QMetaObject Class Reference

\inmodule QtCore More...

#include <qobjectdefs.h>

Inheritance diagram for QMetaObject:

Collaboration diagram for QMetaObject:

Classes
struct	Data
struct	SuperData

Public Types
enum	Call {   InvokeMetaMethod , ReadProperty , WriteProperty , ResetProperty ,   CreateInstance , IndexOfMethod , RegisterPropertyMetaType , RegisterMethodArgumentMetaType ,   BindableProperty , CustomCall , ConstructInPlace }
typedef void *Connection::*	RestrictedBool

Public Member Functions
const char *	className () const
	Returns the class name.
const QMetaObject *	superClass () const
	Returns the meta-object of the superclass, or \nullptr if there is no such object.
bool	inherits (const QMetaObject *metaObject) const noexcept
	Returns true if the class described by this QMetaObject inherits the type described by metaObject; otherwise returns false.
QObject *	cast (QObject *obj) const
const QObject *	cast (const QObject *obj) const
QString	tr (const char *s, const char *c, int n=-1) const
QMetaType	metaType () const
int	methodOffset () const
	Returns the method offset for this class; i.e.
int	enumeratorOffset () const
	Returns the enumerator offset for this class; i.e.
int	propertyOffset () const
	Returns the property offset for this class; i.e.
int	classInfoOffset () const
	Returns the class information offset for this class; i.e.
int	constructorCount () const
int	methodCount () const
	Returns the number of methods in this class, including the number of methods provided by each base class.
int	enumeratorCount () const
	Returns the number of enumerators in this class.
int	propertyCount () const
	Returns the number of properties in this class, including the number of properties provided by each base class.
int	classInfoCount () const
	Returns the number of items of class information in this class.
int	indexOfConstructor (const char *constructor) const
int	indexOfMethod (const char *method) const
	Finds method and returns its index; otherwise returns -1.
int	indexOfSignal (const char *signal) const
	Finds signal and returns its index; otherwise returns -1.
int	indexOfSlot (const char *slot) const
	Finds slot and returns its index; otherwise returns -1.
int	indexOfEnumerator (const char *name) const
	Finds enumerator name and returns its index; otherwise returns -1.
int	indexOfProperty (const char *name) const
	Finds property name and returns its index; otherwise returns -1.
int	indexOfClassInfo (const char *name) const
	Finds class information item name and returns its index; otherwise returns -1.
QMetaMethod	constructor (int index) const
QMetaMethod	method (int index) const
	Returns the meta-data for the method with the given index.
QMetaEnum	enumerator (int index) const
	Returns the meta-data for the enumerator with the given index.
QMetaProperty	property (int index) const
	Returns the meta-data for the property with the given index.
QMetaClassInfo	classInfo (int index) const
	Returns the meta-data for the item of class information with the given index.
QMetaProperty	userProperty () const
template<typename... Args>
QtPrivate::Invoke::IfNotOldStyleArgs< QObject *, Args... >	newInstance (Args &&... arguments) const
int	static_metacall (Call, int, void **) const
	~Connection ()
	Connection ()
	Connection (const Connection &other)
Connection &	operator= (const Connection &other)
	operator RestrictedBool () const
	Connection (Connection &&other) noexcept
void	swap (Connection &other) noexcept

Static Public Member Functions
static bool	checkConnectArgs (const char *signal, const char *method)
	Returns true if the signal and method arguments are compatible; otherwise returns false.
static bool	checkConnectArgs (const QMetaMethod &signal, const QMetaMethod &method)
static QByteArray	normalizedSignature (const char *method)
	Normalizes the signature of the given method.
static QByteArray	normalizedType (const char *type)
static Connection	connect (const QObject *sender, int signal_index, const QObject *receiver, int method_index, int type=0, int *types=nullptr)
static bool	disconnect (const QObject *sender, int signal_index, const QObject *receiver, int method_index)
static bool	disconnectOne (const QObject *sender, int signal_index, const QObject *receiver, int method_index)
static void	connectSlotsByName (QObject *o)
	Searches recursively for all child objects of the given object, and connects matching signals from them to slots of object that follow the following form:
static void	activate (QObject *sender, int signal_index, void **argv)
static void	activate (QObject *sender, const QMetaObject *, int local_signal_index, void **argv)
static void	activate (QObject *sender, int signal_offset, int local_signal_index, void **argv)
static bool	invokeMethod (QObject *obj, const char *member, Qt::ConnectionType, QGenericReturnArgument ret, QGenericArgument val0=QGenericArgument(nullptr), QGenericArgument val1=QGenericArgument(), QGenericArgument val2=QGenericArgument(), QGenericArgument val3=QGenericArgument(), QGenericArgument val4=QGenericArgument(), QGenericArgument val5=QGenericArgument(), QGenericArgument val6=QGenericArgument(), QGenericArgument val7=QGenericArgument(), QGenericArgument val8=QGenericArgument(), QGenericArgument val9=QGenericArgument())
	\threadsafe This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. \obsolete [6.5] Please use the variadic overload of this function
static bool	invokeMethod (QObject *obj, const char *member, QGenericReturnArgument ret, QGenericArgument val0=QGenericArgument(nullptr), QGenericArgument val1=QGenericArgument(), QGenericArgument val2=QGenericArgument(), QGenericArgument val3=QGenericArgument(), QGenericArgument val4=QGenericArgument(), QGenericArgument val5=QGenericArgument(), QGenericArgument val6=QGenericArgument(), QGenericArgument val7=QGenericArgument(), QGenericArgument val8=QGenericArgument(), QGenericArgument val9=QGenericArgument())
static bool	invokeMethod (QObject *obj, const char *member, Qt::ConnectionType type, QGenericArgument val0, QGenericArgument val1=QGenericArgument(), QGenericArgument val2=QGenericArgument(), QGenericArgument val3=QGenericArgument(), QGenericArgument val4=QGenericArgument(), QGenericArgument val5=QGenericArgument(), QGenericArgument val6=QGenericArgument(), QGenericArgument val7=QGenericArgument(), QGenericArgument val8=QGenericArgument(), QGenericArgument val9=QGenericArgument())
static bool	invokeMethod (QObject *obj, const char *member, QGenericArgument val0, QGenericArgument val1=QGenericArgument(), QGenericArgument val2=QGenericArgument(), QGenericArgument val3=QGenericArgument(), QGenericArgument val4=QGenericArgument(), QGenericArgument val5=QGenericArgument(), QGenericArgument val6=QGenericArgument(), QGenericArgument val7=QGenericArgument(), QGenericArgument val8=QGenericArgument(), QGenericArgument val9=QGenericArgument())
template<typename... Args>
static QtPrivate::Invoke::IfNotOldStyleArgs< bool, Args... >	invokeMethod (QObject *obj, const char *member, Qt::ConnectionType c, QMetaMethodReturnArgument r, Args &&... arguments)
template<typename... Args>
static QtPrivate::Invoke::IfNotOldStyleArgs< bool, Args... >	invokeMethod (QObject *obj, const char *member, Qt::ConnectionType c, Args &&... arguments)
template<typename... Args>
static QtPrivate::Invoke::IfNotOldStyleArgs< bool, Args... >	invokeMethod (QObject *obj, const char *member, QMetaMethodReturnArgument r, Args &&... arguments)
template<typename... Args>
static QtPrivate::Invoke::IfNotOldStyleArgs< bool, Args... >	invokeMethod (QObject *obj, const char *member, Args &&... arguments)
template<typename Func >
static std::enable_if_t<!std::disjunction_v< std::is_convertible< Func, const char * >, QtPrivate::Invoke::AreOldStyleArgs< Func > >, bool >	invokeMethod (typename QtPrivate::ContextTypeForFunctor< Func >::ContextType *object, Func &&function, Qt::ConnectionType type=Qt::AutoConnection, typename QtPrivate::Callable< Func >::ReturnType *ret=nullptr)
template<typename Func >
static std::enable_if_t<!std::disjunction_v< std::is_convertible< Func, const char * >, QtPrivate::Invoke::AreOldStyleArgs< Func > >, bool >	invokeMethod (typename QtPrivate::ContextTypeForFunctor< Func >::ContextType *object, Func &&function, typename QtPrivate::Callable< Func >::ReturnType *ret)
static int	metacall (QObject *, Call, int, void **)
template<const QMetaObject & MO>
static constexpr const QMetaObject *	staticMetaObject ()

