C++ QObject::metaObject方法代码示例

error *objectConnect(QObject_ *object, const char *signal, int signalLen, QQmlEngine_ *engine, void *func, int argsLen)
{
    QObject *qobject = reinterpret_cast<QObject *>(object);
    QQmlEngine *qengine = reinterpret_cast<QQmlEngine *>(engine);
    QByteArray qsignal(signal, signalLen);

    const QMetaObject *meta = qobject->metaObject();
    // Walk backwards so descendants have priority.
    for (int i = meta->methodCount()-1; i >= 0; i--) {
            QMetaMethod method = meta->method(i);
            if (method.methodType() == QMetaMethod::Signal) {
                QByteArray name = method.name();
                if (name.length() == signalLen && qstrncmp(name.constData(), signal, signalLen) == 0) {
                    if (method.parameterCount() < argsLen) {
                        // TODO Might continue looking to see if a different signal has the same name and enough arguments.
                        return errorf("signal \"%s\" has too few parameters for provided function", name.constData());
                    }
                    Connector *connector = new Connector(qobject, method, qengine, func, argsLen);
                    const QMetaObject *connmeta = connector->metaObject();
                    QObject::connect(qobject, method, connector, connmeta->method(connmeta->methodOffset()));
                    return 0;
                }
            }
    }
    // Cannot use constData here as the byte array is not null-terminated.
    return errorf("object does not expose a \"%s\" signal", qsignal.data());
}

/*!
  Returns the value of the \a name property for this context
  as a QVariant.
 */
QVariant QQmlContext::contextProperty(const QString &name) const
{
    Q_D(const QQmlContext);
    QVariant value;
    int idx = -1;

    QQmlContextData *data = d->data;

    const QV4::IdentifierHash<int> &properties = data->propertyNames();
    if (properties.count())
        idx = properties.value(name);

    if (idx == -1) {
        if (data->contextObject) {
            QObject *obj = data->contextObject;
            QQmlPropertyData local;
            QQmlPropertyData *property =
                QQmlPropertyCache::property(data->engine, obj, name, data, local);

            if (property) value = obj->metaObject()->property(property->coreIndex()).read(obj);
        }
        if (!value.isValid() && parentContext())
            value = parentContext()->contextProperty(name);
    } else {
        if (idx >= d->propertyValues.count())
            value = QVariant::fromValue(data->idValues[idx - d->propertyValues.count()].data());
        else
            value = d->propertyValues[idx];
    }

    return value;
}

int SignalProxy::SignalRelay::qt_metacall(QMetaObject::Call _c, int _id, void **_a) {
  _id = QObject::qt_metacall(_c, _id, _a);
  if(_id < 0)
    return _id;

  if(_c == QMetaObject::InvokeMetaMethod) {
    if(_slots.contains(_id)) {
      QObject *caller = sender();

      SignalProxy::ExtendedMetaObject *eMeta = proxy()->extendedMetaObject(caller->metaObject());
      Q_ASSERT(eMeta);

      const Signal &signal = _slots[_id];

      QVariantList params;
      params << signal.signature;

      const QList<int> &argTypes = eMeta->argTypes(signal.signalId);
      for(int i = 0; i < argTypes.size(); i++) {
	if(argTypes[i] == 0) {
	  qWarning() << "SignalRelay::qt_metacall(): received invalid data for argument number" << i << "of signal" << QString("%1::%2").arg(caller->metaObject()->className()).arg(caller->metaObject()->method(_id).signature());
	  qWarning() << "                            - make sure all your data types are known by the Qt MetaSystem";
	  return _id;
	}
	params << QVariant(argTypes[i], _a[i+1]);
      }

      proxy()->dispatchSignal(SignalProxy::RpcCall, params);
    }
    _id -= _slots.count();
  }
  return _id;
}

void BibleTime::slotDebugTimeout() {
    QMutexLocker lock(&m_debugWindowLock);
    if (m_debugWindow == 0 || m_debugWindow->isVisible() == false) return;

