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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 <qsemaphore.h>
+
+#include <private/qorderedmutexlocker_p.h>
+
+#include <new>
+
+#include <ctype.h>
+#include <limits.h>
+
+QT_BEGIN_NAMESPACE
+
+static int DIRECT_CONNECTION_ONLY = 0;
+
+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 registered using qRegisterMetaType().)",
+ typeName.constData(), typeName.constData());
+ qFree(types);
+ return 0;
+ }
+ }
+ types[typeNames.count()] = 0;
+
+ return types;
+}
+
+extern "C" Q_CORE_EXPORT void qt_addObject(QObject *)
+{
+}
+
+extern "C" Q_CORE_EXPORT void qt_removeObject(QObject *)
+{
+}
+
+QObjectPrivate::QObjectPrivate(int version)
+ : threadData(0), currentSender(0), currentChildBeingDeleted(0), connectionLists(0)
+{
+ 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;
+ extraData = 0;
+ connectedSignals = 0;
+ inEventHandler = false;
+ inThreadChangeEvent = false;
+ deleteWatch = 0;
+}
+
+QObjectPrivate::~QObjectPrivate()
+{
+ if (deleteWatch)
+ *deleteWatch = 1;
+#ifndef QT_NO_USERDATA
+ if (extraData)
+ qDeleteAll(extraData->userData);
+ delete extraData;
+#endif
+}
+
+
+int *QObjectPrivate::setDeleteWatch(QObjectPrivate *d, int *w) {
+ int *old = d->deleteWatch;
+ d->deleteWatch = w;
+ return old;
+}
+
+
+void QObjectPrivate::resetDeleteWatch(QObjectPrivate *d, int *oldWatch, int deleteWatch) {
+ if (!deleteWatch)
+ d->deleteWatch = oldWatch;
+
+ if (oldWatch)
+ *oldWatch = deleteWatch;
+}
+
+
+
+
+
+#ifdef QT3_SUPPORT
+void QObjectPrivate::sendPendingChildInsertedEvents()
+{
+ Q_Q(QObject);
+ for (int i = 0; i < pendingChildInsertedEvents.size(); ++i) {
+ QObject *c = pendingChildInsertedEvents.at(i);
+ if (!c)
+ continue;
+ QChildEvent childEvent(QEvent::ChildInserted, c);
+ QCoreApplication::sendEvent(q, &childEvent);
+ }
+ pendingChildInsertedEvents.clear();
+}
+
+void QObjectPrivate::removePendingChildInsertedEvents(QObject *child)
+{
+ if (!child) {
+ pendingChildInsertedEvents.clear();
+ return;
+ }
+
+ // the QObject destructor calls QObject::removeChild, which calls
+ // QCoreApplication::sendEvent() directly. this can happen while the event
+ // loop is in the middle of posting events, and when we get here, we may
+ // not have any more posted events for this object.
+
+ // if this is a child remove event and the child insert hasn't
+ // been dispatched yet, kill that insert
+ for (int i = 0; i < pendingChildInsertedEvents.size(); ++i) {
+ QObject *&c = pendingChildInsertedEvents[i];
+ if (c == child)
+ c = 0;
+ }
+}
+#endif
+
+
+class QObjectConnectionListVector : public QVector<QObjectPrivate::ConnectionList>
+{
+public:
+ bool orphaned;
+ bool dirty;
+ int inUse;
+ QObjectPrivate::ConnectionList allsignals;
+
+ QObjectConnectionListVector()
+ : QVector<QObjectPrivate::ConnectionList>(), orphaned(false), dirty(false), inUse(0)
+ { }
+
+ const QObjectPrivate::ConnectionList &at(int at) const
+ {
+ if (at < 0)
+ return allsignals;
+ return QVector<QObjectPrivate::ConnectionList>::at(at);
+ }
+ QObjectPrivate::ConnectionList &operator[](int at)
+ {
+ if (at < 0)
+ return allsignals;
+ return QVector<QObjectPrivate::ConnectionList>::operator[](at);
+ }
+};
+
+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;
+ QMutexLocker locker(&threadData->mutex);
+ if (connectionLists) {
+ if (signal_index < connectionLists->count()) {
+ const ConnectionList &connectionList = connectionLists->at(signal_index);
+ for (int i = 0; i < connectionList.count(); ++i) {
+ const QObjectPrivate::Connection &c = connectionList.at(i);
+ if (c.receiver && c.receiver == receiver)
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+QObjectList QObjectPrivate::receiverList(const char *signal) const
+{
+ Q_Q(const QObject);
+ QObjectList returnValue;
+ int signal_index = q->metaObject()->indexOfSignal(signal);
+ if (signal_index < 0)
+ return returnValue;
+ QMutexLocker locker(&threadData->mutex);
+ if (connectionLists) {
+ if (signal_index < connectionLists->count()) {
+ const ConnectionList &connectionList = connectionLists->at(signal_index);
+ for (int i = 0; i < connectionList.count(); ++i) {
+ const QObjectPrivate::Connection &c = connectionList.at(i);
+ if (c.receiver)
+ returnValue << c.receiver;
+ }
+ }
+ }
+ return returnValue;
+}
+
+QObjectList QObjectPrivate::senderList() const
+{
+ QObjectList returnValue;
+ QMutexLocker locker(&threadData->mutex);
+ for (int i = 0; i < senders.count(); ++i)
+ returnValue << senders.at(i).sender;
+ return returnValue;
+}
+
+void QObjectPrivate::addConnection(int signal, Connection *c)
+{
+ if (!connectionLists)
+ connectionLists = new QObjectConnectionListVector();
+ if (signal >= connectionLists->count())
+ connectionLists->resize(signal + 1);
+
+ ConnectionList &connectionList = (*connectionLists)[signal];
+ connectionList.append(*c);
+
+ cleanConnectionLists();
+}
+
+void QObjectPrivate::removeReceiver(int signal, QObject *receiver)
+{
+ if (!connectionLists)
+ return;
+
+ if (signal >= connectionLists->count())
+ return;
+
+ ConnectionList &connectionList = (*connectionLists)[signal];
+ for (int i = 0; i < connectionList.count(); ++i) {
+ Connection &c = connectionList[i];
+ if (c.receiver == receiver) {
+ c.receiver = 0;
+ if (c.argumentTypes && c.argumentTypes != &DIRECT_CONNECTION_ONLY) {
+ qFree(c.argumentTypes);
+ c.argumentTypes = 0;
+ }
+ connectionLists->dirty = true;
+ }
+ }
+}
+
+void QObjectPrivate::cleanConnectionLists()
+{
+ if (connectionLists->dirty && !connectionLists->inUse) {
+ // remove broken connections
+ for (int signal = -1; signal < connectionLists->count(); ++signal) {
+ QObjectPrivate::ConnectionList &connectionList = (*connectionLists)[signal];
+ for (int i = 0; i < connectionList.count(); ++i) {
+ const QObjectPrivate::Connection &c = connectionList.at(i);
+ if (!c.receiver)
+ connectionList.removeAt(i--);
+ }
+ }
+ connectionLists->dirty = false;
+ }
+}
+
+void QObjectPrivate::refSender(QObject *sender, int signal)
+{
+ for (int i = 0; i < senders.count(); ++i) {
+ Sender &s = senders[i];
+ if (s.sender == sender && s.signal == signal) {
+ ++s.ref;
+ return;
+ }
+ }
+
+ Sender s = { sender, signal, 1 };
+ senders.append(s);
+}
+
+void QObjectPrivate::derefSender(QObject *sender, int signal)
+{
+ for (int i = 0; i < senders.count(); ++i) {
+ Sender &s = senders[i];
+ if (s.sender == sender && s.signal == signal) {
+ if (--s.ref == 0) {
+ senders.removeAt(i);
+ break;
+ }
+ }
+ }
+ // Q_ASSERT_X(false, "QObjectPrivate::derefSender", "sender not found");
+}
+
+void QObjectPrivate::removeSender(QObject *sender, int signal)
+{
+ for (int i = 0; i < senders.count(); ++i) {
+ Sender &s = senders[i];
+ if (s.sender == sender && s.signal == signal) {
+ senders.removeAt(i);
+ return;
+ }
+ }
+ // Q_ASSERT_X(false, "QObjectPrivate::removeSender", "sender not found");
+}
+
+QObjectPrivate::Sender *QObjectPrivate::setCurrentSender(QObject *receiver,
+ Sender *sender)
+{
+ Sender *previousSender = receiver->d_func()->currentSender;
+ receiver->d_func()->currentSender = sender;
+ return previousSender;
+}
+
+void QObjectPrivate::resetCurrentSender(QObject *receiver,
+ Sender *currentSender,
+ Sender *previousSender)
+{
+ // ref is set to zero when this object is deleted during the metacall
+ if (currentSender->ref == 1)
+ receiver->d_func()->currentSender = previousSender;
+ // if we've recursed, we need to tell the caller about the objects deletion
+ if (previousSender)
+ previousSender->ref = currentSender->ref;
+}
+
+
+typedef QMultiHash<QObject *, QObject **> GuardHash;
+Q_GLOBAL_STATIC(GuardHash, guardHash)
+Q_GLOBAL_STATIC(QMutex, guardHashLock)
+
+/*!\internal
+ */
+void QMetaObject::addGuard(QObject **ptr)
+{
+ if (!*ptr)
+ return;
+ GuardHash *hash = guardHash();
+ if (!hash) {
+ *ptr = 0;
+ return;
+ }
+ QMutexLocker locker(guardHashLock());
+ hash->insert(*ptr, ptr);
+}
+
+/*!\internal
+ */
+void QMetaObject::removeGuard(QObject **ptr)
+{
+ if (!*ptr)
+ return;
+ GuardHash *hash = guardHash();
+ if (!hash)
+ return;
+ QMutexLocker 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;
+ }
+ }
+}
+
+/*!\internal
+ */
+void QMetaObject::changeGuard(QObject **ptr, QObject *o)
+{
+ GuardHash *hash = guardHash();
+ if (!hash) {
+ *ptr = 0;
+ return;
+ }
+ QMutexLocker 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);
+}
+
+/*! \internal
+ */
+void QObjectPrivate::clearGuards(QObject *object)
+{
+ GuardHash *hash = guardHash();
+ if (hash) {
+ QMutexLocker 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);
+ }
+ }
+}
+
+/*! \internal
+ */
+QMetaCallEvent::QMetaCallEvent(int id, const QObject *sender, int signalId,
+ int nargs, int *types, void **args, QSemaphore *semaphore)
+ : QEvent(MetaCall), id_(id), sender_(sender), signalId_(signalId),
+ nargs_(nargs), types_(types), args_(args), semaphore_(semaphore)
+{ }
+
+/*! \internal
+ */
+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_);
+#ifndef QT_NO_THREAD
+ if (semaphore_)
+ semaphore_->release();
+#endif
+}
+
+/*! \internal
+ */
+int QMetaCallEvent::placeMetaCall(QObject *object)
+{
+ return object->qt_metacall(QMetaObject::InvokeMetaMethod, id_, args_);
+}
+
+/*!
+ \class QObject
+ \brief The QObject class is the base class of all Qt objects.
+
+ \ingroup objectmodel
+ \mainclass
+ \reentrant
+
+ QObject is the heart of the \l{Qt object model}. The central
+ feature in this model is a very powerful mechanism for seamless
+ object communication called \l{signals and slots}. You can
+ connect a signal to a slot with connect() and destroy the
+ connection with disconnect(). To avoid never ending notification
+ loops you can temporarily block signals with blockSignals(). The
+ protected functions connectNotify() and disconnectNotify() make
+ it possible to track connections.
