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#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