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Diffstat (limited to 'src/corelib/kernel/qwineventnotifier_p.cpp')
-rw-r--r-- | src/corelib/kernel/qwineventnotifier_p.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/corelib/kernel/qwineventnotifier_p.cpp b/src/corelib/kernel/qwineventnotifier_p.cpp new file mode 100644 index 0000000000..afdc26502e --- /dev/null +++ b/src/corelib/kernel/qwineventnotifier_p.cpp @@ -0,0 +1,134 @@ +/**************************************************************************** +** +** 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 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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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. + + 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 |