    QTimer::singleShot(0, this, SLOT(slotDebugTimeout()));
    QObject *w = QApplication::widgetAt(QCursor::pos());
    if (w != 0) {
        QString objectHierarchy;
        do {
            const QMetaObject *m = w->metaObject();
            QString classHierarchy;
            do {
                if (!classHierarchy.isEmpty()) classHierarchy += ": ";
                classHierarchy += m->className();

                m = m->superClass();
            } while (m != 0);
            if (!objectHierarchy.isEmpty()) {
                objectHierarchy += "<br/><b>child of:</b> ";
            } else {
                objectHierarchy += "<b>This widget is:</b> ";
            }
            objectHierarchy += classHierarchy;
            w = w->parent();
        } while (w != 0);
        m_debugWindow->setText(objectHierarchy);
    } else {
        m_debugWindow->setText("No widget");
    }
    m_debugWindow->resize(m_debugWindow->minimumSizeHint());
}

ParamEnum::ParamEnum( QObject *parent, const char* name, int value, const QString& e, int *ptr ) 
    : AbstractParam(parent, name, QVariant::Int)
{
    m_ptr = ptr;

    QStringList L = e.split('|', QString::SkipEmptyParts);
    if (!L.isEmpty()) {
        for (int i = 0; i < L.size(); ++i) {
            m_keys.append(L[i]);
            m_values.append(i);
        }
    } else {
        QObject *p = parent;
        while (p) {
            const QMetaObject *mo = p->metaObject();
            int index = mo->indexOfEnumerator(e.toLatin1().data());
            if (index >= 0) {
                const QMetaEnum me = mo->enumerator(index);
                for (int i = 0; i < me.keyCount(); ++i) {
                    m_keys.append(me.key(i));
                    m_values.append(me.value(i));
                }
                break;
            }
            p = p->parent();
        }
    }

    m_value = m_defaultValue = value;
    if (m_ptr) *m_ptr = m_value;
}

void collectReachableMetaObjects(QObject *object, QSet<const QMetaObject *> *metas)
{
    if (! object)
        return;

    const QMetaObject *meta = object->metaObject();
    if (verbose)
        qDebug() << "Processing object" << meta->className();
    collectReachableMetaObjects(meta, metas);

    for (int index = 0; index < meta->propertyCount(); ++index) {
        QMetaProperty prop = meta->property(index);
        if (QQmlMetaType::isQObject(prop.userType())) {
            if (verbose)
                qDebug() << "  Processing property" << prop.name();
            currentProperty = QString("%1::%2").arg(meta->className(), prop.name());

            // if the property was not initialized during construction,
            // accessing a member of oo is going to cause a segmentation fault
            QObject *oo = QQmlMetaType::toQObject(prop.read(object));
            if (oo && !metas->contains(oo->metaObject()))
                collectReachableMetaObjects(oo, metas);
            currentProperty.clear();
        }
    }
}

void QtInstance::getPropertyNames(ExecState* exec, PropertyNameArray& array)
{
    // This is the enumerable properties, so put:
    // properties
    // dynamic properties
    // slots
    QObject* obj = getObject();
    if (obj) {
        const QMetaObject* meta = obj->metaObject();

        int i;
        for (i = 0; i < meta->propertyCount(); i++) {
            QMetaProperty prop = meta->property(i);
            if (prop.isScriptable())
                array.add(Identifier(exec, prop.name()));
        }

#ifndef QT_NO_PROPERTIES
        QList<QByteArray> dynProps = obj->dynamicPropertyNames();
        foreach (const QByteArray& ba, dynProps)
            array.add(Identifier(exec, ba.constData()));
#endif

        const int methodCount = meta->methodCount();
        for (i = 0; i < methodCount; i++) {
            QMetaMethod method = meta->method(i);
            if (method.access() != QMetaMethod::Private)
                array.add(Identifier(exec, method.signature()));
        }
    }
}

QStringList QDeclarativeObjectScriptClass::propertyNames(Object *object)
{
    QObject *obj = toQObject(object);
    if (!obj)
        return QStringList();

    QDeclarativeEnginePrivate *enginePrivate = QDeclarativeEnginePrivate::get(engine);

    QDeclarativePropertyCache *cache = 0;
    QDeclarativeData *ddata = QDeclarativeData::get(obj);
    if (ddata)
        cache = ddata->propertyCache;
    if (!cache) {
        cache = enginePrivate->cache(obj);
        if (cache) {
            if (ddata) { cache->addref(); ddata->propertyCache = cache; }
        } else {
            // Not cachable - fall back to QMetaObject (eg. dynamic meta object)
            // XXX QDeclarativeOpenMetaObject has a cache, so this is suboptimal.
            // XXX This is a workaround for QTBUG-9420.
            const QMetaObject *mo = obj->metaObject();
            QStringList r;
            int pc = mo->propertyCount();
            int po = mo->propertyOffset();
            for (int i=po; i<pc; ++i)
                r += QString::fromUtf8(mo->property(i).name());
            return r;
        }
    }
    return cache->propertyNames();
}

bool QtOnChangeWithKeepAliveSubscriptionQos::equals(const QObject& other) const
{
    int typeThis = QMetaType::type(this->metaObject()->className());
    int typeOther = QMetaType::type(other.metaObject()->className());
    auto newOther = dynamic_cast<const QtOnChangeWithKeepAliveSubscriptionQos*>(&other);
    return typeThis == typeOther && *this == *newOther;
}

void SignalTransition::connectTriggered()
{
    if (!m_complete || !m_cdata)
        return;