+
+ QObjects organize themselves in object trees. When you create a
+ QObject with another object as parent, the object will
+ automatically add itself to the parent's children() list. The
+ parent takes ownership of the object i.e. it will automatically
+ delete its children in its destructor. You can look for an object
+ by name and optionally type using findChild() or findChildren().
+
+ Every object has an objectName() and its class name can be found
+ via the corresponding metaObject() (see QMetaObject::className()).
+ You can determine whether the object's class inherits another
+ class in the QObject inheritance hierarchy by using the
+ inherits() function.
+
+ When an object is deleted, it emits a destroyed() signal. You can
+ catch this signal to avoid dangling references to QObjects.
+
+ QObjects can receive events through event() and filter the events
+ of other objects. See installEventFilter() and eventFilter() for
+ details. A convenience handler, childEvent(), can be reimplemented
+ to catch child events.
+
+ Events are delivered in the thread in which the object was
+ created; see \l{Thread Support in Qt} and thread() for details.
+ Note that event processing is not done at all for QObjects with no
+ thread affinity (thread() returns zero). Use the moveToThread()
+ function to change the thread affinity for an object and its
+ children (the object cannot be moved if it has a parent).
+
+ Last but not least, QObject provides the basic timer support in
+ Qt; see QTimer for high-level support for timers.
+
+ Notice that the Q_OBJECT macro is mandatory for any object that
+ implements signals, slots or properties. You also need to run the
+ \l{moc}{Meta Object Compiler} on the source file. We strongly
+ recommend the use of this macro in all subclasses of QObject
+ regardless of whether or not they actually use signals, slots and
+ properties, since failure to do so may lead certain functions to
+ exhibit strange behavior.
+
+ All Qt widgets inherit QObject. The convenience function
+ isWidgetType() returns whether an object is actually a widget. It
+ is much faster than
+ \l{qobject_cast()}{qobject_cast}<QWidget *>(\e{obj}) or
+ \e{obj}->\l{inherits()}{inherits}("QWidget").
+
+ Some QObject functions, e.g. children(), return a QObjectList.
+ QObjectList is a typedef for QList<QObject *>.
+
+ \target No copy constructor
+ \section1 No copy constructor or assignment operator
+
+ QObject has neither a copy constructor nor an assignment operator.
+ This is by design. Actually, they are declared, but in a
+ \c{private} section with the macro Q_DISABLE_COPY(). In fact, all
+ Qt classes derived from QObject (direct or indirect) use this
+ macro to declare their copy constructor and assignment operator to
+ be private. The reasoning is found in the discussion on
+ \l{Identity vs Value} {Identity vs Value} on the \l{Qt Object
+ Model} page.
+
+ The main consequence is that you should use pointers to QObject
+ (or to your QObject subclass) where you might otherwise be tempted
+ to use your QObject subclass as a value. For example, without a
+ copy constructor, you can't use a subclass of QObject as the value
+ to be stored in one of the container classes. You must store
+ pointers.
+
+ \section2 Auto-Connection
+
+ Qt's meta-object system provides a mechanism to automatically connect
+ signals and slots between QObject subclasses and their children. As long
+ as objects are defined with suitable object names, and slots follow a
+ simple naming convention, this connection can be performed at run-time
+ by the QMetaObject::connectSlotsByName() function.
+
+ \l uic generates code that invokes this function to enable
+ auto-connection to be performed between widgets on forms created
+ with \QD. More information about using auto-connection with \QD is
+ given in the \l{Using a Designer .ui File in Your Application} section of
+ the \QD manual.
+
+ \section2 Dynamic Properties
+
+ From Qt 4.2, dynamic properties can be added to and removed from QObject
+ instances at run-time. Dynamic properties do not need to be declared at
+ compile-time, yet they provide the same advantages as static properties
+ and are manipulated using the same API - using property() to read them
+ and setProperty() to write them.
+
+ From Qt 4.3, dynamic properties are supported by
+ \l{Qt Designer's Widget Editing Mode#The Property Editor}{Qt Designer},
+ and both standard Qt widgets and user-created forms can be given dynamic
+ properties.
+
+ \sa QMetaObject, QPointer, QObjectCleanupHandler, Q_DISABLE_COPY()
+ {Object Trees and Object Ownership}
+*/
+
+/*!
+ \relates QObject
+
+ Returns a pointer to the object named \a name that inherits \a
+ type and with a given \a parent.
+
+ Returns 0 if there is no such child.
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 0
+*/
+
+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
+ *****************************************************************************/
+
+// check the constructor's parent thread argument
+static bool check_parent_thread(QObject *parent,
+ QThreadData *parentThreadData,
+ QThreadData *currentThreadData)
+{
+ if (parent && parentThreadData != currentThreadData) {
+ QThread *parentThread = parentThreadData->thread;
+ QThread *currentThread = currentThreadData->thread;
+ qWarning("QObject: Cannot create children for a parent that is in a different thread.\n"
+ "(Parent is %s(%p), parent's thread is %s(%p), current thread is %s(%p)",
+ parent->metaObject()->className(),
+ parent,
+ parentThread ? parentThread->metaObject()->className() : "QThread",
+ parentThread,
+ currentThread ? currentThread->metaObject()->className() : "QThread",
+ currentThread);
+ return false;
+ }
+ return true;
+}
+
+/*!
+ Constructs an object with parent object \a parent.
+
+ The parent of an object may be viewed as the object's owner. For
+ instance, a \l{QDialog}{dialog box} is the parent of the \gui OK
+ and \gui Cancel buttons it contains.
+
+ The destructor of a parent object destroys all child objects.
+
+ Setting \a parent to 0 constructs an object with no parent. If the
+ object is a widget, it will become a top-level window.
+
+ \sa parent(), findChild(), findChildren()
+*/
+
+QObject::QObject(QObject *parent)
+ : d_ptr(new QObjectPrivate)
+{
+ Q_D(QObject);
+ qt_addObject(d_ptr->q_ptr = this);
+ d->threadData = (parent && !parent->thread()) ? parent->d_func()->threadData : QThreadData::current();
+ d->threadData->ref();
+ if (!check_parent_thread(parent, parent ? parent->d_func()->threadData : 0, d->threadData))
+ parent = 0;
+ setParent(parent);
+}
+
+#ifdef QT3_SUPPORT
+/*!
+ \overload QObject()
+ \obsolete
+
+ Creates a new QObject with the given \a parent and object \a name.
+ */
+QObject::QObject(QObject *parent, const char *name)
+ : d_ptr(new QObjectPrivate)
+{
+ Q_D(QObject);
+ qt_addObject(d_ptr->q_ptr = this);
+ d->threadData = (parent && !parent->thread()) ? parent->d_func()->threadData : QThreadData::current();
+ d->threadData->ref();
+ if (!check_parent_thread(parent, parent ? parent->d_func()->threadData : 0, d->threadData))
+ parent = 0;
+ setParent(parent);
+ setObjectName(QString::fromAscii(name));
+}
+#endif
+
+/*! \internal
+ */
+QObject::QObject(QObjectPrivate &dd, QObject *parent)
+ : d_ptr(&dd)
+{
+ Q_D(QObject);
+ qt_addObject(d_ptr->q_ptr = this);
+ d->threadData = (parent && !parent->thread()) ? parent->d_func()->threadData : QThreadData::current();
+ d->threadData->ref();
+ if (!check_parent_thread(parent, parent ? parent->d_func()->threadData : 0, d->threadData))
+ 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);
+ }
+}
+
+/*!
+ Destroys the object, deleting all its child objects.
+
+ All signals to and from the object are automatically disconnected, and
+ any pending posted events for the object are removed from the event
+ queue. However, it is often safer to use deleteLater() rather than
+ deleting a QObject subclass directly.
+
+ \warning All child objects are deleted. If any of these objects
+ are on the stack or global, sooner or later your program will
+ crash. We do not recommend holding pointers to child objects from
+ outside the parent. If you still do, the destroyed() signal gives
+ you an opportunity to detect when an object is destroyed.
+
+ \warning Deleting a QObject while pending events are waiting to
+ be delivered can cause a crash. You must not delete the QObject
+ directly if it exists in a different thread than the one currently
+ executing. Use deleteLater() instead, which will cause the event
+ loop to delete the object after all pending events have been
+ delivered to it.
+
+ \sa deleteLater()
+*/
+
+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);
+
+ {
+ QMutexLocker locker(&d->threadData->mutex);
+
+ // set ref to zero to indicate that this object has been deleted
+ if (d->currentSender != 0)
+ d->currentSender->ref = 0;
+ d->currentSender = 0;
+
+ // disconnect all receivers
+ if (d->connectionLists) {
+ ++d->connectionLists->inUse;
+ for (int signal = -1; signal < d->connectionLists->count(); ++signal) {
+ QObjectPrivate::ConnectionList &connectionList = (*d->connectionLists)[signal];
+ for (int i = 0; i < connectionList.count(); ++i) {
+ QObjectPrivate::Connection *c = &connectionList[i];
+ if (!c->receiver)
+ continue;
+
+ QMutex *m = &c->receiver->d_func()->threadData->mutex;
+ bool needToUnlock = QOrderedMutexLocker::relock(locker.mutex(), m);
+ c = &connectionList[i];
+ if (c->receiver)
+ c->receiver->d_func()->removeSender(this, signal);
+ if (needToUnlock)
+ m->unlock();
+
+ if (c->argumentTypes && c->argumentTypes != &DIRECT_CONNECTION_ONLY) {
+ qFree(c->argumentTypes);
+ c->argumentTypes = 0;
+ }
+ c->receiver = 0;
+ }
+ }
+
+ if (!--d->connectionLists->inUse) {
+ delete d->connectionLists;
+ } else {
+ d->connectionLists->orphaned = true;
+ }
+ d->connectionLists = 0;
+ }
+
+ // disconnect all senders
+ for (int i = 0; i < d->senders.count(); ++i) {
+ QObjectPrivate::Sender *s = &d->senders[i];
+ if (!s->sender)
+ continue;
+
+ QMutex *m = &s->sender->d_func()->threadData->mutex;
+ bool needToUnlock = QOrderedMutexLocker::relock(locker.mutex(), m);
+ s = &d->senders[i];
+ if (s->sender)
+ s->sender->d_func()->removeReceiver(s->signal, this);
+ if (needToUnlock)
+ m->unlock();
+ }
+
+ d->senders.clear();
+ }
+
+ if (d->pendTimer) {
+ // unregister pending timers
+ if (d->threadData->eventDispatcher)
+ d->threadData->eventDispatcher->unregisterTimers(this);
+ }
+
+#ifdef QT3_SUPPORT
+ d->pendingChildInsertedEvents.clear();
+#endif
+
+ d->eventFilters.clear();
+
+ if (!d->children.isEmpty())
+ d->deleteChildren();
+
+ qt_removeObject(this);
+
+ QMutexLocker locker2(&d->threadData->postEventList.mutex);
+ if (d->postedEvents > 0)
+ QCoreApplicationPrivate::removePostedEvents_unlocked(this, 0, d->threadData);
+ locker2.unlock();
+
+ if (d->parent) // remove it from parent object
+ d->setParent_helper(0);
+
+ d->threadData->deref();
+
+#ifdef QT_JAMBI_BUILD
+ if (d->inEventHandler) {
+ qWarning("QObject: Do not delete object, '%s', during its event handler!",
+ objectName().isNull() ? "unnamed" : qPrintable(objectName()));
+ }
+#endif
+
+ delete d;
+ d_ptr = 0;
+}
+
+
+/*!
+ \fn QMetaObject *QObject::metaObject() const
+
+ Returns a pointer to the meta-object of this object.