Public Attributes
struct QMetaObject::Data	d

Friends
class	QTimer
class	QObject
class	QObjectPrivate
struct	QMetaObject

Detailed Description

\inmodule QtCore

The QMetaObject class contains meta-information about Qt objects.

The Qt \l{Meta-Object System} in Qt is responsible for the signals and slots inter-object communication mechanism, runtime type information, and the Qt property system. A single QMetaObject instance is created for each QObject subclass that is used in an application, and this instance stores all the meta-information for the QObject subclass. This object is available as QObject::metaObject().

This class is not normally required for application programming, but it is useful if you write meta-applications, such as scripting engines or GUI builders.

The functions you are most likely to find useful are these: \list

• className() returns the name of a class.
• superClass() returns the superclass's meta-object.
• method() and methodCount() provide information about a class's meta-methods (signals, slots and other \l{Q_INVOKABLE}{invokable} member functions).
• enumerator() and enumeratorCount() and provide information about a class's enumerators.
• propertyCount() and property() provide information about a class's properties.
• constructor() and constructorCount() provide information about a class's meta-constructors. \endlist

The index functions indexOfConstructor(), indexOfMethod(), indexOfEnumerator(), and indexOfProperty() map names of constructors, member functions, enumerators, or properties to indexes in the meta-object. For example, Qt uses indexOfMethod() internally when you connect a signal to a slot.

Classes can also have a list of {name}–{value} pairs of additional class information, stored in QMetaClassInfo objects. The number of pairs is returned by classInfoCount(), single pairs are returned by classInfo(), and you can search for pairs with indexOfClassInfo().

Note

Operations that use the meta object system are generally thread- safe, as QMetaObjects are typically static read-only instances generated at compile time. However, if meta objects are dynamically modified by the application (for instance, when using QQmlPropertyMap), then the application has to explicitly synchronize access to the respective meta object.

See also

QMetaClassInfo, QMetaEnum, QMetaMethod, QMetaProperty, QMetaType, {Meta-Object System}

Definition at line 225 of file qobjectdefs.h.

Member Typedef Documentation

RestrictedBool

typedef void* Connection::* QMetaObject::RestrictedBool

Definition at line 553 of file qobjectdefs.h.

Member Enumeration Documentation

Call

enum QMetaObject::Call

\value InvokeMetaMethod \value ReadProperty \value WriteProperty \value ResetProperty \value CreateInstance \value IndexOfMethod \value RegisterPropertyMetaType \value RegisterMethodArgumentMetaType \value BindableProperty \value CustomCall \value ConstructInPlace

Enumerator
InvokeMetaMethod
ReadProperty
WriteProperty
ResetProperty
CreateInstance
IndexOfMethod
RegisterPropertyMetaType
RegisterMethodArgumentMetaType
BindableProperty
CustomCall
ConstructInPlace

Definition at line 467 of file qobjectdefs.h.

Constructor & Destructor Documentation

~Connection()

QMetaObject::~Connection

(

)

Member Function Documentation

activate() [1/3]

void QMetaObject::activate ( QObject *  sender, const QMetaObject *  m, int  local_signal_index, void **  argv  )

static

Definition at line 4029 of file qobject.cpp.

References Q_UNLIKELY, qt_signal_spy_callback_set, and QMetaObjectPrivate::signalOffset().

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activate() [2/3]

void QMetaObject::activate ( QObject *  sender, int  signal_index, void **  argv  )

static

signal_index comes from indexOfMethod()

Definition at line 4057 of file qobject.cpp.

References mo.

Referenced by QQmlVMEMetaObject::activate(), QQmlOpenMetaObject::checkedSetValue(), QQmlContextPrivate::dropDestroyedQObject(), VDMListDelegateDataType::emitAllSignals(), QQmlDelegateModelAttached::emitChanges(), QQmlOpenMetaObject::emitPropertyNotification(), QDBusInterfacePrivate::metacall(), QQmlDMAbstractItemModelData::metaCall(), QQmlOpenMetaObject::metaCall(), QQmlProxyMetaObject::metaCall(), QQmlDMObjectDataMetaObject::metaCall(), VDMListDelegateDataType::metaCall(), VDMAbstractItemModelDataType::notify(), QQmlDMAbstractItemModelData::resolveIndex(), QQmlDMAbstractItemModelData::set_property(), QQmlContext::setContextProperty(), QQmlDMAbstractItemModelData::setModelData(), QQmlDesignerMetaObject::setValue(), and QQmlOpenMetaObject::setValue().

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activate() [3/3]

void QMetaObject::activate ( QObject *  sender, int  signalOffset, int  local_signal_index, void **  argv  )

static

Definition at line 4043 of file qobject.cpp.

References Q_UNLIKELY, and qt_signal_spy_callback_set.

cast() [1/2]

const QObject * QMetaObject::cast

(

const QObject *

obj

)

const

Returns obj if object obj inherits from this meta-object; otherwise returns \nullptr.

Definition at line 393 of file qmetaobject.cpp.

cast() [2/2]

QObject * QMetaObject::cast ( QObject *  obj ) const

inline

Returns obj if object obj inherits from this meta-object; otherwise returns \nullptr.

Definition at line 232 of file qobjectdefs.h.

Referenced by convertMetaObject(), and QQmlPropertyPrivate::write().

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checkConnectArgs() [1/2]

bool QMetaObject::checkConnectArgs ( const char *  signal, const char *  method  )

static

Returns true if the signal and method arguments are compatible; otherwise returns false.

Both signal and method are expected to be normalized.

See also

normalizedSignature()

Definition at line 1265 of file qmetaobject.cpp.

References method, qstrcmp(), qstrlen(), s2, and signal.

Referenced by QObject::connect(), and signalForMember().

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checkConnectArgs() [2/2]

bool QMetaObject::checkConnectArgs ( const QMetaMethod &  signal, const QMetaMethod &  method  )

static

Since

5.0 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Returns true if the signal and method arguments are compatible; otherwise returns false.

Definition at line 1287 of file qmetaobject.cpp.

References QMetaObjectPrivate::checkConnectArgs(), method, and signal.

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classInfo()

QMetaClassInfo QMetaObject::classInfo

(

int

index

)

const

Returns the meta-data for the item of class information with the given index.

Example:

class MyClass : public QObject
{
    Q_OBJECT
    Q_CLASSINFO("author", "Sabrina Schweinsteiger")
    Q_CLASSINFO("url", "http://doc.moosesoft.co.uk/1.0/")
 
public:
    ...
};

See also

classInfoCount(), classInfoOffset(), indexOfClassInfo()

Definition at line 1242 of file qmetaobject.cpp.

