src/corelib/kernel/qobject.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qobject.h"
#include "qobject_p.h"

#include "qabstracteventdispatcher.h"
#include "qcoreapplication.h"
#include "qcoreapplication_p.h"
#include "qvariant.h"
#include "qmetaobject.h"
#include <qregexp.h>
#include <qthread.h>
#include <private/qthread_p.h>
#include <qdebug.h>
#include <qhash.h>
#include <qpair.h>
#include <qvarlengtharray.h>
#include <qset.h>

#include <new>

#include <ctype.h>
#include <limits.h>

static int DIRECT_CONNECTION_ONLY = 0;

Q_GLOBAL_STATIC(QReadWriteLock, qt_object_read_write_lock)
QReadWriteLock *QObjectPrivate::readWriteLock() { return qt_object_read_write_lock(); }

static int *queuedConnectionTypes(const QList<QByteArray> &typeNames)
{
    int *types = static_cast<int *>(qMalloc((typeNames.count() + 1) * sizeof(int)));
    for (int i = 0; i < typeNames.count(); ++i) {
        const QByteArray typeName = typeNames.at(i);
        if (typeName.endsWith('*'))
            types[i] = QMetaType::VoidStar;
        else
            types[i] = QMetaType::type(typeName);

        if (!types[i]) {
            qWarning("QObject::connect: Cannot queue arguments of type '%s'\n"
                     "(Make sure '%s' is registed using qRegisterMetaType().)",
                     typeName.constData(), typeName.constData());
            qFree(types);
            return 0;
        }
    }
    types[typeNames.count()] = 0;

    return types;
}

struct QConnection {
    QObject *sender;
    int signal;
    QObject *receiver;
    int method;
    uint refCount:30;
    uint type:2; // 0 == auto, 1 == direct, 2 == queued
    int *types;
};
Q_DECLARE_TYPEINFO(QConnection, Q_MOVABLE_TYPE);

class QConnectionList
{
public:
    QReadWriteLock lock;

    typedef QMultiHash<const QObject *, int> Hash;
    Hash sendersHash, receiversHash;
    QList<int> unusedConnections;
    typedef QList<QConnection> List;
    List connections;

    void remove(QObject *object);

    void addConnection(QObject *sender, int signal,
                       QObject *receiver, int method,
                       int type = 0, int *types = 0);
    bool removeConnection(QObject *sender, int signal,
                          QObject *receiver, int method);
};

Q_GLOBAL_STATIC(QConnectionList, connectionList)


void QConnectionList::remove(QObject *object)
{
    for (int i = 0; i < 2; ++i) {
        Hash &hash1 = i == 0 ? sendersHash : receiversHash;
        Hash &hash2 = i == 0 ? receiversHash : sendersHash;

        Hash::iterator it = hash1.find(object);
        const Hash::iterator end = hash1.end();
        while (it != end && it.key() == object) {
            const int at = it.value();
            QConnection &c = connections[at];
            if (c.sender) {
                if (c.types && c.types != &DIRECT_CONNECTION_ONLY) {
                    qFree(c.types);
                    c.types = 0;
                }
                it = hash1.erase(it);

                const QObject * const partner = i == 0 ? c.receiver : c.sender;
                Hash::iterator x = hash2.find(partner);
                const Hash::iterator xend = hash2.end();
                while (x != xend && x.key() == partner) {
                    if (x.value() == at) {
                        x = hash2.erase(x);
                        break;
                    } else {
                        ++x;
                    }
                }

                uint refCount = c.refCount;
                memset(&c, 0, sizeof(c));
                c.refCount = refCount;
                Q_ASSERT(!unusedConnections.contains(at));
                unusedConnections.prepend(at);
            } else {
                ++it;
            }
        }
    }
}

void QConnectionList::addConnection(QObject *sender, int signal,
                                    QObject *receiver, int method,
                                    int type, int *types)
{
    QConnection c = { sender, signal, receiver, method, 0, 0, types };
    c.type = type; // don't warn on VC++6
    int at = -1;
    for (int i = 0; i < unusedConnections.size(); ++i) {
        if (!connections.at(unusedConnections.at(i)).refCount) {
            // reuse an unused connection
            at = unusedConnections.takeAt(i);
            connections[at] = c;
            break;
        }
    }
    if (at == -1) {
        // append new connection
        at = connections.size();
        connections << c;
    }
    sendersHash.insert(sender, at);
    receiversHash.insert(receiver, at);
}

bool QConnectionList::removeConnection(QObject *sender, int signal,
                                       QObject *receiver, int method)
{
    bool success = false;
    Hash::iterator it = sendersHash.find(sender);
    while (it != sendersHash.end() && it.key() == sender) {
        const int at = it.value();
        QConnection &c = connections[at];
        if (c.receiver
            && (signal < 0 || signal == c.signal)
            && (receiver == 0
                || (c.receiver == receiver && (method < 0 || method == c.method)))) {
            if (c.types) {
                if (c.types != &DIRECT_CONNECTION_ONLY)
                    qFree(c.types);
                c.types = 0;
            }
            it = sendersHash.erase(it);

            Hash::iterator x = receiversHash.find(c.receiver);
            const Hash::iterator xend = receiversHash.end();
            while (x != xend && x.key() == c.receiver) {
                if (x.value() == at) {
                    x = receiversHash.erase(x);
                    break;
                } else {
                    ++x;
                }
            }

            uint refCount = c.refCount;
            memset(&c, 0, sizeof(c));
            c.refCount = refCount;
            unusedConnections << at;
            success = true;
        } else {
            ++it;
        }
    }
    return success;
}

/*
  QObjectSet sets the minimum capacity to 4099 (the first prime number
  after 4096), so that we can speed up QObject destruction.
 */
class QObjectSet : public QSet<QObject *>
{
public:
    QObjectSet()
    { reserve(4099); }
};

Q_GLOBAL_STATIC(QObjectSet, allObjects)

extern "C" Q_CORE_EXPORT void qt_addObject(QObject *object)
{
    QWriteLocker locker(QObjectPrivate::readWriteLock());
    QObjectSet *set = allObjects();
    if (set)
        set->insert(object);
}

extern "C" Q_CORE_EXPORT void qt_removeObject(QObject *object)
{
    QObjectSet *set = allObjects();
    if (set)
        set->remove(object);
}

#ifdef Q_CC_MSVC
#pragma warning(push)
#pragma warning(disable:4190)
#endif

extern "C" Q_CORE_EXPORT QList<QObject *> qt_allTopLevelWidgets()
{
    QList<QObject *> list;

    QReadLocker locker(QObjectPrivate::readWriteLock());
    const QObjectSet *set = allObjects();
    if (!set)
        return list;

    for (QSet<QObject *>::const_iterator it = set->constBegin(); it != set->constEnd(); ++it) {
        if ((*it)->isWidgetType() && !(*it)->parent())
            list << *it;
    }

    return list;
}

#ifdef Q_CC_MSVC
#pragma warning(pop)
#endif

bool QObjectPrivate::isValidObject(QObject *object)
{
    QObjectSet *set = allObjects();
    return set ? set->contains(object) : false;
}

