beanlistcellrenderer.java

《j2ee开发全程实录》随书源码

package com.cownew.ctk.ui.swing;

import java.awt.Component;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;

import javax.swing.Icon;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

import org.apache.commons.beanutils.BeanUtils;

import com.cownew.ctk.common.ExceptionUtils;

public class BeanListCellRenderer implements ListCellRenderer, Serializable
{

	private JLabel label;

	private String displayProperty;

	public BeanListCellRenderer(String displayProperty)
	{
		super();
		this.displayProperty = displayProperty;
		label = new JLabel();
	}

	public Component getListCellRendererComponent(JList list, Object value,
			int index, boolean isSelected, boolean cellHasFocus)
	{
		label.setComponentOrientation(list.getComponentOrientation());
		if (isSelected)
		{
			label.setBackground(list.getSelectionBackground());
			label.setForeground(list.getSelectionForeground());
		} else
		{
			label.setBackground(list.getBackground());
			label.setForeground(list.getForeground());
		}

		if (value instanceof Icon)
		{
			label.setIcon((Icon) value);
			label.setText("");
		} else
		{
			label.setIcon(null);
			String displayValue = null;
			try
			{
				displayValue = BeanUtils.getProperty(value, displayProperty);
			} catch (IllegalAccessException e)
			{
				throw ExceptionUtils.toRuntimeException(e);
			} catch (InvocationTargetException e)
			{
				throw ExceptionUtils.toRuntimeException(e);
			} catch (NoSuchMethodException e)
			{
				throw ExceptionUtils.toRuntimeException(e);
			}
			label.setText((value == null) ? "" : displayValue);
		}

		label.setEnabled(list.isEnabled());
		label.setFont(list.getFont());
		//获得焦点时高亮显示
		Border focusBorder = UIManager
				.getBorder("List.focusCellHighlightBorder");
		//失去焦点时普通显示
		EmptyBorder emptyBorder = new EmptyBorder(1, 1, 1, 1);
		label.setBorder((cellHasFocus) ? focusBorder : emptyBorder);

		return label;
	}

}