+
+ A meta-object contains information about a class that inherits
+ QObject, e.g. class name, superclass name, properties, signals and
+ slots. Every QObject subclass that contains the Q_OBJECT macro will have a
+ meta-object.
+
+ The meta-object information is required by the signal/slot
+ connection mechanism and the property system. The inherits()
+ function also makes use of the meta-object.
+
+ If you have no pointer to an actual object instance but still
+ want to access the meta-object of a class, you can use \l
+ staticMetaObject.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 1
+
+ \sa staticMetaObject
+*/
+
+/*!
+ \variable QObject::staticMetaObject
+
+ This variable stores the meta-object for the class.
+
+ A meta-object contains information about a class that inherits
+ QObject, e.g. class name, superclass name, properties, signals and
+ slots. Every class that contains the Q_OBJECT macro will also have
+ a meta-object.
+
+ The meta-object information is required by the signal/slot
+ connection mechanism and the property system. The inherits()
+ function also makes use of the meta-object.
+
+ If you have a pointer to an object, you can use metaObject() to
+ retrieve the meta-object associated with that object.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 2
+
+ \sa metaObject()
+*/
+
+/*! \fn T *qobject_cast<T *>(QObject *object)
+ \relates QObject
+
+ Returns the given \a object cast to type T if the object is of type
+ T (or of a subclass); otherwise returns 0.
+
+ The class T must inherit (directly or indirectly) QObject and be
+ declared with the \l Q_OBJECT macro.
+
+ A class is considered to inherit itself.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 3
+
+ The qobject_cast() function behaves similarly to the standard C++
+ \c dynamic_cast(), with the advantages that it doesn't require
+ RTTI support and it works across dynamic library boundaries.
+
+ qobject_cast() can also be used in conjunction with interfaces;
+ see the \l{tools/plugandpaint}{Plug & Paint} example for details.
+
+ \warning If T isn't declared with the Q_OBJECT macro, this
+ function's return value is undefined.
+
+ \sa QObject::inherits()
+*/
+
+/*!
+ \fn bool QObject::inherits(const char *className) const
+
+ Returns true if this object is an instance of a class that
+ inherits \a className or a QObject subclass that inherits \a
+ className; otherwise returns false.
+
+ A class is considered to inherit itself.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 4
+
+ (\l QLayoutItem is not a QObject.)
+
+ Consider using qobject_cast<Type *>(object) instead. The method
+ is both faster and safer.
+
+ \sa metaObject(), qobject_cast()
+*/
+
+/*!
+ \property QObject::objectName
+
+ \brief the name of this object
+
+ You can find an object by name (and type) using findChild(). You can
+ find a set of objects with findChildren().
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 5
+
+ By default, this property contains an empty string.
+
+ \sa metaObject(), QMetaObject::className()
+*/
+
+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
+/*! \internal
+ QObject::child is compat but needs to call itself recursively,
+ that's why we need this helper.
+*/
+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;
+}
+
+
+/*!
+ Searches the children and optionally grandchildren of this object,
+ and returns a child that is called \a objName that inherits \a
+ inheritsClass. If \a inheritsClass is 0 (the default), any class
+ matches.
+
+ If \a recursiveSearch is true (the default), child() performs a
+ depth-first search of the object's children.
+
+ If there is no such object, this function returns 0. If there are
+ more than one, the first one found is returned.
+*/
+QObject* QObject::child(const char *objName, const char *inheritsClass,
+ bool recursiveSearch) const
+{
+ Q_D(const QObject);
+ return qChildHelper(objName, inheritsClass, recursiveSearch, d->children);
+}
+#endif
+
+/*!
+ \fn bool QObject::isWidgetType() const
+
+ Returns true if the object is a widget; otherwise returns false.
+
+ Calling this function is equivalent to calling
+ inherits("QWidget"), except that it is much faster.
+*/
+
+
+/*!
+ This virtual function receives events to an object and should
+ return true if the event \a e was recognized and processed.
+
+ The event() function can be reimplemented to customize the
+ behavior of an object.
+
+ \sa installEventFilter(), timerEvent(), QApplication::sendEvent(),
+ QApplication::postEvent(), QWidget::event()
+*/
+
+bool QObject::event(QEvent *e)
+{
+ switch (e->type()) {
+ case QEvent::Timer:
+ timerEvent((QTimerEvent*)e);
+ break;
+
+#ifdef QT3_SUPPORT
+ case QEvent::ChildInsertedRequest:
+ d_func()->sendPendingChildInsertedEvents();
+ break;
+#endif
+
+ case QEvent::ChildAdded:
+ case QEvent::ChildPolished:
+#ifdef QT3_SUPPORT
+ case QEvent::ChildInserted:
+#endif
+ case QEvent::ChildRemoved:
+ childEvent((QChildEvent*)e);
+ break;
+
+ case QEvent::DeferredDelete:
+ qDeleteInEventHandler(this);
+ break;
+
+ case QEvent::MetaCall:
+ {
+ d_func()->inEventHandler = false;
+ QMetaCallEvent *mce = static_cast<QMetaCallEvent*>(e);
+ QObjectPrivate::Sender currentSender;
+ currentSender.sender = const_cast<QObject*>(mce->sender());
+ currentSender.signal = mce->signalId();
+ currentSender.ref = 1;
+ QObjectPrivate::Sender * const previousSender =
+ QObjectPrivate::setCurrentSender(this, &currentSender);
+#if defined(QT_NO_EXCEPTIONS)
+ mce->placeMetaCall(this);
+#else
+ try {
+ mce->placeMetaCall(this);
+ } catch (...) {
+ QObjectPrivate::resetCurrentSender(this, &currentSender, previousSender);
+ throw;
+ }
+#endif
+ QObjectPrivate::resetCurrentSender(this, &currentSender, previousSender);
+ break;
+ }
+
+ case QEvent::ThreadChange: {
+ Q_D(QObject);
+ QThreadData *threadData = d->threadData;
+ QAbstractEventDispatcher *eventDispatcher = threadData->eventDispatcher;
+ if (eventDispatcher) {
+ // set inThreadChangeEvent to true to tell the dispatcher not to release out timer ids
+ // back to the pool (since the timer ids are moving to a new thread).
+ d->inThreadChangeEvent = true;
+ QList<QPair<int, int> > timers = eventDispatcher->registeredTimers(this);
+ d->inThreadChangeEvent = false;
+ 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;
+}
+
+/*!
+ \fn void QObject::timerEvent(QTimerEvent *event)
+
+ This event handler can be reimplemented in a subclass to receive
+ timer events for the object.
+
+ QTimer provides a higher-level interface to the timer
+ functionality, and also more general information about timers. The
+ timer event is passed in the \a event parameter.
+
+ \sa startTimer(), killTimer(), event()
+*/
+
+void QObject::timerEvent(QTimerEvent *)
+{
+}
+
+
+/*!
+ This event handler can be reimplemented in a subclass to receive
+ child events. The event is passed in the \a event parameter.
+
+ QEvent::ChildAdded and QEvent::ChildRemoved events are sent to
+ objects when children are added or removed. In both cases you can
+ only rely on the child being a QObject, or if isWidgetType()
+ returns true, a QWidget. (This is because, in the
+ \l{QEvent::ChildAdded}{ChildAdded} case, the child is not yet
+ fully constructed, and in the \l{QEvent::ChildRemoved}{ChildRemoved}
+ case it might have been destructed already).
+
+ QEvent::ChildPolished events are sent to widgets when children
+ are polished, or when polished children are added. If you receive
+ a child polished event, the child's construction is usually
+ completed. However, this is not guaranteed, and multiple polish
+ events may be delivered during the execution of a widget's
+ constructor.
+
+ For every child widget, you receive one
+ \l{QEvent::ChildAdded}{ChildAdded} event, zero or more
+ \l{QEvent::ChildPolished}{ChildPolished} events, and one
+ \l{QEvent::ChildRemoved}{ChildRemoved} event.
+
+ The \l{QEvent::ChildPolished}{ChildPolished} event is omitted if
+ a child is removed immediately after it is added. If a child is
+ polished several times during construction and destruction, you
+ may receive several child polished events for the same child,
+ each time with a different virtual table.
+
+ \sa event()
+*/
+
+void QObject::childEvent(QChildEvent * /* event */)
+{
+}
+
+
+/*!
+ This event handler can be reimplemented in a subclass to receive
+ custom events. Custom events are user-defined events with a type
+ value at least as large as the QEvent::User item of the
+ QEvent::Type enum, and is typically a QEvent subclass. The event
+ is passed in the \a event parameter.
+
+ \sa event(), QEvent
+*/
+void QObject::customEvent(QEvent * /* event */)
+{
+}
+
+
+
+/*!
+ Filters events if this object has been installed as an event
+ filter for the \a watched object.
+
+ In your reimplementation of this function, if you want to filter
+ the \a event out, i.e. stop it being handled further, return
+ true; otherwise return false.
+
+ Example:
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 6
+
+ Notice in the example above that unhandled events are passed to
+ the base class's eventFilter() function, since the base class
+ might have reimplemented eventFilter() for its own internal
+ purposes.
+
+ \warning If you delete the receiver object in this function, be
+ sure to return true. Otherwise, Qt will forward the event to the
+ deleted object and the program might crash.
+
+ \sa installEventFilter()
+*/
+
+bool QObject::eventFilter(QObject * /* watched */, QEvent * /* event */)
+{
+ return false;
+}
+
+/*!
+ \fn bool QObject::signalsBlocked() const
+
+ Returns true if signals are blocked; otherwise returns false.
+
+ Signals are not blocked by default.
+
+ \sa blockSignals()
+*/
+
+/*!
+ If \a block is true, signals emitted by this object are blocked
+ (i.e., emitting a signal will not invoke anything connected to it).
+ If \a block is false, no such blocking will occur.
+
+ The return value is the previous value of signalsBlocked().
+
+ Note that the destroyed() signal will be emitted even if the signals
+ for this object have been blocked.
+
+ \sa signalsBlocked()
+*/
+
+bool QObject::blockSignals(bool block)
+{
+ Q_D(QObject);
+ bool previous = d->blockSig;
+ d->blockSig = block;
+ return previous;
+}
+
+/*!
+ Returns the thread in which the object lives.
+
+ \sa moveToThread()
+*/
+QThread *QObject::thread() const
+{
+ return d_func()->threadData->thread;
+}
+
+/*!
+ Changes the thread affinity for this object and its children. The
+ object cannot be moved if it has a parent. Event processing will
+ continue in the \a targetThread.
+
+ To move an object to the main thread, use QApplication::instance()
+ to retrieve a pointer to the current application, and then use
+ QApplication::thread() to retrieve the thread in which the
+ application lives. For example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 7
+
+ If \a targetThread is zero, all event processing for this object
+ and its children stops.
+
+ Note that all active timers for the object will be reset. The
+ timers are first stopped in the current thread and restarted (with
+ the same interval) in the \a targetThread. As a result, constantly
+ moving an object between threads can postpone timer events
+ indefinitely.
+
+ A QEvent::ThreadChange event is sent to this object just before
+ the thread affinity is changed. You can handle this event to
+ perform any special processing. Note that any new events that are
+ posted to this object will be handled in the \a targetThread.
+
+ \warning This function is \e not thread-safe; the current thread
+ must be same as the current thread affinity. In other words, this
+ function can only "push" an object from the current thread to
+ another thread, it cannot "pull" an object from any arbitrary
+ thread to the current thread.
