Re: [gef-dev] Z Order API Change

[Ian Bull <irbull@xxxxxxxxxx>]

Randy, I'm /*slap my forehead a few times*/ an idiot... you're right.

I am just using Draw2D, and for some reason I had it in my head that I 
should not touch the children collection outside of Figure class (like 
it was some immutable object).  Please ignore my post, I'm just going to 
sit here for a few minutes and feel stupid and then I will fix this in 
my code. :)

Also, if you want to see a pretty neat screenshot that I did entirely 
with Draw2D, checkout the post I wrote yesterday for my summer of code 
project [1].  (Even with a few thousand nodes (nested) it is pretty snappy).

[1] http://irbull.blogspot.com/2007/07/node-goes-up-node-goes-down.html

thanks again Randy and Anthony,
Ian

Randy Hudson wrote:
> I couldn't figure out whether Ian was using draw2d alone, or with GEF.  If
> you just have a figure, it gives you its children by reference, so nothing
> prevents you from moving the children forward or backwards in that list,
> and manually invoking the repaint.
>
> It gets more complicated if editparts are involved since the default
> implementation always tries to maintain the same order between child
> figures and child editparts (which are assumed to be in sync with an
> ordered model as well).
>
> -Randy
>
>
>
>                                                                            
>              Anthony Hunter                                                
>              <anthonyh@xxxxxx.                                             
>              com>                                                       To 
>              Sent by:                  GEF development                     
>              gef-dev-bounces@e         <gef-dev@xxxxxxxxxxx>               
>              clipse.org                                                 cc 
>                                                                            
>                                                                    Subject 
>              07/13/2007 08:51          Re: [gef-dev] Z Order API Change    
>              AM                                                            
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>              Please respond to                                             
>               GEF development                                              
>              <gef-dev@eclipse.                                             
>                    org>                                                    
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>
> Hi Ian,
>
> Z-order is something a client would support in his diagram. Since all
> diagrams need not support z-order, a breaking API change to the IFigure API
> is not appropriate.
>
> Why would you not be able to create your own interface to add to your
> figure hierarchy, is something blocking this?
>
> Cheers...
> Anthony
> --
> Anthony Hunter mailto:anthonyh@xxxxxxxxxx
> Software Development Manager: Eclipse Open Source Components
> IBM Rational Software: Aurora / Modeling Tools
> Phone: 613-591-7037
>
>
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>   |Ian Bull <irbull@xxxxxxxxxx>
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>   |GEF development <gef-dev@xxxxxxxxxxx>
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>   |12/07/2007 02:52 PM
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>   |[gef-dev] Z Order API Change
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>
>
> This is more of a development question, rather than a usage question, so
> I am posting it here.
>
> I am wondering if the IFigure API can be changed to add a
> changeZOrder(IFigure child, int position)?  I have a graph, and when I
> select a node I would like it to appear on top. The usual method (remove
> the node, then add it back) doesn't work in my case.  I have 25 nodes
> (containers) each with 256 children ~= 6400 nodes. Removing a container
> (and firing all the listeners, etc...) takes about 1 1/2 seconds, a
> considerable lag for a selection.  I have experimented with simply
> moving the container in the array of children (then calling invalidate /
> repaint) and the performance is much better (since there is no need for
> all the notifications)?
>
> I will open a bug report, and even get a patch ready if this is
> considered a good idea. However, I have a feeling that GEF doesn't
> support this for a reason.
>
> cheers,
> Ian
>
>
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