java-gnome-developer

[Java-gnome-developer] Problems with TreeView

[Tiago C. <cog...@li...>]

Apparently something got broken from 0.8 to 0.8.1 in what regards to the
TreeView component.
Considering the following defenitions:
DataBlockInt dataIndex = new DataBlockInt();
DataBlockString dataName = new DataBlockString();
DataBlockBoolean dataExtract = new DataBlockBoolean();
ListStore list = new ListStore(new DataBlock[]{dataIndex, dataExtract,
dataName});

While this still does not work properly (without showing a warning):
// To get wheter or not the item is selected
TreeIter i = list.getIter(String.valueOf(index));
return list.getValue(i, dataExtract);

Now this does not work too:
// Now to get the name of the item
TreeIter iter = list.getIter(String.valueOf(index));
return list.getValue(iter, dataName);

This used to work before, now i feel obligated to have a java copy of
the names in a List as i already do for the boolean field (extract or
not), getting these fields from the treeview generates the following
error:

(java-gnome:29591): GLib-GObject-WARNING **: gvalue.c:86: cannot
initialize GValue with type `gchararray', the value has already been
initialized as `gchararray'

I am going to try to find out through the diffs what broke this and
maybe we can get the bolean value to work too.

Tiago Cogumbreiro

[Java-gnome-developer] Problems with TreeView

[Keywan N. T. <li...@pr...>]

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. I want to retrieve a row by searching for a String
(Give me the row with the username "foo"). I looked into the JavaDocs,
searched the examples and even the GTK Tutorial, but I didn't understand
the C code.

Did anyone have a code example? Did I missed a tutorial or method in the
API? Should I use a TreeIter instead of a ListStore, even though I just
want a simple list?

Regards,

Keywan


-- 
Keywan Najafi Tonekaboni
http://www.prometoys.net

people@world:/# apt-get --purge remove dominion
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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/

Sydney   New York   Toronto   London

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

[Keywan N. T. <li...@pr...>]

Hi,

Am Sonntag, den 09.07.2006, 12:19 +0100 schrieb Andrew Cowie:
> 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.

Thanks. It works know. This was exactly what I need. 

> 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.
> 
When I understand you correctly I guess I have did this. 

> 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.

Unfortunately not. To react on a selection is covered by the
tutorial[1]. Maybe I manage to improve it with your example at the and
of the week. Do you think this would be a helpful part in the tutorial?

Thanks a lot,

Keywan

[1]
http://java-gnome.sourceforge.net/cgi-bin/bin/view/Main/TreeViewTutorial

-- 
Keywan Najafi Tonekaboni
http://www.prometoys.net

people@world:/# apt-get --purge remove dominion
After unpacking world will be freed.
You are about to do something potentially beneficial
To continue type in the phrase 'Yes, do as We say!'

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

[Tiago C. <cog...@li...>]

On Seg, 2003-11-17 at 09:14, Tiago Cogumbreiro wrote:
> Apparently something got broken from 0.8 to 0.8.1 in what regards to the
> TreeView component.
> Considering the following defenitions:
> DataBlockInt dataIndex = new DataBlockInt();
> DataBlockString dataName = new DataBlockString();
> DataBlockBoolean dataExtract = new DataBlockBoolean();
> ListStore list = new ListStore(new DataBlock[]{dataIndex, dataExtract,
> dataName});
> 
> While this still does not work properly (without showing a warning):
> // To get wheter or not the item is selected
> TreeIter i = list.getIter(String.valueOf(index));
> return list.getValue(i, dataExtract);
> 
> Now this does not work too:
> // Now to get the name of the item
> TreeIter iter = list.getIter(String.valueOf(index));
> return list.getValue(iter, dataName);
> 
> This used to work before, now i feel obligated to have a java copy of
> the names in a List as i already do for the boolean field (extract or
> not), getting these fields from the treeview generates the following
> error:
> 
> (java-gnome:29591): GLib-GObject-WARNING **: gvalue.c:86: cannot
> initialize GValue with type `gchararray', the value has already been
> initialized as `gchararray'
> 
> I am going to try to find out through the diffs what broke this and
> maybe we can get the bolean value to work too.
> 
> Tiago Cogumbreiro
As you might've guessed the problems are with ListStore and not with
TreeView, sry ;)