References classInfo(), QMetaObjectPrivate::classInfoCount, QMetaObjectPrivate::classInfoData, classInfoOffset(), d, QMetaObject::Data::data, i, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), and classInfo().

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classInfoCount()

int QMetaObject::classInfoCount

(

)

const

Returns the number of items of class information in this class.

See also

classInfo(), classInfoOffset(), indexOfClassInfo()

Definition at line 619 of file qmetaobject.cpp.

References QMetaObjectPrivate::classInfoCount, d, QMetaObject::Data::data, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), and QQmlMetaType::clone().

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classInfoOffset()

int QMetaObject::classInfoOffset

(

)

const

Returns the class information offset for this class; i.e.

the index position of this class's first class information item.

If the class has no superclasses with class information, the offset is 0; otherwise the offset is the sum of all the class information items in the class's superclasses.

See also

classInfo(), classInfoCount(), indexOfClassInfo()

Definition at line 529 of file qmetaobject.cpp.

References QMetaObjectPrivate::classInfoCount, d, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), classInfo(), and QQmlMetaType::clone().

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className()

const char * QMetaObject::className

(

)

const

Returns the class name.

See also

superClass()

Definition at line 347 of file qmetaobject.cpp.

References objectClassName().

Referenced by QMetaObjectBuilder::addMetaObject(), check_and_warn_compat(), QQmlMetaObject::className(), QObject::connect(), connectWarning(), QObject::dumpObjectInfo(), findAttachedParent(), QApplication::font(), QQmlOpenMetaObjectTypePrivate::init(), metaType(), msgConnect(), printMethodNotFoundWarning(), QTest::qPrintDataTags(), QDBusAdaptorConnector::relay(), QQmlType::typeName(), QQuick3DCustomMaterial::updateSpatialNode(), and QQuick3DEffect::updateSpatialNode().

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connect()

QMetaObject::Connection QMetaObject::connect ( const QObject *  sender, int  signal_index, const QObject *  receiver, int  method_index, int  type = 0, int *  types = nullptr  )

static

types is a 0-terminated vector of meta types for queued connections.

if signal_index is -1, then we effectively connect all signals from the sender to the receiver's slot

Definition at line 3419 of file qobject.cpp.

References QMetaObjectPrivate::connect(), and methodIndexToSignalIndex().

Referenced by QQmlPropertyPrivate::connect(), QDBusAdaptorConnector::connectAllSignals(), QQuickPixmap::connectDownloadProgress(), QQuickPixmap::connectFinished(), QQuickContainer::contentItemChange(), QQmlSettingsPrivate::load(), QWidgetTextControlPrivate::setContent(), and QQuickRectangle::setGradient().

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Connection() [1/3]

QMetaObject::Connection

(

)

Referenced by WaylandEglClientBuffer::~WaylandEglClientBuffer(), WaylandEglStreamClientBuffer::~WaylandEglStreamClientBuffer(), LinuxDmabufWlBuffer::buffer_destroy(), QObject::connect(), QObject::connect(), QObjectPrivate::connect(), QObjectPrivate::connectImpl(), MutableModelIterator::disconnect(), and LinuxDmabufWlBuffer::initTexture().

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Connection() [2/3]

QMetaObject::Connection ( Connection &&  other )

inlinenoexcept

Definition at line 557 of file qobjectdefs.h.

Connection() [3/3]

QMetaObject::Connection

(

const Connection &

other

)

connectSlotsByName()

void QMetaObject::connectSlotsByName ( QObject *  object )

static

Searches recursively for all child objects of the given object, and connects matching signals from them to slots of object that follow the following form:

void on_<object name>_<signal name>(<signal parameters>);

Let's assume our object has a child object of type {QPushButton} with the \l{QObject::objectName}{object name} {button1}. The slot to catch the button's {clicked()} signal would be:

void on_button1_clicked();

If object itself has a properly set object name, its own signals are also connected to its respective slots.

See also

QObject::setObjectName()

Definition at line 3670 of file qobject.cpp.

References QMetaObjectPrivate::absoluteSignalCount(), QList< T >::at(), QMetaMethod::Cloned, QMetaObjectPrivate::connect(), QByteArray::constData(), i, QByteArray::indexOf(), QByteArray::isEmpty(), j, QByteArray::lastIndexOf(), list, method, mo, msgConnect(), o, QObject::objectName, QList< T >::prepend(), Q_ASSERT, qCDebug, qCWarning, qstrlen(), qstrncmp(), QMetaObjectPrivate::signal(), signal, QByteArray::size(), QList< T >::size(), and QString::toLatin1().

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constructor()

QMetaMethod QMetaObject::constructor

(

int

index

)

const

Since

4.5

Returns the meta-data for the constructor with the given index.

See also

constructorCount(), newInstance()

Definition at line 1154 of file qmetaobject.cpp.

References QMetaObjectPrivate::constructorCount, d, QMetaObject::Data::data, i, and priv().

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaObject::constructorParameterTypes(), fromMatchingType(), fromVerifiedType(), and indexOfConstructor().

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constructorCount()

int QMetaObject::constructorCount

(

)

const

Since

4.5

Returns the number of constructors in this class.

See also

constructor(), indexOfConstructor()

Definition at line 547 of file qmetaobject.cpp.

References QMetaObjectPrivate::constructorCount, d, QMetaObject::Data::data, priv(), Q_ASSERT, and QMetaObjectPrivate::revision.

Referenced by QMetaObjectBuilder::addMetaObject(), and fromMatchingType().

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disconnect()

bool QMetaObject::disconnect ( const QObject *  sender, int  signal_index, const QObject *  receiver, int  method_index  )

static

Definition at line 3504 of file qobject.cpp.

References QMetaObjectPrivate::disconnect(), and methodIndexToSignalIndex().

Referenced by QQuickContainer::contentItemChange(), QDBusAdaptorConnector::disconnectAllSignals(), QWidgetTextControlPrivate::setContent(), and QQuickRectangle::setGradient().

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disconnectOne()

bool QMetaObject::disconnectOne ( const QObject *  sender, int  signal_index, const QObject *  receiver, int  method_index  )

static

\internal

Disconnect a single signal connection. If QMetaObject::connect() has been called multiple times for the same sender, signal_index, receiver and method_index only one of these connections will be removed.

Definition at line 3520 of file qobject.cpp.

References QMetaObjectPrivate::disconnect(), QMetaObjectPrivate::DisconnectOne, and methodIndexToSignalIndex().

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enumerator()

QMetaEnum QMetaObject::enumerator

(

int

index

)

const

Returns the meta-data for the enumerator with the given index.

See also

enumeratorCount(), enumeratorOffset(), indexOfEnumerator()

Definition at line 1184 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, enumerator(), QMetaObjectPrivate::enumeratorCount, enumeratorOffset(), i, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), enumerator(), formatWidgetAttributes(), qt_QMetaEnum_debugOperator(), and qt_QMetaEnum_flagDebugOperator().

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enumeratorCount()

int QMetaObject::enumeratorCount

(

)

const

Returns the number of enumerators in this class.

See also

enumerator(), enumeratorOffset(), indexOfEnumerator()

Definition at line 581 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, QMetaObjectPrivate::enumeratorCount, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), and QQmlMetaType::clone().

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enumeratorOffset()

int QMetaObject::enumeratorOffset

(

)

const

Returns the enumerator offset for this class; i.e.

the index position of this class's first enumerator.

