Re: [Evolution-hackers] ETree and gal

[DINH Viêt Hoà <dinh viet hoa free fr>]

Not Zed wrote :

> > > >   I have some fixes for the example of ETree.
> > > > And I am planning to use ETree in my own application (because 
> > > > GtkTreeView/GtkTreeModel) have huge performance problem.
> > > > I am also planning to add some API (either by not modifying libgal or by 
> > > > modifying libgal). I would like to know if development of libgal is 
> > > > opened to changes ?
> > > 
> > > We are about to kill development of gal outside of Evolution because no
> > > one else is currently using it.
> > 
> > I was about to use that in my (open source) application.
> > Should I duplicate the code of GAL into my code ?
> 
> Ugh.  I'd highly recommend against it.  You're entering a world of
> pain ...
> 
> We want to try to kill etree as soon as we can; i'm almost inclined to
> just drop in gtktreeview ASAP, and then hope that this just forces the
> gtk+ maintainers to fix the performance issues.
> 
> Apart from multiline select scaling miserably, if you use a custom
> model, and not the weird supplied models the performance isn't that much
> worse than etable.

GtkTreeView/GtkTreeModel design is broken since GtkTreePath is based on 
indexes of elements in the table. That means that for each element, you 
have to maintain its index: When you want to add or remove an element, 
you have to update all the indexes of the elements of the sibling nodes. 
Imagine you have a big amount of sibling nodes, performances are very 
bad. The behavior is more correct with ETree.
Since this broken design of GtkTreePath is related to the API, I have a 
doubt about GTK developers will change this.

I guess either I have to make my own treeview/treemodel based 
on ETree ...

> > GAL had the advantage of being LGPL and not GPL.
> 
> As opposed to?  Evolution?  I dont see the files changing license, but I
> also don't see it being usable outside of the tree, if we can help it.

I am currently using it outside of Evolution.
I have to customize it a little but basically, it works.

-- 
DINH V. Hoa,

"tuning et dope, aucun rapport" -- b.