[SOLVED] Java JTextPane changes line height when UTF8 character is added

Java JTextPane changes line height when UTF8 character is added

I am using Java JDK 1.6 and have a problem using JTextPane to show text with a monospaced font. As soon as I add a UTF8-character like 😂, the line height in the textpane is reduced (for all the text already in the pane and also all text added later). How can I avoid this? I would like to have the normal line height.

Here is some sample code:

    class AttributedTextPane extends JTextPane
    {

        private DefaultStyledDocument defaultStyledDocument;

        protected AttributedTextPane()
        {
            this.defaultStyledDocument = new DefaultStyledDocument();
            this.setDocument(defaultStyledDocument);

            this.setContentType("text/plain");
            ...
        }
    }
    ...

This pane is integrated into an JInternalFrame. Creating the panel and setting the desired monospaced font:

    Font font = new Font("DejaVu Sans Mono", Font.PLAIN, 11);
    AttributedTextPane pane = new AttributedTextPane();
    pane.setFont(font);

To display the desired text, I call pane.setText(...); As soon as I add the UTF8 character, the line height changes, see screenshot at https://i.sstatic.net/hBZDe.png. Is there a way to avoid that the line height is changed? Thanks, Deejay

Solution

MutableAttributeSet jTextPaneSet = new SimpleAttributeSet(pane.getParagraphAttributes()); StyleConstants.setLineSpacing(jTextPaneSet, 1.5f); //replace float 1.5f with your desired line spacing/height