summaryrefslogtreecommitdiffstats
path: root/src/corelib/kernel/qobject_p.h
blob: 863689fddd2ffe89a402a653c9e8c9e99ca4fd34 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Copyright (C) 2013 Olivier Goffart <ogoffart@woboq.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QOBJECT_P_H
#define QOBJECT_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/private/qglobal_p.h>
#include "QtCore/qobject.h"
#include "QtCore/qpointer.h"
#include "QtCore/qsharedpointer.h"
#include "QtCore/qcoreevent.h"
#include "QtCore/qlist.h"
#include "QtCore/qvector.h"
#include "QtCore/qvariant.h"
#include "QtCore/qreadwritelock.h"

QT_BEGIN_NAMESPACE

class QVariant;
class QThreadData;
class QObjectConnectionListVector;
namespace QtSharedPointer { struct ExternalRefCountData; }

/* for Qt Test */
struct QSignalSpyCallbackSet
{
    typedef void (*BeginCallback)(QObject *caller, int signal_or_method_index, void **argv);
    typedef void (*EndCallback)(QObject *caller, int signal_or_method_index);
    BeginCallback signal_begin_callback,
                    slot_begin_callback;
    EndCallback signal_end_callback,
                slot_end_callback;
};
void Q_CORE_EXPORT qt_register_signal_spy_callbacks(QSignalSpyCallbackSet *callback_set);

extern Q_CORE_EXPORT QBasicAtomicPointer<QSignalSpyCallbackSet> qt_signal_spy_callback_set;

enum { QObjectPrivateVersion = QT_VERSION };

class Q_CORE_EXPORT QAbstractDeclarativeData
{
public:
    static void (*destroyed)(QAbstractDeclarativeData *, QObject *);
    static void (*destroyed_qml1)(QAbstractDeclarativeData *, QObject *);
    static void (*parentChanged)(QAbstractDeclarativeData *, QObject *, QObject *);
    static void (*signalEmitted)(QAbstractDeclarativeData *, QObject *, int, void **);
    static int  (*receivers)(QAbstractDeclarativeData *, const QObject *, int);
    static bool (*isSignalConnected)(QAbstractDeclarativeData *, const QObject *, int);
    static void (*setWidgetParent)(QObject *, QObject *); // Used by the QML engine to specify parents for widgets. Set by QtWidgets.
};

// This is an implementation of QAbstractDeclarativeData that is identical with
// the implementation in QtDeclarative and QtQml for the first bit
struct QAbstractDeclarativeDataImpl : public QAbstractDeclarativeData
{
    quint32 ownedByQml1:1;
    quint32 unused: 31;
};

class Q_CORE_EXPORT QObjectPrivate : public QObjectData
{
    Q_DECLARE_PUBLIC(QObject)

public:
    struct ExtraData
    {
        ExtraData() {}
    #ifndef QT_NO_USERDATA
        QVector<QObjectUserData *> userData;
    #endif
        QList<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 ConnectionList
        Connection *nextConnectionList;
        //senders linked list
        Connection *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 == blocking
        ushort 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 list
    struct ConnectionList {
        ConnectionList() : first(nullptr), last(nullptr) {}
        Connection *first;
        Connection *last;
    };

    struct Sender
    {
        Sender(QObject *receiver, QObject *sender, int signal)
            : receiver(receiver), sender(sender), signal(signal)
        {
            if (receiver) {
                ConnectionData *cd = receiver->d_func()->connections.load();
                previous = cd->currentSender;
                cd->currentSender = this;
            }
        }
        ~Sender()
        {
            if (receiver)
                receiver->d_func()->connections.load()->currentSender = previous;
        }
        void receiverDeleted()
        {
            Sender *s = this;
            while (s) {
                s->receiver = nullptr;
                s = s->previous;
            }
        }
        Sender *previous;
        QObject *receiver;
        QObject *sender;
        int signal;
    };

    /*
        This contains the all connections from and to an object.

        The signalVector contains the lists of connections for a given signal. The index in the vector correspond
        to the signal index. The signal index is the one returned by QObjectPrivate::signalIndex (not
        QMetaObject::indexOfSignal). allsignals contains a list of special connections that will get invoked on
        any signal emission. This is done by connecting to signal index -1.

