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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

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     7 ** This file is part of the Qt Mobility Components.

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    13 ** contained in the Technology Preview License Agreement accompanying

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <directshoweventloop.h>

    43 

    44 #include <QtCore/qcoreapplication.h>

    45 #include <QtCore/qcoreevent.h>

    46 

    47 class DirectShowPostedEvent

    48 {

    49 public:

    50     DirectShowPostedEvent(QObject *receiver, QEvent *event)

    51         : receiver(receiver)

    52         , event(event)

    53         , next(0)

    54     {

    55     }

    56 

    57     ~DirectShowPostedEvent()

    58     {

    59         delete event;

    60     }

    61 

    62     QObject *receiver;

    63     QEvent *event;

    64     DirectShowPostedEvent *next;

    65 };

    66 

    67 DirectShowEventLoop::DirectShowEventLoop(QObject *parent)

    68     : QWinEventNotifier(parent)

    69     , m_postsHead(0)

    70     , m_postsTail(0)

    71     , m_eventHandle(::CreateEvent(0, 0, 0, 0))

    72     , m_waitHandle(::CreateEvent(0, 0, 0, 0))

    73 {

    74     setHandle(m_eventHandle);

    75     setEnabled(true);

    76 }

    77 

    78 DirectShowEventLoop::~DirectShowEventLoop()

    79 {

    80     setEnabled(false);

    81 

    82     ::CloseHandle(m_eventHandle);

    83     ::CloseHandle(m_waitHandle);

    84 

    85     for (DirectShowPostedEvent *post = m_postsHead; post; post = m_postsHead) {

    86         m_postsHead = m_postsHead->next;

    87 

    88         delete post;

    89     }

    90 }

    91 

    92 void DirectShowEventLoop::wait(QMutex *mutex)

    93 {

    94     ::ResetEvent(m_waitHandle);

    95 

    96     mutex->unlock();

    97 

    98     HANDLE handles[] = { m_eventHandle, m_waitHandle };

    99     while (::WaitForMultipleObjects(2, handles, false, INFINITE) == WAIT_OBJECT_0)

   100         processEvents();

   101   

   102     mutex->lock();

   103 }

   104 

   105 void DirectShowEventLoop::wake()

   106 {

   107     ::SetEvent(m_waitHandle);

   108 }

   109 

   110 void DirectShowEventLoop::postEvent(QObject *receiver, QEvent *event)

   111 {

   112     QMutexLocker locker(&m_mutex);

   113 

   114     DirectShowPostedEvent *post = new DirectShowPostedEvent(receiver, event);

   115 

   116     if (m_postsTail)

   117         m_postsTail->next = post;

   118     else

   119         m_postsHead = post;

   120 

   121     m_postsTail = post;

   122 

   123     ::SetEvent(m_eventHandle);

   124 }

   125 

   126 bool DirectShowEventLoop::event(QEvent *event)

   127 {

   128     if (event->type() == QEvent::WinEventAct) {

   129         processEvents();

   130 

   131         return true;

   132     } else {

   133         return QWinEventNotifier::event(event);

   134     }

   135 }

   136 

   137 void DirectShowEventLoop::processEvents()

   138 {

   139     QMutexLocker locker(&m_mutex);

   140 

   141     while(m_postsHead) {

   142         ::ResetEvent(m_eventHandle);

   143 

   144         DirectShowPostedEvent *post = m_postsHead;

   145         m_postsHead = m_postsHead->next;

   146 

   147         locker.unlock();

   148         QCoreApplication::sendEvent(post->receiver, post->event);

   149         delete post;

   150         locker.relock();

   151     }

   152 

   153     m_postsTail = 0;

   154 }