如何从右到左设置JTextArea的方向（在JOptionPane内） [英] How to set the orientation of JTextArea from right to left (inside JOptionPane)

问题描述

我有 JScrollPane ，里面有 JTextArea ，我试图从右到左设置JTextArea的方向，所以里面的文字将从右侧开始，滚动条将在左侧

I have JScrollPane with JTextArea inside it and I am trying to set the JTextArea's orientation from right to left so the text inside it will start from the right and the scrollbar will be on the left

我尝试了以下但是它们并没有影响方向的方向：

I've tried the following but they didn't affect the direction of the orientation:

txt.applyComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
txt.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
txt.setAlignmentX(JTextArea.RIGHT_ALIGNMENT);

编辑：

两个答案camickr& trashgod提供的工作正常但不在我的程序中我将JTextArea用作对象消息并将其传递给OptionPane。

the two answers camickr & trashgod provided work fine but not in my program where I use my JTextArea as an object Message and pass it to OptionPane.

EDIT2：

我发现 setComponentOrientation（ComponentOrientation.RIGHT_TO_LEFT）; 如果我将它应用于JOptionPane内容，则不起作用。 。这个问题有另一种解决方案吗？

I figured out that setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); doesn't work if I apply it on the JOptionPane contents .. is there an alternative solution to this issue?

与我的代码类似：

import java.awt.*;
import java.util.*;
import javax.swing.*;
public class TextArea extends JPanel
{
    private JTextArea txt = new JTextArea();
    public TextArea()
    {
        setLayout(new GridLayout());
        txt.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        JScrollPane scroll = new JScrollPane(txt);
        scroll.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        setPreferredSize(new Dimension(200,200));
        this.add(scroll);
    }
    private void display()
    {
        Object[] options = {this};
        JOptionPane pane = new JOptionPane();
        int option = pane.showOptionDialog(null, null, "Title", JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, options, options[0]);
    }
    public static void main(String[] args)
    {
        new TextArea().display();
    }
}

推荐答案

，滚动条将在左侧

and the scrollbar will be on the left

scrollPane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

所以里面的文字将从右边开始

so the text inside it will start from the right

textArea.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

文本从右侧开始，但在您键入时仍然会追加到末尾而不是插入行的开头。

The text starts on the right side, but still gets append to the end as you type instead of being inserted at the beginning of the line.

更新：

我不知道它为什么不在选项窗格中工作。这是一个简单的解决方案：

I don't know why it doesn't work in an option pane. Here is a simple solution:

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

public class Test
{
    public static void main(String args[]) throws Exception
    {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JTextArea textArea = new JTextArea(4, 20);
                JScrollPane scrollPane = new JScrollPane( textArea );
                JPanel panel = new JPanel();
                panel.add( scrollPane );

                scrollPane.addAncestorListener( new AncestorListener()
                {
                    public void ancestorAdded(AncestorEvent e)
                    {
                        JScrollPane scrollPane = (JScrollPane)e.getComponent();
                        scrollPane.applyComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
                    }

                    public void ancestorMoved(AncestorEvent e) {}
                    public void ancestorRemoved(AncestorEvent e) {}
                });

                JOptionPane.showMessageDialog(null, panel);
            }
        });
    }
}

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