content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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.apache.causeway.viewer.wicket.model.hints;
  
  import org.apache.wicket.ajax.AjaxRequestTarget;
  
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  
  /**
   * All Causeway-related events subclass from this and fall into two categories.
   * <p>
   * Components that are raising events should create a subclass of
   * {@link org.apache.causeway.viewer.wicket.model.hints.CausewayEventLetterAbstract} (the letter)
   * and then {@link org.apache.wicket.Component#send(org.apache.wicket.event.IEventSink, org.apache.wicket.event.Broadcast, Object)}
   * as a {@link org.apache.wicket.event.Broadcast#EXACT} message to <tt>PageAbstract</tt>.
   * <p>
   * Then <tt>PageAbstract</tt> will wrap the letter into the
   * {@link org.apache.causeway.viewer.wicket.model.hints.CausewayEnvelopeEvent} (envelope) and
   * send as a {@link org.apache.wicket.event.Broadcast#BREADTH} to all its components.
   */
  @RequiredArgsConstructor
  public abstract class CausewayEventAbstract {
  
      /**
       * The {@link AjaxRequestTarget target}, if any, that caused this event to be generated.
       *
       * <p>
       * Typically populated, but not always...
       */
      @Getter private final AjaxRequestTarget target;
  
  }
  
  