Question

I’m new in the java world, so I’m sorry if my question is trivial.

I’m developing a Eclipse view part, and I’m filling a SWT tree view with the following data structure. All data is in memory:

Node1
   Child1
   Child2
Node2
   Child1
   ...
   Child2915

I think that is not a very big tree, but it is slow being drawn (10 seconds). I have manage trees in .NET with more than 10.000 elements and it loaded smoothly. I don’t know if I’ve implemented the code, but the same problem appeared in .NET if I did not call BeginUpdate() - EndUpdate().

Must I call something similar in Java/SWT? Any other tips about why the tree is so slow?

Answer 1

Finally, I used setRedraw(boolean value) after calling refresh in my TreeViewer.

public void refresh() {
    try {
        mTreeViewer.getControl().setRedraw(false);
        mTreeViewer.refresh(true);
        mTreeViewer.expandAll();
    }
    finally {
        mTreeViewer.getControl().setRedraw(true);
    }
}