/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * 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.org 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):
 *   Lars Knoll <knoll@kde.org>
 *   Zack Rusin <zack@kde.org>
 *   John C. Griggs <johng@corel.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nscore.h"  // needed for 'nsnull'
#include "nsToolkit.h"
#include "nsGUIEvent.h"
#include "plevent.h"
#include "nsWidgetAtoms.h"

// Static thread local storage index of the Toolkit
// object associated with a given thread...
static PRUintn gToolkitTLSIndex = 0;

//-------------------------------------------------------------------------
// constructor
//-------------------------------------------------------------------------
nsToolkit::nsToolkit()
{
}

//-------------------------------------------------------------------------
// destructor
//-------------------------------------------------------------------------
nsToolkit::~nsToolkit()
{
  // Remove the TLS reference to the toolkit...
  PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
}

//-------------------------------------------------------------------------
// nsISupports implementation macro
//-------------------------------------------------------------------------
NS_IMPL_ISUPPORTS1(nsToolkit, nsIToolkit)

//-------------------------------------------------------------------------
NS_IMETHODIMP nsToolkit::Init(PRThread *aThread)
{
  nsWidgetAtoms::RegisterAtoms();

  return NS_OK;
}

//-------------------------------------------------------------------------
// Return the nsIToolkit for the current thread.  If a toolkit does not
// yet exist, then one will be created...
//-------------------------------------------------------------------------
NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
{
  nsIToolkit* toolkit = nsnull;
  nsresult rv = NS_OK;
  PRStatus status;

  // Create the TLS index the first time through...
  if (0 == gToolkitTLSIndex) {
    status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
    if (PR_FAILURE == status) {
      rv = NS_ERROR_FAILURE;
    }
  }
  if (NS_SUCCEEDED(rv)) {
    toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);

    // Create a new toolkit for this thread...
    if (!toolkit) {
      toolkit = new nsToolkit();

      if (!toolkit) {
        rv = NS_ERROR_OUT_OF_MEMORY;
      }
      else {
        NS_ADDREF(toolkit);
        toolkit->Init(PR_GetCurrentThread());

        // The reference stored in the TLS is weak.  It is removed in the
        // nsToolkit destructor...
        PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
       }
    }
    else {
      NS_ADDREF(toolkit);
    }
    *aResult = toolkit;
  }
  return rv;
}