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Need help with virtial tree viewer [message #309471]

Fri, 27 October 2006 14:36

Robert Berger

Messages: 2
Registered: July 2009

Junior Member

I need to display a tree with a managable number of top level (direct
children of the root) nodes, but a very large number of lower level nodes.
I changed my application to use SWT.VIRTUAL with an ILazyContent provider
and the performance boost was tremendous.

The problem is, I need to use TreeViewer.reveal() to programatically
scroll the viewer to a specific top level node. I do not use reveal on
lower level nodes that aren't direct children of the root.

In my current naive implementation, the reveal() call only works if the
user has already scrolled the viewer so the target object passed to
reveal() has been visible.

How can I fix this? What I probably need is a way to force the tree
viewer to do the callbacks to my content provider for all the children of
the root, while continuing to use lazy evaluation for the deeper nodes.

Robert Berger
Software Architect
bBerger Technologies, Inc.

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Re: Need help with virtial tree viewer [message #309479 is a reply to message #309471]

Fri, 27 October 2006 18:18

Robert Berger

Messages: 2
Registered: July 2009

Junior Member

I got the reveal() call to work by fixing a bug in my content provider's
getParent() method. However, reveal() with a model object as a parameter
is VERY slow; it seems to be doing a depth-first search, which negates the
performance advantage of SWT.VIRTUAL.

I suspect I need to pass a TreePath to reveal, but I can't get this to
work; the reveal() call does nothing. Is this form of reveal not supported
with SWT.VIRTUAL?

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