If the class has no superclasses with enumerators, the offset is 0; otherwise the offset is the sum of all the enumerators in the class's superclasses.

See also

enumerator(), enumeratorCount(), indexOfEnumerator()

Definition at line 487 of file qmetaobject.cpp.

References d, QMetaObjectPrivate::enumeratorCount, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaType::clone(), and enumerator().

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indexOfClassInfo()

int QMetaObject::indexOfClassInfo

(

const char *

name

)

const

Finds class information item name and returns its index; otherwise returns -1.

See also

classInfo(), classInfoCount(), classInfoOffset()

Definition at line 1132 of file qmetaobject.cpp.

References QMetaObjectPrivate::classInfoCount, QMetaObjectPrivate::classInfoData, i, priv(), and rawStringData().

Referenced by QQmlMetaType::clone().

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indexOfConstructor()

int QMetaObject::indexOfConstructor

(

const char *

constructor

)

const

Since

4.5

Finds constructor and returns its index; otherwise returns -1.

Note that the constructor has to be in normalized form, as returned by normalizedSignature().

See also

constructor(), constructorCount(), normalizedSignature()

Definition at line 723 of file qmetaobject.cpp.

References constructor(), d, QMetaObject::Data::data, QMetaObjectPrivate::decodeMethodSignature(), QMetaObjectPrivate::indexOfConstructor(), priv(), Q_ASSERT, and QMetaObjectPrivate::revision.

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indexOfEnumerator()

int QMetaObject::indexOfEnumerator

(

const char *

name

)

const

Finds enumerator name and returns its index; otherwise returns -1.

See also

enumerator(), enumeratorCount(), enumeratorOffset()

Definition at line 1062 of file qmetaobject.cpp.

References d, e, i, priv(), and rawStringData().

Referenced by QQmlMetaType::clone(), formatWidgetAttributes(), qt_QMetaEnum_debugOperator(), and qt_QMetaEnum_flagDebugOperator().

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indexOfMethod()

int QMetaObject::indexOfMethod

(

const char *

method

)

const

Finds method and returns its index; otherwise returns -1.

Note that the method has to be in normalized form, as returned by normalizedSignature().

See also

method(), methodCount(), methodOffset(), normalizedSignature()

Definition at line 739 of file qmetaobject.cpp.

References QMetaObjectPrivate::decodeMethodSignature(), i, method, priv(), Q_ASSERT, and QMetaObjectPrivate::revision.

Referenced by QTextDocument::loadResource(), and maybeInvokeSetupMethod().

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indexOfProperty()

int QMetaObject::indexOfProperty

(

const char *

name

)

const

Finds property name and returns its index; otherwise returns -1.

See also

property(), propertyCount(), propertyOffset()

Definition at line 1100 of file qmetaobject.cpp.

References QAbstractDynamicMetaObject::createProperty(), d, QMetaObject::Data::data, DynamicMetaObject, QMetaObjectPrivate::flags, i, priv(), and rawStringData().

Referenced by QQmlMetaType::clone(), doWriteProperties(), QQmlPropertyPrivate::initProperty(), QObject::property(), qQmlPropertyCacheCreate(), removePendingQPropertyBinding(), VDMListDelegateDataType::setValue(), QQuickWheelHandlerPrivate::targetMetaProperty(), VDMListDelegateDataType::value(), QQuickMultiPointHandlerPrivate::xMetaProperty(), and QQuickMultiPointHandlerPrivate::yMetaProperty().

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indexOfSignal()

int QMetaObject::indexOfSignal

(

const char *

signal

)

const

Finds signal and returns its index; otherwise returns -1.

This is the same as indexOfMethod(), except that it will return -1 if the method exists but isn't a signal.

Note that the signal has to be in normalized form, as returned by normalizedSignature().

See also

indexOfMethod(), normalizedSignature(), method(), methodCount(), methodOffset()

Definition at line 804 of file qmetaobject.cpp.

References QMetaObjectPrivate::decodeMethodSignature(), i, QMetaObjectPrivate::indexOfSignalRelative(), priv(), Q_ASSERT, QMetaObjectPrivate::revision, and signal.

Referenced by QDBusAbstractAdaptor::setAutoRelaySignals().

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indexOfSlot()

int QMetaObject::indexOfSlot

(

const char *

slot

)

const

Finds slot and returns its index; otherwise returns -1.

This is the same as indexOfMethod(), except that it will return -1 if the method exists but isn't a slot.

See also

indexOfMethod(), method(), methodCount(), methodOffset()

Definition at line 851 of file qmetaobject.cpp.

References QMetaObjectPrivate::decodeMethodSignature(), i, QMetaObjectPrivate::indexOfSlotRelative(), priv(), Q_ASSERT, and QMetaObjectPrivate::revision.

Referenced by QQuickPixmapReader::run().

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inherits()

bool QMetaObject::inherits ( const QMetaObject *  metaObject ) const

noexcept

Returns true if the class described by this QMetaObject inherits the type described by metaObject; otherwise returns false.

A type is considered to inherit itself.

Since

5.7

Definition at line 369 of file qmetaobject.cpp.

References metaObject().

Referenced by QQmlMetaObject::canConvert(), canConvertMetaObject(), and convertMetaObject().

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invokeMethod() [1/10]

template<typename... Args>

template< typename... Args > bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, Args &&...  args  )

inlinestatic

Since

6.5 \threadsafe

Invokes the member (a signal or a slot name) on the object obj. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

For the overloads with a QMetaMethodReturnArgument parameter, the return value of the member function call is placed in ret. For the overloads without such a member, the return value of the called function (if any) will be discarded. QMetaMethodReturnArgument is an internal type you should not use directly. Instead, use the qReturnArg() function.

The overloads with a Qt::ConnectionType type parameter allow explicitly selecting whether the invocation will be synchronous or not:

\list

• If type is Qt::DirectConnection, the member will be invoked immediately in the current thread.

• If type is Qt::QueuedConnection, a QEvent will be sent and the member is invoked as soon as the application enters the event loop in the thread that the obj was created in or was moved to.

• If type is Qt::BlockingQueuedConnection, the method will be invoked in the same way as for Qt::QueuedConnection, except that the current thread will block until the event is delivered. Using this connection type to communicate between objects in the same thread will lead to deadlocks.

• If type is Qt::AutoConnection, the member is invoked synchronously if obj lives in the same thread as the caller; otherwise it will invoke the member asynchronously. This is the behavior of the overloads that do not have the type parameter. \endlist

You only need to pass the name of the signal or slot to this function, not the entire signature. For example, to asynchronously invoke the \l{QThread::quit()}{quit()} slot on a QThread, use the following code:

QMetaObject::invokeMethod(thread, "quit",
                          Qt::QueuedConnection);

With asynchronous method invocations, the parameters must be copyable types, because Qt needs to copy the arguments to store them in an event behind the scenes. Since Qt 6.5, this function automatically registers the types being used; however, as a side-effect, it is not possible to make calls using types that are only forward-declared. Additionally, it is not possible to make asynchronous calls that use references to non-const-qualified types as parameters either.

