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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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/*
 * 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.wicket;

import org.apache.wicket.markup.IMarkupFragment;


/**
 * Demarcates components that act as a root can dequeue children. These are usually components with
 * associated markup since the markup is needed to dequeue.
 * 
 * It is also important to note that components queued outside of a region cannot be dequeued into
 * it since regions act as roots for the dequeue process because they contain the markup. As such,
 * for example, a component queued in a page cannot be dequeued into a page child that is a panel
 * because a panel is an {@link IQueueRegion}.
 * 
 * @author igor
 * 
 */
public interface IQueueRegion
{
	/**
	 * Creates a new {@link DequeueContext} that will be used to dequeue children of this region.
	 * 
	 * Usually containers will create a context with their associated markup by getting it via
	 * {@link MarkupContainer#getAssociatedMarkup()}, but components that do not render markup in a
	 * standard way (such as repeaters and borders) may choose to override this method to implement
	 * custom behavior for the dequeueing process.
	 */
	DequeueContext newDequeueContext();

	/**
	 * Starts component dequeueing on this {@link IQueueRegion}. This is the entry point into the
	 * dequeuing process, it creates the {@link DequeueContext} and delegates the operation to the
	 * {@link org.apache.wicket.MarkupContainer#dequeue(DequeueContext)} method which performs the
	 * actual dequeueing. The context's markup is retrieved using the {@link MarkupContainer#getAssociatedMarkup()}.
	 */
	void dequeue();
	
	/**
	 * Returns the markup to use for queuing. Normally, this is the markup of the component 
	 * implementing this interface.
	 * 
	 * @return the markup to use for queuing
	 */
	IMarkupFragment getRegionMarkup();
}