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

#include "qguieventdispatcher_glib_p.h"

#include "qapplication.h"

#include "qx11info_x11.h"

#include "qt_x11_p.h"

#include <glib.h>

QT_BEGIN_NAMESPACE

struct GX11EventSource

{

    GSource source;

    GPollFD pollfd;

    QEventLoop::ProcessEventsFlags flags;

    QGuiEventDispatcherGlib *q;

    QGuiEventDispatcherGlibPrivate *d;

};

class QGuiEventDispatcherGlibPrivate : public QEventDispatcherGlibPrivate

{

    Q_DECLARE_PUBLIC(QGuiEventDispatcherGlib)

public:

    QGuiEventDispatcherGlibPrivate();

    GX11EventSource *x11EventSource;

    QList<XEvent> queuedUserInputEvents;

};

static gboolean x11EventSourcePrepare(GSource *s, gint *timeout)

{

    if (timeout)

        *timeout = -1;

    GX11EventSource *source = reinterpret_cast<GX11EventSource *>(s);

    return (XEventsQueued(X11->display, QueuedAfterFlush)

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

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

}

static gboolean x11EventSourceCheck(GSource *s)

{

    GX11EventSource *source = reinterpret_cast<GX11EventSource *>(s);

    return (XEventsQueued(X11->display, QueuedAfterFlush)

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

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

}

static gboolean x11EventSourceDispatch(GSource *s, GSourceFunc callback, gpointer user_data)

{

    GX11EventSource *source = reinterpret_cast<GX11EventSource *>(s);

    ulong marker = XNextRequest(X11->display);

    do {

        XEvent event;

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

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

            // process a pending user input event

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

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

            // process events from the X server

            XNextEvent(X11->display, &event);

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

                // queue user input events

                switch (event.type) {

                case ButtonPress:

                case ButtonRelease:

                case MotionNotify:

                case XKeyPress:

                case XKeyRelease:

                case EnterNotify:

                case LeaveNotify:

                    source->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;

                        }

                    }

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

                    continue;

                default:

                    break;

                }

            }

        } else {

            // no event to process

            break;

        }

        // send through event filter

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

            continue;

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

            return true;

        if (event.xany.serial >= marker)

            goto out;

    } while (XEventsQueued(X11->display, QueuedAfterFlush));

 out:

    source->d->runTimersOnceWithNormalPriority();

    if (callback)

        callback(user_data);

    return true;

}

static GSourceFuncs x11EventSourceFuncs = {

    x11EventSourcePrepare,

    x11EventSourceCheck,

    x11EventSourceDispatch,

    NULL,

    NULL,

    NULL

};

QGuiEventDispatcherGlibPrivate::QGuiEventDispatcherGlibPrivate()

{

    x11EventSource = reinterpret_cast<GX11EventSource *>(g_source_new(&x11EventSourceFuncs,

                                                                      sizeof(GX11EventSource)));

    g_source_set_can_recurse(&x11EventSource->source, true);

    memset(&x11EventSource->pollfd, 0, sizeof(GPollFD));

    x11EventSource->flags = QEventLoop::AllEvents;

    x11EventSource->q = 0;

    x11EventSource->d = 0;

    g_source_attach(&x11EventSource->source, mainContext);

}

QGuiEventDispatcherGlib::QGuiEventDispatcherGlib(QObject *parent)

    : QEventDispatcherGlib(*new QGuiEventDispatcherGlibPrivate, parent)

{

}

QGuiEventDispatcherGlib::~QGuiEventDispatcherGlib()

{

    Q_D(QGuiEventDispatcherGlib);

    g_source_remove_poll(&d->x11EventSource->source, &d->x11EventSource->pollfd);

    g_source_destroy(&d->x11EventSource->source);

    d->x11EventSource = 0;

}

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

{

    Q_D(QGuiEventDispatcherGlib);

    QEventLoop::ProcessEventsFlags saved_flags = d->x11EventSource->flags;

    d->x11EventSource->flags = flags;

    bool returnValue = QEventDispatcherGlib::processEvents(flags);

    d->x11EventSource->flags = saved_flags;

    return returnValue;

}

void QGuiEventDispatcherGlib::startingUp()

{

    Q_D(QGuiEventDispatcherGlib);

    d->x11EventSource->pollfd.fd = XConnectionNumber(X11->display);

    d->x11EventSource->pollfd.events = G_IO_IN | G_IO_HUP | G_IO_ERR;

    d->x11EventSource->q = this;

    d->x11EventSource->d = d;

    g_source_add_poll(&d->x11EventSource->source, &d->x11EventSource->pollfd);

}

QT_END_NAMESPACE