/**
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.waveprotocol.wave.client.widget.popup;

/**
 * Interface to be implemented by classes wanting notification of popup events.
 *
 */
public interface PopupEventListener {
  /** Called after the popup becomes visible */
  void onShow(PopupEventSourcer source);

  /** Called after the popup becomes invisible */
  void onHide(PopupEventSourcer source);

  /**
   * Convenience blank implementation to be used for subclassing.
   */
  public static class PopupEventListenerAdapter implements PopupEventListener {
    @Override
    public void onHide(PopupEventSourcer source) {
    }

    @Override
    public void onShow(PopupEventSourcer source) {
    }
  }
}