/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#ifndef nsAutoCopyListener_h_
#define nsAutoCopyListener_h_

#include "nsISelectionListener.h"
#include "nsISelectionPrivate.h"

class nsAutoCopyListener : public nsISelectionListener
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSISELECTIONLISTENER

  void Listen(nsISelectionPrivate *aSelection)
  {
      NS_ASSERTION(aSelection, "Null selection passed to Listen()");
      aSelection->AddSelectionListener(this);
  }

  static nsAutoCopyListener* GetInstance()
  {
    if (!sInstance) {
      sInstance = new nsAutoCopyListener();
      if (!sInstance)
        return nsnull;

      NS_ADDREF(sInstance);
    }

    return sInstance;
  }

  static void Shutdown()
  {
    NS_IF_RELEASE(sInstance);
  }

private:
  static nsAutoCopyListener* sInstance;
};

#endif