QObjectPrivate::QObjectPrivate(int version)
    : threadData(0), currentSender(0), currentSenderSignalIdStart(-1), currentSenderSignalIdEnd(-1)
{
    if (version != QObjectPrivateVersion)
        qFatal("Cannot mix incompatible Qt libraries");

    // QObjectData initialization
    q_ptr = 0;
    parent = 0;                                 // no parent yet. It is set by setParent()
    isWidget = false;                           // assume not a widget object
    pendTimer = false;                          // no timers yet
    blockSig = false;                           // not blocking signals
    wasDeleted = false;                         // double-delete catcher
    sendChildEvents = true;                     // if we should send ChildInsert and ChildRemove events to parent
    receiveChildEvents = true;
    postedEvents = 0;
#ifdef QT3_SUPPORT
    postedChildInsertedEvents = 0;
#endif
    extraData = 0;
}

QObjectPrivate::~QObjectPrivate()
{
#ifndef QT_NO_USERDATA
    if (extraData)
        qDeleteAll(extraData->userData);
    delete extraData;
#endif
}

bool QObjectPrivate::isSender(const QObject *receiver, const char *signal) const
{
    Q_Q(const QObject);
    int signal_index = q->metaObject()->indexOfSignal(signal);
    if (signal_index < 0)
        return false;
    QConnectionList *list = ::connectionList();
    QReadLocker locker(&list->lock);
    QConnectionList::Hash::const_iterator it = list->sendersHash.constFind(q);
    while (it != list->sendersHash.constEnd() && it.key() == q) {
        const QConnection &c = list->connections.at(it.value());
        if (c.signal == signal_index && c.receiver == receiver)
            return true;
        ++it;
    }
    return false;
}

QObjectList QObjectPrivate::receiverList(const char *signal) const
{
    Q_Q(const QObject);
    QObjectList receivers;
    int signal_index = q->metaObject()->indexOfSignal(signal);
    if (signal_index < 0)
        return receivers;
    QConnectionList *list = ::connectionList();
    QReadLocker locker(&list->lock);
    QConnectionList::Hash::const_iterator it = list->sendersHash.constFind(q);
    while (it != list->sendersHash.constEnd() && it.key() == q) {
        const QConnection &c = list->connections.at(it.value());
        if (c.signal == signal_index)
            receivers << c.receiver;
        ++it;
    }
    return receivers;
}

QObjectList QObjectPrivate::senderList() const
{
    Q_Q(const QObject);
    QObjectList senders;
    QConnectionList *list = ::connectionList();
    QReadLocker locker(&list->lock);
    QConnectionList::Hash::const_iterator it = list->receiversHash.constFind(q);
    while (it != list->receiversHash.constEnd() && it.key() == q) {
        const QConnection &c = list->connections.at(it.value());
        senders << c.sender;
        ++it;
    }
    return senders;
}

typedef QMultiHash<QObject *, QObject **> GuardHash;
Q_GLOBAL_STATIC(GuardHash, guardHash)
Q_GLOBAL_STATIC(QReadWriteLock, guardHashLock)

void QMetaObject::addGuard(QObject **ptr)
{
    if (!*ptr)
        return;
    GuardHash *hash = guardHash();
    if (!hash) {
        *ptr = 0;
        return;
    }
    QWriteLocker locker(guardHashLock());
    hash->insert(*ptr, ptr);
}

void QMetaObject::removeGuard(QObject **ptr)
{
    if (!*ptr)
        return;
    GuardHash *hash = guardHash();
    if (!hash)
        return;
    QWriteLocker locker(guardHashLock());
    GuardHash::iterator it = hash->find(*ptr);
    const GuardHash::iterator end = hash->end();
    for (; it.key() == *ptr && it != end; ++it) {
        if (it.value() == ptr) {
            (void) hash->erase(it);
            break;
        }
    }
}

void QMetaObject::changeGuard(QObject **ptr, QObject *o)
{
    GuardHash *hash = guardHash();
    if (!hash) {
        *ptr = 0;
        return;
    }
    QWriteLocker locker(guardHashLock());
    if (*ptr) {
        GuardHash::iterator it = hash->find(*ptr);
        const GuardHash::iterator end = hash->end();
        for (; it.key() == *ptr && it != end; ++it) {
            if (it.value() == ptr) {
                (void) hash->erase(it);
                break;
            }
        }
    }
    *ptr = o;
    if (*ptr)
        hash->insert(*ptr, ptr);
}

void QObjectPrivate::clearGuards(QObject *object)
{
    GuardHash *hash = ::guardHash();
    if (hash) {
        QWriteLocker locker(guardHashLock());
        GuardHash::iterator it = hash->find(object);
        const GuardHash::iterator end = hash->end();
        while (it.key() == object && it != end) {
            *it.value() = 0;
            it = hash->erase(it);
        }
    }
}

QMetaCallEvent::QMetaCallEvent(int id, const QObject *sender,
                               int nargs, int *types, void **args)
    :QEvent(MetaCall), id_(id), sender_(sender), idFrom_(-1), idTo_(-1),
     nargs_(nargs), types_(types), args_(args)
{ }

QMetaCallEvent::QMetaCallEvent(int id, const QObject *sender, int idFrom, int idTo,
                               int nargs, int *types, void **args)
    : QEvent(MetaCall), id_(id), sender_(sender), idFrom_(idFrom), idTo_(idTo),
      nargs_(nargs), types_(types), args_(args)
{ }

QMetaCallEvent::~QMetaCallEvent()
{
    for (int i = 0; i < nargs_; ++i) {
        if (types_[i] && args_[i])
            QMetaType::destroy(types_[i], args_[i]);
    }
    if (types_) qFree(types_);
    if (args_) qFree(args_);
}

void *qt_find_obj_child(QObject *parent, const char *type, const QString &name)
{
    QObjectList list = parent->children();
    if (list.size() == 0) return 0;
    for (int i = 0; i < list.size(); ++i) {
        QObject *obj = list.at(i);
        if (name == obj->objectName() && obj->inherits(type))
            return obj;
    }
    return 0;
}


/*****************************************************************************
  QObject member functions
 *****************************************************************************/

QObject::QObject(QObject *parent)
    : d_ptr(new QObjectPrivate)
{
    Q_D(QObject);
    ::qt_addObject(d_ptr->q_ptr = this);
    d->threadData = QThreadData::current();
    d->threadData->ref();
    if (parent && parent->d_func()->threadData != d->threadData) {
        qWarning("QObject: Cannot create children for a parent that is in a different thread.");
        parent = 0;
    }
    setParent(parent);
}

#ifdef QT3_SUPPORT

QObject::QObject(QObject *parent, const char *name)
    : d_ptr(new QObjectPrivate)
{
    Q_D(QObject);
    ::qt_addObject(d_ptr->q_ptr = this);
    d->threadData = QThreadData::current();
    d->threadData->ref();
    if (parent && parent->d_func()->threadData != d->threadData) {
        qWarning("QObject: Cannot create children for a parent that is in a different thread.");
        parent = 0;
    }
    setParent(parent);
    setObjectName(QString::fromAscii(name));
}
#endif