+
+ \sa 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);
+
+#ifdef Q_WS_MAC
+ qWarning("On Mac OS X, you might be loading two sets of Qt binaries into the same process. "
+ "Check that all plugins are compiled against the right Qt binaries. Export "
+ "DYLD_PRINT_LIBRARIES=1 and check that only one set of binaries are being loaded.");
+#endif
+
+ return;
+ }
+
+ // prepare to move
+ d->moveToThread_helper();
+
+ QOrderedMutexLocker locker(&currentData->postEventList.mutex,
+ &targetData->postEventList.mutex);
+
+ // keep currentData alive (since we've got it locked)
+ currentData->ref();
+
+ // move the object
+ d_func()->setThreadData_helper(currentData, targetData);
+
+ locker.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();
+
+ // the current emitting thread shouldn't restore currentSender after calling moveToThread()
+ if (currentSender)
+ currentSender->ref = 0;
+ currentSender = 0;
+
+ // the current event thread also shouldn't restore the delete watch
+ inEventHandler = false;
+ if (deleteWatch)
+ *deleteWatch = 1;
+ deleteWatch = 0;
+
+ // 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.
+//
+
+/*!
+ Starts a timer and returns a timer identifier, or returns zero if
+ it could not start a timer.
+
+ A timer event will occur every \a interval milliseconds until
+ killTimer() is called. If \a interval is 0, then the timer event
+ occurs once every time there are no more window system events to
+ process.
+
+ The virtual timerEvent() function is called with the QTimerEvent
+ event parameter class when a timer event occurs. Reimplement this
+ function to get timer events.
+
+ If multiple timers are running, the QTimerEvent::timerId() can be
+ used to find out which timer was activated.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 8
+
+ Note that QTimer's accuracy depends on the underlying operating
+ system and hardware. Most platforms support an accuracy of 20
+ milliseconds; some provide more. If Qt is unable to deliver the
+ requested number of timer events, it will silently discard some.
+
+ The QTimer class provides a high-level programming interface with
+ single-shot timers and timer signals instead of events. There is
+ also a QBasicTimer class that is more lightweight than QTimer and
+ less clumsy than using timer IDs directly.
+
+ \sa timerEvent(), killTimer(), QTimer::singleShot()
+*/
+
+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);
+}
+
+/*!
+ Kills the timer with timer identifier, \a id.
+
+ The timer identifier is returned by startTimer() when a timer
+ event is started.
+
+ \sa timerEvent(), startTimer()
+*/
+
+void QObject::killTimer(int id)
+{
+ Q_D(QObject);
+ if (d->threadData->eventDispatcher)
+ d->threadData->eventDispatcher->unregisterTimer(id);
+}
+
+
+/*!
+ \fn QObject *QObject::parent() const
+
+ Returns a pointer to the parent object.
+
+ \sa children()
+*/
+
+/*!
+ \fn const QObjectList &QObject::children() const
+
+ Returns a list of child objects.
+ The QObjectList class is defined in the \c{<QObject>} header
+ file as the following:
+
+ \quotefromfile src/corelib/kernel/qobject.h
+ \skipto /typedef .*QObjectList/
+ \printuntil QObjectList
+
+ The first child added is the \l{QList::first()}{first} object in
+ the list and the last child added is the \l{QList::last()}{last}
+ object in the list, i.e. new children are appended at the end.
+
+ Note that the list order changes when QWidget children are
+ \l{QWidget::raise()}{raised} or \l{QWidget::lower()}{lowered}. A
+ widget that is raised becomes the last object in the list, and a
+ widget that is lowered becomes the first object in the list.
+
+ \sa findChild(), findChildren(), parent(), setParent()
+*/
+
+#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);
+ if (!obj)
+ continue;
+ 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);
+ }
+ }
+}
+
+/*!
+ \internal
+
+ Searches the children and optionally grandchildren of this object,
+ and returns a list of those objects that are named or that match
+ \a objName and inherit \a inheritsClass. If \a inheritsClass is 0
+ (the default), all classes match. If \a objName is 0 (the
+ default), all object names match.
+
+ If \a regexpMatch is true (the default), \a objName is a regular
+ expression that the objects's names must match. The syntax is that
+ of a QRegExp. If \a regexpMatch is false, \a objName is a string
+ and object names must match it exactly.
+
+ Note that \a inheritsClass uses single inheritance from QObject,
+ the way inherits() does. According to inherits(), QWidget
+ inherits QObject but not QPaintDevice. This does not quite match
+ reality, but is the best that can be done on the wide variety of
+ compilers Qt supports.
+
+ Finally, if \a recursiveSearch is true (the default), queryList()
+ searches \e{n}th-generation as well as first-generation children.
+
+ If all this seems a bit complex for your needs, the simpler
+ child() function may be what you want.
+
+ This somewhat contrived example disables all the buttons in this
+ window:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 9
+
+ \warning Delete the list as soon you have finished using it. The
+ list contains pointers that may become invalid at almost any time
+ without notice (as soon as the user closes a window you may have
+ dangling pointers, for example).
+
+ \sa child() children(), parent(), inherits(), objectName(), QRegExp
+*/
+
+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
+
+/*!
+ \fn T *QObject::findChild(const QString &name) const
+
+ Returns the child of this object that can be cast into type T and
+ that is called \a name, or 0 if there is no such object.
+ Omitting the \a name argument causes all object names to be matched.
+ The search is performed recursively.
+
+ If there is more than one child matching the search, the most
+ direct ancestor is returned. If there are several direct
+ ancestors, it is undefined which one will be returned. In that
+ case, findChildren() should be used.
+
+ This example returns a child \l{QPushButton} of \c{parentWidget}
+ named \c{"button1"}:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 10
+
+ This example returns a \l{QListWidget} child of \c{parentWidget}:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 11
+
+ \warning This function is not available with MSVC 6. Use
+ qFindChild() instead if you need to support that version of the
+ compiler.
+
+ \sa findChildren(), qFindChild()
+*/
+
+/*!
+ \fn QList<T> QObject::findChildren(const QString &name) const
+
+ Returns all children of this object with the given \a name that can be
+ cast to type T, or an empty list if there are no such objects.
+ Omitting the \a name argument causes all object names to be matched.
+ The search is performed recursively.
+
+ The following example shows how to find a list of child \l{QWidget}s of
+ the specified \c{parentWidget} named \c{widgetname}:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 12
+
+ This example returns all \c{QPushButton}s that are children of \c{parentWidget}:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 13
+
+ \warning This function is not available with MSVC 6. Use
+ qFindChildren() instead if you need to support that version of the
+ compiler.
+
+ \sa findChild(), qFindChildren()
+*/
+
+/*!
+ \fn QList<T> QObject::findChildren(const QRegExp &regExp) const
+ \overload findChildren()
+
+ Returns the children of this object that can be cast to type T
+ and that have names matching the regular expression \a regExp,
+ or an empty list if there are no such objects.
+ The search is performed recursively.
+
+ \warning This function is not available with MSVC 6. Use
+ qFindChildren() instead if you need to support that version of the
+ compiler.
+*/
+
+/*!
+ \fn T qFindChild(const QObject *obj, const QString &name)
+ \relates QObject
+
+ This function is equivalent to
+ \a{obj}->\l{QObject::findChild()}{findChild}<T>(\a name). It is
+ provided as a work-around for MSVC 6, which doesn't support
+ member template functions.
+
+ \sa QObject::findChild()
+*/
+
+/*!
+ \fn QList<T> qFindChildren(const QObject *obj, const QString &name)
+ \relates QObject
+
+ This function is equivalent to
+ \a{obj}->\l{QObject::findChildren()}{findChildren}<T>(\a name). It is
+ provided as a work-around for MSVC 6, which doesn't support
+ member template functions.
+
+ \sa QObject::findChildren()
+*/
+
+/*!
+ \fn QList<T> qFindChildren(const QObject *obj, const QRegExp &regExp)
+ \relates QObject
+ \overload qFindChildren()
+
+ This function is equivalent to
+ \a{obj}->\l{QObject::findChildren()}{findChildren}<T>(\a regExp). It is
+ provided as a work-around for MSVC 6, which doesn't support
+ member template functions.
+*/
+
+/*!
+ \internal
+ \fn T qFindChild(const QObject *obj, const QString &name = QString(), T dummy = 0)
+ \relates QObject
+ \overload qFindChildren()
+
+ This function is equivalent to
+ \a{obj}->\l{QObject::findChild()}{findChild}<T>(\a name). It is
+ provided as a work-around for MSVC 6, which doesn't support
+ member template functions.
+
+ \sa QObject::findChild()
+*/
+
+/*!
+ \internal
+ \fn QList<T> qFindChildren(const QObject *obj, const QString &name = QString(), T dummy = 0)
+ \relates QObject
+ \overload qFindChildren()
+
+ This function is equivalent to
+ \a{obj}->\l{QObject::findChildren()}{findChildren}<T>(\a name). It is
+ provided as a work-around for MSVC 6, which doesn't support
+ member template functions.
+
+ \sa QObject::findChildren()
+*/
+
+/*!
+ \internal
+*/
+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);
+ }
+}
+
+/*! \internal
+ */
+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;
+}
+
+/*!
+ Makes the object a child of \a parent.
+
+ \sa QWidget::setParent()
+*/
+
+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: Cannot set parent, new parent is in a different thread");
+ 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
+ if (parent->d_func()->pendingChildInsertedEvents.isEmpty()) {
+ QCoreApplication::postEvent(parent,
+ new QEvent(QEvent::ChildInsertedRequest),
+ Qt::HighEventPriority);
+ }
+ parent->d_func()->pendingChildInsertedEvents.append(q);
+#endif
+ }
+ }
+ }
+}
+
+/*!
+ \fn void QObject::installEventFilter(QObject *filterObj)
+
+ Installs an event filter \a filterObj on this object. For example:
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 14
+
+ An event filter is an object that receives all events that are
+ sent to this object. The filter can either stop the event or
+ forward it to this object. The event filter \a filterObj receives
+ events via its eventFilter() function. The eventFilter() function
+ must return true if the event should be filtered, (i.e. stopped);
+ otherwise it must return false.
+
+ If multiple event filters are installed on a single object, the
+ filter that was installed last is activated first.
+
+ Here's a \c KeyPressEater class that eats the key presses of its
+ monitored objects:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 15
+
+ And here's how to install it on two widgets:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 16
+
+ The QShortcut class, for example, uses this technique to intercept
+ shortcut key presses.
+
+ \warning If you delete the receiver object in your eventFilter()
+ function, be sure to return true. If you return false, Qt sends
+ the event to the deleted object and the program will crash.
+
+ Note that the filtering object must be in the same thread as this
+ object. If \a filterObj is in a different thread, this function does
+ nothing. If either \a filterObj or this object are moved to a different
+ thread after calling this function, the event filter will not be
+ called until both objects have the same thread affinity again (it
+ is \e not removed).
+
+ \sa removeEventFilter(), eventFilter(), event()
+*/
+
+void QObject::installEventFilter(QObject *obj)
+{
+ Q_D(QObject);
+ if (!obj)
+ return;
+ if (d->threadData != obj->d_func()->threadData) {
+ qWarning("QObject::installEventFilter(): Cannot filter events for objects in a different thread.");
+ return;
+ }
+
+ // clean up unused items in the list
+ d->eventFilters.removeAll((QObject*)0);
+ d->eventFilters.removeAll(obj);
+ d->eventFilters.prepend(obj);
+}
+
+/*!
+ Removes an event filter object \a obj from this object. The
+ request is ignored if such an event filter has not been installed.
+
+ All event filters for this object are automatically removed when
+ this object is destroyed.
+
+ It is always safe to remove an event filter, even during event
+ filter activation (i.e. from the eventFilter() function).
