Eclipse TreeViewer/ViewPart background click

Question

I am developing a flashcard application using eclipse. I have a TreeViewer in a ViewPart, and I use it to display various categories. However, I cannot find a way to process a background click event. I do not have much experience with eclipse development, so maybe background is the wrong word.

I need something like this:

TreeViewer.setOnBackGroundClickListener(new ClickListener() {});

Screenshot

Answer 1

You must use the SWT layer:

TreeViewer.getTree().addMouseListener(new MouseListener() {...});

With this method I get notified of the click even outside the selection.