您可以链接两个JFormattedTextFields的值吗? [英] Can you link values for two JFormattedTextFields?

问题描述

我有一个带有2个JFormattedTextFields的接口，我需要它们的值(不仅仅是显示的文本)是相同的.理想情况下，它们都应该是可编辑的，并且其中一个的变化反映在另一个中.

I've got an interface with 2 JFormattedTextFields for which I need the values (not just the displayed text) to be identical. Ideally they should both be editable, with a change in one being mirrored in the other.

我首先只是在两个文档之间共享一个文档，但是很快遇到了一个问题，即它仅链接显示的文本，而不链接基础值. (对不起，我！)
我没有尝试为值"属性添加互惠的PropertyChangeListeners，因为我希望这会建立一个无限的修改循环.

I started by just sharing a single Document between the two, but quickly ran into the problem that this only links the displayed text, not the underlying value. (Silly me!)
I haven't tried adding reciprocal PropertyChangeListeners for the "value" property because I would expect that to set up an infinite loop of modification.

我错过了什么吗?有什么办法可以做到这一点?还是我只允许用户编辑两者之一，而只让值沿一个方向传播?

Am I missing something? Is there some way to do this? Or am I stuck with only allowing users to edit one of the two and only having the value propagate in one direction?

谢谢！

推荐答案

我需要相同的值(而不仅仅是显示的文本). 理想情况下，它们都应该是可编辑的，并且其中一个要更改 相互映照.

I need the values (not just the displayed text) to be identical. Ideally they should both be editable, with a change in one being mirrored in the other.

• 使用 DocumentListener ，

  (仅一个方向)

  import java.awt.GridLayout;
  import javax.swing.*;
  import javax.swing.event.DocumentEvent;
  import javax.swing.event.DocumentListener;
  
  public class TextLabelMirror {
  
      private JPanel mainPanel = new JPanel();
      private JTextField field = new JTextField(20);
      private JTextField field1 = new JTextField(20);
  
      public TextLabelMirror() {
          field.getDocument().addDocumentListener(new DocumentListener() {
  
              @Override
              public void changedUpdate(DocumentEvent e) {
                  updateLabel(e);
              }
  
              @Override
              public void insertUpdate(DocumentEvent e) {
                  updateLabel(e);
              }
  
              @Override
              public void removeUpdate(DocumentEvent e) {
                  updateLabel(e);
              }
  
              private void updateLabel(DocumentEvent e) {
                  java.awt.EventQueue.invokeLater(new Runnable() {
  
                      @Override
                      public void run() {
                          field1.setText(field.getText());
                      }
                  });
              }
          });
  
          mainPanel.setLayout(new GridLayout(1, 0, 10, 0));
          mainPanel.add(field);
          mainPanel.add(field1);
      }
  
      public JComponent getComponent() {
          return mainPanel;
      }
  
      private static void createAndShowUI() {
          JFrame frame = new JFrame("TextLabelMirror");
          frame.getContentPane().add(new TextLabelMirror().getComponent());
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.pack();
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
      }
  
      public static void main(String[] args) {
          java.awt.EventQueue.invokeLater(new Runnable() {
  
              @Override
              public void run() {
                  createAndShowUI();
              }
          });
      }
  }
  

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