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Editorial Team
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Asked: 2026-05-12T19:33:10+00:00

I’m trying to update the input of JFace TreeViwer periodically using setInput() method. Also

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I’m trying to update the input of JFace TreeViwer periodically using setInput() method. Also I use the 

viewer.setExpandedElements(expandedElements);
viewer.setExpandedTreePaths(expandedTreePaths);

methods to save the state of the tree. But after each setInput() call the TreeViewer flickers. How can avoid from flickering ?

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1 Answer

  1. Editorial Team

    Is the actual input changing? If not you can call refresh() instead… or ideally use TreeViewers add/remove/update methods to avoid having to rebuild the entire tree.

    You could try calling viewer.getTree().setRedraw(false) before the calls to setExpand, and then viewer.getTree().setRedraw(true) after.

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