To synchronously invoke the compute(QString, int, double) slot on some arbitrary object obj retrieve its return value:

QString retVal;
QMetaObject::invokeMethod(obj, "compute", Qt::DirectConnection,
                         qReturnArg(retVal),
                         QString("sqrt"), 42, 9.7);

If the "compute" slot does not take exactly one \l QString, one int, and one double in the specified order, the call will fail. Note how it was necessary to be explicit about the type of the QString, as the character literal is not exactly the right type to match. If the method instead took a \l QStringView, a \l qsizetype, and a float, the call would need to be written as:

QString retVal;
QMetaObject::invokeMethod(obj, "compute", Qt::DirectConnection,
                         qReturnArg(retVal),
                         QStringView("sqrt"), qsizetype(42), 9.7f);

The same call can be executed using the Q_ARG() and Q_RETURN_ARG() macros, as in:

QString retVal;
QMetaObject::invokeMethod(obj, "compute", Qt::DirectConnection,
                          Q_RETURN_ARG(QString, retVal),
                          Q_ARG(QString, "sqrt"),
                          Q_ARG(int, 42),
                          Q_ARG(double, 9.7));

The macros are kept for compatibility with Qt 6.4 and earlier versions, and can be freely mixed with parameters that do not use the macro. They may be necessary in rare situations when calling a method that used a typedef to forward-declared type as a parameter or the return type.

See also

Q_ARG(), Q_RETURN_ARG(), QMetaMethod::invoke()

Definition at line 401 of file qobjectdefs.h.

References arguments, and Qt::AutoConnection.

invokeMethod() [2/10]

static bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, QGenericArgument  val0, QGenericArgument  val1 = QGenericArgument(), QGenericArgument  val2 = QGenericArgument(), QGenericArgument  val3 = QGenericArgument(), QGenericArgument  val4 = QGenericArgument(), QGenericArgument  val5 = QGenericArgument(), QGenericArgument  val6 = QGenericArgument(), QGenericArgument  val7 = QGenericArgument(), QGenericArgument  val8 = QGenericArgument(), QGenericArgument  val9 = QGenericArgument()  )

inlinestatic

Definition at line 340 of file qobjectdefs.h.

References Qt::AutoConnection.

invokeMethod() [3/10]

static bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, QGenericReturnArgument  ret, QGenericArgument  val0 = QGenericArgument(nullptr), QGenericArgument  val1 = QGenericArgument(), QGenericArgument  val2 = QGenericArgument(), QGenericArgument  val3 = QGenericArgument(), QGenericArgument  val4 = QGenericArgument(), QGenericArgument  val5 = QGenericArgument(), QGenericArgument  val6 = QGenericArgument(), QGenericArgument  val7 = QGenericArgument(), QGenericArgument  val8 = QGenericArgument(), QGenericArgument  val9 = QGenericArgument()  )

inlinestatic

Definition at line 306 of file qobjectdefs.h.

References Qt::AutoConnection, and ret.

invokeMethod() [4/10]

template<typename... Args>

template< typename... Args > bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, QMetaMethodReturnArgument  r, Args &&...  arguments  )

inlinestatic

Definition at line 389 of file qobjectdefs.h.

References arguments, and Qt::AutoConnection.

invokeMethod() [5/10]

template<typename... Args>

template< typename... Args > bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, Qt::ConnectionType  c, Args &&...  arguments  )

inlinestatic

Definition at line 377 of file qobjectdefs.h.

References arguments.

invokeMethod() [6/10]

template<typename... Args>

template< typename... Args > bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, Qt::ConnectionType  c, QMetaMethodReturnArgument  r, Args &&...  arguments  )

inlinestatic

Definition at line 363 of file qobjectdefs.h.

References arguments, and QtPrivate::invokeMethodHelper().

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invokeMethod() [7/10]

static bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, Qt::ConnectionType  type, QGenericArgument  val0, QGenericArgument  val1 = QGenericArgument(), QGenericArgument  val2 = QGenericArgument(), QGenericArgument  val3 = QGenericArgument(), QGenericArgument  val4 = QGenericArgument(), QGenericArgument  val5 = QGenericArgument(), QGenericArgument  val6 = QGenericArgument(), QGenericArgument  val7 = QGenericArgument(), QGenericArgument  val8 = QGenericArgument(), QGenericArgument  val9 = QGenericArgument()  )

inlinestatic

Definition at line 323 of file qobjectdefs.h.

invokeMethod() [8/10]

bool QMetaObject::invokeMethod ( QObject *  obj, const char *  member, Qt::ConnectionType  type, QGenericReturnArgument  ret, QGenericArgument  val0 = QGenericArgument(nullptr), QGenericArgument  val1 = QGenericArgument(), QGenericArgument  val2 = QGenericArgument(), QGenericArgument  val3 = QGenericArgument(), QGenericArgument  val4 = QGenericArgument(), QGenericArgument  val5 = QGenericArgument(), QGenericArgument  val6 = QGenericArgument(), QGenericArgument  val7 = QGenericArgument(), QGenericArgument  val8 = QGenericArgument(), QGenericArgument  val9 = QGenericArgument()  )

static

\threadsafe This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. \obsolete [6.5] Please use the variadic overload of this function

Invokes the member (a signal or a slot name) on the object obj. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

See the variadic invokeMethod() function for more information. This function should behave the same way as that one, with the following limitations:

\list

• The number of parameters is limited to 10.
• Parameter names may need to be an exact string match.
• Meta types are not automatically registered. \endlist

With asynchronous method invocations, the parameters must be of types that are already 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

QMetaObject::invokeMethod: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call invokeMethod().

See also

Q_ARG(), Q_RETURN_ARG(), qRegisterMetaType(), QMetaMethod::invoke()

Definition at line 1542 of file qmetaobject.cpp.

References MaximumParamCount, qstrlen(), and ret.

