/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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 GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include "qwineventnotifier_p.h"#include "qeventdispatcher_win_p.h"#include "qcoreapplication.h"#include <private/qthread_p.h>/*    \class QWinEventNotifier qwineventnotifier.h    \brief The QWinEventNotifier class provides support for the Windows Wait functions.    \ingroup io    The QWinEventNotifier class makes it possible to use the wait    functions on windows in a asynchronous manner. With this class    you can register a HANDLE to an event and get notification when    that event becomes signalled. The state of the event is not modified    in the process so if it is a manual reset event you will need to    reset it after the notification.*/QWinEventNotifier::QWinEventNotifier(QObject *parent)  : QObject(parent), handleToEvent(0), enabled(false){}QWinEventNotifier::QWinEventNotifier(HANDLE hEvent, QObject *parent) : QObject(parent), handleToEvent(hEvent), enabled(false){    Q_D(QObject);    QEventDispatcherWin32 *eventDispatcher = qobject_cast<QEventDispatcherWin32 *>(d->threadData->eventDispatcher);    Q_ASSERT_X(eventDispatcher, "QWinEventNotifier::QWinEventNotifier()",               "Cannot create a win event notifier without a QEventDispatcherWin32");    eventDispatcher->registerEventNotifier(this);    enabled = true;}QWinEventNotifier::~QWinEventNotifier(){    setEnabled(false);}void QWinEventNotifier::setHandle(HANDLE hEvent){    setEnabled(false);    handleToEvent = hEvent;}HANDLE  QWinEventNotifier::handle() const{    return handleToEvent;}bool QWinEventNotifier::isEnabled() const{    return enabled;}void QWinEventNotifier::setEnabled(bool enable){    if (enabled == enable)                        // no change        return;    enabled = enable;    Q_D(QObject);    QEventDispatcherWin32 *eventDispatcher = qobject_cast<QEventDispatcherWin32 *>(d->threadData->eventDispatcher);    if (!eventDispatcher) // perhaps application is shutting down        return;    if (enabled)        eventDispatcher->registerEventNotifier(this);    else        eventDispatcher->unregisterEventNotifier(this);}bool QWinEventNotifier::event(QEvent * e){    if (e->type() == QEvent::ThreadChange) {        if (enabled) {            QMetaObject::invokeMethod(this, "setEnabled", Qt::QueuedConnection,                                      Q_ARG(bool, enabled));            setEnabled(false);        }    }    QObject::event(e);                        // will activate filters    if (e->type() == QEvent::WinEventAct) {        emit activated(handleToEvent);        return true;    }    return false;}