JScrollPane滚动条跳转到JEditorPane.setText()

Question

每次(除了第一次)我在JEditorPane滚动条中设置文本跳转到JEditorPane的底部.有什么方法可以避免这种情况吗？我试过的一种方法是在setText()之后使用setCaretPosition(0).它有效,但它不是我需要的.滚动条跳下然后跳起来.有没有办法避免在settext()中滚动条的任何移动？

我的代码:

package test;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JScrollPane;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

public class Test extends JApplet implements  HyperlinkListener {

    JEditorPane dataDisplayer = new JEditorPane();

    public void init() {
        ataDisplayer.setEditable(false);
        dataDisplayer.add(new JButton());
        dataDisplayer.setContentType("text/html");   
        JScrollPane jsp = new JScrollPane(dataDisplayer);
        dataDisplayer.setText("<a href=''>Change Text</a><br><br><br><br><br><br><br><br><br><br>bla");
        this.dataDisplayer.addHyperlinkListener(this);
        setContentPane(jsp);
    }

    @Override
    public void hyperlinkUpdate(HyperlinkEvent arg0) {
        dataDisplayer.setText("<a href=''>Change Text</a><br><br><br><br><br><br><br><br><br><br>bla bla");

    }

}

Answer 1

有不同的方法可以解决这个问题.一个是简单地避免插入符号可见性调整,如下所示:

import java.awt.Rectangle;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.DefaultCaret;

public class TestEditorPane implements HyperlinkListener {

    private final class MyCaret extends DefaultCaret {

        @Override
        protected void adjustVisibility(Rectangle nloc) {

        }

    }

    JEditorPane dataDisplayer = new JEditorPane();
    private MyCaret caret;

    @Override
    public void hyperlinkUpdate(HyperlinkEvent arg0) {
        dataDisplayer.setText("<a href=''>Change Text</a><br><br><br><br><br><br><br><br><br><br>bla bla");

    }

    public void init() {
        JFrame frame = new JFrame();
        dataDisplayer.setEditable(false);
        caret = new MyCaret();
        dataDisplayer.setCaret(caret);
        dataDisplayer.add(new JButton());
        dataDisplayer.setContentType("text/html");
        JScrollPane jsp = new JScrollPane(dataDisplayer);
        dataDisplayer.setText("<a href=''>Change Text</a><br><br><br><br><br><br><br><br><br><br>bla");
        this.dataDisplayer.addHyperlinkListener(this);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(jsp);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TestEditorPane().init();
            }
        });
    }
}