JTextPane line wrapping

Question

Unlike JTextArea, JTextPane has no option to turn line wrapping off. I found one solution to turning off line wrapping in JTextPanes,

Answer 1

See No Wrap Text Pane. Here's the code included from the link.

JTextPane textPane = new JTextPane();
JPanel noWrapPanel = new JPanel( new BorderLayout() );
noWrapPanel.add( textPane );
JScrollPane scrollPane = new JScrollPane( noWrapPanel );

Answer 2

The No Wrap Text Pane also provides an alternative solution that doesn't require wrapping the JTextPane in a JPanel, instead it overrides getScrollableTracksViewportWidth(). I prefer that solution, but it didn't quite work for me - I noticed that wrapping still occurs if the viewport becomes narrower than the minimum width of the JTextPane.

I found that JEditorPane is overriding getPreferredSize() to try and 'fix' things when the viewport is too narrow by returning the minimum width instead of the preferred width. This can be resolved by overriding getPreferredSize() again to say 'no, really - we always want the actual preferred size':

public class NoWrapJTextPane extends JTextPane {
    @Override
    public boolean getScrollableTracksViewportWidth() {
        // Only track viewport width when the viewport is wider than the preferred width
        return getUI().getPreferredSize(this).width 
            <= getParent().getSize().width;
    };

    @Override
    public Dimension getPreferredSize() {
        // Avoid substituting the minimum width for the preferred width when the viewport is too narrow
        return getUI().getPreferredSize(this);
    };
}