This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
TreeSelectionHandler's valueChanged event is being fired whenever I move the mouse over a node. That's a problem. I have some drag-and-drop logic, and when I drag something from a higher node to a lower node, the event is being fired whenever I pass over the in-between nodes on the way to the final drop location. My program has some code for validating the drop location, but I don't want that code to run simply because I moused over a node.