    QObject *target = senderObject();
    QQmlData *ddata = QQmlData::get(this);
    QQmlContextData *ctxtdata = ddata ? ddata->outerContext : 0;

    Q_ASSERT(m_bindings.count() == 1);
    const QV4::CompiledData::Binding *binding = m_bindings.at(0);
    Q_ASSERT(binding->type == QV4::CompiledData::Binding::Type_Script);

    QV4::ExecutionEngine *jsEngine = QV8Engine::getV4(QQmlEngine::contextForObject(this)->engine());
    QV4::Scope scope(jsEngine);
    QV4::Scoped<QV4::QObjectMethod> qobjectSignal(scope, QJSValuePrivate::convertedToValue(jsEngine, m_signal));
    Q_ASSERT(qobjectSignal);
    QMetaMethod metaMethod = target->metaObject()->method(qobjectSignal->methodIndex());
    int signalIndex = QMetaObjectPrivate::signalIndex(metaMethod);

    QQmlBoundSignalExpression *expression = ctxtdata ?
                new QQmlBoundSignalExpression(target, signalIndex,
                                              ctxtdata, this, m_cdata->compilationUnit->runtimeFunctions[binding->value.compiledScriptIndex]) : 0;
    if (expression)
        expression->setNotifyOnValueChanged(false);
    m_signalExpression = expression;
}

StyleSet::StyleSet(QObject* pParent)
  : QObject(pParent)
  , mpStyleSetProps(StyleSetProps::nullStyleSetProps())
{
  auto* pEngine = StyleEngineHost::globalStyleEngine();

  QObject* p = parent();
  if (p) {
    QQuickItem* pItem = qobject_cast<QQuickItem*>(p);
    if (pItem != nullptr) {
      connect(pItem, &QQuickItem::parentChanged, this, &StyleSet::onParentChanged);
    } else if (p->parent() != nullptr) {
      styleSheetsLogInfo() << "Parent to StyleSet is not a QQuickItem but '"
                           << p->metaObject()->className() << "'. "
                           << "Hierarchy changes for this component won't be detected.";

      if (pEngine) {
        Q_EMIT pEngine->exception(
          QString::fromLatin1("noParentChangeReports"),
          QString::fromLatin1("Hierarchy changes for this component won't be detected"));
      }
    }

    mPath = traversePathUp(p);

    if (!pEngine) {
      connect(StyleEngineHost::globalStyleEngineHost(),
              &StyleEngineHost::styleEngineLoaded, this, &StyleSet::onStyleEngineLoaded);
    }

    setupStyle();
  }
}

static int lqtL_connect(lua_State *L) {
    static int methodId = 0;

    QObject* sender = static_cast<QObject*>(lqtL_toudata(L, 1, "QObject*"));
    if (sender == NULL)
        return luaL_argerror(L, 1, "sender not QObject*");

    const char *signal = luaL_checkstring(L, 2);
    const QMetaObject *senderMeta = sender->metaObject();
    int idxS = senderMeta->indexOfSignal(signal + 1);
    if (idxS == -1)
        return luaL_argerror(L, 2, qPrintable(QString("no such sender signal: '%1'").arg(signal + 1)));

    QObject* receiver;
    QString methodName;

    if (lua_type(L, 3) == LUA_TFUNCTION) {
        receiver = sender;

