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  1. 01-10-2012, 10:33 PM #1
    pbrockway2
    pbrockway2 is offline Moderator
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    Default JEditorPane text disappears

    I'm seeing something odd after I have set the character attributes in a styled document obtained from a JEditorPane: the string returned by getText() is missing some content.

    Java Code: 
    import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.Style;
import javax.swing.text.html.HTMLDocument;

public class GetTextStrangeness extends JPanel {
    
    private static final String EXAMPLE_TEXT = "<html><head><style>"
        + "  a{text-decoration:none;color:black;}" 
        + "  a:hover{color:blue;text-decoration:underline;}"
        + "</style></head>"
        + "<body>"
        + "  <p><a href='#foo'>Text for link foo</a>"
        + "  <br/><a href='#bar'>Text for link bar</p>"
        + "</body></html>";
    
    private JEditorPane ep;
    
    public GetTextStrangeness() {
        setLayout(new BorderLayout());
        
        ep = new JEditorPane();
        ep.setContentType("text/html");
        ep.setEditable(false);
        ep.addHyperlinkListener(hoverListener);
        add(ep, BorderLayout.CENTER);
        
        JButton but = new JButton("Click me!");
        but.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                System.out.println(ep.getText());
            }
        });
        add(but, BorderLayout.SOUTH);
        
        ep.setText(EXAMPLE_TEXT);
        System.out.println(ep.getText());
    }
    
    private HyperlinkListener hoverListener = new HyperlinkListener() {
        @Override
        public void hyperlinkUpdate(HyperlinkEvent he) {
            HyperlinkEvent.EventType type = he.getEventType();
            String styleName = null;  
            if(type == HyperlinkEvent.EventType.ENTERED) {  
                styleName = "a:hover";  
            } else if(type == HyperlinkEvent.EventType.EXITED) {  
                styleName = "a";  
            }  
            if(styleName != null) { 
                HTMLDocument doc = (HTMLDocument)ep.getDocument();  
                Style newStyle = doc.getStyleSheet().getStyle(styleName);
                int start = he.getSourceElement().getStartOffset();  
                int end = he.getSourceElement().getEndOffset();  
                doc.setCharacterAttributes(start, end - start, newStyle, false);
            }  
        }
    };
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame("Test");
                frame.add(new GetTextStrangeness());
                frame.setSize(400, 300);
                frame.setLocationRelativeTo(null);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}
    When I run that code I get the following output:

    Java Code: 
    <html>
  <head>
    <style type="text/css">
      <!--
        a { color: black; text-decoration: none }
        a:hover { color: blue; text-decoration: underline }
      -->
    </style>
    
  </head>
  <body>
    <p>
      <a href="#foo">Text for link foo</a><br><a href="#bar">Text for link bar</a>
    </p>
  </body>
</html>
    This is what I expect. When I move the mouse over the two lines of text I get the "hover" effect I want over the links. But after I have hovered over the links, clicking the button results in the following:

    Java Code: 
    <html>
  <head>
    <style type="text/css">
      <!--
        a { color: black; text-decoration: none }
        a:hover { color: blue; text-decoration: underline }
      -->
    </style>
    
  </head>
  <body>
    <p>
      <font color="black"><a href="#foo"><a>
      </a></font><br>
      <font color="black"><a href="#bar"><a>
</a></font>    </p>
  </body>
</html>
    The text content of the links has gone! (It's still visible in the JEditorPane, and still hovers as I intend.)

    This is not causing me a problem because the pages are "static" and I can easily remember their text at the time I setText() on the editor pane. But I'm wondering if anybody knows what's going on. Partly to satisfy my curiosity and partly in case I am doing something wrong in the hypertext link listener that might come back to bite me later.
  2. 01-11-2012, 02:42 AM #2
    doWhile
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    Default Re: JEditorPane text disappears

    For what its worth, the HTMLWriter class reproduces the result you report (with JRE 6):
    Java Code: 
    StringWriter sw = new StringWriter();
HTMLWriter writer = new HTMLWriter(sw, (HTMLDocument)ep.getDocument());
writer.write();
    ...and it is my understanding (but don't quote me :) ) that this what getText() calls (indirectly). Perhaps check out the source to see what is going on under the hood:

    javax.swing.text.html: HTMLWriter.java
    Last edited by doWhile; 01-11-2012 at 02:44 AM.
  3. 01-13-2012, 02:39 AM #3
    pbrockway2
    pbrockway2 is offline Moderator
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    Default Re: JEditorPane text disappears

    Sorry I didn't get back earlier to acknowledge your post, doWhile. I followed your link into the code (and lost a couple of hours of my life!) But I'm basically none the wiser. I think fundamentally I don't really understand how the whole model/view thing is implemented wrt html and JEditorPane in any detail.

    It's no big problem though. My app does what I want, and I'm not so naive as to expect to make a silk purse out of a JEditorPane.
  4. 01-13-2012, 06:17 PM #4
    doWhile
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    Default Re: JEditorPane text disappears

    Quote Originally Posted by pbrockway2 View Post
    Sorry I didn't get back earlier to acknowledge your post, doWhile. I followed your link into the code (and lost a couple of hours of my life!) But I'm basically none the wiser. I think fundamentally I don't really understand how the whole model/view thing is implemented wrt html and JEditorPane in any detail.

    It's no big problem though. My app does what I want, and I'm not so naive as to expect to make a silk purse out of a JEditorPane.
    No Worries. I sometimes get lost when diving into the java source as well...I was hoping the code in that link would let you play around with what getText returns - for instance you could override getText method to use the HTMLWriter class directly (as opposed to indirectly) and have it return the text you expect it to return. Not a big deal though as it seems you've figured a work around.
  5. 05-26-2012, 11:09 AM #5
    DarrylBurke's Avatar
    DarrylBurke
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    Default Re: JEditorPane text disappears

    Removed spam, closing thread.

    db
    Why do they call it rush hour when nothing moves? - Robin Williams
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