Re: [Java-gnome-developer] Problems with TreeView

[Andrew C. <an...@op...>]

On Sun, 2006-07-09 at 00:17 +0200, Keywan Najafi Tonekaboni wrote:
> Hi,
> 
> I have a application with groupchat window. I save the roster of the
> user, who are in the groupchat, in a TreeView. I use a ListStore with
> two columns (Pixbuf and String). 
> 
> I read the tutorial and create my ListStore/TreeView nearly exact as
> shown in the tutorial. 
> 
> Now I want to modify the rows in the TreeView. I wonder how I could get
> a specified row.

You need to hunt down the row you want to modify, which means getting a
TreeIter that points at it. How do you do that?

Assuming you do not have a TreeRowReference kicking around that points
at it, then what you need to do is iterate through the ListStore to find
your row.

	TreeIter pointer = model.getFirstIter();

Then, as you loop through, you just call getValue() on a particular
column and see if its the one you want, and if not,

	pointer = model.getNextIter();

An example of this is line 601 of 
http://research.operationaldynamics.com/source/darcsweb/?r=objective;a=headblob;f=/src/accounts/ui/TransactionListView.java#l595

Incidentally, this is half the reason one usually stores a
DataColumnObject in the ListStore with a reference to the domain object
we're modelling - easier to just test the result of getValue() == obj.

If you're reacting to a selection event, you can get a TreePath from the
Event and from there a TreeIter. If you're reacting to an activate, you
can get a TreeIter right off of the Event... and from there quickly lift
the domain object you're modelling and then carry on with business logic
from there.

AfC
London

-- 
Andrew Frederick Cowie

Technology strategy, managing change, establishing procedures,
and executing successful upgrades to mission critical business
infrastructure.

http://www.operationaldynamics.com/

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