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

**

** Copyright (C) 2009 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_x11_p.h"

#include "qapplication.h"

#include "qx11info_x11.h"

#include "qt_x11_p.h"

#include <private/qeventdispatcher_unix_p.h>

QT_BEGIN_NAMESPACE

class QEventDispatcherX11Private : public QEventDispatcherUNIXPrivate

{

    Q_DECLARE_PUBLIC(QEventDispatcherX11)

public:

    inline QEventDispatcherX11Private()

        : xfd(-1)

    { }

    int xfd;

    QList<XEvent> queuedUserInputEvents;

};

QEventDispatcherX11::QEventDispatcherX11(QObject *parent)

    : QEventDispatcherUNIX(*new QEventDispatcherX11Private, parent)

{ }

QEventDispatcherX11::~QEventDispatcherX11()

{ }

bool QEventDispatcherX11::processEvents(QEventLoop::ProcessEventsFlags flags)

{

    Q_D(QEventDispatcherX11);

    d->interrupt = false;

    QApplication::sendPostedEvents();

    ulong marker = XNextRequest(X11->display);

    int nevents = 0;

    do {

        while (!d->interrupt) {

            XEvent event;

            if (!(flags & QEventLoop::ExcludeUserInputEvents)

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

                // process a pending user input event

                event = d->queuedUserInputEvents.takeFirst();

            } else if (XEventsQueued(X11->display, QueuedAlready)) {

                // process events from the X server

                XNextEvent(X11->display, &event);

                if (flags & QEventLoop::ExcludeUserInputEvents) {

                    // queue user input events

                    switch (event.type) {

                    case ButtonPress:

                    case ButtonRelease:

                    case MotionNotify:

                    case XKeyPress:

                    case XKeyRelease:

                    case EnterNotify:

                    case LeaveNotify:

                        d->queuedUserInputEvents.append(event);

                        continue;

                    case ClientMessage:

                        // only keep the wm_take_focus and

                        // _qt_scrolldone protocols, queue all other

                        // client messages

                        if (event.xclient.format == 32) {

                            if (event.xclient.message_type == ATOM(WM_PROTOCOLS) &&

                                (Atom) event.xclient.data.l[0] == ATOM(WM_TAKE_FOCUS)) {

                                break;

                            } else if (event.xclient.message_type == ATOM(_QT_SCROLL_DONE)) {

                                break;

                            }

                        }

                        d->queuedUserInputEvents.append(event);

                        continue;

                    default:

                        break;

                    }

                }

            } else {

                // no event to process

                break;

            }

            // send through event filter

            if (filterEvent(&event))

                continue;

            nevents++;

            if (qApp->x11ProcessEvent(&event) == 1)

                return true;

            if (event.xany.serial >= marker) {

                if (XEventsQueued(X11->display, QueuedAfterFlush))

                    flags &= ~QEventLoop::WaitForMoreEvents;

                goto out;

            }

        }

    } while (!d->interrupt && XEventsQueued(X11->display, QueuedAfterFlush));

 out:

    if (!d->interrupt) {

        const uint exclude_all =

            QEventLoop::ExcludeSocketNotifiers | QEventLoop::X11ExcludeTimers | QEventLoop::WaitForMoreEvents;

        if (nevents > 0 && ((uint)flags & exclude_all) == exclude_all) {

            QApplication::sendPostedEvents();

            return nevents > 0;

        }

        // return true if we handled events, false otherwise

        return QEventDispatcherUNIX::processEvents(flags) ||  (nevents > 0);

    }

    return nevents > 0;

}

bool QEventDispatcherX11::hasPendingEvents()

{

    extern uint qGlobalPostedEventsCount(); // from qapplication.cpp

    return (qGlobalPostedEventsCount() || XPending(X11->display));

}

void QEventDispatcherX11::flush()

{

    XFlush(X11->display);

}

void QEventDispatcherX11::startingUp()

{

    Q_D(QEventDispatcherX11);

    d->xfd = XConnectionNumber(X11->display);

}

void QEventDispatcherX11::closingDown()

{

    Q_D(QEventDispatcherX11);

    d->xfd = -1;

}

int QEventDispatcherX11::select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,

                                timeval *timeout)

{

    Q_D(QEventDispatcherX11);

    if (d->xfd > 0) {

        nfds = qMax(nfds - 1, d->xfd) + 1;

        FD_SET(d->xfd, readfds);

    }

    return QEventDispatcherUNIX::select(nfds, readfds, writefds, exceptfds, timeout);

}

QT_END_NAMESPACE