+
+ \sa installEventFilter(), eventFilter(), event()
+*/
+
+void QObject::removeEventFilter(QObject *obj)
+{
+ Q_D(QObject);
+ for (int i = 0; i < d->eventFilters.count(); ++i) {
+ if (d->eventFilters.at(i) == obj)
+ d->eventFilters[i] = 0;
+ }
+}
+
+
+/*!
+ \fn QObject::destroyed(QObject *obj)
+
+ This signal is emitted immediately before the object \a obj is
+ destroyed, and can not be blocked.
+
+ All the objects's children are destroyed immediately after this
+ signal is emitted.
+
+ \sa deleteLater(), QPointer
+*/
+
+/*!
+ Schedules this object for deletion.
+
+ The object will be deleted when control returns to the event
+ loop. If the event loop is not running when this function is
+ called (e.g. deleteLater() is called on an object before
+ QCoreApplication::exec()), the object will be deleted once the
+ event loop is started.
+
+ Note that entering and leaving a new event loop (e.g., by opening a modal
+ dialog) will \e not perform the deferred deletion; for the object to be
+ deleted, the control must return to the event loop from which
+ deleteLater() was called.
+
+ \bold{Note:} It is safe to call this function more than once; when the
+ first deferred deletion event is delivered, any pending events for the
+ object are removed from the event queue.
+
+ \sa destroyed(), QPointer
+*/
+void QObject::deleteLater()
+{
+ QCoreApplication::postEvent(this, new QEvent(QEvent::DeferredDelete));
+}
+
+/*!
+ \fn QString QObject::tr(const char *sourceText, const char *disambiguation, int n)
+ \reentrant
+
+ Returns a translated version of \a sourceText, optionally based on a
+ \a disambiguation string and value of \a n for strings containing plurals;
+ otherwise returns \a sourceText itself if no appropriate translated string
+ is available.
+
+ See the sections below on Disambiguation and Handling Plurals for more
+ information about the optional \a disambiguation and \a n parameters.
+
+ QObject and its subclasses obtain translated strings from any translator
+ objects that have been installed on the application object; see the
+ QTranslator documentation for details about this mechanism.
+
+ A translatable string is referenced by its translation context;
+ this is the name of the QObject subclass whose tr() function is invoked,
+ as in the following example:
+
+ \snippet mainwindows/sdi/mainwindow.cpp implicit tr context
+ \dots
+
+ Here, the context is \c MainWindow because it is the \c MainWindow::tr()
+ function that is invoked. Translation contexts can be given explicitly
+ by fully qualifying the call to tr(); for example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp explicit tr context
+
+ This call obtains the translated text for "Page up" from the \c QScrollBar
+ context.
+
+ \section1 Defining Translation Contexts
+
+ The translation context for QObject and each QObject subclass is the
+ class name itself. Developers subclassing QObject must use the
+ Q_OBJECT macro in their class definition to override the translation
+ context. This macro sets the context to the name of the subclass.
+
+ If Q_OBJECT is not used in a class definition, the context will be
+ inherited from the base class. For example, since all QObject-based
+ classes in Qt provide a context, a new QWidget subclass defined without
+ a Q_OBJECT macro will use the "QWidget" context if its tr() function
+ is invoked.
+
+ \section1 Translator Comments
+
+ Developers can include information about each translatable string to
+ help translators with the translation process. These are extracted
+ when \l lupdate is used to process the source files. The recommended
+ way to add comments is to annotate the tr() calls in your code with
+ comments of the form:
+
+ \tt{//: ...}
+
+ or
+
+ \tt{/*: ... \starslash}
+
+ Examples:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 40
+
+ In these examples, the comments will be associated with the strings
+ passed to tr() in the context of each call.
+
+ \section1 Disambiguation
+
+ If the same \a sourceText is used in different roles within the
+ same context, an additional identifying string may be passed in
+ \a disambiguation (0 by default). In Qt 4.4 and earlier, this was
+ the preferred way to pass comments to translators.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 17
+
+ \section1 Character Encodings
+
+ You can set the encoding for \a sourceText by calling QTextCodec::setCodecForTr().
+ By default \a sourceText is assumed to be in Latin-1 encoding.
+
+ \section1 Handling Plurals
+
+ If \a n >= 0, all occurrences of \c %n in the resulting string
+ are replaced with a decimal representation of \a n. In addition,
+ depending on \a n's value, the translation text may vary.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 18
+
+ The table below shows what string is returned depending on the
+ active translation:
+
+ \table
+ \header \o \o{3,1} Active Translation
+ \header \o \a n \o No Translation \o French \o English
+ \row \o 0 \o "0 message(s) saved" \o "0 message sauvegard\unicode{0xE9}" \o "0 message\bold{s} saved"
+ \row \o 1 \o "1 message(s) saved" \o "1 message sauvegard\unicode{0xE9}" \o "1 message saved"
+ \row \o 2 \o "2 message(s) saved" \o "2 message\bold{s} sauvegard\unicode{0xE9}\bold{s}" \o "2 message\bold{s} saved"
+ \row \o 37 \o "37 message(s) saved" \o "37 message\bold{s} sauvegard\unicode{0xE9}\bold{s}" \o "37 message\bold{s} saved"
+ \endtable
+
+ This idiom is more flexible than the traditional approach; e.g.,
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 19
+
+ because it also works with target languages that have several
+ plural forms (e.g., Irish has a special "dual" form that should
+ be used when \c n is 2), and it handles the \e n == 0 case
+ correctly for languages such as French that require the singular.
+ See the \l{Qt Linguist Manual} for details.
+
+ Instead of \c %n, you can use \c %Ln to produce a localized
+ representation of \a n. The conversion uses the default locale,
+ set using QLocale::setDefault(). (If no default locale was
+ specified, the "C" locale is used.)
+
+ \warning This method is reentrant only if all translators are
+ installed \e before calling this method. Installing or removing
+ translators while performing translations is not supported. Doing
+ so will probably result in crashes or other undesirable behavior.
+
+ \sa trUtf8(), QApplication::translate(), QTextCodec::setCodecForTr(), {Internationalization with Qt}
+*/
+
+/*!
+ \fn QString QObject::trUtf8(const char *sourceText, const char *disambiguation, int n)
+ \reentrant
+
+ Returns a translated version of \a sourceText, or
+ QString::fromUtf8(\a sourceText) if there is no appropriate
+ version. It is otherwise identical to tr(\a sourceText, \a
+ disambiguation, \a n).
+
+ Note that using the Utf8 variants of the translation functions
+ is not required if \c CODECFORTR is already set to UTF-8 in the
+ qmake project file and QTextCodec::setCodecForTr("UTF-8") is
+ used.
+
+ \warning This method is reentrant only if all translators are
+ installed \e before calling this method. Installing or removing
+ translators while performing translations is not supported. Doing
+ so will probably result in crashes or other undesirable behavior.
+
+ \warning For portability reasons, we recommend that you use
+ escape sequences for specifying non-ASCII characters in string
+ literals to trUtf8(). For example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 20
+
+ \sa tr(), QApplication::translate(), {Internationalization with Qt}
+*/
+
+
+
+
+/*****************************************************************************
+ Signals and slots
+ *****************************************************************************/
+
+
+const int flagged_locations_count = 2;
+static const char* flagged_locations[flagged_locations_count] = {0};
+
+const char *qFlagLocation(const char *method)
+{
+ static int idx = 0;
+ flagged_locations[idx] = method;
+ idx = (idx+1) % flagged_locations_count;
+ return method;
+}
+
+static int extract_code(const char *member)
+{
+ // extract code, ensure QMETHOD_CODE <= code <= QSIGNAL_CODE
+ return (((int)(*member) - '0') & 0x3);
+}
+
+static const char * extract_location(const char *member)
+{
+ for (int i = 0; i < flagged_locations_count; ++i) {
+ if (member == flagged_locations[i]) {
+ // signature includes location information after the first null-terminator
+ const char *location = member + qstrlen(member) + 1;
+ if (*location != '\0')
+ return location;
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static bool check_signal_macro(const QObject *sender, const char *signal,
+ const char *func, const char *op)
+{
+ int sigcode = extract_code(signal);
+ 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(const QObject *object,
+ const char *method, const char *func)
+{
+ const char *type = "method";
+ switch (extract_code(method)) {
+ case QSLOT_CODE: type = "slot"; break;
+ case QSIGNAL_CODE: type = "signal"; break;
+ }
+ const char *loc = extract_location(method);
+ if (strchr(method,')') == 0) // common typing mistake
+ qWarning("Object::%s: Parentheses expected, %s %s::%s%s%s",
+ func, type, object->metaObject()->className(), method+1,
+ loc ? " in ":"\0", loc ? loc : "\0");
+ else
+ qWarning("Object::%s: No such %s %s::%s%s%s",
+ func, type, object->metaObject()->className(), method+1,
+ loc ? " in ":"\0", loc ? loc : "\0");
+
+}
+
+
+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());
+}
+
+/*!
+ Returns a pointer to the object that sent the signal, if called in
+ a slot activated by a signal; otherwise it returns 0. The pointer
+ is valid only during the execution of the slot that calls this
+ function from this object's thread context.
+
+ The pointer returned by this function becomes invalid if the
+ sender is destroyed, or if the slot is disconnected from the
+ sender's signal.
+
+ \warning This function violates the object-oriented principle of
+ modularity. However, getting access to the sender might be useful
+ when many signals are connected to a single slot.
+
+ \warning As mentioned above, the return value of this function is
+ not valid when the slot is called via a Qt::DirectConnection from
+ a thread different from this object's thread. Do not use this
+ function in this type of scenario.
+
+ \sa QSignalMapper
+*/
+
+QObject *QObject::sender() const
+{
+ Q_D(const QObject);
+
+ QMutexLocker(&d->threadData->mutex);
+ if (!d->currentSender)
+ return 0;
+
+ // Return 0 if d->currentSender isn't in d->senders
+ bool found = false;
+ for (int i = 0; !found && i < d->senders.count(); ++i)
+ found = (d->senders.at(i).sender == d->currentSender->sender);
+ if (!found)
+ return 0;
+ return d->currentSender->sender;
+}
+
+/*!
+ Returns the number of receivers connected to the \a signal.
+
+ Since both slots and signals can be used as receivers for signals,
+ and the same connections can be made many times, the number of
+ receivers is the same as the number of connections made from this
+ signal.
+
+ When calling this function, you can use the \c SIGNAL() macro to
+ pass a specific signal:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 21
+
+ As the code snippet above illustrates, you can use this function
+ to avoid emitting a signal that nobody listens to.
+
+ \warning This function violates the object-oriented principle of
+ modularity. However, it might be useful when you need to perform
+ expensive initialization only if something is connected to a
+ signal.
+*/
+
+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(this, signal-1, "receivers");
+#endif
+ return false;
+ }
+
+ Q_D(const QObject);
+ QMutexLocker locker(&d->threadData->mutex);
+ if (d->connectionLists) {
+ if (signal_index < d->connectionLists->count()) {
+ const QObjectPrivate::ConnectionList &connectionList =
+ d->connectionLists->at(signal_index);
+ for (int i = 0; i < connectionList.count(); ++i) {
+ const QObjectPrivate::Connection &c = connectionList.at(i);
+ receivers += c.receiver ? 1 : 0;
+ }
+ }
+ }
+ }
+ return receivers;
+}
+
+/*!
+ \threadsafe
+
+ Creates a connection of the given \a type from the \a signal in
+ the \a sender object to the \a method in the \a receiver object.
+ Returns true if the connection succeeds; otherwise returns false.
