Re: [gtkmm] List/Treestore with external data

[Christer Palm <palm nogui se>]

Hi!

Hagen Möbius wrote:
>  Is there a way to make the TreeStore depend on external
> data? or Has anybody already implemented a derieved Store that does?

Yes. You can make your own TreeStore by "just" implementing the 
TreeModel interface, just as TreeStore and ListStore themselves do.

There are some limitations, though. Your TreeModel implementation must 
"freeze" its internal representation of the tree while the TreeView is 
working on it, so it won't work if your TreeModel changes as a result of 
"browsing" it or if it's updated by another thread or other asynchronous 
external events, unless you can hold back those updates until the gtkmm 
thread enters the "idle loop". In reality, this often means that you 
need to keep a copy of the tree anyway, so you might not gain anything 
from making your own TreeModel implementation.

--
Christer Palm