Eclipse Community Forums: JFace » How can I programmatically expand items in a TreeViewer?

Home » Eclipse Projects » JFace » How can I programmatically expand items in a TreeViewer?

How can I programmatically expand items in a TreeViewer? [message #1200466]

Thu, 21 November 2013 03:54

Eclipse User

I have a TreeViewer with an ILazyTreeContentProvider. I want to control the expansion of the top-level tree items: Initially they are unexpanded, but when an Action "Expand" is selected, the item should be expanded.

In the action.run() I currently do

final EntityTreeNode projectNode = (EntityTreeNode) ((ITreeSelection) 
    viewer.getSelection()).getFirstElement();
// notify the content provider that the node should be expanded; it creates child nodes 
// and updates the child count and calls viewer.setChildCount
((LazyEntityModelViewContentProvider) viewer.getContentProvider()).expandProject(projectNode);
viewer.expandToLevel(projectNode, 2);                   
viewer.refresh(projectNode);

But the node is not expanded. It should at least change it's icon to show that it has children..

Previous Topic:	pre-submit validation of controls
Next Topic:	[Databinding] Bind a bean with observable values as properties to table

Goto Forum:

-=] Back to Top [=-

Current Time: Sat Jul 05 14:10:04 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter