Java Swing JTextArea 左右书写 [英] Java Swing JTextArea write both left and right

问题描述

我正在使用 Java 制作一个简单的消息传递应用程序.我想在 textArea 的左侧和右侧显示消息，如所有 whatsapp、messenger 等.更改方向会更改所有文本方向，因此它没有用.

I am making a simple messaging app with Java . I want to display messages both left and right side of my textArea like all whatsapp, messenger etc. Changing orientation changes all texts orientation so its not useful.

非常感谢

推荐答案

您不能使用 JTextArea.

You can't use a JTextArea.

一种解决方案是使用 JTextPane 并为您插入的每一行文本设置属性:

One solution is to use a JTextPane and set the attributes for each line of text you insert:

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

public class TextPaneChat
{
    private static void createAndShowGUI()
    {
        JTextPane textPane = new JTextPane();

        StyledDocument doc = textPane.getStyledDocument();

        SimpleAttributeSet left = new SimpleAttributeSet();
        StyleConstants.setAlignment(left, StyleConstants.ALIGN_LEFT);
        StyleConstants.setForeground(left, Color.RED);

        SimpleAttributeSet right = new SimpleAttributeSet();
        StyleConstants.setAlignment(right, StyleConstants.ALIGN_RIGHT);
        StyleConstants.setForeground(right, Color.BLUE);

        try
        {
            doc.insertString(doc.getLength(), "Are you busy tonight?", left );
            doc.setParagraphAttributes(doc.getLength(), 1, left, false);
            doc.insertString(doc.getLength(), "\nNo", right );
            doc.setParagraphAttributes(doc.getLength(), 1, right, false);
            doc.insertString(doc.getLength(), "\nFeel like going to a movie?", left );
            doc.setParagraphAttributes(doc.getLength(), 1, left, false);
            doc.insertString(doc.getLength(), "\nSure", right );
            doc.setParagraphAttributes(doc.getLength(), 1, right, false);
        }
        catch(Exception e) { System.out.println(e); }

        JFrame frame = new JFrame("Text Pane Chat");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new JScrollPane( textPane ) );
        frame.setLocationByPlatform( true );
        frame.setSize(200, 200);
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

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