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diff --git a/src/widgets/platforms/mac/qdesktopwidget_mac.mm b/src/widgets/platforms/mac/qdesktopwidget_mac.mm
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/****************************************************************************
+**
+** Copyright (c) 2007-2008, Apple, Inc.
+**
+** All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**
+**   * Redistributions of source code must retain the above copyright notice,
+**     this list of conditions and the following disclaimer.
+**
+**   * Redistributions in binary form must reproduce the above copyright notice,
+**     this list of conditions and the following disclaimer in the documentation
+**     and/or other materials provided with the distribution.
+**
+**   * Neither the name of Apple, Inc. nor the names of its contributors
+**     may be used to endorse or promote products derived from this software
+**     without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+** EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+** PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+** LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+** NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**
+****************************************************************************/
+
+#import <Cocoa/Cocoa.h>
+
+#include "qapplication.h"
+#include "qdesktopwidget.h"
+#include <private/qt_mac_p.h>
+#include "qwidget_p.h"
+#include <private/qt_cocoa_helpers_mac_p.h>
+#include <private/qdesktopwidget_mac_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QT_USE_NAMESPACE
+
+/*****************************************************************************
+  Externals
+ *****************************************************************************/
+
+/*****************************************************************************
+  QDesktopWidget member functions
+ *****************************************************************************/
+
+Q_GLOBAL_STATIC(QDesktopWidgetImplementation, qdesktopWidgetImplementation)
+
+QDesktopWidgetImplementation::QDesktopWidgetImplementation()
+    : appScreen(0)
+{
+    onResize();
+}
+
+QDesktopWidgetImplementation::~QDesktopWidgetImplementation()
+{
+}
+
+QDesktopWidgetImplementation *QDesktopWidgetImplementation::instance()
+{
+    return qdesktopWidgetImplementation();
+}
+
+QRect QDesktopWidgetImplementation::availableRect(int screenIndex) const
+{
+    if (screenIndex < 0 || screenIndex >= screenCount)
+        screenIndex = appScreen;
+
+	return availableRects[screenIndex].toRect(); 
+}
+
+QRect QDesktopWidgetImplementation::screenRect(int screenIndex) const
+{
+    if (screenIndex < 0 || screenIndex >= screenCount)
+        screenIndex = appScreen;
+
+    return screenRects[screenIndex].toRect();
+}
+
+void QDesktopWidgetImplementation::onResize()
+{
+    QMacCocoaAutoReleasePool pool; 
+    NSArray *displays = [NSScreen screens]; 
+    screenCount = [displays count]; 
+ 
+    screenRects.clear(); 
+    availableRects.clear(); 
+    NSRect primaryRect = [[displays objectAtIndex:0] frame]; 
+    for (int i = 0; i<screenCount; i++) {
+        NSRect r = [[displays objectAtIndex:i] frame];
+        int flippedY = - r.origin.y +                  // account for position offset and
+              primaryRect.size.height - r.size.height; // height difference. 
+        screenRects.append(QRectF(r.origin.x, flippedY, 
+            r.size.width, r.size.height)); 
+
+        r = [[displays objectAtIndex:i] visibleFrame];
+        flippedY = - r.origin.y +                      // account for position offset and
+              primaryRect.size.height - r.size.height; // height difference. 
+        availableRects.append(QRectF(r.origin.x, flippedY, 
+                r.size.width, r.size.height)); 
+    }
+}
+
+
+
+QDesktopWidget::QDesktopWidget()
+    : QWidget(0, Qt::Desktop)
+{
+    setObjectName(QLatin1String("desktop"));
+    setAttribute(Qt::WA_WState_Visible);
+}
+
+QDesktopWidget::~QDesktopWidget()
+{
+}
+
+bool QDesktopWidget::isVirtualDesktop() const
+{
+    return true;
+}
+
+int QDesktopWidget::primaryScreen() const
+{
+    return qdesktopWidgetImplementation()->appScreen;
+}
+
+int QDesktopWidget::numScreens() const
+{
+    return qdesktopWidgetImplementation()->screenCount;
+}
+
+QWidget *QDesktopWidget::screen(int)
+{
+    return this;
+}
+
+const QRect QDesktopWidget::availableGeometry(int screen) const
+{
+    return qdesktopWidgetImplementation()->availableRect(screen);
+}
+
+const QRect QDesktopWidget::screenGeometry(int screen) const
+{
+    return qdesktopWidgetImplementation()->screenRect(screen);
+}
+
+int QDesktopWidget::screenNumber(const QWidget *widget) const
+{
+    QDesktopWidgetImplementation *d = qdesktopWidgetImplementation();
+    if (!widget)
+        return d->appScreen;
+    QRect frame = widget->frameGeometry();
+    if (!widget->isWindow())
+        frame.moveTopLeft(widget->mapToGlobal(QPoint(0,0)));
+    int maxSize = -1, maxScreen = -1;
+    for (int i = 0; i < d->screenCount; ++i) {
+        QRect rr = d->screenRect(i);
+        QRect sect = rr.intersected(frame);
+        int size = sect.width() * sect.height();
+        if (size > maxSize && sect.width() > 0 && sect.height() > 0) {
+            maxSize = size;
+            maxScreen = i;
+        }
+    }
+    return maxScreen;
+}
+
+int QDesktopWidget::screenNumber(const QPoint &point) const
+{
+    QDesktopWidgetImplementation *d = qdesktopWidgetImplementation();
+    int closestScreen = -1;
+    int shortestDistance = INT_MAX;
+    for (int i = 0; i < d->screenCount; ++i) {
+        QRect rr = d->screenRect(i);
+        int thisDistance = QWidgetPrivate::pointToRect(point, rr);
+        if (thisDistance < shortestDistance) {
+            shortestDistance = thisDistance;
+            closestScreen = i;
+        }
+    }
+    return closestScreen;
+}
+
+void QDesktopWidget::resizeEvent(QResizeEvent *)
+{
+    QDesktopWidgetImplementation *d = qdesktopWidgetImplementation();
+
+    const int oldScreenCount = d->screenCount;
+    const QVector<QRectF> oldRects(d->screenRects);
+    const QVector<QRectF> oldWorks(d->availableRects);
+
+    d->onResize();
+
+    for (int i = 0; i < qMin(oldScreenCount, d->screenCount); ++i) {
+        if (oldRects.at(i) != d->screenRects.at(i))
+            emit resized(i);
+    }
+    for (int i = 0; i < qMin(oldScreenCount, d->screenCount); ++i) {
+        if (oldWorks.at(i) != d->availableRects.at(i))
+            emit workAreaResized(i);
+    }
+
+    if (oldScreenCount != d->screenCount)
+        emit screenCountChanged(d->screenCount);
+}
+
+QT_END_NAMESPACE