How to select/highlight an entire row in JTextArea

[Valeriano]

In my JTextArea, the text consists of lines of text. When I click on a particular point in the JTextArea and if there is a line of text across
that point, I want that line of text is selected and high-lighted. How
to do this?

[karma]

Hi Valeriano,

Please try the following code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
 
public class TextAreaSelectLine extends JFrame implements MouseListener
{
	JTextArea textArea;
	Action selectLine;
 
	public TextAreaSelectLine()
	{
 
		textArea = new JTextArea( "one two\nthree four", 10, 30 );
		textArea.addMouseListener( this );
 
		JScrollPane scrollPane = new JScrollPane( textArea );
		getContentPane().add( scrollPane, BorderLayout.SOUTH );
		getContentPane().add( new JTextArea() );
 
		selectLine = getAction(DefaultEditorKit.selectLineAction);
 
	}
 
	private Action getAction(String name)
	{
		Action action = null;
		Action[] actions = textArea.getActions();
 
		for (int i = 0; i < actions.length; i++)
		{
			if (name.equals( actions[i].getValue(Action.NAME).toString() ) )
			{
				action = actions[i];
				break;
			}
		}
 
		return action;
	}
 
	public void mouseClicked(MouseEvent e)
	{
 
		if ( SwingUtilities.isLeftMouseButton(e)  && e.getClickCount() == 1)
		{
			selectLine.actionPerformed( null );
 
 
 
		}
	}
 
	public void mousePressed(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
 
	public static void main(String[] args)
	{
		TextAreaSelectLine frame = new TextAreaSelectLine();
		frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
		frame.pack();
		frame.setVisible(true);
	}
}

[Valeriano]

Thanks Karma, it worked perfectly