ShowEvent.java

package com.eas.ui.events;

import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.user.client.ui.UIObject;

public class ShowEvent extends GwtEvent<ShowHandler> {

	/**
	 * Handler type.
	 */
	private static Type<ShowHandler> TYPE;

	/**
	 * Fires a close event on all registered handlers in the handler manager. If
	 * no such handlers exist, this method will do nothing.
	 * 
	 * @param <T>
	 *            the target type
	 * @param source
	 *            the source of the handlers
	 * @param target
	 *            the target
	 */
	public static void fire(HasShowHandlers source, UIObject target) {
		if (TYPE != null) {
			ShowEvent event = new ShowEvent(target);
			source.fireEvent(event);
		}
	}

	/**
	 * Gets the type associated with this event.
	 * 
	 * @return returns the handler type
	 */
	public static Type<ShowHandler> getType() {
		return TYPE != null ? TYPE : (TYPE = new Type<>());
	}

	private final UIObject widget;

	/**
	 * Creates a new close event.
	 * 
	 * @param aWidget
	 *            the target
	 */
	protected ShowEvent(UIObject aWidget) {
		widget = aWidget;
	}

	@Override
	public final Type<ShowHandler> getAssociatedType() {
		return TYPE;
	}

	/**
	 * Gets the target.
	 * 
	 * @return the target
	 */
	public UIObject getWidget() {
		return widget;
	}

	@Override
	protected void dispatch(ShowHandler handler) {
		handler.onShow(this);
	}
}