QObject::QObject(QObjectPrivate &dd, QObject *parent)
    : d_ptr(&dd)
{
    Q_D(QObject);
    ::qt_addObject(d_ptr->q_ptr = this);
    d->threadData = QThreadData::current();
    d->threadData->ref();
    if (parent && parent->d_func()->threadData != d->threadData) {
        qWarning("QObject: Cannot create children for a parent that is in a different thread.");
        parent = 0;
    }
    if (d->isWidget) {
        if (parent) {
            d->parent = parent;
            d->parent->d_func()->children.append(this);
        }
        // no events sent here, this is done at the end of the QWidget constructor
    } else {
        setParent(parent);
    }
}

QObject::~QObject()
{
    Q_D(QObject);
    if (d->wasDeleted) {
#if defined(QT_DEBUG)
        qWarning("QObject: Double deletion detected");
#endif
        return;
    }
    d->wasDeleted = true;

    d->blockSig = 0; // unblock signals so we always emit destroyed()

    if (!d->isWidget) {
        // set all QPointers for this object to zero - note that
        // ~QWidget() does this for us, so we don't have to do it twice
        QObjectPrivate::clearGuards(this);
     }

    emit destroyed(this);

    QConnectionList *list = ::connectionList();
    if (list) {
        QWriteLocker locker(&list->lock);
        list->remove(this);
    }

    if (d->pendTimer) {
        // unregister pending timers
        if (d->threadData->eventDispatcher)
            d->threadData->eventDispatcher->unregisterTimers(this);
    }

    d->eventFilters.clear();

    if (!d->children.isEmpty())
        d->deleteChildren();

    {
        QWriteLocker locker(QObjectPrivate::readWriteLock());
        ::qt_removeObject(this);

        /*
          theoretically, we cannot check d->postedEvents without
          holding the postEventList.mutex for the object's thread,
          but since we hold the QObjectPrivate::readWriteLock(),
          nothing can go into QCoreApplication::postEvent(), which
          effectively means no one can post new events, which is what
          we are trying to prevent. this means we can safely check
          d->postedEvents, since we are fairly sure it will not
          change (it could, but only by decreasing, i.e. removing
          posted events from a differebnt thread)
        */
        if (d->postedEvents > 0)
            QCoreApplication::removePostedEvents(this);
    }

    if (d->parent)        // remove it from parent object
        d->setParent_helper(0);

    d->threadData->deref();

    delete d;
    d_ptr = 0;
}


QString QObject::objectName() const
{
    Q_D(const QObject);
    return d->objectName;
}

/*
    Sets the object's name to \a name.
*/
void QObject::setObjectName(const QString &name)
{
    Q_D(QObject);
    d->objectName = name;
}


#ifdef QT3_SUPPORT

static QObject *qChildHelper(const char *objName, const char *inheritsClass,
                             bool recursiveSearch, const QObjectList &children)
{
    if (children.isEmpty())
        return 0;

    bool onlyWidgets = (inheritsClass && qstrcmp(inheritsClass, "QWidget") == 0);
    const QLatin1String oName(objName);
    for (int i = 0; i < children.size(); ++i) {
        QObject *obj = children.at(i);
        if (onlyWidgets) {
            if (obj->isWidgetType() && (!objName || obj->objectName() == oName))
                return obj;
        } else if ((!inheritsClass || obj->inherits(inheritsClass))
                   && (!objName || obj->objectName() == oName))
            return obj;
        if (recursiveSearch && (obj = qChildHelper(objName, inheritsClass,
                                                   recursiveSearch, obj->children())))
            return obj;
    }
    return 0;
}


QObject* QObject::child(const char *objName, const char *inheritsClass,
                         bool recursiveSearch) const
{
    Q_D(const QObject);
    return qChildHelper(objName, inheritsClass, recursiveSearch, d->children);
}
#endif

bool QObject::event(QEvent *e)
{
    switch (e->type()) {
    case QEvent::Timer:
        timerEvent((QTimerEvent*)e);
        break;

    case QEvent::ChildAdded:
    case QEvent::ChildPolished:
#ifdef QT3_SUPPORT
    case QEvent::ChildInserted:
#endif
    case QEvent::ChildRemoved:
        childEvent((QChildEvent*)e);
        break;

    case QEvent::DeferredDelete:
        delete this;
        break;

    case QEvent::MetaCall:
        {
            Q_D(QObject);
            QMetaCallEvent *mce = static_cast<QMetaCallEvent*>(e);
            QObject *previousSender = d->currentSender;
            int previousFrom = d->currentSenderSignalIdStart;
            int previousTo = d->currentSenderSignalIdEnd;
            d->currentSender = const_cast<QObject*>(mce->sender());
            d->currentSenderSignalIdStart = mce->signalIdStart();
            d->currentSenderSignalIdEnd = mce->signalIdEnd();
#if defined(QT_NO_EXCEPTIONS)
            qt_metacall(QMetaObject::InvokeMetaMethod, mce->id(), mce->args());
#else
            try {
                qt_metacall(QMetaObject::InvokeMetaMethod, mce->id(), mce->args());
            } catch (...) {
                QReadLocker locker(QObjectPrivate::readWriteLock());
                if (QObjectPrivate::isValidObject(this)) {
                    d->currentSender = previousSender;
                    d->currentSenderSignalIdStart = previousFrom;
                    d->currentSenderSignalIdEnd = previousTo;
                }
                throw;
            }
#endif
            QReadLocker locker(QObjectPrivate::readWriteLock());
            if (QObjectPrivate::isValidObject(this)) {
                d->currentSender = previousSender;
                d->currentSenderSignalIdStart = previousFrom;
                d->currentSenderSignalIdEnd = previousTo;
            }
            break;
        }

    case QEvent::ThreadChange: {
        QThreadData *threadData = d_func()->threadData;
        QAbstractEventDispatcher *eventDispatcher = threadData->eventDispatcher;
        if (eventDispatcher) {
            QList<QPair<int, int> > timers = eventDispatcher->registeredTimers(this);
            if (!timers.isEmpty()) {
                eventDispatcher->unregisterTimers(this);
                QMetaObject::invokeMethod(this, "_q_reregisterTimers", Qt::QueuedConnection,
                                          Q_ARG(void*, (new QList<QPair<int, int> >(timers))));
            }
        }
        break;
    }

    default:
        if (e->type() >= QEvent::User) {
            customEvent(e);
            break;
        }
        return false;
    }
    return true;
}

void QObject::timerEvent(QTimerEvent *)
{
}


void QObject::childEvent(QChildEvent * /* event */)
{
}


void QObject::customEvent(QEvent * /* event */)
{
}



bool QObject::eventFilter(QObject * /* watched */, QEvent * /* event */)
{
    return false;
}

bool QObject::blockSignals(bool block)
{
    Q_D(QObject);
    bool previous = d->blockSig;
    d->blockSig = block;
    return previous;
}

