listmultiplechoicepage.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * 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.examples.compref;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.apache.wicket.IClusterable;
import org.apache.wicket.examples.WicketExamplePage;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.ListMultipleChoice;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.model.CompoundPropertyModel;


/**
 * Page with examples on {@link org.apache.wicket.markup.html.form.ListMultipleChoice}.
 * 
 * @author Eelco Hillenius
 */
public class ListMultipleChoicePage extends WicketExamplePage
{
	/** available sites for selection. */
	private static final List SITES = Arrays.asList(new String[] { "The Server Side", "Java Lobby",
			"Java.Net" });

	/** available choices for large selection box. */
	private static final List MANY_CHOICES = Arrays.asList(new String[] { "Choice1", "Choice2",
			"Choice3", "Choice4", "Choice5", "Choice6", "Choice7", "Choice8", "Choice9", });

	/**
	 * Constructor
	 */
	public ListMultipleChoicePage()
	{
		final Input input = new Input();
		setModel(new CompoundPropertyModel(input));

		// Add a FeedbackPanel for displaying our messages
		FeedbackPanel feedbackPanel = new FeedbackPanel("feedback");
		add(feedbackPanel);

		// Add a form with an onSubmit implementation that sets a message
		Form form = new Form("form")
		{
			protected void onSubmit()
			{
				info("input: " + input);
			}
		};
		add(form);

		// Add a multiple list choice component that uses the model object's
		// 'site'
		// property to designate the current selection, and that uses the SITES
		// list for the available options.
		// Note that our model here holds a Collection, as we need to store
		// multiple values too
		ListMultipleChoice listChoice = new ListMultipleChoice("sites", SITES);
		form.add(listChoice);

		listChoice = new ListMultipleChoice("choices", MANY_CHOICES)
		{
			/**
			 * @see org.apache.wicket.markup.html.form.AbstractChoice#isDisabled(java.lang.Object,
			 *      int, java.lang.String)
			 */
			@Override
			protected boolean isDisabled(Object object, int index, String selected)
			{
				if (index == 1)
					return true;
				return super.isDisabled(object, index, selected);
			}
		};
		listChoice.setMaxRows(5);
		form.add(listChoice);
	}

	/** Simple data class that acts as a model for the input fields. */
	private static class Input implements IClusterable
	{
		/** the selected sites. */
		public List sites = new ArrayList();

		/** the selected choices. */
		public List choices = new ArrayList();

		/** adds pre-selected items to the choices list */
		public Input()
		{
			choices.add("Choice3");
			choices.add("Choice4");
			choices.add("Choice5");
		}

		/**
		 * @see java.lang.Object#toString()
		 */
		public String toString()
		{
			return "sites = '" + listAsString(sites) + "', choices='" + listAsString(choices) + "'";
		}

		private String listAsString(List list)
		{
			StringBuffer b = new StringBuffer();
			for (Iterator i = list.iterator(); i.hasNext();)
			{
				b.append(i.next());
				if (i.hasNext())
				{
					b.append(", ");
				}
			}
			return b.toString();
		}
	}

	/**
	 * Override base method to provide an explanation
	 */
	protected void explain()
	{
		String html = "<select wicket:id=\"sites\">\n" + "    <option>site 1</option>\n"
				+ "    <option>site 2</option>\n" + "</select>\n"
				+ "<select wicket:id=\"choices\">\n" + "    <option>choice 1</option>\n"
				+ "    <option>choice 2</option>\n" + "</select>";
		String code = "&nbsp;&nbsp;&nbsp;&nbsp;// Add a multiple list choice component that uses the model object's 'site'\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;// property to designate the current selection, and that uses the SITES\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;// list for the available options.\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;// Note that our model here holds a Collection, as we need to store\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;// multiple values too\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;ListMultipleChoice siteChoice = new ListMultipleChoice(\"sites\", SITES);\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;form.add(siteChoice);\n"
				+ "\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;ListMultipleChoice manyChoice = new ListMultipleChoice(\"choices\", MANY_CHOICES).setMaxRows(5);\n"
				+ "&nbsp;&nbsp;&nbsp;&nbsp;form.add(manyChoice);";
		add(new ExplainPanel(html, code));

	}
}