FocusTracker.java

/*
 * FocusTracker.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.core.client.widget;

import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.HasAllFocusHandlers;

public class FocusTracker
{
   public FocusTracker(final HasAllFocusHandlers widget)
   {
      isFocused_ = false;
      
      widget.addFocusHandler(new FocusHandler()
      {
         @Override
         public void onFocus(FocusEvent event)
         {
            isFocused_ = true;
         }
      });
      
      widget.addBlurHandler(new BlurHandler()
      {
         @Override
         public void onBlur(BlurEvent event)
         {
            isFocused_ = false;
         }
      });
   }
   
   public boolean isFocused()
   {
      return isFocused_;
   }
   
   private boolean isFocused_;
}