        This vector is protected by the object mutex (signalSlotLock())

        Each Connection is also part of a 'senders' linked list. This one contains all connections connected
        to a slot in this object. The mutex of the receiver must be locked when touching the pointers of this
        linked list.
    */
    struct ConnectionData {
        bool objectDeleted = false; //the QObject owner of this vector has been destroyed while the vector was inUse
        struct Ref {
            int _ref = 0;
            void ref() { ++_ref; }
            int deref() { return --_ref; }
            operator int() const { return _ref; }
        };

        Ref ref;
        bool dirty = false; //some Connection have been disconnected (their receiver is 0) but not removed from the list yet
        ConnectionList allsignals;
        QVector<ConnectionList> signalVector;
        Connection *senders = nullptr;
        Sender *currentSender = nullptr;   // object currently activating the object

        ConnectionList &connectionsForSignal(int signal)
        {
            return signal < 0 ? allsignals : signalVector[signal];
        }
    };

    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 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;
    bool isSignalConnected(uint signalIdx, bool checkDeclarative = true) const;
    bool maybeSignalConnected(uint signalIndex) 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);

    void ensureConnectionData()
    {
        if (connections.load())
            return;
        ConnectionData *cd = new ConnectionData;
        cd->ref.ref();
        connections.store(cd);
    }
public:
    ExtraData *extraData;    // extra data set by the user
    QThreadData *threadData; // id of the thread that owns the object

    using ConnectionDataPointer = QExplicitlySharedDataPointer<ConnectionData>;
    QAtomicPointer<ConnectionData> connections;

    union {
        QObject *currentChildBeingDeleted; // should only be used when QObjectData::isDeletingChildren is set
        QAbstractDeclarativeData *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 list
    QAtomicPointer<QtSharedPointer::ExternalRefCountData> sharedRefcount;
};

Q_DECLARE_TYPEINFO(QObjectPrivate::ConnectionList, Q_MOVABLE_TYPE);

inline bool QObjectPrivate::isDeclarativeSignalConnected(uint signal_index) const
{
    return declarativeData && QAbstractDeclarativeData::isSignalConnected
            && QAbstractDeclarativeData::isSignalConnected(declarativeData, q_func(), signal_index);
}

inline void QObjectPrivate::connectNotify(const QMetaMethod &signal)
{
    q_ptr->connectNotify(signal);
}

inline void QObjectPrivate::disconnectNotify(const QMetaMethod &signal)
{
    q_ptr->disconnectNotify(signal);
}

namespace QtPrivate {
template<typename Func, typename Args, typename R> class QPrivateSlotObject : public QSlotObjectBase
{
    typedef QtPrivate::FunctionPointer<Func> FuncType;
    Func function;
    static void impl(int which, QSlotObjectBase *this_, QObject *r, void **a, bool *ret)
    {
        switch (which) {
            case Destroy:
                delete static_cast<QPrivateSlotObject*>(this_);
                break;
            case Call:
                FuncType::template call<Args, R>(static_cast<QPrivateSlotObject*>(this_)->function,
                                                 static_cast<typename FuncType::Object *>(QObjectPrivate::get(r)), a);
                break;
            case Compare:
                *ret = *reinterpret_cast<Func *>(a) == static_cast<QPrivateSlotObject*>(this_)->function;
                break;
            case NumOperations: ;
        }
    }
public:
    explicit QPrivateSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
};
} //namespace QtPrivate

template <typename Func1, typename Func2>
inline QMetaObject::Connection QObjectPrivate::connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
                                                       const typename QtPrivate::FunctionPointer<Func2>::Object *receiverPrivate, Func2 slot,
                                                       Qt::ConnectionType type)
{
    typedef QtPrivate::FunctionPointer<Func1> SignalType;
    typedef QtPrivate::FunctionPointer<Func2> SlotType;
    Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                      "No Q_OBJECT in the class with the signal");

