JTextArea 中特定文本的 ActionListener? [英] ActionListener for a specific text inside a JTextArea?

问题描述

我的应用程序中有一个聊天组件，上面有一个 JTextArea.现在，如何为特定文本(如 student://xxxx)添加类似 ActionListener 的事件?

I have in my app a chat component which has a JTextArea on it. Now, how can I add an ActionListener-like event for a specific text (like student://xxxx)?

因此，当我单击该文本 (student://xxxx) 时，会发生一些事情.谢谢.

So when I click on that text (student://xxxx) something will happen. Thank you.

推荐答案

这里试试这个小程序，试试在student://开头点击，会弹出一个消息Dialog

Here try this small program, try to click at the start of student://, that will pop up a message Dialog

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

public class TextAreaExample extends JFrame
{
    private JTextArea tarea =  new JTextArea(10, 10);
    private JTextField tfield = new JTextField(10);

    private void createAndDisplayGUI()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        tarea.setText("Hello there
");
        tarea.append("Hello student://");
        JScrollPane scroll = new JScrollPane(tarea);

        tfield.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                tarea.append(tfield.getText() + "
");
            }
        });

        tarea.addMouseListener(new MouseAdapter()
        {
            public void mouseClicked(MouseEvent me)
            {
                int x = me.getX();
                int y = me.getY();
                System.out.println("X : " + x);
                System.out.println("Y : " + y);
                int startOffset = tarea.viewToModel(new Point(x, y));
                System.out.println("Start Offset : " + startOffset);
                String text = tarea.getText();
                int searchLocation = text.indexOf("student://", startOffset);
                System.out.println("Search Location : " + searchLocation);
                if (searchLocation == startOffset)
                    JOptionPane.showMessageDialog(TextAreaExample.this, "BINGO you found me.");
            }
        });

        getContentPane().add(scroll, BorderLayout.CENTER);
        getContentPane().add(tfield, BorderLayout.PAGE_END);
        pack();
        setLocationByPlatform(true);
        setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new TextAreaExample().createAndDisplayGUI();
            }
        });
    }
}

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