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6** This file is part of the QtQml module of the Qt Toolkit.
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39
40#include "qqmlnotifier_p.h"
41#include "qqmlproperty_p.h"
42#include <QtCore/qdebug.h>
43#include <private/qthread_p.h>
44
45QT_BEGIN_NAMESPACE
46
47typedef void (*Callback)(QQmlNotifierEndpoint *, void **);
48
49void QQmlBoundSignal_callback(QQmlNotifierEndpoint *, void **);
50void QQmlJavaScriptExpressionGuard_callback(QQmlNotifierEndpoint *, void **);
51void QQmlVMEMetaObjectEndpoint_callback(QQmlNotifierEndpoint *, void **);
52
53static Callback QQmlNotifier_callbacks[] = {
54 nullptr,
55 QQmlBoundSignal_callback,
56 QQmlJavaScriptExpressionGuard_callback,
57 QQmlVMEMetaObjectEndpoint_callback
58};
59
60namespace {
61 struct NotifyListTraversalData {
62 NotifyListTraversalData(QQmlNotifierEndpoint *ep = nullptr)
63 : originalSenderPtr(0)
64 , disconnectWatch(nullptr)
65 , endpoint(ep)
66 {}
67
68 qintptr originalSenderPtr;
69 qintptr *disconnectWatch;
70 QQmlNotifierEndpoint *endpoint;
71 };
72}
73
74void QQmlNotifier::notify(QQmlData *ddata, int notifierIndex)
75{
76 if (QQmlNotifierEndpoint *ep = ddata->notify(notifierIndex))
77 emitNotify(ep, nullptr);
78}
79
80void QQmlNotifier::emitNotify(QQmlNotifierEndpoint *endpoint, void **a)
81{
82 QVarLengthArray<NotifyListTraversalData> stack;
83 while (endpoint) {
84 stack.append(NotifyListTraversalData(endpoint));
85 endpoint = endpoint->next;
86 }
87
88 int i = 0;
89 for (; i < stack.size(); ++i) {
90 NotifyListTraversalData &data = stack[i];
91
92 if (!data.endpoint->isNotifying()) {
93 data.endpoint->startNotifying(&data.originalSenderPtr);
94 data.disconnectWatch = &data.originalSenderPtr;
95 } else {
96 data.disconnectWatch = (qintptr *)(data.endpoint->senderPtr & ~0x1);
97 }
98 }
99
100 while (--i >= 0) {
101 NotifyListTraversalData &data = stack[i];
102 if (*data.disconnectWatch) {
103 Q_ASSERT(QQmlNotifier_callbacks[data.endpoint->callback]);
104 QQmlNotifier_callbacks[data.endpoint->callback](data.endpoint, a);
105 if (data.disconnectWatch == &data.originalSenderPtr && data.originalSenderPtr) {
106 data.endpoint->stopNotifying(&data.originalSenderPtr);
107 }
108 }
109 }
110}
111
112/*! \internal
113 \a sourceSignal MUST be in the signal index range (see QObjectPrivate::signalIndex()).
114 This is different from QMetaMethod::methodIndex().
115*/
116void QQmlNotifierEndpoint::connect(QObject *source, int sourceSignal, QQmlEngine *engine, bool doNotify)
117{
118 disconnect();
119
120 Q_ASSERT(engine);
121 if (QObjectPrivate::get(source)->threadData->threadId.loadRelaxed() !=
122 QObjectPrivate::get(engine)->threadData->threadId.loadRelaxed()) {
123
124 QString sourceName;
125 QDebug(&sourceName) << source;
126 sourceName = sourceName.left(sourceName.length() - 1);
127 QString engineName;
128 QDebug(&engineName).nospace() << engine;
129 engineName = engineName.left(engineName.length() - 1);
130
131 qFatal("QQmlEngine: Illegal attempt to connect to %s that is in"
132 " a different thread than the QML engine %s.", qPrintable(sourceName),
133 qPrintable(engineName));
134 }
135
136 setSender(qintptr(source));
137 this->sourceSignal = sourceSignal;
138 QQmlPropertyPrivate::flushSignal(source, sourceSignal);
139 QQmlData *ddata = QQmlData::get(source, true);
140 ddata->addNotify(sourceSignal, this);
141 if (doNotify) {
142 needsConnectNotify = doNotify;
143 QObjectPrivate * const priv = QObjectPrivate::get(source);
144 priv->connectNotify(QMetaObjectPrivate::signal(source->metaObject(), sourceSignal));
145 }
146}
147
148QT_END_NAMESPACE
149
150