/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

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

**

** This file is part of the QtGui 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 "qeventdispatcher_glib_qws_p.h"

#include "qapplication.h"

#include "qplatformdefs.h"

#include "qapplication.h"

#include "private/qwscommand_qws_p.h"

#include "qwsdisplay_qws.h"

#include "qwsevent_qws.h"

#include "qwindowsystem_qws.h"

#include <glib.h>

QT_BEGIN_NAMESPACE

// from qapplication_qws.cpp

extern QWSDisplay* qt_fbdpy; // QWS `display'

//from qwindowsystem_qws.cpp

extern QList<QWSCommand*> *qt_get_server_queue();

struct GQWSEventSource

{

    GSource source;

    QEventLoop::ProcessEventsFlags flags;

    QWSEventDispatcherGlib *q;

    QWSEventDispatcherGlibPrivate *d;

};

class QWSEventDispatcherGlibPrivate : public QEventDispatcherGlibPrivate

{

    Q_DECLARE_PUBLIC(QWSEventDispatcherGlib)

public:

    QWSEventDispatcherGlibPrivate();

    GQWSEventSource *qwsEventSource;

    QList<QWSEvent*> queuedUserInputEvents;

};

static gboolean qwsEventSourcePrepare(GSource *s, gint *timeout)

{

    if (timeout)

        *timeout = -1;

    GQWSEventSource *source = reinterpret_cast<GQWSEventSource *>(s);

    return qt_fbdpy->eventPending() || !source->d->queuedUserInputEvents.isEmpty()

        || !qt_get_server_queue()->isEmpty() ;

}

static gboolean qwsEventSourceCheck(GSource *s)

{

    GQWSEventSource *source = reinterpret_cast<GQWSEventSource *>(s);

    return qt_fbdpy->eventPending() || !source->d->queuedUserInputEvents.isEmpty()

        || !qt_get_server_queue()->isEmpty() ;

}

static gboolean qwsEventSourceDispatch(GSource *s, GSourceFunc callback, gpointer user_data)

{

    GQWSEventSource *source = reinterpret_cast<GQWSEventSource *>(s);

    //??? ulong marker = XNextRequest(X11->display);

    do {

        QWSEvent *event;

        if (!(source->flags & QEventLoop::ExcludeUserInputEvents)

            && !source->d->queuedUserInputEvents.isEmpty()) {

            // process a pending user input event

            event = source->d->queuedUserInputEvents.takeFirst();

        } else if (qt_fbdpy->eventPending()) {

            event = qt_fbdpy->getEvent();

            if (source->flags & QEventLoop::ExcludeUserInputEvents) {

                // queue user input events

                if (event->type == QWSEvent::Mouse || event->type == QWSEvent::Key) {

                    source->d->queuedUserInputEvents.append(event);

                    continue;

                }

            }

        } else {

            // no event to process

            break;

        }

        // send through event filter

        if (source->q->filterEvent(event)) {

            delete event;

            continue;

        }

        bool ret = qApp->qwsProcessEvent(event) == 1;

        delete event;

        if (ret) {

            return true;

        }

    } while (qt_fbdpy->eventPending());

    if (callback)

        callback(user_data);

    return true;

}

static GSourceFuncs qwsEventSourceFuncs = {

    qwsEventSourcePrepare,

    qwsEventSourceCheck,

    qwsEventSourceDispatch,

    NULL,

    NULL,

    NULL

};

QWSEventDispatcherGlibPrivate::QWSEventDispatcherGlibPrivate()

{

    qwsEventSource = reinterpret_cast<GQWSEventSource *>(g_source_new(&qwsEventSourceFuncs,

                                                                      sizeof(GQWSEventSource)));

    g_source_set_can_recurse(&qwsEventSource->source, true);

    qwsEventSource->flags = QEventLoop::AllEvents;

    qwsEventSource->q = 0;

    qwsEventSource->d = 0;

    g_source_attach(&qwsEventSource->source, mainContext);

}

QWSEventDispatcherGlib::QWSEventDispatcherGlib(QObject *parent)

    : QEventDispatcherGlib(*new QWSEventDispatcherGlibPrivate, parent)

{

}

QWSEventDispatcherGlib::~QWSEventDispatcherGlib()

{

    Q_D(QWSEventDispatcherGlib);

    g_source_destroy(&d->qwsEventSource->source);

    d->qwsEventSource = 0;

}

bool QWSEventDispatcherGlib::processEvents(QEventLoop::ProcessEventsFlags flags)

{

    Q_D(QWSEventDispatcherGlib);

    QEventLoop::ProcessEventsFlags saved_flags = d->qwsEventSource->flags;

    d->qwsEventSource->flags = flags;

    bool returnValue = QEventDispatcherGlib::processEvents(flags);

    d->qwsEventSource->flags = saved_flags;

    return returnValue;

}

void QWSEventDispatcherGlib::startingUp()

{

     Q_D(QWSEventDispatcherGlib);

     d->qwsEventSource->q = this;

     d->qwsEventSource->d = d;

}

QT_END_NAMESPACE