圍繞Java中的不可編輯文本編輯可編輯的JTextArea

Question

我正在使用Swing進行命令提示。我正在使用可編輯的JTextArea作爲輸入，但我不想在輸入可編輯之前將其區域化（C:\Windows\system32>）。

我知道這一點的唯一方法可以做到這一點是這樣的：Make parts of a JTextArea non editable (not the whole JTextArea!)

是否有其他方法嗎？

Answer 1

剛開始的時候

然後，你可以這樣做：

import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.text.*; 

public class NavigationFilterPrefixWithBackspace extends NavigationFilter 
{ 
    private int prefixLength; 
    private Action deletePrevious; 

    public NavigationFilterPrefixWithBackspace(int prefixLength, JTextComponent component) 
    { 
     this.prefixLength = prefixLength; 
     deletePrevious = component.getActionMap().get("delete-previous"); 
     component.getActionMap().put("delete-previous", new BackspaceAction()); 
     component.setCaretPosition(prefixLength); 
    } 

    public void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) 
    { 
     fb.setDot(Math.max(dot, prefixLength), bias); 
    } 

    public void moveDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) 
    { 
     fb.moveDot(Math.max(dot, prefixLength), bias); 
    } 

    class BackspaceAction extends AbstractAction 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      JTextComponent component = (JTextComponent)e.getSource(); 

      if (component.getCaretPosition() > prefixLength) 
      { 
       deletePrevious.actionPerformed(null); 
      } 
     } 
    } 

    public static void main(String args[]) throws Exception { 

     JTextField textField = new JTextField("Prefix_", 20); 
     textField.setNavigationFilter(new NavigationFilterPrefixWithBackspace(7, textField)); 

     JFrame frame = new JFrame("Navigation Filter Example"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.getContentPane().add(textField); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 
}