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

Thu, 21 November 2013 08:54

Martin Schröder

Messages: 3
Registered: June 2013

Junior Member

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..

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