Referenced by QAndroidPlatformServices::QAndroidPlatformServices(), QDBusAbstractAdaptor::QDBusAbstractAdaptor(), QDBusPendingCallWatcher::QDBusPendingCallWatcher(), QGeoTiledMappingManagerEngineNokia::QGeoTiledMappingManagerEngineNokia(), QNetworkReplyDataImpl::QNetworkReplyDataImpl(), QNetworkReplyFileImpl::QNetworkReplyFileImpl(), QNetworkReplyHttpImpl::QNetworkReplyHttpImpl(), QPlaceContentReplyUnsupported::QPlaceContentReplyUnsupported(), QPlaceDetailsReplyUnsupported::QPlaceDetailsReplyUnsupported(), QPlaceIdReplyUnsupported::QPlaceIdReplyUnsupported(), QPlaceMatchReplyUnsupported::QPlaceMatchReplyUnsupported(), QPlaceReplyUnsupported::QPlaceReplyUnsupported(), QPlaceSearchReplyUnsupported::QPlaceSearchReplyUnsupported(), QPlaceSearchSuggestionReplyUnsupported::QPlaceSearchSuggestionReplyUnsupported(), QQnxIntegration::QQnxIntegration(), QVncServer::QVncServer(), QWaylandClientExtension::QWaylandClientExtension(), SharedTextureImageResponse::SharedTextureImageResponse(), QAndroidTextureVideoOutput::~QAndroidTextureVideoOutput(), QNetworkReplyFileImpl::~QNetworkReplyFileImpl(), QNetworkReplyHttpImplPrivate::_q_bufferOutgoingDataFinished(), QNetworkReplyImplPrivate::_q_bufferOutgoingDataFinished(), QNetworkReplyHttpImplPrivate::_q_cacheLoadReadyRead(), QHttpNetworkConnectionChannel::_q_connected(), QAbstractItemViewPrivate::_q_delegateSizeHintChanged(), QHttpNetworkConnectionChannel::_q_disconnected(), QHttpNetworkConnectionChannel::_q_encrypted(), QHttpNetworkConnectionChannel::_q_error(), QHttpNetworkConnectionPrivate::_q_hostLookupFinished(), QGraphicsScenePrivate::_q_polishItems(), QNetworkAccessManagerPrivate::_q_replyFinished(), QAbstractProxyModelPrivate::_q_sourceModelColumnsInserted(), QAbstractProxyModelPrivate::_q_sourceModelColumnsRemoved(), QAbstractProxyModelPrivate::_q_sourceModelRowsInserted(), QAbstractProxyModelPrivate::_q_sourceModelRowsRemoved(), QHttpThreadDelegate::abortRequest(), QQuickActionGroupPrivate::actions_clear(), QLayout::addChildWidget(), VariantRef::addref(), QHttpNetworkConnectionChannel::allDone(), QtWaylandClient::QWaylandWindow::applyConfigureWhenPossible(), AndroidCamera::autoFocus(), QQuick3DLightmapBaker::bake(), QPlatformAudioDecoder::bufferAvailableChanged(), QPlatformAudioDecoder::bufferReady(), QQuickButtonGroupPrivate::buttons_clear(), AndroidCamera::cancelAutoFocus(), QAbstractSocketPrivate::canCloseNotification(), QDeclarativePlace::category_clear(), QPSQLDriverPrivate::checkPendingNotifications(), QNetworkReplyFileImpl::close(), QHttpNetworkConnectionChannel::closeAndResendCurrentRequest(), contextStateCallback(), QGeoTileFetcherNokia::copyrightsFetched(), QtWaylandClient::QWaylandWindow::createDecoration(), QGraphicsProxyWidget::createProxyForChildWidget(), QQC2::createTreeViewHelperWindow(), QBluetoothLocalDevicePrivate::deviceConnected(), QBluetoothLocalDevicePrivate::deviceDisconnected(), QtAndroidDialogHelpers::dialogResult(), AVFImageCapture::doCapture(), QFFmpegImageCapture::doCapture(), QFFmpeg::Renderer::doForceStep(), SharedTextureImageResponse::doRequest(), QAbstractItemDelegatePrivate::editorEventFilter(), QSocks5SocketEnginePrivate::emitConnectionNotification(), QSocks5SocketEnginePrivate::emitReadNotification(), QHttpNetworkConnectionPrivate::emitReplyError(), QSocks5SocketEnginePrivate::emitWriteNotification(), QHttpNetworkConnectionChannel::ensureConnection(), QSocketNotifier::event(), QObject::event(), executeIMFRequest(), QTestEventLoop::exitLoop(), AndroidCamera::fetchLastPreviewFrame(), QDeclarativeGeoMapItemTransitionManager::finalizeEnterTransition(), QDeclarativeGeoMapItemTransitionManager::finalizeExitTransition(), QHttpThreadDelegate::finishedSlot(), QHttpThreadDelegate::finishedWithErrorSlot(), QNetworkReplyHttpImplPrivate::followRedirect(), QJSValuePrivate::free(), OrgFreedesktopDBusPropertiesAdaptor::Get(), OrgFreedesktopDBusPropertiesAdaptor::GetAll(), OrgFreedesktopDBusObjectManagerAdaptor::GetManagedObjects(), QPlaceManagerEngineNokiaV2::getPlaceContent(), handle_sqlite_callback(), QtAndroidInput::handleLocationChanged(), QPdfPageRendererPrivate::handleNextRequest(), handleOrientationChanged(), QHttpNetworkConnectionChannel::handleStatus(), QHttpNetworkConnectionChannel::handleUnexpectedEOF(), QtWaylandClient::QWaylandWindow::handleUpdate(), QPlaceManagerEngineMapbox::initializeCategories(), QPlatformMediaDevices::initVideoDevicesConnection(), QQuickTextEdit::invalidate(), QGraphicsSceneBspTreeIndexPrivate::invalidateSortCache(), QtAndroidAccessibility::invokeActionOnInterfaceInMainThread(), invokeDecrementPendingDevicesCountAndCheckFinished(), QQuickCanvasItem::itemChange(), jump(), QtAndroidInput::keyboardVisibilityChanged(), QQuickTumbler::keyPressEvent(), locationProvidersChanged(), locationProvidersDisabled(), AndroidCamera::lock(), QtAndroidInput::longPress(), LowEnergyNotificationHub::lowEnergy_advertisementError(), LowEnergyNotificationHub::lowEnergy_characteristicWritten(), LowEnergyNotificationHub::lowEnergy_connectionChange(), LowEnergyNotificationHub::lowEnergy_servicesDiscovered(), main(), QSSGLayerRenderData::maybeBakeLightmap(), MyObject::methodWithDelayedReply(), QNetworkConnectionEvents::NetworkConnectionConnectivityChanged(), networkInfoCleanup(), QNearFieldManagerPrivateImpl::newIntent(), AndroidCamera::notifyNewFrames(), notifySatelliteInfoUpdated(), QNearFieldManagerPrivateImpl::onCardInserted(), SocketWorker::onReadyRead(), QGeoPositionInfoSourceWinRT::onStatusChanged(), QNetworkAccessFileBackend::open(), AndroidCamera::open(), QMacPageSetupDialogPrivate::openCocoaPageLayout(), QPrintDialogPrivate::openCocoaPrintPanel(), QDesktopServices::openUrl(), QFFmpeg::PlaybackEngine::ObjectDeleter::operator()(), positionUpdated(), QNetworkReplyHttpImplPrivate::postRequest(), qEventCallback(), QInputMethod::queryFocusObject(), QPulseAudioSource::read(), QHttpThreadDelegate::readBufferFreed(), QSslSocket::readData(), QHttpNetworkConnectionPrivate::readMoreLater(), QNearFieldTargetPrivateImpl::readNdefMessages(), OrgBluezGattCharacteristic1Adaptor::ReadValue(), OrgBluezGattDescriptor1Adaptor::ReadValue(), AndroidCamera::reconnect(), QAnimationTimer::registerAnimation(), QQmlAnimationTimer::registerAnimation(), OrgBluezLEAdvertisement1Adaptor::Release(), AndroidCamera::release(), VariantRef::release(), QHttpNetworkConnectionPrivate::removeReply(), QLayoutPrivate::reparentChildWidgets(), QNearFieldTargetPrivate::reportError(), QBluetoothLocalDevice::requestPairing(), QtWaylandClient::QWaylandWindow::requestUpdate(), QHttpNetworkConnectionChannel::requeueCurrentlyPipelinedRequests(), QHttpNetworkConnectionPrivate::requeueRequest(), QHttpNetworkConnectionChannel::resendCurrentRequest(), QProgressDialog::reset(), QDarwinAudioSource::reset(), QAndroidTextureVideoOutput::reset(), QDarwinAudioSource::resume(), QSslSocket::resume(), QHttpNetworkConnectionPrivate::resumeConnection(), QEvdevTouchScreenHandlerThread::run(), QtAndroidAccessibility::runInObjectContext(), runOnQtThread(), QAndroidInputContext::safeCall(), QPlaceManagerEngineNokiaV2::search(), QPlaceManagerEngineNokiaV2::searchSuggestions(), QNetworkReplyHttpImplPrivate::sendCacheContents(), QNearFieldTargetPrivateImpl::sendCommand(), QHttpProtocolHandler::sendRequest(), QHttpNetworkConnectionChannel::sendRequestDelayed(), OrgFreedesktopDBusPropertiesAdaptor::Set(), AndroidCamera::setAutoExposureLock(), AndroidCamera::setAutoWhiteBalanceLock(), QAndroidPlatformIntegration::setAvailableGeometry(), QtWaylandClient::QWaylandWindow::setCanResize(), QAndroidPlatformIntegration::setColorScheme(), QDBusConnectionPrivate::setConnection(), QGraphicsItem::setCursor(), QFFmpeg::AudioSourceIO::setDevice(), AndroidCamera::setDisplayOrientation(), AndroidCamera::setExposureCompensation(), AndroidCamera::setFlashMode(), AndroidCamera::setFocusAreas(), AndroidCamera::setFocusMode(), AndroidCamera::setJpegQuality(), QFFmpegMediaPlayer::setMedia(), QFFmpeg::AudioSourceIO::setMuted(), QFFmpeg::Renderer::setOutputInternal(), QAudioEngine::setOutputMode(), QFFmpeg::PlaybackEngineObject::setPaused(), QDBusConnectionPrivate::setPeer(), QAndroidPlatformIntegration::setPhysicalSize(), AndroidCamera::setPictureSize(), QFFmpeg::Renderer::setPlaybackRate(), AndroidCamera::setPreviewDisplay(), AndroidCamera::setPreviewFormat(), AndroidCamera::setPreviewFpsRange(), AndroidCamera::setPreviewSize(), AndroidCamera::setPreviewTexture(), QAndroidPlatformIntegration::setRefreshRate(), AndroidCamera::setRotation(), QFFmpeg::AudioSourceIO::setRunning(), AndroidCamera::setSceneMode(), QGraphicsScenePrivate::setScenePosItemEnabled(), QAndroidPlatformIntegration::setScreenSize(), QAndroidPlatformIntegration::setScreenSizeParameters(), QNetworkReplyImplPrivate::setup(), AndroidCamera::setupPreviewFrameCallback(), QNetworkReplyHttpImplPrivate::setupTransferTimeout(), QQnxClipboard::MimeData::setUserMimeData(), QAndroidTextureVideoOutput::setVideoSize(), QFFmpeg::AudioSourceIO::setVolume(), AndroidCamera::setWhiteBalance(), QTableView::setWordWrap(), QHttpSocketEngine::setWriteNotificationEnabled(), AndroidCamera::setZoom(), QHttpNetworkConnectionPrivate::shouldEmitChannelError(), QTimer::singleShot(), QAudioEngine::start(), QUnifiedTimer::startAnimationTimer(), QHttpNetworkConnectionPrivate::startHostInfoLookup(), OrgBluezGattCharacteristic1Adaptor::StartNotify(), AndroidCamera::startPreview(), QHttpThreadDelegate::startRequestSynchronously(), QSingleShotTimer::startTimerForReceiver(), QGeoPositionInfoSourceGeoclue2::startUpdates(), QDarwinAudioSource::stop(), QAudioEngine::stop(), QAndroidTextureVideoOutput::stop(), QUnifiedTimer::stopAnimationTimer(), OrgBluezGattCharacteristic1Adaptor::StopNotify(), AndroidCamera::stopPreview(), AndroidCamera::stopPreviewSynchronous(), QWindowsMediaDeviceReader::stopRecording(), QNetworkAccessManager::supportedSchemes(), QAndroidPlatformScreen::surfaceChanged(), QAndroidTextureVideoOutput::surfaceTexture(), QDarwinAudioSource::suspend(), QHttpThreadDelegate::synchronousFinishedSlot(), QHttpThreadDelegate::synchronousFinishedWithErrorSlot(), QFFmpeg::Renderer::syncSoft(), AndroidCamera::takePicture(), QQuickContext2D::toImage(), QtAndroidInput::touchAdd(), SearchSuggestionReply::triggerDone(), AndroidCamera::unlock(), QAnimationTimer::unregisterAnimation(), QQmlAnimationTimer::unregisterAnimation(), QGraphicsItem::unsetCursor(), QGraphicsScene::update(), QTableView::updateGeometries(), QTreeView::updateGeometries(), QQuick3DViewport::updatePaintNode(), QQuick3DRuntimeLoader::updateSpatialNode(), QGeoTiledMappingManagerEngine::updateTileRequests(), updateWindow(), QGeoTileFetcherNokia::versionFetched(), wrapInFunction(), QBuffer::writeData(), QSslSocket::writeData(), QBluetoothSocketPrivateBluez::writeData(), QNearFieldTargetPrivateImpl::writeNdefMessages(), OrgBluezGattCharacteristic1Adaptor::WriteValue(), and OrgBluezGattDescriptor1Adaptor::WriteValue().

