Java 以方式设置 JTextField 宽度以包装给定的文本

set a JTextField width in maner to wrap a given text

提问by RiadSaadi

I have an uneditable and disabled JtextFieldin which I will put a Stringobtained after requesting a Database, and I want that this JtextFieldwraps All my String.

我有一个不可编辑和禁用JtextField的，我将String在请求数据库后放置一个获取的，我希望它JtextField包含我所有的字符串。

I saw the setColumn()and setSize()methods but I don't know first my Stringlength.

我看到了setColumn()和setSize()方法，但我首先不知道我的String长度。

thank you very much.

非常感谢您。

采纳答案by Hovercraft Full Of Eels

• JTextFields can only display a single line of text, period.
• If you need a simple text component that wraps text, use a JTextArea.
• Set its columns and rows.
• Put it into a JScrollPane (if you feel the text will go beyond the number of rows specified).
• Call setLineWrap(true)on it
• Call setWrapStyleWord(true)on it.

• JTextFields 只能显示一行文本，句点。
• 如果您需要一个用于包装文本的简单文本组件，请使用 JTextArea。
• 设置其列和行。
• 将其放入 JScrollPane（如果您觉得文本会超出指定的行数）。
• 呼唤setLineWrap(true)它
• 打电话setWrapStyleWord(true)给它。

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Edit
You ask about resizing the JTextField as text is being added or removed. I suppose that you could always override a JTextField's getPreferredSize()method, and revalidate/repaint its container on any change in text, but doing so does carry risk.

编辑
您询问在添加或删除文本时调整 JTextField 的大小。我想您总是可以覆盖 JTextField 的getPreferredSize()方法，并在文本发生任何更改时重新验证/重新绘制其容器，但这样做确实存在风险。

For example:

例如：

import java.awt.*;
import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class VaryingTextFieldSize {
   protected static final int GAP = 5;

   public static void main(String[] args) {
      final JTextField textField = new JTextField(1) {
         @Override
         public Dimension getPreferredSize() {
            Dimension superPref = super.getPreferredSize();
            FontMetrics fontMetrics = getFontMetrics(getFont());
            String text = getText();
            if (text.length() > 0) {
               int width = fontMetrics.charsWidth(text.toCharArray(), 0, text.length()) + GAP;
               return new Dimension(width, superPref.height);
            }
            return superPref;
         }
      };
      textField.getDocument().addDocumentListener(new DocumentListener() {
         @Override
         public void removeUpdate(DocumentEvent e) {
            reSize();
         }

         @Override
         public void insertUpdate(DocumentEvent e) {
            reSize();
         }

         @Override
         public void changedUpdate(DocumentEvent e) {
            reSize();
         }

         private void reSize() {
            SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                  Container container = textField.getParent();
                  container.revalidate();
                  container.repaint();
               }
            });
         }
      });
      JPanel enclosingPanel = new JPanel();
      enclosingPanel.setPreferredSize(new Dimension(300, 100));
      enclosingPanel.add(textField);
      JOptionPane.showMessageDialog(null, enclosingPanel);
   }
}