QThread *QObject::thread() const
{
    return d_func()->threadData->thread;
}

void QObject::moveToThread(QThread *targetThread)
{
    Q_D(QObject);

    if (d->threadData->thread == targetThread) {
        // object is already in this thread
        return;
    }

    if (d->parent != 0) {
        qWarning("QObject::moveToThread: Cannot move objects with a parent");
        return;
    }
    if (d->isWidget) {
        qWarning("QObject::moveToThread: Widgets cannot be moved to a new thread");
        return;
    }

    QThreadData *currentData = QThreadData::current();
    QThreadData *targetData = targetThread ? QThreadData::get2(targetThread) : new QThreadData(0);
    if (d->threadData->thread == 0 && currentData == targetData) {
        // one exception to the rule: we allow moving objects with no thread affinity to the current thread
        currentData = d->threadData;
    } else if (d->threadData != currentData) {
        qWarning("QObject::moveToThread: Current thread (%p) is not the object's thread (%p).\n"
                 "Cannot move to target thread (%p)\n",
                 d->threadData->thread, currentData->thread, targetData->thread);
        return;
    }

    // prepare to move
    d->moveToThread_helper();

    QWriteLocker locker(QObjectPrivate::readWriteLock());
    if (currentData != targetData) {
        targetData->postEventList.mutex.lock();
        while (currentData && !currentData->postEventList.mutex.tryLock()) {
            targetData->postEventList.mutex.unlock();
            targetData->postEventList.mutex.lock();
        }
    }

    // keep currentData alive (since we've got it locked)
    currentData->ref();

    // move the object
    d_func()->setThreadData_helper(currentData, targetData);

    if (currentData != targetData) {
        targetData->postEventList.mutex.unlock();
        if (currentData)
            currentData->postEventList.mutex.unlock();
    }

    // now currentData can commit suicide if it wants to
    currentData->deref();
}

void QObjectPrivate::moveToThread_helper()
{
    Q_Q(QObject);
    QEvent e(QEvent::ThreadChange);
    QCoreApplication::sendEvent(q, &e);
    for (int i = 0; i < children.size(); ++i) {
        QObject *child = children.at(i);
        child->d_func()->moveToThread_helper();
    }
}

void QObjectPrivate::setThreadData_helper(QThreadData *currentData, QThreadData *targetData)
{
    Q_Q(QObject);

    // move posted events
    int eventsMoved = 0;
    for (int i = 0; i < currentData->postEventList.size(); ++i) {
        const QPostEvent &pe = currentData->postEventList.at(i);
        if (!pe.event)
            continue;
        if (pe.receiver == q) {
            // move this post event to the targetList
            targetData->postEventList.append(pe);
            const_cast<QPostEvent &>(pe).event = 0;
            ++eventsMoved;
        }
    }
    if (eventsMoved > 0 && targetData->eventDispatcher)
        targetData->eventDispatcher->wakeUp();

    // set new thread data
    targetData->ref();
    threadData->deref();
    threadData = targetData;

    for (int i = 0; i < children.size(); ++i) {
        QObject *child = children.at(i);
        child->d_func()->setThreadData_helper(currentData, targetData);
    }
}

void QObjectPrivate::_q_reregisterTimers(void *pointer)
{
    Q_Q(QObject);
    QList<QPair<int, int> > *timerList = reinterpret_cast<QList<QPair<int, int> > *>(pointer);
    QAbstractEventDispatcher *eventDispatcher = threadData->eventDispatcher;
    for (int i = 0; i < timerList->size(); ++i) {
        const QPair<int, int> &pair = timerList->at(i);
        eventDispatcher->registerTimer(pair.first, pair.second, q);
    }
    delete timerList;
}


//
// The timer flag hasTimer is set when startTimer is called.
// It is not reset when killing the timer because more than
// one timer might be active.
//

int QObject::startTimer(int interval)
{
    Q_D(QObject);

    if (interval < 0) {
        qWarning("QObject::startTimer: QTimer cannot have a negative interval");
        return 0;
    }

    d->pendTimer = true;                                // set timer flag

    if (!d->threadData->eventDispatcher) {
        qWarning("QObject::startTimer: QTimer can only be used with threads started with QThread");
        return 0;
    }
    return d->threadData->eventDispatcher->registerTimer(interval, this);
}

void QObject::killTimer(int id)
{
    Q_D(QObject);
    if (d->threadData->eventDispatcher)
        d->threadData->eventDispatcher->unregisterTimer(id);
}


#ifdef QT3_SUPPORT
static void objSearch(QObjectList &result,
                       const QObjectList &list,
                       const char  *inheritsClass,
                       bool onlyWidgets,
                       const char  *objName,
                       QRegExp           *rx,
                       bool            recurse)
{
    for (int i = 0; i < list.size(); ++i) {
        QObject *obj = list.at(i);
        bool ok = true;
        if (onlyWidgets)
            ok = obj->isWidgetType();
        else if (inheritsClass && !obj->inherits(inheritsClass))
            ok = false;
        if (ok) {
            if (objName)
                ok = (obj->objectName() == QLatin1String(objName));
#ifndef QT_NO_REGEXP
            else if (rx)
                ok = (rx->indexIn(obj->objectName()) != -1);
#endif
        }
        if (ok)                                // match!
            result.append(obj);
        if (recurse) {
            QObjectList clist = obj->children();
            if (!clist.isEmpty())
                objSearch(result, clist, inheritsClass,
                           onlyWidgets, objName, rx, recurse);
        }
    }
}

QObjectList QObject::queryList(const char *inheritsClass,
                                const char *objName,
                                bool regexpMatch,
                                bool recursiveSearch) const
{
    Q_D(const QObject);
    QObjectList list;
    bool onlyWidgets = (inheritsClass && qstrcmp(inheritsClass, "QWidget") == 0);
#ifndef QT_NO_REGEXP
    if (regexpMatch && objName) {                // regexp matching
        QRegExp rx(QString::fromLatin1(objName));
        objSearch(list, d->children, inheritsClass, onlyWidgets, 0, &rx, recursiveSearch);
    } else
#endif
    {
        objSearch(list, d->children, inheritsClass, onlyWidgets, objName, 0, recursiveSearch);
    }
    return list;
}
#endif

void qt_qFindChildren_helper(const QObject *parent, const QString &name, const QRegExp *re,
                         const QMetaObject &mo, QList<void*> *list)
{
    if (!parent || !list)
        return;
    const QObjectList &children = parent->children();
    QObject *obj;
    for (int i = 0; i < children.size(); ++i) {
        obj = children.at(i);
        if (mo.cast(obj)) {
            if (re) {
                if (re->indexIn(obj->objectName()) != -1)
                    list->append(obj);
            } else {
                if (name.isNull() || obj->objectName() == name)
                    list->append(obj);
            }
        }
        qt_qFindChildren_helper(obj, name, re, mo, list);
    }
}

