CellTree - which nodes are open or closed on it?

[Vasi, Sándor]

I have a cellTree with few nodes.
I need to send to the server side which nodes are open on the tree, and which are closed.

I was thinking on two solutions, but i have problem with both.

1. Walk the cellTree and double-check all the nodes if they are open or closed.
My problem with this is that i dont know, how to walk the tree.
I can get it's root element from the CellTree by calling it's tree.getRootTreeNode() method,
but i cant find any way how to get the rootNode's children.
http://google-web-toolkit.googlecode.com/svn/javadoc/2.1/com/google/gwt/user/cellview/client/TreeNode.html
The TreeNode interface does not have a TreeNode getChild(int i) method.

2. Assume, that all children are closed / opened, and catch the close / open node event, and save it's state in a variable.
I do not know if there is any kind of event that can deal with this user activity.

What's your opinion and how to fix this issues?

Regards,
Sandor

[Patrice De Saint Steban]

It's not a good solution, but when you open a tree node with setChildOpen(), the method return the Child TreeNode :

public TreeNode setChildOpen(int index, boolean open, boolean fireEvents) {

      assertNotDestroyed();

      checkChildBounds(index);

      CellTreeNodeView<?> child = nodeView.getChildNode(index);

      return child.setOpen(open, fireEvents) ? child.treeNode : null;

}

The setOpen() return True only when the TreeNode is not a leaf and is closed, ans you ask to open the node.

[Thomas Broyer]

...which leads to the alternate solution: add an OpenHandler and a CloseHandler to the CellTree.

[jabal]

Today I had almost the same issue.. :-)

It seems that browsing the model of the CellTree is almost impossible
from the side of a SelectionModel or a DefaultSelectionEventManager. I
inherited from DefaultSelectionEventManager and tried to override
doMultiSelection(..) but from that method I could not access the tree
data as it is hidden by the HasData<T> interface. When debugging the
instance of this interface is a CellTreeNodeView$NodeCellList but is a
private inner class that cannot be accessed.. :-(

Regards,
JB

On Feb 14, 11:46 am, Vasi, Sándor <sa...@inlineskate.hu> wrote:
> I have a cellTree with few nodes.
> I need to send to the server side which nodes are open on the tree, and
> which are closed.
>
> I was thinking on two solutions, but i have problem with both.
>
> 1. Walk the cellTree and double-check all the nodes if they are open or
> closed.
> My problem with this is that i dont know, how to walk the tree.
> I can get it's root element from the CellTree by calling it's
> tree.getRootTreeNode() method,

> but i cant find any way how to get the rootNode's children.http://google-web-toolkit.googlecode.com/svn/javadoc/2.1/com/google/g...