Re: 2D scrolling?

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#525

From: John Carlson
Date: Sat, 22 Aug 1992 08:35

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In article <1992Aug18.201020.10570@newsserver.rrzn.uni-hannover.de> patz@ipc1.rrzn.uni-hannover.de (Frank Patz) writes:
>InterViews 3.1 beta
>
>I've tried to code a 2D scrollbox "Viewer", based on TransformSetter
...
>After spending lots of hours with that code: Can it be done
>this way? If not, HOW can it be done?

I've spent a lot of time too, and mine still isn't perfect.  To handle
the cases where your allocation() isn't set, set an "allocated" flag
in ::allocate() and unset the flag in ::undraw().  My ::upper() and
::cur_length() methods test to see if the glyph has been allocated.  Your
::cur_length() method will have to do likewise, and use the Requisition
instead of the allocation.

	if (allocated) {
		return allocation().allotment(dimension).span();
	} else {
		Requisition r;
		request(r);
		return r.requirement(dimension).natural();
	}

John Carlson
carlson@yottzumm.tis.llnl.gov

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From: carlson@yottzumm.tis.llnl.gov (John Carlson)
Newsgroups: comp.windows.interviews
Subject: Re: 2D scrolling?
Message-ID: <134148@lll-winken.LLNL.GOV>
Date: 22 Aug 92 08:35:10 GMT
References: <1992Aug18.201020.10570@newsserver.rrzn.uni-hannover.de>
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