QObject *qt_qFindChild_helper(const QObject *parent, const QString &name, const QMetaObject &mo)
{
    if (!parent)
        return 0;
    const QObjectList &children = parent->children();
    QObject *obj;
    int i;
    for (i = 0; i < children.size(); ++i) {
        obj = children.at(i);
        if (mo.cast(obj) && (name.isNull() || obj->objectName() == name))
            return obj;
    }
    for (i = 0; i < children.size(); ++i) {
        obj = qt_qFindChild_helper(children.at(i), name, mo);
        if (obj)
            return obj;
    }
    return 0;
}

void QObject::setParent(QObject *parent)
{
    Q_D(QObject);
    Q_ASSERT(!d->isWidget);
    d->setParent_helper(parent);
}

void QObjectPrivate::deleteChildren()
{
    const bool reallyWasDeleted = wasDeleted;
    wasDeleted = true;
    // delete children objects
    // don't use qDeleteAll as the destructor of the child might
    // delete siblings
    for (int i = 0; i < children.count(); ++i) {
        currentChildBeingDeleted = children.at(i);
        children[i] = 0;
        delete currentChildBeingDeleted;
    }
    children.clear();
    currentChildBeingDeleted = 0;
    wasDeleted = reallyWasDeleted;
}

void QObjectPrivate::setParent_helper(QObject *o)
{
    Q_Q(QObject);
    if (o == parent)
        return;
    if (parent) {
        QObjectPrivate *parentD = parent->d_func();
        if (parentD->wasDeleted && wasDeleted
            && parentD->currentChildBeingDeleted == q) {
            // don't do anything since QObjectPrivate::deleteChildren() already
            // cleared our entry in parentD->children.
        } else {
            const int index = parentD->children.indexOf(q);
            if (parentD->wasDeleted) {
                parentD->children[index] = 0;
            } else {
                parentD->children.removeAt(index);
                if (sendChildEvents && parentD->receiveChildEvents) {
                    QChildEvent e(QEvent::ChildRemoved, q);
                    QCoreApplication::sendEvent(parent, &e);
                }
            }
        }
    }
    parent = o;
    if (parent) {
        // object hierarchies are constrained to a single thread
        if (threadData != parent->d_func()->threadData) {
            qWarning("QObject::setParent: New parent must be in the same thread as the previous parent");
            parent = 0;
            return;
        }
        parent->d_func()->children.append(q);
        if(sendChildEvents && parent->d_func()->receiveChildEvents) {
            if (!isWidget) {
                QChildEvent e(QEvent::ChildAdded, q);
                QCoreApplication::sendEvent(parent, &e);
#ifdef QT3_SUPPORT
                QCoreApplication::postEvent(parent, new QChildEvent(QEvent::ChildInserted, q));
#endif
            }
        }
    }
}

void QObject::installEventFilter(QObject *obj)
{
    Q_D(QObject);
    if (!obj)
        return;

    QWriteLocker locker(QObjectPrivate::readWriteLock());

    // clean up unused items in the list
    d->eventFilters.removeAll((QObject*)0);
    d->eventFilters.removeAll(obj);
    d->eventFilters.prepend(obj);
}

void QObject::removeEventFilter(QObject *obj)
{
    Q_D(QObject);
    QWriteLocker locker(QObjectPrivate::readWriteLock());
    d->eventFilters.removeAll(obj);
}


void QObject::deleteLater()
{
    QCoreApplication::postEvent(this, new QEvent(QEvent::DeferredDelete));
}

/*****************************************************************************
  Signals and slots
 *****************************************************************************/

static bool check_signal_macro(const QObject *sender, const char *signal,
                                const char *func, const char *op)
{
    int sigcode = (int)(*signal) - '0';
    if (sigcode != QSIGNAL_CODE) {
        if (sigcode == QSLOT_CODE)
            qWarning("Object::%s: Attempt to %s non-signal %s::%s",
                     func, op, sender->metaObject()->className(), signal+1);
        else
            qWarning("Object::%s: Use the SIGNAL macro to %s %s::%s",
                     func, op, sender->metaObject()->className(), signal);
        return false;
    }
    return true;
}

static bool check_method_code(int code, const QObject *object,
                               const char *method, const char *func)
{
    if (code != QSLOT_CODE && code != QSIGNAL_CODE) {
        qWarning("Object::%s: Use the SLOT or SIGNAL macro to "
                 "%s %s::%s", func, func, object->metaObject()->className(), method);
        return false;
    }
    return true;
}

static void err_method_notfound(int code, const QObject *object,
                                 const char *method, const char *func)
{
    const char *type = 0;
    switch (code) {
        case QSLOT_CODE:   type = "slot";   break;
        case QSIGNAL_CODE: type = "signal"; break;
    }
    if (strchr(method,')') == 0)                // common typing mistake
        qWarning("Object::%s: Parentheses expected, %s %s::%s",
                 func, type, object->metaObject()->className(), method);
    else
        qWarning("Object::%s: No such %s %s::%s",
                 func, type, object->metaObject()->className(), method);
}


static void err_info_about_objects(const char * func,
                                    const QObject * sender,
                                    const QObject * receiver)
{
    QString a = sender ? sender->objectName() : QString();
    QString b = receiver ? receiver->objectName() : QString();
    if (!a.isEmpty())
        qWarning("Object::%s:  (sender name:   '%s')", func, a.toLocal8Bit().data());
    if (!b.isEmpty())
        qWarning("Object::%s:  (receiver name: '%s')", func, b.toLocal8Bit().data());
}

QObject *QObject::sender() const
{
    Q_D(const QObject);
    QConnectionList * const list = ::connectionList();
    if (!list)
        return 0;

    QReadLocker locker(&list->lock);
    QConnectionList::Hash::const_iterator it = list->sendersHash.constFind(d->currentSender);
    const QConnectionList::Hash::const_iterator end = list->sendersHash.constEnd();

    // Return 0 if d->currentSender isn't in the senders hash (it has been destroyed?)
    if (it == end)
        return 0;

    // Only return d->currentSender if it's actually connected to "this"
    for (; it != end && it.key() == d->currentSender; ++it) {
        const int at = it.value();
        const QConnection &c = list->connections.at(at);

        if (c.receiver == this)
            return d->currentSender;
    }

    return 0;
}

int QObject::receivers(const char *signal) const
{
    int receivers = 0;
    if (signal) {
        QByteArray signal_name = QMetaObject::normalizedSignature(signal);
        signal = signal_name;
#ifndef QT_NO_DEBUG
        if (!check_signal_macro(this, signal, "receivers", "bind"))
            return 0;
#endif
        signal++; // skip code
        const QMetaObject *smeta = this->metaObject();
        int signal_index = smeta->indexOfSignal(signal);
        if (signal_index < 0) {
#ifndef QT_NO_DEBUG
            err_method_notfound(QSIGNAL_CODE, this, signal, "receivers");
#endif
            return false;
        }
        QConnectionList *list = ::connectionList();
        QReadLocker locker(&list->lock);
        QHash<const QObject *, int>::const_iterator i = list->sendersHash.constFind(this);
        while (i != list->sendersHash.constEnd() && i.key() == this) {
            if (list->connections.at(i.value()).signal == signal_index)
                ++receivers;
            ++i;
        }
    }
    return receivers;
}

bool QObject::connect(const QObject *sender, const char *signal,
                      const QObject *receiver, const char *method,
                      Qt::ConnectionType type)
{
    {
        const void *cbdata[] = { sender, signal, receiver, method, &type };
        if (QInternal::activateCallbacks(QInternal::ConnectCallback, (void **) cbdata))
            return true;
    }

