Java 如何从右到左设置 JTextArea 的方向（在 JOptionPane 内）
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原文地址: http://stackoverflow.com/questions/6475320/
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How to set the orientation of JTextArea from right to left (inside JOptionPane)
提问by Eng.Fouad
I have JScrollPanewith JTextAreainside 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JScrollPane跟JTextArea里面，我想设置从右边的JTextArea的方向向左所以它里面的文本会从右边开始，滚动条会出现在左边
I've tried the following but they didn't affect the direction of the orientation:
我已经尝试了以下但它们并没有影响方向的方向：
txt.applyComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
txt.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
txt.setAlignmentX(JTextArea.RIGHT_ALIGNMENT);
EDIT:
编辑：
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.
camickr 和trashgod 提供的两个答案工作正常，但在我使用JTextArea 作为对象Message 并将其传递给OptionPane 的程序中没有。
EDIT2:
编辑2：
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?
我发现setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);如果我将它应用到 JOptionPane 内容上是行不通的……这个问题有替代解决方案吗？
Similar to my code:
类似于我的代码：
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();
}
}
采纳答案by camickr
and the scrollbar will be on the left
滚动条将在左侧
scrollPane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
so the text inside it will start from the right
所以里面的文字会从右边开始
textArea.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
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.
文本从右侧开始，但在您键入时仍会附加到末尾，而不是插入到行首。
Update:
更新：
I don't know why it doesn't work in an option pane. Here is a simple solution:
我不知道为什么它在选项窗格中不起作用。这是一个简单的解决方案：
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);
}
});
}
}
回答by trashgod
This seems to work.
这似乎有效。
import java.awt.ComponentOrientation;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.Locale;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
/** @see http://stackoverflow.com/questions/6475320 */
public class RTLTextArea extends JPanel {
private static final String s = "????? ??????";
private JTextArea jta = new JTextArea(7, 5);
private Locale arabic = new Locale("ar", "KW");
private ComponentOrientation arabicOrientation =
ComponentOrientation.getOrientation(arabic);
public RTLTextArea() {
this.setLayout(new GridLayout());
this.add(new JScrollPane(jta));
this.applyComponentOrientation(arabicOrientation);
for (int i = 0; i < 8; i++) {
jta.append(s + "\n");
}
}
private void display() {
JFrame f = new JFrame("RTLTextAre");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new RTLTextArea().display();
}
});
}
}
回答by jhonnyjuncal
this line
这条线
setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT)
setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT)
change the correct order of the words.
改变单词的正确顺序。
i have this result
我有这个结果
KBytes 80.78
千字节 80.78
回答by Eric D
The following lines solved my problem:
以下几行解决了我的问题：
jTextArea1.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
jTextArea1.setText(<text>);
They serve to:
它们用于：
setComponentOrientation()changes the orientation of theTextArea; and,setText()refreshesTextAreaimmediately so it displays properly
setComponentOrientation()改变 的方向TextArea；和，setText()TextArea立即刷新，以便正确显示
Simply setting ComponentOrientationto RIGHT_TO_LEFTis not sufficient by itself. repaint()doesn't force the text to realign itself. A quick solution for me was to update the contents of the TextArea. That forced the text to realign itself.
仅仅设置ComponentOrientation为RIGHT_TO_LEFT本身是不够的。repaint()不会强制文本重新对齐。对我来说，一个快速的解决方案是更新 TextArea 的内容。这迫使文本重新调整自身。