+
+ You must use the \c SIGNAL() and \c SLOT() macros when specifying
+ the \a signal and the \a method, for example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 22
+
+ This example ensures that the label always displays the current
+ scroll bar value. Note that the signal and slots parameters must not
+ contain any variable names, only the type. E.g. the following would
+ not work and return false:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 23
+
+ A signal can also be connected to another signal:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 24
+
+ In this example, the \c MyWidget constructor relays a signal from
+ a private member variable, and makes it available under a name
+ that relates to \c MyWidget.
+
+ A signal can be connected to many slots and signals. Many signals
+ can be connected to one slot.
+
+ If a signal is connected to several slots, the slots are activated
+ in an arbitrary order when the signal is emitted.
+
+ The function returns true if it successfully connects the signal
+ to the slot. It will return false if it cannot create the
+ connection, for example, if QObject is unable to verify the
+ existence of either \a signal or \a method, or if their signatures
+ aren't compatible.
+
+ For every connection you make, a signal is emitted; two signals are emitted
+ for duplicate connections. You can break all of these connections with a
+ single disconnect() call.
+
+ The optional \a type parameter describes the type of connection
+ to establish. In particular, it determines whether a particular
+ signal is delivered to a slot immediately or queued for delivery
+ at a later time. If the signal is queued, the parameters must be
+ of types that are known to Qt's meta-object system, because Qt
+ needs to copy the arguments to store them in an event behind the
+ scenes. If you try to use a queued connection and get the error
+ message
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 25
+
+ call qRegisterMetaType() to register the data type before you
+ establish the connection.
+
+ \sa disconnect(), sender(), qRegisterMetaType()
+*/
+
+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();
+ const char *signal_arg = signal;
+ ++signal; //skip code
+ int signal_index = smeta->indexOfSignal(signal);
+ if (signal_index < 0) {
+ // check for normalized signatures
+ tmp_signal_name = QMetaObject::normalizedSignature(signal - 1);
+ signal = tmp_signal_name.constData() + 1;
+
+ signal_index = smeta->indexOfSignal(signal);
+ if (signal_index < 0) {
+ err_method_notfound(sender, signal_arg, "connect");
+ err_info_about_objects("connect", sender, receiver);
+ return false;
+ }
+ }
+
+ QByteArray tmp_method_name;
+ int membcode = extract_code(method);
+
+ if (!check_method_code(membcode, receiver, method, "connect"))
+ return false;
+ const char *method_arg = method;
+ ++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(receiver, method_arg, "connect");
+ err_info_about_objects("connect", sender, receiver);
+ return false;
+ }
+ if (!QMetaObject::checkConnectArgs(signal, method)) {
+ qWarning("QObject::connect: Incompatible sender/receiver arguments"
+ "\n %s::%s --> %s::%s",
+ sender->metaObject()->className(), signal,
+ receiver->metaObject()->className(), method);
+ return false;
+ }
+
+ int *types = 0;
+ if ((type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
+ && !(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;
+}
+
+
+/*!
+ \fn bool QObject::connect(const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const
+ \overload connect()
+ \threadsafe
+
+ Connects \a signal from the \a sender object to this object's \a
+ method.
+
+ Equivalent to connect(\a sender, \a signal, \c this, \a method, \a type).
+
+ Every connection you make emits a signal, so duplicate connections emit
+ two signals. You can break a connection using disconnect().
+
+ \sa disconnect()
+*/
+
+/*!
+ \threadsafe
+
+ Disconnects \a signal in object \a sender from \a method in object
+ \a receiver. Returns true if the connection is successfully broken;
+ otherwise returns false.
+
+ A signal-slot connection is removed when either of the objects
+ involved are destroyed.
+
+ disconnect() is typically used in three ways, as the following
+ examples demonstrate.
+ \list 1
+ \i Disconnect everything connected to an object's signals:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 26
+
+ equivalent to the non-static overloaded function
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 27
+
+ \i Disconnect everything connected to a specific signal:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 28
+
+ equivalent to the non-static overloaded function
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 29
+
+ \i Disconnect a specific receiver:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 30
+
+ equivalent to the non-static overloaded function
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 31
+
+ \endlist
+
+ 0 may be used as a wildcard, meaning "any signal", "any receiving
+ object", or "any slot in the receiving object", respectively.
+
+ The \a sender may never be 0. (You cannot disconnect signals from
+ more than one object in a single call.)
+
+ If \a signal is 0, it disconnects \a receiver and \a method from
+ any signal. If not, only the specified signal is disconnected.
+
+ If \a receiver is 0, it disconnects anything connected to \a
+ signal. If not, slots in objects other than \a receiver are not
+ disconnected.
+
+ If \a method is 0, it disconnects anything that is connected to \a
+ receiver. If not, only slots named \a method will be disconnected,
+ and all other slots are left alone. The \a method must be 0 if \a
+ receiver is left out, so you cannot disconnect a
+ specifically-named slot on all objects.
+
+ \sa connect()
+*/
+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;
+ }
+
+ const char *signal_arg = signal;
+ 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;
+ const char *method_arg = method;
+ int membcode = -1;
+ bool method_found = false;
+ if (method) {
+ method_name = QMetaObject::normalizedSignature(method);
+ method = method_name;
+ membcode = extract_code(method);
+ 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(sender, signal_arg, "disconnect");
+ err_info_about_objects("disconnect", sender, receiver);
+ } else if (method && !method_found) {
+ err_method_notfound(receiver, method_arg, "disconnect");
+ err_info_about_objects("disconnect", sender, receiver);
+ }
+ if (res)
+ const_cast<QObject*>(sender)->disconnectNotify(signal ? (signal - 1) : 0);
+ return res;
+}
+
+
+/*!
+ \threadsafe
+
+ \fn bool QObject::disconnect(const char *signal, const QObject *receiver, const char *method)
+ \overload disconnect()
+
+ Disconnects \a signal from \a method of \a receiver.
+
+ A signal-slot connection is removed when either of the objects
+ involved are destroyed.
+*/
+
+/*!
+ \fn bool QObject::disconnect(const QObject *receiver, const char *method)
+ \overload disconnect()
+
+ Disconnects all signals in this object from \a receiver's \a
+ method.
+
+ A signal-slot connection is removed when either of the objects
+ involved are destroyed.
+*/
+
+
+/*!
+ \fn void QObject::connectNotify(const char *signal)
+
+ This virtual function is called when something has been connected
+ to \a signal in this object.
+
+ If you want to compare \a signal with a specific signal, use
+ QLatin1String and the \c SIGNAL() macro as follows:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 32
+
+ If the signal contains multiple parameters or parameters that
+ contain spaces, call QMetaObject::normalizedSignature() on
+ the result of the \c SIGNAL() macro.
+
+ \warning This function violates the object-oriented principle of
+ modularity. However, it might be useful when you need to perform
+ expensive initialization only if something is connected to a
+ signal.
+
+ \sa connect(), disconnectNotify()
+*/
+
+void QObject::connectNotify(const char *)
+{
+}
+
+/*!
+ \fn void QObject::disconnectNotify(const char *signal)
+
+ This virtual function is called when something has been
+ disconnected from \a signal in this object.
+
+ See connectNotify() for an example of how to compare
+ \a signal with a specific signal.
+
+ \warning This function violates the object-oriented principle of
+ modularity. However, it might be useful for optimizing access to
+ expensive resources.
+
+ \sa disconnect(), connectNotify()
+*/
+
+void QObject::disconnectNotify(const char *)
+{
+}
+
+/*!\internal
+
+ \a types is a 0-terminated vector of meta types for queued
+ connections.
+
+ if \a signal_index is -1, then we effectively connect *all* signals
+ from the sender to the receiver's slot
+*/
+bool QMetaObject::connect(const QObject *sender, int signal_index,
+ const QObject *receiver, int method_index, int type, int *types)
+{
+ QObject *s = const_cast<QObject *>(sender);
+ QObject *r = const_cast<QObject *>(receiver);
+
+ QOrderedMutexLocker locker(&s->d_func()->threadData->mutex,
+ &r->d_func()->threadData->mutex);
+
+#if defined(Q_CC_HPACC) && defined(QT_ARCH_PARISC)
+ QObjectPrivate::Connection c;
+ c.receiver = r;
+ c.method = method_index;
+ c.connectionType = type;
+ c.argumentTypes = types;
+#else
+ QObjectPrivate::Connection c = { r, method_index, type, Q_BASIC_ATOMIC_INITIALIZER(types) };
+#endif
+ s->d_func()->addConnection(signal_index, &c);
+ r->d_func()->refSender(s, signal_index);
+
+ if (signal_index < 0)
+ sender->d_func()->connectedSignals = ~0u;
+ else if (signal_index < 32)
+ sender->d_func()->connectedSignals |= (1 << signal_index);
+
+ return true;
+}
+
+
+/*!\internal
+ */
+bool QMetaObject::disconnect(const QObject *sender, int signal_index,
+ const QObject *receiver, int method_index)
+{
+ if (!sender)
+ return false;
+
+ QObject *s = const_cast<QObject *>(sender);
+ QObject *r = const_cast<QObject *>(receiver);
+
+ QMutex *senderMutex = &s->d_func()->threadData->mutex;
+ QMutex *receiverMutex = r ? &r->d_func()->threadData->mutex : 0;
+ QOrderedMutexLocker locker(senderMutex, receiverMutex);
+
+ QObjectConnectionListVector *connectionLists = s->d_func()->connectionLists;
+ if (!connectionLists)
+ return false;
+
+ // prevent incoming connections changing the connectionLists while unlocked
+ ++connectionLists->inUse;
+
+ bool success = false;
+ if (signal_index < 0) {
+ // remove from all connection lists
+ for (signal_index = -1; signal_index < connectionLists->count(); ++signal_index) {
+ QObjectPrivate::ConnectionList &connectionList = (*connectionLists)[signal_index];
+ for (int i = 0; i < connectionList.count(); ++i) {
+ QObjectPrivate::Connection *c = &connectionList[i];
+ if (c->receiver
+ && (r == 0 || (c->receiver == r
+ && (method_index < 0 || c->method == method_index)))) {
+ QMutex *m = &c->receiver->d_func()->threadData->mutex;
+ if (!receiverMutex && senderMutex != m) {
+ // need to relock this receiver and sender in the correct order
+ bool needToUnlock = QOrderedMutexLocker::relock(senderMutex, m);
+ c = &connectionList[i];
+ if (c->receiver)
+ c->receiver->d_func()->derefSender(s, signal_index);
+ if (needToUnlock)
+ m->unlock();
+ } else {
+ // no need to unlock
+ c->receiver->d_func()->derefSender(s, signal_index);
+ }
+ if (c->argumentTypes && c->argumentTypes != &DIRECT_CONNECTION_ONLY) {
+ qFree(c->argumentTypes);
+ c->argumentTypes = 0;
+ }
+ c->receiver = 0;
+
+ success = true;
+ connectionLists->dirty = true;
+ }
+ }
+ }
+ } else if (signal_index < connectionLists->count()) {
+ QObjectPrivate::ConnectionList &connectionList = (*connectionLists)[signal_index];
+ for (int i = 0; i < connectionList.count(); ++i) {
+ QObjectPrivate::Connection *c = &connectionList[i];
+ if (c->receiver
+ && (r == 0 || (c->receiver == r
+ && (method_index < 0 || c->method == method_index)))) {
+ QMutex *m = &c->receiver->d_func()->threadData->mutex;
+ if (!receiverMutex && senderMutex != m) {
+ // need to relock this receiver and sender in the correct order
+ bool needToUnlock = QOrderedMutexLocker::relock(senderMutex, m);
+ c = &connectionList[i];
+ if (c->receiver)
+ c->receiver->d_func()->derefSender(s, signal_index);
+ if (needToUnlock)
+ m->unlock();
+ } else {
+ // no need to unlock
+ c->receiver->d_func()->derefSender(s, signal_index);
+ }
+ if (c->argumentTypes && c->argumentTypes != &DIRECT_CONNECTION_ONLY) {
+ qFree(c->argumentTypes);
+ c->argumentTypes = 0;
+ }
+ c->receiver = 0;
+
+ success = true;
+ connectionLists->dirty = true;
+ }
+ }
+ }
+
+ --connectionLists->inUse;
+ Q_ASSERT(connectionLists->inUse >= 0);
+ if (connectionLists->orphaned && !connectionLists->inUse)
+ delete connectionLists;
+
+ return success;
+}
+
+/*!
