Make JTextPane adjust height to content

Question

I am trying to get a JTextPane to adjust its height according to any content that I feed it. All I can do is set a fixed height in pixels using Dimension.

How do I make a JTextPane collapse / expand so that it matches the content?

I can add that I use this in GridBagLayout 'ed JPanel , which was added to JScrollPane .

Answer 1

I don’t know a direct way to do this, but it can give you some ideas:

 import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; public class TextPanePerfectSize extends JFrame { JTextField textField; JTextPane textPane; public TextPanePerfectSize() { textField = new JTextField(20); textField.setText("add text"); getContentPane().add(textField, BorderLayout.NORTH ); textField.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { try { Document doc = textPane.getDocument(); doc.insertString(doc.getLength(), " " + textField.getText(), null); textField.setText(""); Dimension d = textPane.getPreferredSize(); Rectangle r = textPane.modelToView( textPane.getDocument().getLength() ); d.height = ry + r.height; textPane.setPreferredSize( d ); getContentPane().validate(); // pack(); } catch(Exception e2) {} } }); JLabel label = new JLabel("Hit Enter to Add Text to Text Pane"); getContentPane().add(label); JPanel south = new JPanel(); textPane = new JTextPane(); textPane.setText("Some text"); textPane.setEditable( false ); textPane.setPreferredSize( new Dimension(120, 23) ); south.add( textPane ); getContentPane().add(south, BorderLayout.SOUTH); } public static void main(String[] args) { JFrame frame = new TextPanePerfectSize(); frame.setSize(200, 200); frame.setLocationRelativeTo( null ); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setVisible(true); } } 

Answer 2

 JTextPane tp = new JTextPane(); setLayout(new BorderLayout()); // set layout on parent add(tp, BorderLayout.CENTER); 

This works for me.