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invokeMethod() [9/10]

template<typename Func >

static std::enable_if_t<!std::disjunction_v< std::is_convertible< Func, const char * >, QtPrivate::Invoke::AreOldStyleArgs< Func > >, bool > QMetaObject::invokeMethod ( typename QtPrivate::ContextTypeForFunctor< Func >::ContextType *  object, Func &&  function, Qt::ConnectionType  type = Qt::AutoConnection, typename QtPrivate::Callable< Func >::ReturnType *  ret = nullptr  )

inlinestatic

Definition at line 417 of file qobjectdefs.h.

References function, and ret.

invokeMethod() [10/10]

template<typename Func >

static std::enable_if_t<!std::disjunction_v< std::is_convertible< Func, const char * >, QtPrivate::Invoke::AreOldStyleArgs< Func > >, bool > QMetaObject::invokeMethod ( typename QtPrivate::ContextTypeForFunctor< Func >::ContextType *  object, Func &&  function, typename QtPrivate::Callable< Func >::ReturnType *  ret  )

inlinestatic

Definition at line 432 of file qobjectdefs.h.

References Qt::AutoConnection, function, and ret.

metacall()

int QMetaObject::metacall ( QObject *  object, Call  cl, int  idx, void **  argv  )

static

Definition at line 329 of file qmetaobject.cpp.

Referenced by BindingFixer::BindingFixer(), QQmlListReference::QQmlListReference(), QMetaProperty::bindable(), doActivate(), QV4::Heap::QmlListWrapper::init(), QQmlAnyBinding::installOn(), QMetaMethodInvoker::invokeImpl(), QQmlObjectOrGadget::metacall(), QQmlVMEMetaObject::metaCall(), QQmlDMObjectDataMetaObject::metaCall(), QQuickPressHandler::mousePressEvent(), QQuickPressHandler::mouseReleaseEvent(), QMetaCallEvent::placeMetaCall(), QMetaProperty::read(), QQmlGadgetPtrWrapper::read(), QQmlProperty::reset(), QMetaProperty::reset(), QV4::QObjectWrapper::setProperty(), QQmlBinding::slowWrite(), QQuickPressHandler::timerEvent(), QQmlVMEMetaObjectEndpoint::tryConnect(), QV4::QObjectWrapper::virtualMetacall(), QV4::QQmlTypeWrapper::virtualMetacall(), QQmlGadgetPtrWrapper::write(), QMetaProperty::write(), QV4::QQmlValueTypeWrapper::write(), and QQmlPropertyPrivate::writeEnumProperty().

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metaType()

QMetaType QMetaObject::metaType

(

)

const

Since

6.2 Returns the metatype corresponding to this metaobject. If the metaobject originates from a namespace, an invalid metatype is returned.

Definition at line 413 of file qmetaobject.cpp.

References className(), d, QMetaType::fromName(), and priv().

Referenced by VDMAbstractItemModelDataType::createItem(), and VDMListDelegateDataType::createItem().

