fdac892bbc
Docs still need some fixing, but there are some legitimate usages of it there. Change-Id: I94c7b68788ce97829711a4384884d7e52fe84162 Reviewed-on: http://codereview.qt.nokia.com/1736 Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>
151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <directshoweventloop.h>
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#include <QtCore/qcoreapplication.h>
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#include <QtCore/qcoreevent.h>
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class DirectShowPostedEvent
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{
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public:
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DirectShowPostedEvent(QObject *receiver, QEvent *event)
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: receiver(receiver)
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, event(event)
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, next(0)
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{
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}
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~DirectShowPostedEvent()
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{
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delete event;
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}
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QObject *receiver;
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QEvent *event;
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DirectShowPostedEvent *next;
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};
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DirectShowEventLoop::DirectShowEventLoop(QObject *parent)
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: QObject(parent)
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, m_postsHead(0)
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, m_postsTail(0)
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, m_eventHandle(::CreateEvent(0, 0, 0, 0))
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, m_waitHandle(::CreateEvent(0, 0, 0, 0))
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{
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}
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DirectShowEventLoop::~DirectShowEventLoop()
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{
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::CloseHandle(m_eventHandle);
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::CloseHandle(m_waitHandle);
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for (DirectShowPostedEvent *post = m_postsHead; post; post = m_postsHead) {
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m_postsHead = m_postsHead->next;
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delete post;
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}
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}
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void DirectShowEventLoop::wait(QMutex *mutex)
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{
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::ResetEvent(m_waitHandle);
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mutex->unlock();
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HANDLE handles[] = { m_eventHandle, m_waitHandle };
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while (::WaitForMultipleObjects(2, handles, false, INFINITE) == WAIT_OBJECT_0)
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processEvents();
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mutex->lock();
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}
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void DirectShowEventLoop::wake()
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{
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::SetEvent(m_waitHandle);
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}
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void DirectShowEventLoop::postEvent(QObject *receiver, QEvent *event)
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{
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QMutexLocker locker(&m_mutex);
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DirectShowPostedEvent *post = new DirectShowPostedEvent(receiver, event);
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if (m_postsTail)
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m_postsTail->next = post;
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else
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m_postsHead = post;
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m_postsTail = post;
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QCoreApplication::postEvent(this, new QEvent(QEvent::User));
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::SetEvent(m_eventHandle);
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}
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void DirectShowEventLoop::customEvent(QEvent *event)
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{
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if (event->type() == QEvent::User) {
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processEvents();
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} else {
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QObject::customEvent(event);
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}
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}
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void DirectShowEventLoop::processEvents()
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{
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QMutexLocker locker(&m_mutex);
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::ResetEvent(m_eventHandle);
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while(m_postsHead) {
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DirectShowPostedEvent *post = m_postsHead;
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m_postsHead = m_postsHead->next;
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if (!m_postsHead)
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m_postsTail = 0;
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locker.unlock();
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QCoreApplication::sendEvent(post->receiver, post->event);
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delete post;
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locker.relock();
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}
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}
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