    //compilation error if the arguments does not match.
    Q_STATIC_ASSERT_X(int(SignalType::ArgumentCount) >= int(SlotType::ArgumentCount),
                      "The slot requires more arguments than the signal provides.");
    Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                      "Signal and slot arguments are not compatible.");
    Q_STATIC_ASSERT_X((QtPrivate::AreArgumentsCompatible<typename SlotType::ReturnType, typename SignalType::ReturnType>::value),
                      "Return type of the slot is not compatible with the return type of the signal.");

    const int *types = nullptr;
    if (type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
        types = QtPrivate::ConnectionTypes<typename SignalType::Arguments>::types();

    return QObject::connectImpl(sender, reinterpret_cast<void **>(&signal),
        receiverPrivate->q_ptr, reinterpret_cast<void **>(&slot),
        new QtPrivate::QPrivateSlotObject<Func2, typename QtPrivate::List_Left<typename SignalType::Arguments, SlotType::ArgumentCount>::Value,
                                        typename SignalType::ReturnType>(slot),
        type, types, &SignalType::Object::staticMetaObject);
}

template <typename Func1, typename Func2>
bool QObjectPrivate::disconnect(const typename QtPrivate::FunctionPointer< Func1 >::Object* sender, Func1 signal,
                                const typename QtPrivate::FunctionPointer< Func2 >::Object* receiverPrivate, Func2 slot)
{
    typedef QtPrivate::FunctionPointer<Func1> SignalType;
    typedef QtPrivate::FunctionPointer<Func2> SlotType;
    Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<typename SignalType::Object>::Value,
                      "No Q_OBJECT in the class with the signal");
    //compilation error if the arguments does not match.
    Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value),
                      "Signal and slot arguments are not compatible.");
    return QObject::disconnectImpl(sender, reinterpret_cast<void **>(&signal),
                          receiverPrivate->q_ptr, reinterpret_cast<void **>(&slot),
                          &SignalType::Object::staticMetaObject);
}

Q_DECLARE_TYPEINFO(QObjectPrivate::Connection, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QObjectPrivate::Sender, Q_MOVABLE_TYPE);

class QSemaphore;
class Q_CORE_EXPORT QMetaCallEvent : public QEvent
{
public:
    QMetaCallEvent(ushort method_offset, ushort method_relative, QObjectPrivate::StaticMetaCallFunction callFunction , const QObject *sender, int signalId,
                   int nargs = 0, int *types = nullptr, void **args = nullptr, QSemaphore *semaphore = nullptr);
    /*! \internal
        \a signalId is in the signal index range (see QObjectPrivate::signalIndex()).
    */
    QMetaCallEvent(QtPrivate::QSlotObjectBase *slotObj, const QObject *sender, int signalId,
                   int nargs = 0, int *types = nullptr, void **args = nullptr, QSemaphore *semaphore = nullptr);

    ~QMetaCallEvent();

    inline int id() const { return method_offset_ + method_relative_; }
    inline const QObject *sender() const { return sender_; }
    inline int signalId() const { return signalId_; }
    inline void **args() const { return args_; }

    virtual void placeMetaCall(QObject *object);

private:
    QtPrivate::QSlotObjectBase *slotObj_;
    const QObject *sender_;
    int signalId_;
    int nargs_;
    int *types_;
    void **args_;
    QSemaphore *semaphore_;
    QObjectPrivate::StaticMetaCallFunction callFunction_;
    ushort method_offset_;
    ushort method_relative_;
};

class QBoolBlocker
{
    Q_DISABLE_COPY_MOVE(QBoolBlocker)
public:
    explicit inline QBoolBlocker(bool &b, bool value=true):block(b), reset(b){block = value;}
    inline ~QBoolBlocker(){block = reset; }
private:
    bool &block;
    bool reset;
};

void Q_CORE_EXPORT qDeleteInEventHandler(QObject *o);

struct QAbstractDynamicMetaObject;
struct Q_CORE_EXPORT QDynamicMetaObjectData
{
    virtual ~QDynamicMetaObjectData();
    virtual void objectDestroyed(QObject *) { delete this; }

    virtual QAbstractDynamicMetaObject *toDynamicMetaObject(QObject *) = 0;
    virtual int metaCall(QObject *, QMetaObject::Call, int _id, void **) = 0;
};

struct Q_CORE_EXPORT QAbstractDynamicMetaObject : public QDynamicMetaObjectData, public QMetaObject
{
    ~QAbstractDynamicMetaObject();

    QAbstractDynamicMetaObject *toDynamicMetaObject(QObject *) override { return this; }
    virtual int createProperty(const char *, const char *) { return -1; }
    int metaCall(QObject *, QMetaObject::Call c, int _id, void **a) override
    { return metaCall(c, _id, a); }
    virtual int metaCall(QMetaObject::Call, int _id, void **) { return _id; } // Compat overload
};

QT_END_NAMESPACE

#endif // QOBJECT_P_H