java - 输入键以在可编辑的 JComboBox 上表现为 Tab

Question

我有一个 JComboBox 设置为可编辑，我希望用户能够在按下回车键后跳转到下一个控件。我尝试了很多方法，但都没有奏效，其中一个事件被成功触发（EditorCompoment.keyRelease）但是方法“transferFocus（）”并没有像它应该的那样将焦点转移到下一个控件。任何帮助深表感谢。谢谢

public static void addEnterKeyListener(final javax.swing.JComboBox field)
{
    field.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
    field.setFocusTraversalKeysEnabled(false);

    Action myAction = new AbstractAction() {

    @Override
    public void actionPerformed(ActionEvent e) {

        field.transferFocus();
    }

    };

    field.getActionMap().put("enter-action", myAction);

    field.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke("ENTER"), "enter-action");

    field.addKeyListener(new KeyAdapter()
    {
        @Override
        public void keyReleased(final KeyEvent e)
        {
            if (e.getKeyCode() == KeyEvent.VK_ENTER)
            {
                System.out.println("Pressed enter inside JComboBox");
                field.transferFocus();
            }
        }
    });

    field.getEditor().getEditorComponent().addKeyListener(new KeyAdapter()
    {
        @Override
        public void keyReleased(final KeyEvent e)
        {
            System.out.println("Pressed enter inside JComboBox #2");

            if (e.getKeyCode() == KeyEvent.VK_ENTER)
            {                    
                field.transferFocus();
                /*This will fire but will not transfer the focus to the next control*/
                System.out.println("Transfered the focus from JComboBox");
            }
        }
    });

    field.getEditor().addActionListener(new ActionListener() 
    {
        @Override public void actionPerformed(ActionEvent arg0) 
        {
            field.transferFocus();
        }               
    });

    System.out.println("Added enter events to JComboBox");
}

Answer 1

将 ActionListener 应用于组合编辑器的 editorComponent（一个 JTextField）：

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class JComboBoxDemo implements Runnable
{
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new JComboBoxDemo());
  }

  public void run()
  {    
    JComboBox comboBox = new JComboBox(new String[]{"A", "B", "C"});
    comboBox.setEditable(true);

    final JTextField editorComponent = (JTextField) comboBox.getEditor().getEditorComponent();
    editorComponent.addActionListener(new ActionListener()
    {
      @Override
      public void actionPerformed(ActionEvent e)
      {
        editorComponent.transferFocus();
      }
    });

    JPanel panel = new JPanel(new FlowLayout());
    panel.add(new JLabel("Field 1"));
    panel.add(comboBox);
    panel.add(new JLabel("Field 2"));
    panel.add(new JTextField(10));
    panel.add(new JLabel("Field 3"));
    panel.add(new JTextField(10));

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);

    Container c = frame.getContentPane();
    c.setLayout(new BorderLayout());
    c.add(panel, BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);
  }
}