Java:Swing JComboBox,是否可以为列表中的每个项目提供隐藏数据? [英] Java: Swing JComboBox, is it possible to have hidden data for each item in the list?
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问题描述
JComponents可以使用 setName()
和 getName()
获取隐藏数据,对吗? JComboBox项目怎么样? (我指的是JComboBox中的项,而不是JComboBox本身)
JComponents can obtain hidden data using setName()
and getName()
, right? What about JComboBox items? (I'm referring to the items in the JComboBox, NOT the JComboBox itself)
如果我有一个JComboBox,在里面我怎么办?有一个用户名列表(例如),现在我想根据订单的方式为列表中的每个用户名设置'id'之类的东西,最好的方法是什么?
What if I have a JComboBox, and inside it I have a list of usernames (for example), now I want to have something like 'id' for each username in the list according to how they are ordered, what's the best way to do this?
推荐答案
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;
public class ComboBoxItem extends JFrame implements ActionListener
{
public ComboBoxItem()
{
Vector model = new Vector();
model.addElement( new Item(1, "car" ) );
model.addElement( new Item(2, "plane" ) );
model.addElement( new Item(3, "train" ) );
model.addElement( new Item(4, "boat" ) );
model.addElement( new Item(5, "boat aadf asfsdf a asd asd" ) );
JComboBox comboBox;
// Easiest approach is to just override toString() method
// of the Item class
comboBox = new JComboBox( model );
comboBox.addActionListener( this );
comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
getContentPane().add(comboBox, BorderLayout.NORTH );
// Most flexible approach is to create a custom render
// to diplay the Item data
comboBox = new JComboBox( model );
comboBox.setRenderer( new ItemRenderer() );
comboBox.addActionListener( this );
getContentPane().add(comboBox, BorderLayout.SOUTH );
}
public void actionPerformed(ActionEvent e)
{
JComboBox comboBox = (JComboBox)e.getSource();
Item item = (Item)comboBox.getSelectedItem();
System.out.println( item.getId() + " : " + item.getDescription() );
}
class ItemRenderer extends BasicComboBoxRenderer
{
public Component getListCellRendererComponent(
JList list, Object value, int index,
boolean isSelected, boolean cellHasFocus)
{
super.getListCellRendererComponent(list, value, index,
isSelected, cellHasFocus);
if (value != null)
{
Item item = (Item)value;
setText( item.getDescription().toUpperCase() );
}
if (index == -1)
{
Item item = (Item)value;
setText( "" + item.getId() );
}
return this;
}
}
class Item
{
private int id;
private String description;
public Item(int id, String description)
{
this.id = id;
this.description = description;
}
public int getId()
{
return id;
}
public String getDescription()
{
return description;
}
public String toString()
{
return description;
}
}
public static void main(String[] args)
{
JFrame frame = new ComboBoxItem();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible( true );
}
}
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