+ \fn void QMetaObject::connectSlotsByName(QObject *object)
+
+ Searches recursively for all child objects of the given \a object, and connects
+ matching signals from them to slots of \a object that follow the following form:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 33
+
+ Let's assume our object has a child object of type QPushButton with
+ the \l{QObject::objectName}{object name} \c{button1}. The slot to catch the
+ button's \c{clicked()} signal would be:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 34
+
+ \sa QObject::setObjectName()
+ */
+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, int signal, const QObjectPrivate::Connection &c,
+ void **argv, QSemaphore *semaphore = 0)
+{
+ if (!c.argumentTypes || c.argumentTypes != &DIRECT_CONNECTION_ONLY) {
+ QMetaMethod m = sender->metaObject()->method(signal);
+ QObjectPrivate::Connection &x = const_cast<QObjectPrivate::Connection &>(c);
+ int *tmp = queuedConnectionTypes(m.parameterTypes());
+ if (!tmp) // cannot queue arguments
+ tmp = &DIRECT_CONNECTION_ONLY;
+ if (!x.argumentTypes.testAndSetOrdered(0, tmp)) {
+ if (tmp != &DIRECT_CONNECTION_ONLY)
+ qFree(tmp);
+ }
+ }
+ if (c.argumentTypes == &DIRECT_CONNECTION_ONLY) // cannot activate
+ return;
+ int nargs = 1; // include return type
+ while (c.argumentTypes[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.argumentTypes[n-1]), argv[n]);
+ QCoreApplication::postEvent(c.receiver, new QMetaCallEvent(c.method,
+ sender,
+ signal,
+ nargs,
+ types,
+ args,
+ semaphore));
+}
+
+static void blocking_activate(QObject *sender, int signal, const QObjectPrivate::Connection &c, void **argv)
+{
+ if (QThread::currentThread() == c.receiver->thread()) {
+ qWarning("Qt: Dead lock detected while activating a BlockingQueuedConnection: "
+ "Sender is %s(%p), receiver is %s(%p)",
+ sender->metaObject()->className(), sender,
+ c.receiver->metaObject()->className(), c.receiver);
+ }
+
+#ifdef QT_NO_THREAD
+ queued_activate(sender, signal, c, argv);
+#else
+ QSemaphore semaphore;
+ queued_activate(sender, signal, c, argv, &semaphore);
+ QMutex *mutex = &QThreadData::get2(sender->thread())->mutex;
+ mutex->unlock();
+ semaphore.acquire();
+ mutex->lock();
+#endif
+}
+
+/*!\internal
+ */
+void QMetaObject::activate(QObject *sender, int from_signal_index, int to_signal_index, void **argv)
+{
+ if (sender->d_func()->blockSig)
+ 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);
+ }
+
+ QMutexLocker locker(&sender->d_func()->threadData->mutex);
+ QThreadData *currentThreadData = QThreadData::current();
+
+ QObjectConnectionListVector *connectionLists = sender->d_func()->connectionLists;
+ if (!connectionLists) {
+ if (qt_signal_spy_callback_set.signal_end_callback != 0)
+ qt_signal_spy_callback_set.signal_end_callback(sender, from_signal_index);
+ return;
+ }
+ ++connectionLists->inUse;
+
+ // emit signals in the following order: from_signal_index <= signals <= to_signal_index, signal < 0
+ for (int signal = from_signal_index;
+ (signal >= from_signal_index && signal <= to_signal_index) || (signal == -2);
+ (signal == to_signal_index ? signal = -2 : ++signal))
+ {
+ if (signal >= connectionLists->count()) {
+ signal = to_signal_index;
+ continue;
+ }
+ int count = connectionLists->at(signal).count();
+ for (int i = 0; i < count; ++i) {
+ const QObjectPrivate::Connection *c = &connectionLists->at(signal)[i];
+ if (!c->receiver)
+ continue;
+
+ QObject * const receiver = c->receiver;
+
+ // determine if this connection should be sent immediately or
+ // put into the event queue
+ if ((c->connectionType == Qt::AutoConnection
+ && (currentThreadData != sender->d_func()->threadData
+ || receiver->d_func()->threadData != sender->d_func()->threadData))
+ || (c->connectionType == Qt::QueuedConnection)) {
+ queued_activate(sender, signal, *c, argv);
+ continue;
+ } else if (c->connectionType == Qt::BlockingQueuedConnection) {
+ blocking_activate(sender, signal, *c, argv);
+ continue;
+ }
+
+ const int method = c->method;
+ QObjectPrivate::Sender currentSender;
+ currentSender.sender = sender;
+ currentSender.signal = signal < 0 ? from_signal_index : signal;
+ currentSender.ref = 1;
+ QObjectPrivate::Sender *previousSender = 0;
+ if (currentThreadData == receiver->d_func()->threadData)
+ previousSender = QObjectPrivate::setCurrentSender(receiver, &currentSender);
+ locker.unlock();
+
+ if (qt_signal_spy_callback_set.slot_begin_callback != 0) {
+ qt_signal_spy_callback_set.slot_begin_callback(receiver,
+ method,
+ argv ? argv : empty_argv);
+ }
+
+#if defined(QT_NO_EXCEPTIONS)
+ receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
+#else
+ try {
+ receiver->qt_metacall(QMetaObject::InvokeMetaMethod, method, argv ? argv : empty_argv);
+ } catch (...) {
+ locker.relock();
+
+ QObjectPrivate::resetCurrentSender(receiver, &currentSender, previousSender);
+
+ --connectionLists->inUse;
+ Q_ASSERT(connectionLists->inUse >= 0);
+ if (connectionLists->orphaned && !connectionLists->inUse)
+ delete connectionLists;
+ throw;
+ }
+#endif
+
+ locker.relock();
+
+ if (qt_signal_spy_callback_set.slot_end_callback != 0)
+ qt_signal_spy_callback_set.slot_end_callback(receiver, method);
+
+ QObjectPrivate::resetCurrentSender(receiver, &currentSender, previousSender);
+
+ if (connectionLists->orphaned)
+ break;
+ }
+
+ if (connectionLists->orphaned)
+ break;
+ }
+
+ --connectionLists->inUse;
+ Q_ASSERT(connectionLists->inUse >= 0);
+ if (connectionLists->orphaned) {
+ if (!connectionLists->inUse)
+ delete connectionLists;
+ } else {
+ sender->d_func()->cleanConnectionLists();
+ }
+
+ locker.unlock();
+
+ if (qt_signal_spy_callback_set.signal_end_callback != 0)
+ qt_signal_spy_callback_set.signal_end_callback(sender, from_signal_index);
+}
+
+
+/*!\internal
+ */
+void QMetaObject::activate(QObject *sender, int signal_index, void **argv)
+{
+ if (signal_index < 32
+ && !qt_signal_spy_callback_set.signal_begin_callback
+ && !qt_signal_spy_callback_set.signal_end_callback) {
+ uint signal_mask = 1 << signal_index;
+ if ((sender->d_func()->connectedSignals & signal_mask) == 0)
+ // nothing connected to these signals, and no spy
+ return;
+ }
+ activate(sender, signal_index, signal_index, argv);
+}
+
+/*!\internal
+ */
+void QMetaObject::activate(QObject *sender, const QMetaObject *m, int local_signal_index,
+ void **argv)
+{
+ int signal_index = m->methodOffset() + local_signal_index;
+ if (signal_index < 32
+ && !qt_signal_spy_callback_set.signal_begin_callback
+ && !qt_signal_spy_callback_set.signal_end_callback) {
+ uint signal_mask = 1 << signal_index;
+ if ((sender->d_func()->connectedSignals & signal_mask) == 0)
+ // nothing connected to these signals, and no spy
+ return;
+ }
+ activate(sender, signal_index, signal_index, argv);
+}
+
+/*!\internal
+ */
+void QMetaObject::activate(QObject *sender, const QMetaObject *m,
+ int from_local_signal_index, int to_local_signal_index, void **argv)
+{
+ int offset = m->methodOffset();
+ int from_signal_index = offset + from_local_signal_index;
+ int to_signal_index = offset + to_local_signal_index;
+ if (to_signal_index < 32
+ && !qt_signal_spy_callback_set.signal_begin_callback
+ && !qt_signal_spy_callback_set.signal_end_callback) {
+ uint signal_mask = (1 << (to_signal_index + 1)) - 1;
+ signal_mask ^= (1 << from_signal_index) - 1;
+ if ((sender->d_func()->connectedSignals & signal_mask) == 0)
+ // nothing connected to these signals, and no spy
+ return;
+ }
+ activate(sender, from_signal_index, to_signal_index, argv);
+}
+
+
+/*****************************************************************************
+ Properties
+ *****************************************************************************/
+
+#ifndef QT_NO_PROPERTIES
+
+/*!
+ Sets the value of the object's \a name property to \a value.
+
+ If the property is defined in the class using Q_PROPERTY then
+ true is returned on success and false otherwise. If the property
+ is not defined using Q_PROPERTY, and therefore not listed in the
+ meta-object, it is added as a dynamic property and false is returned.
+
+ Information about all available properties is provided through the
+ metaObject() and dynamicPropertyNames().
+
+ Dynamic properties can be queried again using property() and can be
+ removed by setting the property value to an invalid QVariant.
+ Changing the value of a dynamic property causes a QDynamicPropertyChangeEvent
+ to be sent to the object.
+
+ \bold{Note:} Dynamic properties starting with "_q_" are reserved for internal
+ purposes.
+
+ \sa property(), metaObject(), dynamicPropertyNames()
+*/
+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.isValid()) {
+ 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);
+}
+
+/*!
+ Returns the value of the object's \a name property.
+
+ If no such property exists, the returned variant is invalid.
+
+ Information about all available properties is provided through the
+ metaObject() and dynamicPropertyNames().
+
+ \sa setProperty(), QVariant::isValid(), metaObject(), dynamicPropertyNames()
+*/
+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);
+}
+
+/*!
+ \since 4.2
+
+ Returns the names of all properties that were dynamically added to
+ the object using setProperty().
+*/
+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(' ', level / 2 * 8);
+ 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
+}
+
+/*!
+ Dumps a tree of children to the debug output.
+
+ This function is useful for debugging, but does nothing if the
+ library has been compiled in release mode (i.e. without debugging
+ information).
+
+ \sa dumpObjectInfo()
+*/
+
+void QObject::dumpObjectTree()
+{
+ dumpRecursive(0, this);
+}
+
+/*!
+ Dumps information about signal connections, etc. for this object
+ to the debug output.
+
+ This function is useful for debugging, but does nothing if the
+ library has been compiled in release mode (i.e. without debugging
+ information).
