带有DefaultComboBoxModel的JComboBox不允许添加或删除

时间:2012-11-21 10:19:54

标签: java swing model autocomplete jcombobox

这是我的第一篇文章,我认为我做得对。

我有一个程序从AutoComplete jComboBox获取用户输入,然后发送要存储到文本文件中的输入。(使用库glazedlists_java15 / 1.8.0完成AutoComplete。)

使用自动填充功能后,我必须将jComboBox设置为DefaultComboBoxModel。

当用户按 Enter键时, jComboBox应使用键盘输入的新项目更新列表,因此用户可以看到最后一个jComboBox列表中的类型项

通过删除jComboBox中的所有项然后重新插入来完成。

问题是之前具有自动完成功能我可以说 jComboBox1.removeAllItems(); 但现在因为模型我必须使用 model.removeAllElements();

public class Test {
    final static DefaultComboBoxModel model = new DefaultComboBoxModel();
    static JComboBox c                = new JComboBox(model);
    private static final long serialVersionUID = 1L;
    private static JButton b = new JButton();
    static JFrame f = new JFrame();
    /**
     * @param args
     */
    public static void TestFrame() {
        String[] a = {"hi1" , "hi2", "hi3", "hi4","hi5"};
        AutoCompleteSupport support = AutoCompleteSupport.install(c,
                GlazedLists.eventListOf(a));
        JPanel test = new JPanel();
        test.add(b);
        test.add(c);
        model.addElement(a);
        b.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                model.removeAllElements();

            }



        });
        f.add(test);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        f.setSize(500,500);

    }

问题是 model.removeAllElements(); model.addElement(s); 无法正常工作,因此我无法更新jComboBox。你能否抽出时间帮助我找到解决方案。谢谢!

2 个答案:

答案 0 :(得分:2)

编辑:

我不知道你的问题出在哪里,这对我来说非常有用

final DefaultComboBoxModel model = new DefaultComboBoxModel();
JComboBox c                = new JComboBox(model);
private static final long serialVersionUID = 1L;
private JButton b = new JButton();

public TestFrame() {
    JPanel test = new JPanel();
    test.add(b);
    test.add(c);
    model.addElement("hi");

    b.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            model.removeAllElements();

        }
    });
    this.add(test);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);
    this.setSize(500,500);

}

也许你没有达到你的keylistener

答案 1 :(得分:0)

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.GlazedLists;
import ca.odell.glazedlists.swing.AutoCompleteSupport;

public class TestFrame
{
    private static JComboBox c = new JComboBox();
    private static JButton b = new JButton();
    private static JFrame f = new JFrame();
    private static String[] a = {"hi1", "hi2", "hi3", "hi4", "hi5"};

    public static void TestFrame()
    {
        final EventList<String> items = GlazedLists.eventListOf(a);
        AutoCompleteSupport.install(c, items);
        JPanel test = new JPanel();
        test.add(b);
        test.add(c);
        c.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                c = (JComboBox) e.getSource();

                if (e.getActionCommand().equals("comboBoxEdited"))
                {
                    items.clear();
                }
            }
        });
        b.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                items.clear();
            }
        });
        f.add(test);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        f.setSize(500, 500);
    }

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                TestFrame();
            }
        });
    }
}