Is there a way to wrap text in a tree viewer (Eclipse) (Not a simple Tree)

Question

viewer.getControl().addListener(SWT.MeasureItem, new Listener() {

            @Override
            public void handleEvent(Event event) {
                TreeItem item = (TreeItem)event.item;
                String text = getText(item, event.index);
                Point size = event.gc.textExtent(text);
                event.width = size.x;
                event.height = Math.max(event.height, size.y);
            }
        });

In the above code snippet the listener is added but it is not coming to handleEvent method at all.

Answer 1

For TreeViewer do not try to add Listeners as that will interfere with the operation of the viewer.

To draw the lines yourself use a Label Provider which extends OwnerDrawLabelProvider and implement the measure, erase and paint methods.