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Expanding all nodes in a tree viewer [message #653213]

Tue, 08 February 2011 21:41

SBS

Messages: 57
Registered: January 2011

Member

In the createPartControl() method of a TreeViewer I am trying to create the viewer, load the content and then expand every item in the tree but it is not working.

The code looks like this:

final Tree tree = viewer.getTree();
for (final TreeItem item : tree.getItems()) {
    item.setExpanded(true);
}

The problem is that it seems only the top level items have been created properly at this point as I am getting null pointer exceptions in my label provider when I try to access the item's data for all nested items.

So what's the correct place, time or procedure to expand all nodes at a point where they have all been created and properly initialised?

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Re: Expanding all nodes in a tree viewer [message #653221 is a reply to message #653213]

Tue, 08 February 2011 21:47

Thomas Schindl

Messages: 6255
Registered: July 2009

Senior Member

Yes. Items are created lazily. You can use TreeViewer#expandAll() or th
TreeViewer#expandToLevel().

Tom

Am 08.02.11 22:41, schrieb SBS:
> In the createPartControl() method of a TreeViewer I am trying to create
> the viewer, load the content and then expand every item in the tree but
> it is not working.
>
> The code looks like this:
>
> final Tree tree = viewer.getTree();
> for (final TreeItem item : tree.getItems()) {
> item.setExpanded(true);
> }
>
> The problem is that it seems only the top level items have been created
> properly at this point as I am getting null pointer exceptions in my
> label provider when I try to access the item's data for all nested items.
>
> So what's the correct place, time or procedure to expand all nodes at a
> point where they have all been created and properly initialised?

Report message to a moderator