突出显示JTextArea

Question

我有一个问题:

        int index = text.indexOf(myWord);

        while (index >= 0) {
            int len = pattern.length();
            hl.addHighlight(index, index + len, DefaultHighlighter.DefaultPainter);
            index = text.indexOf(pattern, index + len);
        }

当我到达行尾突出显示仍然启用时,如何禁用突出显示？上面代码的结果:

谢谢你的回答,但问题是:

黑线是我点击并开始输入的地方,这只是错误.

Answer 1

好吧,我不得不对你的变量名做一些假设,我希望我做得对.基本上你的代码对我有用,但我不理解第一行:

int index = text.indexOf(myWord);

我认为它应该是:

int index = text.indexOf(pattern);

无论如何,我写了这段代码,它对我有用:

String pattern = "<aa>";
String text = textArea.getText();        
int index = text.indexOf(pattern);
while(index >= 0){
    try {                
        hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter);
        index = text.indexOf(pattern, index + pattern.length());            
    } catch (BadLocationException ex) {
        ex.printStackTrace();
    }
}

更新

当你点击标记文本的结尾并开始输入时,看起来也会被标记 - 这是我的错误.

对不起我之前没有看到.我认为你不能停止荧光笔,但你可以使用它CaretListener并在那里做东西.这样,如果您输入与您的模式匹配的新字符串,它也会突出显示:

textArea.addCaretListener(new CaretListener() {            
    @Override
    public void caretUpdate(CaretEvent e) {
        if(e.getMark() == e.getDot()){
            Highlighter hl = textArea.getHighlighter();
            hl.removeAllHighlights();

            String pattern = "<aa>";
            String text = textArea.getText();        
            int index = text.indexOf(pattern);
            while(index >= 0){
                try {                
                    Object o = hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter);
                    index = text.indexOf(pattern, index + pattern.length());
                } catch (BadLocationException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
});

注意e.getMark() == e.getDot()表示基于CaretEvent.getDot()和CaretEvent.getMark() javadoc的"没有文本选择" .否则,您不应突出显示除选定文本之外的任

截图

更新了SSCCE

这是一个完整的SSCCE来测试它:

import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter;

public class Demo {

    private void initGUI(){

        final JTextArea textArea = new JTextArea();

        textArea.addCaretListener(new CaretListener() {            
            @Override
            public void caretUpdate(CaretEvent e) {
                if(e.getMark() == e.getDot()){
                    Highlighter hl = textArea.getHighlighter();
                    hl.removeAllHighlights();

                    String pattern = "<aa>";
                    String text = textArea.getText();        
                    int index = text.indexOf(pattern);
                    while(index >= 0){
                        try {                
                            Object o = hl.addHighlight(index, index + pattern.length(), DefaultHighlighter.DefaultPainter);
                            index = text.indexOf(pattern, index + pattern.length());
                        } catch (BadLocationException ex) {
                            ex.printStackTrace();
                        }
                    }
                }
            }
        });

        JScrollPane scrollPane = new JScrollPane(textArea);
        scrollPane.setPreferredSize(new Dimension(300,200));

        JPanel content = new JPanel(new FlowLayout());
        content.add(scrollPane);

        JFrame frame = new JFrame("Demo");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setContentPane(content);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);        
    }


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

}