Number line and position in the line

Question

Hi, is it possible to know the number of the line and the position of the cariet in a textarea?

Answer 1

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
public class UTextComponent
     **  Return the current column number at the Caret Position.
     public static int getColumnAtCaret(JTextComponent component)
          int caretPosition = component.getCaretPosition();
          Element root = component.getDocument().getDefaultRootElement();
          int line = root.getElementIndex( caretPosition );
          int lineStart = root.getElement( line ).getStartOffset();
          return caretPosition - lineStart + 1;
     **  Return the current line number at the Caret position.
     public static int getLineAtCaret(JTextComponent component)
          int caretPosition = component.getCaretPosition();
          Element root = component.getDocument().getDefaultRootElement();
          return root.getElementIndex( caretPosition ) + 1;
     **  Return the number of lines of text.
     public static int getLines(JTextComponent component)
          Element root = component.getDocument().getDefaultRootElement();
          return root.getElementCount();
     **  Position the caret at the start of a line.
     public static void gotoLine(JTextComponent component, int line)
          Element root = component.getDocument().getDefaultRootElement();
          line = Math.max(line, 1);
          line = Math.min(line, root.getElementCount());
          component.setCaretPosition( root.getElement( line - 1 ).getStartOffset() );
          //  The following will position the caret at the start of the first word
          try
               component.setCaretPosition(javax.swing.text.Utilities.getNextWord(component, component.getCaretPosition()));
          catch(Exception e) {System.out.println(e);}
     **  Return the number of lines of text, including wrapped lines.
     public static int getWrappedLines(JTextPane component)
          int lines = 0;
          View view = component.getUI().getRootView(component).getView(0);
          int paragraphs = view.getViewCount();
          for (int i = 0; i < paragraphs; i++)
               lines += view.getView(i).getViewCount();
          return lines;
     public static void main(String[] args)
          final JTextPane textComponent = new JTextPane();
//          final JTextArea textComponent = new JTextArea(5, 30);
//          textComponent.setLineWrap( true );
          textComponent.addCaretListener( new CaretListener()
               public void caretUpdate(CaretEvent e)
                    System.out.println
                         "Column/Line : " +
                         UTextComponent.getColumnAtCaret( textComponent ) +
                         "/" +
                         UTextComponent.getLineAtCaret( textComponent ) +
                         ", Lines : " +
                         UTextComponent.getLines( textComponent ) +
                         ", Wrapped Lines : " +
                         UTextComponent.getWrappedLines( textComponent )
                    SwingUtilities.invokeLater( new Runnable()
                         public void run()
                              System.out.println( UTextComponent.getWrappedLines( textComponent ) );
          JScrollPane scrollPane = new JScrollPane( textComponent );
          JPanel panel = new JPanel();
          panel.add( new JLabel( "Goto Line:" ) );
          final JTextField gotoField = new JTextField(4);
          panel.add( gotoField );
          gotoField.addActionListener( new java.awt.event.ActionListener()
               public void actionPerformed(java.awt.event.ActionEvent e)
                    UTextComponent.gotoLine(textComponent, Integer.parseInt( gotoField.getText()) );
                    gotoField.setText("");
                    textComponent.requestFocus();
          JFrame frame = new JFrame( "Text Component Utilities" );
          frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
          frame.getContentPane().add( scrollPane );
          frame.getContentPane().add(panel, java.awt.BorderLayout.SOUTH);
          frame.pack();
          frame.setVisible(true);
}