SPACES anstelle von TABs in JTextArea

[inflamer]

Hallo!

wie der Titel schon sagt - wie kriegt man es hin, dass in einer JTextArea beim Betätigen der Tabulatortaste statt eines TAB-Zeichens eine einstellbare Anzahl von Leerzeichen eingefügt werden?

Danke für Eure Hilfe!

 

[clemson]

du musst dir einen KeyListenerschreiben...

package org.javaforum.y06.june.jtextarea;

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JTextArea;

/**
 * @version $Revision: $, $Date: $
 */
public class TabTextArea extends JFrame implements KeyListener
{

	/**
	 * string, which shall be inserted, when TABULATOR was pressed
	 */
	private static final String TABULATOR_STRING = "    ";

	/**
	 * JTextArea, to demonstrate the TABULATOR
	 */
	private JTextArea area;

	/**
	 * Create new TABULATOR demonstrate
	 * @param args
	 */
	public static void main(String[] args)
	{
		new TabTextArea();
	}

	/**
	 * Initialise and show the frame
	 */
	public TabTextArea()
	{
		super("JTextAreaTest");

		initComponents();

		initFrame();
	}

	/**
	 * Init the components of frame
	 */
	private void initComponents()
	{
		/*
		 * create new textarea and register keylistener
		 */
		this.area = new JTextArea("TabTextArea", 10, 5);
		this.area.addKeyListener(this);

		// add texteare to frame
		add(this.area);
	}

	/**
	 * initialises the frame
	 */
	private void initFrame()
	{
		pack();
		validate();

		setVisible(true);
	}

	/**
	 * (non-Javadoc)
	 * @see java.awt.event.KeyListener#keyPressed(java.awt.event.KeyEvent)
	 */
	public void keyPressed(KeyEvent e)
	{
		/**
		 * interrupt / consume the event, when the TABULATOR is pressed and
		 * insert the replacement string instead
		 */
		if (e.getKeyCode() == KeyEvent.VK_TAB)
		{
			e.consume();
			int caretPosition = this.area.getCaretPosition();
			this.area.insert(TABULATOR_STRING, caretPosition);
		}
	}

	/**
	 * (non-Javadoc)
	 * @see java.awt.event.KeyListener#keyReleased(java.awt.event.KeyEvent)
	 */
	@SuppressWarnings("unused")
	public void keyReleased(KeyEvent e)
	{
		// empty
	}

	/**
	 * (non-Javadoc)
	 * @see java.awt.event.KeyListener#keyTyped(java.awt.event.KeyEvent)
	 */
	@SuppressWarnings("unused")
	public void keyTyped(KeyEvent e)
	{
		// empty
	}

}

edit: code ausgebessert

 

[inflamer]

Ok, besten Dank!