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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwineventnotifier_p.h"
#include "qeventdispatcher_win_p.h"
#include "qcoreapplication.h"
#include <private/qthread_p.h>
QT_BEGIN_NAMESPACE
/*
\class QWinEventNotifier
\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;
}
QT_END_NAMESPACE
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