设置JTextField的宽度来包装给定的文本

问题描述

我有一个不可编辑且已禁用的JtextField，其中将放置请求数据库之后获得的String，并且我希望该JtextField包装所有我的字符串.

I have an uneditable and disabled JtextField in which I will put a String obtained after requesting a Database, and I want that this JtextField wraps All my String.

我看到了setColumn()和setSize()方法，但是我首先不知道我的String长度.

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

非常感谢.

推荐答案

• JTextFields只能显示一行文本，即句点.
• 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(如果您认为文本超出了指定的行数).
• 在其上致电setLineWrap(true)
• 在其上致电setWrapStyleWord(true).
• 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.

修改
您询问有关在添加或删除文本时调整JTextField大小的问题.我想您总是可以重写JTextField的getPreferredSize()方法，并根据文本的任何更改重新验证/重绘其容器，但是这样做确实会带来风险.

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.

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);
   }
}

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