6. Qt 信号与信号槽（5）-QObjectPrivate

QObjectPrivate 是QObject的d_ptr指针

QObject.h

class Q_CORE_EXPORT QObject{protected:QObject(QObjectPrivate &dd, QObject *parent = nullptr);protected:QScopedPointer<QObjectData> d_ptr;
}

QObject.cpp

QObject::QObject(QObject *parent): d_ptr(new QObjectPrivate)
{Q_D(QObject);d_ptr->q_ptr = this;

class QObjectData


class Q_CORE_EXPORT QObjectData {public:virtual ~QObjectData() = 0;QObject *q_ptr;QObject *parent;QObjectList children;uint isWidget : 1;uint blockSig : 1;uint wasDeleted : 1;uint isDeletingChildren : 1;uint sendChildEvents : 1;uint receiveChildEvents : 1;uint isWindow : 1; //for QWindowuint deleteLaterCalled : 1;uint unused : 24;int postedEvents;QDynamicMetaObjectData *metaObject;QMetaObject *dynamicMetaObject() const;
};

class QObjectPrivate

class Q_CORE_EXPORT QObjectPrivate : public QObjectData
{Q_DECLARE_PUBLIC(QObject)public:struct ExtraData{ExtraData() {}#ifndef QT_NO_USERDATAQVector<QObjectUserData *> userData;#endifQList<QByteArray> propertyNames;QVector<QVariant> propertyValues;QVector<int> runningTimers;QList<QPointer<QObject> > eventFilters;QString objectName;};typedef void (*StaticMetaCallFunction)(QObject *, QMetaObject::Call, int, void **);struct Connection{QObject *sender;QObject *receiver;union {StaticMetaCallFunction callFunction;QtPrivate::QSlotObjectBase *slotObj;};// The next pointer for the singly-linked ConnectionListConnection *nextConnectionList;//senders linked listConnection *next;Connection **prev;QAtomicPointer<const int> argumentTypes;QAtomicInt ref_;ushort method_offset;ushort method_relative;uint signal_index : 27; // In signal range (see QObjectPrivate::signalIndex())ushort connectionType : 3; // 0 == auto, 1 == direct, 2 == queued, 4 == blockingushort isSlotObject : 1;ushort ownArgumentTypes : 1;Connection() : nextConnectionList(nullptr), ref_(2), ownArgumentTypes(true) {//ref_ is 2 for the use in the internal lists, and for the use in QMetaObject::Connection}~Connection();int method() const { Q_ASSERT(!isSlotObject); return method_offset + method_relative; }void ref() { ref_.ref(); }void deref() {if (!ref_.deref()) {Q_ASSERT(!receiver);delete this;}}};// ConnectionList is a singly-linked liststruct ConnectionList {ConnectionList() : first(nullptr), last(nullptr) {}Connection *first;Connection *last;};struct Sender{QObject *sender;int signal;int ref;};QObjectPrivate(int version = QObjectPrivateVersion);virtual ~QObjectPrivate();void deleteChildren();void setParent_helper(QObject *);void moveToThread_helper();void setThreadData_helper(QThreadData *currentData, QThreadData *targetData);void _q_reregisterTimers(void *pointer);bool isSender(const QObject *receiver, const char *signal) const;QObjectList receiverList(const char *signal) const;QObjectList senderList() const;void addConnection(int signal, Connection *c);void cleanConnectionLists();static inline Sender *setCurrentSender(QObject *receiver,Sender *sender);static inline void resetCurrentSender(QObject *receiver,Sender *currentSender,Sender *previousSender);static QObjectPrivate *get(QObject *o) {return o->d_func();}static const QObjectPrivate *get(const QObject *o) { return o->d_func(); }int signalIndex(const char *signalName, const QMetaObject **meta = nullptr) const;inline bool isSignalConnected(uint signalIdx, bool checkDeclarative = true) const;inline bool isDeclarativeSignalConnected(uint signalIdx) const;// To allow abitrary objects to call connectNotify()/disconnectNotify() without making// the API public in QObject. This is used by QQmlNotifierEndpoint.inline void connectNotify(const QMetaMethod &signal);inline void disconnectNotify(const QMetaMethod &signal);template <typename Func1, typename Func2>static inline QMetaObject::Connection connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,const typename QtPrivate::FunctionPointer<Func2>::Object *receiverPrivate, Func2 slot,Qt::ConnectionType type = Qt::AutoConnection);template <typename Func1, typename Func2>static inline bool disconnect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,const typename QtPrivate::FunctionPointer<Func2>::Object *receiverPrivate, Func2 slot);static QMetaObject::Connection connectImpl(const QObject *sender, int signal_index,const QObject *receiver, void **slot,QtPrivate::QSlotObjectBase *slotObj, Qt::ConnectionType type,const int *types, const QMetaObject *senderMetaObject);static QMetaObject::Connection connect(const QObject *sender, int signal_index, QtPrivate::QSlotObjectBase *slotObj, Qt::ConnectionType type);static bool disconnect(const QObject *sender, int signal_index, void **slot);
public:ExtraData *extraData;    // extra data set by the userQThreadData *threadData; // id of the thread that owns the objectQObjectConnectionListVector *connectionLists;Connection *senders;     // linked list of connections connected to this objectSender *currentSender;   // object currently activating the objectmutable quint32 connectedSignals[2];union {QObject *currentChildBeingDeleted; // should only be used when QObjectData::isDeletingChildren is setQAbstractDeclarativeData *declarativeData; //extra data used by the declarative module};// these objects are all used to indicate that a QObject was deleted// plus QPointer, which keeps a separate listQAtomicPointer<QtSharedPointer::ExternalRefCountData> sharedRefcount;
};

请注意成员变量：
ExtraData *extraData; // extra data set by the user
QThreadData *threadData; // id of the thread that owns the object
QObjectConnectionListVector *connectionLists;
Connection *senders; // linked list of connections connected to this object
Sender *currentSender; // object currently activating the object
mutable quint32 connectedSignals[2];

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