#ifndef QT_NO_DEBUG
    bool warnCompat = true;
#endif
    if (type == Qt::AutoCompatConnection) {
        type = Qt::AutoConnection;
#ifndef QT_NO_DEBUG
        warnCompat = false;
#endif
    }

    if (sender == 0 || receiver == 0 || signal == 0 || method == 0) {
        qWarning("QObject::connect: Cannot connect %s::%s to %s::%s",
                 sender ? sender->metaObject()->className() : "(null)",
                 (signal && *signal) ? signal+1 : "(null)",
                 receiver ? receiver->metaObject()->className() : "(null)",
                 (method && *method) ? method+1 : "(null)");
        return false;
    }
    QByteArray tmp_signal_name;

    if (!check_signal_macro(sender, signal, "connect", "bind"))
        return false;
    const QMetaObject *smeta = sender->metaObject();
    ++signal; //skip code
    int signal_index = smeta->indexOfSignal(signal);
    if (signal_index < 0) {
        // check for normalized signatures
        tmp_signal_name = QMetaObject::normalizedSignature(signal).prepend(*(signal - 1));
        signal = tmp_signal_name.constData() + 1;
        signal_index = smeta->indexOfSignal(signal);
        if (signal_index < 0) {
            err_method_notfound(QSIGNAL_CODE, sender, signal, "connect");
            err_info_about_objects("connect", sender, receiver);
            return false;
        }
    }

    QByteArray tmp_method_name;
    int membcode = method[0] - '0';

    if (!check_method_code(membcode, receiver, method, "connect"))
        return false;
    ++method; // skip code

    const QMetaObject *rmeta = receiver->metaObject();
    int method_index = -1;
    switch (membcode) {
    case QSLOT_CODE:
        method_index = rmeta->indexOfSlot(method);
        break;
    case QSIGNAL_CODE:
        method_index = rmeta->indexOfSignal(method);
        break;
    }
    if (method_index < 0) {
        // check for normalized methods
        tmp_method_name = QMetaObject::normalizedSignature(method);
        method = tmp_method_name.constData();
        switch (membcode) {
        case QSLOT_CODE:
            method_index = rmeta->indexOfSlot(method);
            break;
        case QSIGNAL_CODE:
            method_index = rmeta->indexOfSignal(method);
            break;
        }
    }

    if (method_index < 0) {
        err_method_notfound(membcode, receiver, method, "connect");
        err_info_about_objects("connect", sender, receiver);
        return false;
    }
    if (!QMetaObject::checkConnectArgs(signal, method)) {
        qWarning("QObject::connect: Incompatible sender/receiver arguments"
                 "\n\t%s::%s --> %s::%s",
                 sender->metaObject()->className(), signal,
                 receiver->metaObject()->className(), method);
        return false;
    }

    int *types = 0;
    if (type == Qt::QueuedConnection
            && !(types = ::queuedConnectionTypes(smeta->method(signal_index).parameterTypes())))
        return false;

#ifndef QT_NO_DEBUG
    {
        QMetaMethod smethod = smeta->method(signal_index);
        QMetaMethod rmethod = rmeta->method(method_index);
        if (warnCompat) {
            if(smethod.attributes() & QMetaMethod::Compatibility) {
                if (!(rmethod.attributes() & QMetaMethod::Compatibility))
                    qWarning("QObject::connect: Connecting from COMPAT signal (%s::%s)", smeta->className(), signal);
            } else if(rmethod.attributes() & QMetaMethod::Compatibility && membcode != QSIGNAL_CODE) {
                qWarning("QObject::connect: Connecting from %s::%s to COMPAT slot (%s::%s)",
                         smeta->className(), signal, rmeta->className(), method);
            }
        }
    }
#endif
    QMetaObject::connect(sender, signal_index, receiver, method_index, type, types);
    const_cast<QObject*>(sender)->connectNotify(signal - 1);
    return true;
}


bool QObject::disconnect(const QObject *sender, const char *signal,
                         const QObject *receiver, const char *method)
{
    if (sender == 0 || (receiver == 0 && method != 0)) {
        qWarning("Object::disconnect: Unexpected null parameter");
        return false;
    }

    {
        const void *cbdata[] = { sender, signal, receiver, method };
        if (QInternal::activateCallbacks(QInternal::DisconnectCallback, (void **) cbdata))
            return true;
    }

    QByteArray signal_name;
    bool signal_found = false;
    if (signal) {
        signal_name = QMetaObject::normalizedSignature(signal);
        signal = signal_name;
        if (!check_signal_macro(sender, signal, "disconnect", "unbind"))
            return false;
        signal++; // skip code
    }

    QByteArray method_name;
    int membcode = -1;
    bool method_found = false;
    if (method) {
        method_name = QMetaObject::normalizedSignature(method);
        method = method_name;
        membcode = method[0] - '0';
        if (!check_method_code(membcode, receiver, method, "disconnect"))
            return false;
        method++; // skip code
    }

    /* We now iterate through all the sender's and receiver's meta
     * objects in order to also disconnect possibly shadowed signals
     * and slots with the same signature.
    */
    bool res = false;
    const QMetaObject *smeta = sender->metaObject();
    do {
        int signal_index = -1;
        if (signal) {
            signal_index = smeta->indexOfSignal(signal);
            if (signal_index < smeta->methodOffset())
                continue;
            signal_found = true;
        }

        if (!method) {
            res |= QMetaObject::disconnect(sender, signal_index, receiver, -1);
        } else {
            const QMetaObject *rmeta = receiver->metaObject();
            do {
                int method_index = rmeta->indexOfMethod(method);
                if (method_index >= 0)
                    while (method_index < rmeta->methodOffset())
                            rmeta = rmeta->superClass();
                if (method_index < 0)
                    break;
                res |= QMetaObject::disconnect(sender, signal_index, receiver, method_index);
                method_found = true;
            } while ((rmeta = rmeta->superClass()));
        }
    } while (signal && (smeta = smeta->superClass()));

    if (signal && !signal_found) {
        err_method_notfound(QSIGNAL_CODE, sender, signal, "disconnect");
        err_info_about_objects("disconnect", sender, receiver);
    } else if (method && !method_found) {
        err_method_notfound(membcode, receiver, method, "disconnect");
        err_info_about_objects("disconnect", sender, receiver);
    }
    if (res)
        const_cast<QObject*>(sender)->disconnectNotify(signal ? (signal - 1) : 0);
    return res;
}


