JTextPane text background color does not work

Question

I am trying to make a small HTML-wysiwyg with a `JTextPane` but I can't get the `BackgroundAction` to work. I am using `setCharacterAttributes` on the `StyledDocument` of the `JTextPane` but it seems problematic. The view is ok but the `Document` is not. Here is a small demo code showing the problem. There are 2 `JTextPane`: - I set the background color of my text in the first one - I retrieve the text of the first `JTextPane` and set it on the second one --> They don't show the same thing although they have the same text. Is there a way to set the background color on the current selected text and have the `JTextPane` report an updated HTML-text? ``` import java.awt.Color; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextPane; import javax.swing.SwingUtilities; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.StyleConstants; import javax.swing.text.StyledDocument; public…

Accepted Answer

Here is the code for an Action that can set the background color:

```
public class BackgroundColorAction extends StyledEditorKit.StyledTextAction {

private Color color;

public BackgroundColorAction(Color color) {
        super(StyleConstants.Background.toString());
        this.color = color;
    }

@Override
    public void actionPerformed(ActionEvent ae) {
        JEditorPane editor = getEditor(ae);
        if (editor == null) {
            return;
        }
        //Add span Tag
        String htmlStyle = "background-color:" + Util.getHTMLColor(color);
        SimpleAttributeSet attr = new SimpleAttributeSet();
        attr.addAttribute(HTML.Attribute.STYLE, htmlStyle);
        MutableAttributeSet outerAttr = new SimpleAttributeSet();
        outerAttr.addAttribute(HTML.Tag.SPAN, attr);
        //Next line is just an instruction to editor to change color
        StyleConstants.setBackground(outerAttr, this.color);
        setCharacterAttributes(editor, outerAttr, false);
    }
}
```

I had lot of trouble setting background color. But finally, I have managed to crack it.` Sorry I forgot to post the subroutine. Here you go:

```
/**  
 * Convert a Java Color to equivalent HTML Color.
 *
 * @param color The Java Color
 * @return The String containing HTML Color.
 */
public static String getHTMLColor(Color color) {
    if (color == null) {
        return "#000000";
    }
    return "#" + Integer.toHexString(color.getRGB()).substring(2).toUpperCase();
}
```

JTextPane text background color does not work

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