package org.kuali.student.common.ui.client.widgets;
   
   import com.google.gwt.event.dom.client.HasKeyUpHandlers;
   import com.google.gwt.event.dom.client.KeyUpEvent;
   import com.google.gwt.event.dom.client.KeyUpHandler;
   import com.google.gwt.user.client.ui.HasText;
   /**
    * TextLinkageHelper is used to link two text fields. As you type in one field the text 
    * appears on the linked field.
   * 
   * */
  public class TextLinkageHelper {
      static String masterString;
      public static void link(final HasText master, final HasText slave) {
          masterString = master.getText();
          if (master instanceof HasKeyUpHandlers) {
                HasKeyUpHandlers masterTextBox = (HasKeyUpHandlers) master;
                masterTextBox.addKeyUpHandler(new KeyUpHandler() {
                  @Override
                  public void onKeyUp(KeyUpEvent event) {
                        if(masterString.equals(slave.getText()) 
                                ||"".equals(slave.getText()) ){
                            masterString = master.getText();
                            slave.setText(masterString);
                        }
                  }
                });
            }
        } 
  }