, and easier method is to just redraw the form AFTER the nested
form is complete.  Just use objc_draw for this purpose.

I do recommend you read Tim Oren's ProGEM series - they are at atari.archive.

You asked about setting your own desktop object, here's how:

First, to set an object as the new desktop:
(note, this is hacked from Modula-2, so beware)

NewDesk=14
rsrc_gaddr(tree,FormNumber,&Form);
wind_set(0,NewDesk,Form,0);

To go back to the original desktop:

wind_set(0,NewDesk,0,0);


Warwick.
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