TabInputableTextArea.java

package com.akjava.gwt.lib.client.widget;

import com.google.gwt.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.user.client.ui.TextArea;

public class TabInputableTextArea extends TextArea{

	public TabInputableTextArea(){
		super();
		this.addKeyDownHandler(DEFAULT_TEXTAREA_TAB_HANDLER);
	}
	
	public static final KeyDownHandler DEFAULT_TEXTAREA_TAB_HANDLER = new KeyDownHandler() {
	    @Override
	    public final void onKeyDown(KeyDownEvent event) {
	      if (event.getNativeKeyCode() == 9) {
	        event.preventDefault();
	        event.stopPropagation();//really need this?
	        final TextArea ta = (TextArea) event.getSource();
	        final int index = ta.getCursorPos();
	        final String text = ta.getText();
	        ta.setText(text.substring(0, index) 
	                   + "\t" + text.substring(index));
	        ta.setCursorPos(index + 1);
	      }
	    }
	  };
}