ChoiceUIHandler.java :  » Web-Framework » swingweb » org » onemind » swingweb » client » gwt » ui » Java Open Source

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swingweb » org » onemind » swingweb » client » gwt » ui » ChoiceUIHandler.java
/*
 * Copyright (C) 2004 TiongHiang Lee
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not,  write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Email: thlee@onemindsoft.org
 */

package org.onemind.swingweb.client.gwt.ui;

import java.util.List;
import org.onemind.swingweb.client.core.AbstractClient;
import org.onemind.swingweb.client.dom.DomNode;
import com.google.gwt.user.client.ui.*;
public class ChoiceUIHandler extends ComponentUIHandler implements ChangeListener
{

    public void onChange(Widget sender)
    {
        handleEvent(sender, null);
    }

    public ChoiceUIHandler(AbstractClient client)
    {
        super(client);
    }

    public Object createComponentInstance(Object parent, DomNode element)
    {
        ListBox lb = new ListBox();
        lb.setVisibleItemCount(1);
        lb.setMultipleSelect(false);
        return lb;
    }

    protected void populateItems(ListBox choice, DomNode element)
    {
        choice.clear();
        List nodes = element.getChildNodes();
        int count = 0;
        for (int i = 0; i < nodes.size(); i++)
        {
            DomNode childNode = (DomNode) nodes.get(i);
            if ("item".equals(childNode.getName()))
            {
                DomNode childElement = (DomNode) childNode;
                String value = childElement.getAttribute("value");
                String selected = childElement.getAttribute("selected");
                choice.addItem(value);
                if (Boolean.valueOf(selected).booleanValue())
                {
                    choice.setSelectedIndex(count);
                }
                count++;
            }
        }
    }

    public Object updateUI(Object com, DomNode element)
    {
        ListBox choice = (ListBox) com;
        populateItems(choice, element);
        return super.updateUI(com, element);
    }

    /** 
     * {@inheritDoc}
     */
    protected void registerListeners(Object com)
    {
        super.registerListeners(com);
        ((ListBox) com).addChangeListener(this);
    }

    protected void postEvent(Object sender, Object data)
    {
        ListBox c = (ListBox) sender;
        postEvent(c, String.valueOf(c.getSelectedIndex()), true);
    }
}
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