void QObject::connectNotify(const char *)
{
}

void QObject::disconnectNotify(const char *)
{
}

bool QMetaObject::connect(const QObject *sender, int signal_index,
                          const QObject *receiver, int method_index, int type, int *types)
{
    QConnectionList *list = ::connectionList();
    if (!list)
        return false;
    QWriteLocker locker(&list->lock);
    list->addConnection(const_cast<QObject *>(sender), signal_index,
                        const_cast<QObject *>(receiver), method_index, type, types);
    return true;
}


bool QMetaObject::disconnect(const QObject *sender, int signal_index,
                             const QObject *receiver, int method_index)
{
    if (!sender)
        return false;
    QConnectionList *list = ::connectionList();
    if (!list)
        return false;
    QWriteLocker locker(&list->lock);
    return list->removeConnection(const_cast<QObject*>(sender), signal_index,
                                  const_cast<QObject*>(receiver), method_index);
}

void QMetaObject::connectSlotsByName(QObject *o)
{
    if (!o)
        return;
    const QMetaObject *mo = o->metaObject();
    Q_ASSERT(mo);
    const QObjectList list = qFindChildren<QObject *>(o, QString());
    for (int i = 0; i < mo->methodCount(); ++i) {
        const char *slot = mo->method(i).signature();
        Q_ASSERT(slot);
        if (slot[0] != 'o' || slot[1] != 'n' || slot[2] != '_')
            continue;
        bool foundIt = false;
        for(int j = 0; j < list.count(); ++j) {
            const QObject *co = list.at(j);
            QByteArray objName = co->objectName().toAscii();
            int len = objName.length();
            if (!len || qstrncmp(slot + 3, objName.data(), len) || slot[len+3] != '_')
                continue;
            const QMetaObject *smo = co->metaObject();
            int sigIndex = smo->indexOfMethod(slot + len + 4);
            if (sigIndex < 0) { // search for compatible signals
                int slotlen = qstrlen(slot + len + 4) - 1;
                for (int k = 0; k < co->metaObject()->methodCount(); ++k) {
                    if (smo->method(k).methodType() != QMetaMethod::Signal)
                        continue;

                    if (!qstrncmp(smo->method(k).signature(), slot + len + 4, slotlen)) {
                        sigIndex = k;
                        break;
                    }
                }
            }
            if (sigIndex < 0)
                continue;
            if (QMetaObject::connect(co, sigIndex, o, i)) {
                foundIt = true;
                break;
            }
        }
        if (foundIt) {
            // we found our slot, now skip all overloads
            while (mo->method(i + 1).attributes() & QMetaMethod::Cloned)
                  ++i;
        } else if (!(mo->method(i).attributes() & QMetaMethod::Cloned)) {
            qWarning("QMetaObject::connectSlotsByName: No matching signal for %s", slot);
        }
    }
}

static void queued_activate(QObject *sender, const QConnection &c, void **argv, int idFrom, int idTo)
{
    if (!c.types || c.types != &DIRECT_CONNECTION_ONLY) {
        QMetaMethod m = sender->metaObject()->method(c.signal);
        QConnection &x = const_cast<QConnection &>(c);
        int *tmp = ::queuedConnectionTypes(m.parameterTypes());
        if (!tmp) // cannot queue arguments
            tmp = &DIRECT_CONNECTION_ONLY;
        if (!q_atomic_test_and_set_ptr(&x.types, 0, tmp)) {
            if (tmp != &DIRECT_CONNECTION_ONLY)
                qFree(tmp);
        }
    }
    if (c.types == &DIRECT_CONNECTION_ONLY) // cannot activate
        return;
    int nargs = 1; // include return type
    while (c.types[nargs-1]) { ++nargs; }
    int *types = (int *) qMalloc(nargs*sizeof(int));
    void **args = (void **) qMalloc(nargs*sizeof(void *));
    types[0] = 0; // return type
    args[0] = 0; // return value
    for (int n = 1; n < nargs; ++n)
        args[n] = QMetaType::construct((types[n] = c.types[n-1]), argv[n]);
    QCoreApplication::postEvent(c.receiver, new QMetaCallEvent(c.method,
                                                               sender,
                                                               idFrom,
                                                               idTo,
                                                               nargs,
                                                               types,
                                                               args));
}

void QMetaObject::activate(QObject *sender, int from_signal_index, int to_signal_index, void **argv)
{
    if (sender->d_func()->blockSig)
        return;

    QConnectionList * const list = ::connectionList();
    if (!list)
        return;

    void *empty_argv[] = { 0 };
    if (qt_signal_spy_callback_set.signal_begin_callback != 0) {
        qt_signal_spy_callback_set.signal_begin_callback(sender, from_signal_index,
                                                         argv ? argv : empty_argv);
    }

    QReadLocker locker(&list->lock);

    QConnectionList::Hash::const_iterator it = list->sendersHash.constFind(sender);
    const QConnectionList::Hash::const_iterator start = it;
    const QConnectionList::Hash::const_iterator end = list->sendersHash.constEnd();

    if (start == end) {
        locker.unlock();
        if (qt_signal_spy_callback_set.signal_end_callback != 0)
            qt_signal_spy_callback_set.signal_end_callback(sender, from_signal_index);
        return;
    }

    QThreadData *currentThreadData = QThreadData::current();

    // QVarLengthArray doesn't use the same growth strategy as the rest of the Tulip classes, so we need to
    // determine the exact number of connections
    int i = 0;
    for (it = start; it != end && it.key() == sender; ++it) {
        ++i;
    }
    QVarLengthArray<int> connections(i);
    for (i = 0, it = start; it != end && it.key() == sender; ++i, ++it) {
        connections.data()[i] = it.value();
        ++list->connections[it.value()].refCount;
    }

    for (i = 0; i < connections.size(); ++i) {
        const int at = connections.constData()[connections.size() - (i + 1)];
        QConnectionList * const list = ::connectionList();
        QConnection *c = &list->connections[at];
        --c->refCount;
        if (!c->receiver || ((c->signal < from_signal_index || c->signal > to_signal_index) &&
                            c->signal != -1))
            continue;

        // determine if this connection should be sent immediately or
        // put into the event queue
        if ((c->type == Qt::AutoConnection
             && (currentThreadData != sender->d_func()->threadData
                 || c->receiver->d_func()->threadData != sender->d_func()->threadData))
            || (c->type == Qt::QueuedConnection)) {
            ::queued_activate(sender, *c, argv, from_signal_index, to_signal_index);
            continue;
        }

        const int method = c->method;
        QObject * const previousSender = c->receiver->d_func()->currentSender;
        int previousFrom = c->receiver->d_func()->currentSenderSignalIdStart;
        int previousTo = c->receiver->d_func()->currentSenderSignalIdEnd;
        c->receiver->d_func()->currentSender = sender;
        c->receiver->d_func()->currentSenderSignalIdStart = from_signal_index;
        c->receiver->d_func()->currentSenderSignalIdEnd = to_signal_index;
        locker.unlock();

        if (qt_signal_spy_callback_set.slot_begin_callback != 0)
            qt_signal_spy_callback_set.slot_begin_callback(c->receiver, method, argv ? argv : empty_argv);