        // simulate sender:__addmethod('LQT_SLOT_X(signature)', function()...end)
        QMetaMethod m = senderMeta->method(idxS);
        methodName = QString(m.signature()).replace(QRegExp("^[^\\(]+"), QString("LQT_SLOT_%1").arg(methodId++));

        lua_getfield(L, 1, "__addmethod");
        lua_pushvalue(L, 1);
        lua_pushstring(L, qPrintable(methodName));
        lua_pushvalue(L, 3);
        lua_call(L, 3, 0);
        
        methodName.prepend("1");
    } else {
        receiver = static_cast<QObject*>(lqtL_toudata(L, 3, "QObject*"));
        if (receiver == NULL)
            return luaL_argerror(L, 3, "receiver not QObject*");
        const char *method = luaL_checkstring(L, 4);
        methodName = method;

        const QMetaObject *receiverMeta = receiver->metaObject();
        int idxR = receiverMeta->indexOfMethod(method + 1);
        if (idxR == -1)
            return luaL_argerror(L, 4, qPrintable(QString("no such receiver method: '%1'").arg(method + 1)));
    }

    bool ok = QObject::connect(sender, signal, receiver, qPrintable(methodName));
    lua_pushboolean(L, ok);
    return 1;
}

JSValue QtInstance::stringValue(ExecState* exec) const
{
    QObject* obj = getObject();
    if (!obj)
        return jsNull();

    // Hmm.. see if there is a toString defined
    QByteArray buf;
    bool useDefault = true;
    getClass();
    if (m_class) {
        // Cheat and don't use the full name resolution
        int index = obj->metaObject()->indexOfMethod("toString()");
        if (index >= 0) {
            QMetaMethod m = obj->metaObject()->method(index);
            // Check to see how much we can call it
            if (m.access() != QMetaMethod::Private
                && m.methodType() != QMetaMethod::Signal
                && m.parameterTypes().isEmpty()) {
                const char* retsig = m.typeName();
                if (retsig && *retsig) {
                    QVariant ret(QMetaType::type(retsig), (void*)0);
                    void * qargs[1];
                    qargs[0] = ret.data();

                    if (QMetaObject::metacall(obj, QMetaObject::InvokeMetaMethod, index, qargs) < 0) {
                        if (ret.isValid() && ret.canConvert(QVariant::String)) {
                            buf = ret.toString().toLatin1().constData(); // ### Latin 1? Ascii?
                            useDefault = false;
                        }
                    }
                }
            }
        }
    }

    if (useDefault) {
        const QMetaObject* meta = obj ? obj->metaObject() : &QObject::staticMetaObject;
        QString name = obj ? obj->objectName() : QString::fromUtf8("unnamed");
        QString str = QString::fromUtf8("%0(name = \"%1\")")
                      .arg(QLatin1String(meta->className())).arg(name);

        buf = str.toLatin1();
    }
    return jsString(exec, buf.constData());
}

void mafObjectFactoryTest::instantiateQObjectFromStringTest() {
    mafRegisterQtObject(QObject);
    QObject *obj = mafNEWQtFromString("QObject");
    QVERIFY(obj != NULL);
    QString cn = obj->metaObject()->className();
    QVERIFY(cn == "QObject");
    delete obj;
}

// Connect up a particular slot name, with optional arguments.
static void connect(QObject *qobj, PyObject *slot_obj,
        const QByteArray &slot_nm, const QByteArray &args)
{
    // Ignore if it's not an autoconnect slot.
    if (!slot_nm.startsWith("on_"))
        return;

    // Extract the names of the emitting object and the signal.
    int i;

    i = slot_nm.lastIndexOf('_');

    if (i - 3 < 1 || i + 1 >= slot_nm.size())
        return;

    QByteArray ename = slot_nm.mid(3, i - 3);
    QByteArray sname = slot_nm.mid(i + 1);

    // Find the emitting object and get its meta-object.
    QObject *eobj = qobj->findChild<QObject *>(ename);

    if (!eobj)
        return;

    const QMetaObject *mo = eobj->metaObject();

    // Got through the methods looking for a matching signal.
    for (int m = 0; m < mo->methodCount(); ++m)
    {
        QMetaMethod mm = mo->method(m);

        if (mm.methodType() != QMetaMethod::Signal)
            continue;

        QByteArray sig(mm.methodSignature());

        if (Chimera::Signature::name(sig) != sname)
            continue;

        // If we have slot arguments then they must match as well.
        if (!args.isEmpty() && Chimera::Signature::arguments(sig) != args)
            continue;

        QObject *receiver;
        QByteArray slot_sig;

        if (pyqt5_get_connection_parts(slot_obj, eobj, sig.constData(), false, &receiver, slot_sig) != sipErrorNone)
            continue;

        // Add the type character.
        sig.prepend('2');

        // Connect the signal.
        QObject::connect(eobj, sig.constData(), receiver, slot_sig.constData());
    }
}