selecteditemconverter.java

非常接近C/S操作方式的Java Ajax框架－ZK 用ZK框架使你的B/S应用程序更漂亮更易操作。 官网：www.zkoss.org

/* SelectedItemConverter.java

{{IS_NOTE
	Purpose:
		
	Description:
		
	History:
		Tue Dec 12 15:43:28     2006, Created by Henri
}}IS_NOTE

Copyright (C) 2006 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
}}IS_RIGHT
*/
package org.zkoss.zkplus.databind;

import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listitem;
import org.zkoss.zul.ListModel;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.event.SelectEvent;

import java.util.Set;
import java.util.HashSet;


/**
 * Convert selected item to bean and vice versa.
 *
 * @author Henri
 */
public class SelectedItemConverter implements TypeConverter {
	//load, called on load-when:self.onInitRender again to avoid sequence
    public Object coerceToUi(Object val, Component comp) { 
    	Listbox lbx = (Listbox) comp;
    	if (val != null) {
    		ListModel model = lbx.getModel();
    		if (model != null) {
    			int index = model.indexOf(val);
    			if (index >= 0) {
    				Listitem item = lbx.getItemAtIndex(index);
    				if (item != null) {
	    				Set items = new HashSet();
	    				items.add(item);
	    				Events.postEvent(new SelectEvent("onSelect", lbx, items));
	    			}
    				return item;
    			}
    		}
    	}
    	return null;
    }
    
    public Object coerceToBean(Object val, Component comp) { //save
    	Listbox lbx = (Listbox) comp;
    	if (val != null) {
    		ListModel model = lbx.getModel();
   			return model != null ? model.getElementAt(((Listitem) val).getIndex()) : null;
    	}
   		return null;
    }
}