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Home » Eclipse Projects » GEF » Guidance needing on writing a draw2d LayoutManager
Guidance needing on writing a draw2d LayoutManager [message #216132] Mon, 15 May 2006 11:25 Go to next message
Paul E. Keyser is currently offline Paul E. Keyser
Messages: 878
Registered: July 2009
Senior Member
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R3.1.1

So, I've looked at: (1) the APIs of LayoutManager and its implementations, and their javadocs, (2)
the GEF-FAQ (http://wiki.eclipse.org/index.php/GEF_Developer_FAQ), (3) the one draw2d article
( http://www.eclipse.org/articles/Article-GEF-Draw2d/GEF-Draw2 d.html) -- which was quite useful as
far as it went (I also looked at some of the other articles, but they seemed to assume rather than
explain draw2d); (4) several dozen threads on this newsgroup regarding layout-managers; and (5) the
EMF-GEF Redbook, linked to from the GEF Docco page.

None give anything like useful advice on how to write a layout-manager. I'd need to know what those
methods in LayoutManager *mean* (its javadocs do *not* explain that) in order to be able to port my
algo to that interface. The existing example layouts don't really clarify matters, at least not for
me. I know what I want to have the layout do, what I do not understand is how to get the
LayoutManager API to do that.

BTW, for all I know, one or another of the existing LayoutManager implementations might work, but
even that is not clear from their docco; I *can* tell that ToolbarLayout would *not* work. I need a
kind of tree-oid layout (really a forest), in which the roots could be laid out along any of the
four edges of the graph canvas, and then the child elements of the tree-model would be laid out
next, and so on, but each parent would have a width spanning the total width (plus gaps) of its
children. See attached fantasy screen-shot, courtesy of MS-Pain. Maybe I could hack XYLayout (if I
had any idea of how it works), or some other?

thanks,
Paul


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Re: Guidance needing on writing a draw2d LayoutManager [message #217409 is a reply to message #216132] Mon, 05 June 2006 10:17 Go to previous message
Paul E. Keyser is currently offline Paul E. Keyser
Messages: 878
Registered: July 2009
Senior Member
FWIW, I managed to make XY-Layout work, by creating appropriate constraint rectangles; doesn't
really address the general issue though ...

Paul
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