#if defined(QT_NO_EXCEPTIONS)
        c->receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
#else
        try {
            c->receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
        } catch (...) {
            if (c->receiver) {
                c->receiver->d_func()->currentSender = previousSender;
                c->receiver->d_func()->currentSenderSignalIdStart = previousFrom;
                c->receiver->d_func()->currentSenderSignalIdEnd = previousTo;
            }
            throw;
        }
#endif
        c = &list->connections[at];

        if (qt_signal_spy_callback_set.slot_end_callback != 0)
            qt_signal_spy_callback_set.slot_end_callback(c->receiver, method);

        locker.relock();
        if (c->receiver) {
            c->receiver->d_func()->currentSender = previousSender;
            c->receiver->d_func()->currentSenderSignalIdStart = previousFrom;
            c->receiver->d_func()->currentSenderSignalIdEnd = previousTo;
        }
    }

    locker.unlock();

    if (qt_signal_spy_callback_set.signal_end_callback != 0)
        qt_signal_spy_callback_set.signal_end_callback(sender, from_signal_index);
}


void QMetaObject::activate(QObject *sender, int signal_index, void **argv)
{
    activate(sender, signal_index, signal_index, argv);
}

void QMetaObject::activate(QObject *sender, const QMetaObject *m, int local_signal_index,
                           void **argv)
{
    int offset = m->methodOffset();
    activate(sender, offset + local_signal_index, offset + local_signal_index, argv);
}

void QMetaObject::activate(QObject *sender, const QMetaObject *m,
                           int from_local_signal_index, int to_local_signal_index, void **argv)
{
    int offset = m->methodOffset();
    activate(sender, offset + from_local_signal_index, offset + to_local_signal_index, argv);
}


/*****************************************************************************
  Properties
 *****************************************************************************/

#ifndef QT_NO_PROPERTIES

bool QObject::setProperty(const char *name, const QVariant &value)
{
    Q_D(QObject);
    const QMetaObject* meta = metaObject();
    if (!name || !meta)
        return false;

    int id = meta->indexOfProperty(name);
    if (id < 0) {
        if (!d->extraData)
            d->extraData = new QObjectPrivate::ExtraData;

        const int idx = d->extraData->propertyNames.indexOf(name);

        if (value.isNull()) {
            if (idx == -1)
                return false;
            d->extraData->propertyNames.removeAt(idx);
            d->extraData->propertyValues.removeAt(idx);
        } else {
            if (idx == -1) {
                d->extraData->propertyNames.append(name);
                d->extraData->propertyValues.append(value);
            } else {
                d->extraData->propertyValues[idx] = value;
            }
        }

        QDynamicPropertyChangeEvent ev(name);
        QCoreApplication::sendEvent(this, &ev);

        return false;
    }
    QMetaProperty p = meta->property(id);
#ifndef QT_NO_DEBUG
    if (!p.isWritable())
        qWarning("%s::setProperty: Property \"%s\" invalid,"
                 " read-only or does not exist", metaObject()->className(), name);
#endif
    return p.write(this, value);
}

QVariant QObject::property(const char *name) const
{
    Q_D(const QObject);
    const QMetaObject* meta = metaObject();
    if (!name || !meta)
        return QVariant();

    int id = meta->indexOfProperty(name);
    if (id < 0) {
        if (!d->extraData)
            return QVariant();
        const int i = d->extraData->propertyNames.indexOf(name);
        return d->extraData->propertyValues.value(i);
    }
    QMetaProperty p = meta->property(id);
#ifndef QT_NO_DEBUG
    if (!p.isReadable())
        qWarning("%s::property: Property \"%s\" invalid or does not exist",
                 metaObject()->className(), name);
#endif
    return p.read(this);
}

QList<QByteArray> QObject::dynamicPropertyNames() const
{
    Q_D(const QObject);
    if (d->extraData)
        return d->extraData->propertyNames;
    return QList<QByteArray>();
}

#endif // QT_NO_PROPERTIES


/*****************************************************************************
  QObject debugging output routines.
 *****************************************************************************/

static void dumpRecursive(int level, QObject *object)
{
#if defined(QT_DEBUG)
    if (object) {
        QByteArray buf;
        buf.fill('\t', level/2);
        if (level % 2)
            buf += "    ";
        QString name = object->objectName();
        QString flags = QLatin1String("");
#if 0
        if (qApp->focusWidget() == object)
            flags += 'F';
        if (object->isWidgetType()) {
            QWidget * w = (QWidget *)object;
            if (w->isVisible()) {
                QString t("<%1,%2,%3,%4>");
                flags += t.arg(w->x()).arg(w->y()).arg(w->width()).arg(w->height());
            } else {
                flags += 'I';
            }
        }
#endif
        qDebug("%s%s::%s %s", (const char*)buf, object->metaObject()->className(), name.toLocal8Bit().data(),
               flags.toLatin1().data());
        QObjectList children = object->children();
        if (!children.isEmpty()) {
            for (int i = 0; i < children.size(); ++i)
                dumpRecursive(level+1, children.at(i));
        }
    }
#else
    Q_UNUSED(level)
        Q_UNUSED(object)
#endif
}

void QObject::dumpObjectTree()
{
    dumpRecursive(0, this);
}

void QObject::dumpObjectInfo()
{
#if defined(QT_DEBUG)
    qDebug("OBJECT %s::%s", metaObject()->className(),
           objectName().isEmpty() ? "unnamed" : objectName().toLocal8Bit().data());
    //#### signals and slots info missing
#endif
}

#ifndef QT_NO_USERDATA

uint QObject::registerUserData()
{
    static int user_data_registration = 0;
    return user_data_registration++;
}

QObjectUserData::~QObjectUserData()
{
}

void QObject::setUserData(uint id, QObjectUserData* data)
{
    Q_D(QObject);
    if (!d->extraData)
        d->extraData = new QObjectPrivate::ExtraData;

    if (d->extraData->userData.size() <= (int) id)
        d->extraData->userData.resize((int) id + 1);
    d->extraData->userData[id] = data;
}

QObjectUserData* QObject::userData(uint id) const
{
    Q_D(const QObject);
    if (!d->extraData)
        return 0;
    if ((int)id < d->extraData->userData.size())
        return d->extraData->userData.at(id);
    return 0;
}

#endif // QT_NO_USERDATA


#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QObject *o) {
#ifndef Q_BROKEN_DEBUG_STREAM
    if (!o)
        return dbg << "QObject(0x0) ";
    dbg.nospace() << o->metaObject()->className() << "(" << (void *)o;
    if (!o->objectName().isEmpty())
        dbg << ", name = " << o->objectName();
    dbg << ')';
    return dbg.space();
#else
    qWarning("This compiler doesn't support streaming QObject to QDebug");
    return dbg;
    Q_UNUSED(o);
#endif
}
#endif

#include "moc_qobject.cpp"

---