[JavaFX] 一度だけイベントハンドラー

EventUtils.java

public static <A extends Node, B extends Event> void addOnetimeEventHandler(
	final A targetNode,
	final EventType<B> eventType,
	final ProxyEventHandler proxyHandler) {
	targetNode.addEventHandler(eventType, new EventHandler<B>() {
		@Override
		public void handle(B event) {
			Node node = (Node) event.getTarget();
			node.removeEventHandler(eventType, this);
			proxyHandler.handle(node);
		}
	});
}
 
public static interface ProxyEventHandler {
	void handle(EventTarget target);
}