+
+ \sa dumpObjectTree()
+*/
+
+void QObject::dumpObjectInfo()
+{
+#if defined(QT_DEBUG)
+ qDebug("OBJECT %s::%s", metaObject()->className(),
+ objectName().isEmpty() ? "unnamed" : objectName().toLocal8Bit().data());
+
+ Q_D(QObject);
+ QMutexLocker locker(&d->threadData->mutex);
+
+ // first, look for connections where this object is the sender
+ qDebug(" SIGNALS OUT");
+
+ if (d->connectionLists) {
+ for (int signal_index = 0; signal_index < d->connectionLists->count(); ++signal_index) {
+ const QMetaMethod signal = metaObject()->method(signal_index);
+ qDebug(" signal: %s", signal.signature());
+
+ // receivers
+ const QObjectPrivate::ConnectionList &connectionList = d->connectionLists->at(signal_index);
+ for (int i = 0; i < connectionList.count(); ++i) {
+ const QObjectPrivate::Connection &c = connectionList.at(i);
+ if (!c.receiver) {
+ qDebug(" <Disconnected receiver>");
+ continue;
+ }
+ const QMetaObject *receiverMetaObject = c.receiver->metaObject();
+ const QMetaMethod method = receiverMetaObject->method(c.method);
+ qDebug(" --> %s::%s %s",
+ receiverMetaObject->className(),
+ c.receiver->objectName().isEmpty() ? "unnamed" : qPrintable(c.receiver->objectName()),
+ method.signature());
+ }
+ }
+ } else {
+ qDebug( " <None>" );
+ }
+
+ // now look for connections where this object is the receiver
+ qDebug(" SIGNALS IN");
+
+ if (!d->senders.isEmpty()) {
+ for (int i = 0; i < d->senders.count(); ++i) {
+ const QObjectPrivate::Sender &s = d->senders.at(i);
+ const QMetaObject *senderMetaObject = s.sender->metaObject();
+ const QMetaMethod signal = senderMetaObject->method(s.signal);
+ qDebug(" <-- %s::%s %s",
+ senderMetaObject->className(),
+ s.sender->objectName().isEmpty() ? "unnamed" : qPrintable(s.sender->objectName()),
+ signal.signature());
+ }
+ } else {
+ qDebug(" <None>");
+ }
+#endif
+}
+
+#ifndef QT_NO_USERDATA
+/*!\internal
+ */
+uint QObject::registerUserData()
+{
+ static int user_data_registration = 0;
+ return user_data_registration++;
+}
+
+/*!\internal
+ */
+QObjectUserData::~QObjectUserData()
+{
+}
+
+/*!\internal
+ */
+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;
+}
+
+/*!\internal
+ */
+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
+
+/*!
+ \fn void QObject::insertChild(QObject *object)
+
+ Use setParent() instead, i.e., call object->setParent(this).
+*/
+
+/*!
+ \fn void QObject::removeChild(QObject *object)
+
+ Use setParent() instead, i.e., call object->setParent(0).
+*/
+
+/*!
+ \fn bool QObject::isA(const char *className) const
+
+ Compare \a className with the object's metaObject()->className() instead.
+*/
+
+/*!
+ \fn const char *QObject::className() const
+
+ Use metaObject()->className() instead.
+*/
+
+/*!
+ \fn const char *QObject::name() const
+
+ Use objectName() instead.
+*/
+
+/*!
+ \fn const char *QObject::name(const char *defaultName) const
+
+ Use objectName() instead.
+*/
+
+/*!
+ \fn void QObject::setName(const char *name)
+
+ Use setObjectName() instead.
+*/
+
+/*!
+ \fn bool QObject::checkConnectArgs(const char *signal, const
+ QObject *object, const char *method)
+
+ Use QMetaObject::checkConnectArgs() instead.
+*/
+
+/*!
+ \fn QByteArray QObject::normalizeSignalSlot(const char *signalSlot)
+
+ Use QMetaObject::normalizedSignature() instead.
+*/
+
+/*!
+ \fn const char *QMetaObject::superClassName() const
+
+ \internal
+*/
+
+/*!
+ \macro Q_CLASSINFO(Name, Value)
+ \relates QObject
+
+ This macro associates extra information to the class, which is
+ available using QObject::metaObject(). Except for the ActiveQt
+ extension, Qt doesn't use this information.
+
+ The extra information takes the form of a \a Name string and a \a
+ Value literal string.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 35
+
+ \sa QMetaObject::classInfo()
+*/
+
+/*!
+ \macro Q_INTERFACES(...)
+ \relates QObject
+
+ This macro tells Qt which interfaces the class implements. This
+ is used when implementing plugins.
+
+ Example:
+
+ \snippet examples/tools/plugandpaintplugins/basictools/basictoolsplugin.h 1
+ \dots
+ \snippet examples/tools/plugandpaintplugins/basictools/basictoolsplugin.h 3
+
+ See the \l{tools/plugandpaintplugins/basictools}{Plug & Paint
+ Basic Tools} example for details.
+
+ \sa Q_DECLARE_INTERFACE(), Q_EXPORT_PLUGIN2(), {How to Create Qt Plugins}
+*/
+
+/*!
+ \macro Q_PROPERTY(...)
+ \relates QObject
+
+ This macro is used for declaring properties in classes that
+ inherit QObject. Properties behave like class data members, but
+ they have additional features accessible through the \l
+ {Meta-Object System}.
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 36
+
+ The property name and type and the \c READ function are required.
+ The type can be any type supported by QVariant, or it can be a
+ user-defined type. The other items are optional, but a \c WRITE
+ function is common. The attributes default to true except \c USER,
+ which defaults to false.
+
+ For example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 37
+
+ For more details about how to use this macro, and a more detailed
+ example of its use, see the discussion on \l {Qt's Property System}.
+
+ \sa {Qt's Property System}
+*/
+
+/*!
+ \macro Q_ENUMS(...)
+ \relates QObject
+
+ This macro registers one or several enum types to the meta-object
+ system.
+
+ For example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 38
+
+ If you want to register an enum that is declared in another class,
+ the enum must be fully qualified with the name of the class
+ defining it. In addition, the class \e defining the enum has to
+ inherit QObject as well as declare the enum using Q_ENUMS().
+
+ \sa {Qt's Property System}
+*/
+
+/*!
+ \macro Q_FLAGS(...)
+ \relates QObject
+
+ This macro registers one or several \l{QFlags}{flags types} to the
+ meta-object system.
+
+ Example:
+
+ \snippet doc/src/snippets/code/src_corelib_kernel_qobject.cpp 39
+
+ \note This macro takes care of registering individual flag values
+ with the meta-object system, so it is unnecessary to use Q_ENUMS()
+ in addition to this macro.
+
+ \sa {Qt's Property System}
+*/
+
+/*!
+ \macro Q_OBJECT
+ \relates QObject
+
+ The Q_OBJECT macro must appear in the private section of a class
+ definition that declares its own signals and slots or that uses
+ other services provided by Qt's meta-object system.
+
+ For example:
+
+ \snippet doc/src/snippets/signalsandslots/signalsandslots.h 1
+ \codeline
+ \snippet doc/src/snippets/signalsandslots/signalsandslots.h 2
+ \snippet doc/src/snippets/signalsandslots/signalsandslots.h 3
+
+ \note This macro requires the class to be a subclass of QObject. Use
+ Q_GADGET instead of Q_OBJECT to enable the meta object system's support
+ for enums in a class that is not a QObject subclass. Q_GADGET makes a
+ class member, \c{staticMetaObject}, available.
+ \c{staticMetaObject} is of type QMetaObject and provides access to the
+ enums declared with Q_ENUMS.
+ Q_GADGET is provided only for C++.
+
+ \sa {Meta-Object System}, {Signals and Slots}, {Qt's Property System}
+*/
+
+/*!
+ \macro Q_SIGNALS
+ \relates QObject
+
+ Use this macro to replace the \c signals keyword in class
+ declarations, when you want to use Qt Signals and Slots with a
+ \l{3rd Party Signals and Slots} {3rd party signal/slot mechanism}.
+
+ The macro is normally used when \c no_keywords is specified with
+ the \c CONFIG variable in the \c .pro file, but it can be used
+ even when \c no_keywords is \e not specified.
+*/
+
+/*!
+ \macro Q_SIGNAL
+ \relates QObject
+
+ This is an additional macro that allows you to mark a single
+ function as a signal. It can be quite useful, especially when you
+ use a 3rd-party source code parser which doesn't understand a \c
+ signals or \c Q_SIGNALS groups.
+
+ Use this macro to replace the \c signals keyword in class
+ declarations, when you want to use Qt Signals and Slots with a
+ \l{3rd Party Signals and Slots} {3rd party signal/slot mechanism}.
+
+ The macro is normally used when \c no_keywords is specified with
+ the \c CONFIG variable in the \c .pro file, but it can be used
+ even when \c no_keywords is \e not specified.
+*/
+
+/*!
+ \macro Q_SLOTS
+ \relates QObject
+
+ Use this macro to replace the \c slots keyword in class
+ declarations, when you want to use Qt Signals and Slots with a
+ \l{3rd Party Signals and Slots} {3rd party signal/slot mechanism}.
+
+ The macro is normally used when \c no_keywords is specified with
+ the \c CONFIG variable in the \c .pro file, but it can be used
+ even when \c no_keywords is \e not specified.
+*/
+
+/*!
+ \macro Q_SLOT
+ \relates QObject
+
+ This is an additional macro that allows you to mark a single
+ function as a slot. It can be quite useful, especially when you
+ use a 3rd-party source code parser which doesn't understand a \c
+ slots or \c Q_SLOTS groups.
+
+ Use this macro to replace the \c slots keyword in class
+ declarations, when you want to use Qt Signals and Slots with a
+ \l{3rd Party Signals and Slots} {3rd party signal/slot mechanism}.
+
+ The macro is normally used when \c no_keywords is specified with
+ the \c CONFIG variable in the \c .pro file, but it can be used
+ even when \c no_keywords is \e not specified.
+*/
+
+/*!
+ \macro Q_EMIT
+ \relates QObject
+
+ Use this macro to replace the \c emit keyword for emitting
+ signals, when you want to use Qt Signals and Slots with a
+ \l{3rd Party Signals and Slots} {3rd party signal/slot mechanism}.
+
+ The macro is normally used when \c no_keywords is specified with
+ the \c CONFIG variable in the \c .pro file, but it can be used
+ even when \c no_keywords is \e not specified.
+*/
+
+/*!
+ \macro Q_INVOKABLE
+ \relates QObject
+
+ Apply this macro to definitions of member functions to allow them to
+ be invoked via the meta-object system. The macro is written before
+ the return type, as shown in the following example:
+
+ \snippet snippets/qmetaobject-invokable/window.h Window class with invokable method
+
+ The \c invokableMethod() function is marked up using Q_INVOKABLE, causing
+ it to be registered with the meta-object system and enabling it to be
+ invoked using QMetaObject::invokeMethod().
+ Since \c normalMethod() function is not registered in this way, it cannot
+ be invoked using QMetaObject::invokeMethod().
+*/
+
+/*!
+ \typedef QObjectList
+ \relates QObject
+
+ Synonym for QList<QObject *>.
+*/
+
+#ifdef QT_JAMBI_BUILD
+class QDPtrAccessor : public QObject {
+public:
+ QObjectData *d() const { return d_ptr; }
+};
+#endif
+
+void qDeleteInEventHandler(QObject *o)
+{
+#ifdef QT_JAMBI_BUILD
+ if (!o)
+ return;
+ ((QDPtrAccessor *) o)->d()->inEventHandler = false;
+#endif
+ delete o;
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qobject.cpp"
generated by cgit v0.12 at 2024-11-23 06:59:07 (GMT)