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method()

QMetaMethod QMetaObject::method

(

int

index

)

const

Returns the meta-data for the method with the given index.

See also

methodCount(), methodOffset(), indexOfMethod()

Definition at line 1167 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, i, method(), QMetaObjectPrivate::methodCount, methodOffset(), priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaType::clone(), QObject::connect(), QObject::dumpObjectInfo(), QQmlBoundSignalExpression::evaluate(), QTextDocument::loadResource(), main(), maybeInvokeSetupMethod(), QDBusInterfacePrivate::metacall(), QQmlVMEMetaObject::metaCall(), method(), QQmlMetaObject::methodParameterTypes(), QQmlMetaObject::methodReturnType(), QMetaProperty::notifySignal(), printMethodNotFoundWarning(), QTest::qPrintDataTags(), and QDBusAbstractAdaptor::setAutoRelaySignals().

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methodCount()

int QMetaObject::methodCount

(

)

const

Returns the number of methods in this class, including the number of methods provided by each base class.

These include signals and slots as well as normal member functions.

Use code like the following to obtain a QStringList containing the methods specific to a given class:

const QMetaObject* metaObject = obj->metaObject();
QStringList methods;
for(int i = metaObject->methodOffset(); i < metaObject->methodCount(); ++i)
    methods << QString::fromLatin1(metaObject->method(i).methodSignature());

See also

method(), methodOffset(), indexOfMethod()

Definition at line 565 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, QMetaObjectPrivate::methodCount, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaType::clone(), QQmlDMObjectDataMetaObject::createProperty(), QQmlPropertyCache::invalidate(), main(), printMethodNotFoundWarning(), QTest::qPrintDataTags(), QDBusAbstractAdaptor::setAutoRelaySignals(), and QQmlPropertyCache::update().

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methodOffset()

int QMetaObject::methodOffset

(

)

const

Returns the method offset for this class; i.e.

the index position of this class's first member function.

The offset is the sum of all the methods in the class's superclasses (which is always positive since QObject has the deleteLater() slot and a destroyed() signal).

See also

method(), methodCount(), indexOfMethod()

Definition at line 465 of file qmetaobject.cpp.

References d, QMetaObjectPrivate::methodCount, priv(), and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaType::clone(), QObject::connect(), QMetaObjectPrivate::connect(), QQmlDMObjectDataMetaObject::createProperty(), QQmlOpenMetaObjectTypePrivate::init(), QDBusInterfacePrivate::metacall(), method(), QMetaMethod::methodIndex(), QMetaProperty::notifySignalIndex(), and QQmlMetaObject::resolveGadgetMethodOrPropertyIndex().

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newInstance()

template<typename... Args>

template< typename... Args > QObject * QMetaObject::newInstance ( Args &&...  arguments ) const

inline

Since

6.5

Constructs a new instance of this class and returns the new object, or \nullptr if no suitable constructor is available. The types of the arguments arguments will be used to find a matching constructor, and then forwarded to it the same way signal-slot connections do.

Note that only constructors that are declared with the Q_INVOKABLE modifier are made available through the meta-object system.

See also

constructor()

Definition at line 460 of file qobjectdefs.h.

References arguments, and QtPrivate::invokeMethodHelper().

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normalizedSignature()

QByteArray QMetaObject::normalizedSignature ( const char *  method )

static

Normalizes the signature of the given method.

Qt uses normalized signatures to decide whether two given signals and slots are compatible. Normalization reduces whitespace to a minimum, moves 'const' to the front where appropriate, removes 'const' from value types and replaces const references with values.

See also

checkConnectArgs(), normalizedType()

Definition at line 1363 of file qmetaobject.cpp.

References d, QVarLengthArray< T, Prealloc >::data(), method, qNormalizeType(), and qRemoveWhitespace().

Referenced by QSignalSpy::QSignalSpy(), QObject::connect(), QObject::disconnect(), QMetaObjectBuilder::indexOfConstructor(), QMetaObjectBuilder::indexOfMethod(), QMetaObjectBuilder::indexOfSignal(), QMetaObjectBuilder::indexOfSlot(), QDBusConnectionPrivate::prepareHook(), QObject::receivers(), QDBusAbstractAdaptor::setAutoRelaySignals(), QDBusPendingCallPrivate::setReplyCallback(), signalForMember(), and wrapInFunction().

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normalizedType()

QByteArray QMetaObject::normalizedType ( const char *  type )

static

Since

4.2

Normalizes a type.

See QMetaObject::normalizedSignature() for a description on how Qt normalizes.

Example:

QByteArray normType = QMetaObject::normalizedType(" int    const  *");
// normType is now "const int*"

See also

normalizedSignature()

Definition at line 1347 of file qmetaobject.cpp.

References qstrlen().

Referenced by QMetaMethod::invokeOnGadget(), QQmlJSCodeGenerator::metaTypeFromName(), qMetaTypeTypeImpl(), QMetaType::qRegisterMetaType(), qRegisterNormalizedMetaTypeImplementation(), QMetaMethodBuilder::setReturnType(), and wrapInFunction().

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operator RestrictedBool()

QMetaObject::operator RestrictedBool ( ) const

inline

Definition at line 554 of file qobjectdefs.h.

operator=()

Connection & QMetaObject::operator=

(

const Connection &

other

)

property()

QMetaProperty QMetaObject::property

(

int

index

)

const

Returns the meta-data for the property with the given index.

If no such property exists, a null QMetaProperty is returned.

See also

propertyCount(), propertyOffset(), indexOfProperty()

Definition at line 1202 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, i, priv(), property(), QMetaObjectPrivate::propertyCount, propertyOffset(), and QMetaObject::Data::superdata.

Referenced by QQmlVMEResolvedList::QQmlVMEResolvedList(), QMetaObjectBuilder::addMetaObject(), createOrConstructValueType(), QQmlBinding::dependencies(), doWriteProperties(), doWriteProperties(), doWriteProperties(), QQmlAbstractBinding::getPropertyData(), getValueFromProperty(), QQmlPropertyPrivate::initProperty(), main(), QQmlDesignerMetaObject::metaCall(), QQmlProperty::name(), QQmlDesignerMetaObject::notifyPropertyChange(), QObject::property(), property(), QQmlGadgetPtrWrapper::property(), QQmlProperty::propertyTypeName(), qQmlPropertyCacheCreate(), removePendingQPropertyBinding(), VDMListDelegateDataType::setValue(), QQuickWheelHandlerPrivate::targetMetaProperty(), QQmlPropertyToPropertyBinding::update(), VDMListDelegateDataType::value(), QQuickMultiPointHandlerPrivate::xMetaProperty(), and QQuickMultiPointHandlerPrivate::yMetaProperty().

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propertyCount()

int QMetaObject::propertyCount

(

)

const

Returns the number of properties in this class, including the number of properties provided by each base class.

Use code like the following to obtain a QStringList containing the properties specific to a given class:

const QMetaObject* metaObject = obj->metaObject();
QStringList properties;
for(int i = metaObject->propertyOffset(); i < metaObject->propertyCount(); ++i)
    properties << QString::fromLatin1(metaObject->property(i).name());

See also

property(), propertyOffset(), indexOfProperty()

Definition at line 603 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, priv(), QMetaObjectPrivate::propertyCount, and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlMetaType::clone(), VDMListDelegateDataType::columnCount(), VDMListDelegateDataType::createProperty(), QQmlDMObjectDataMetaObject::createProperty(), QQmlBinding::dependencies(), doWriteProperties(), doWriteProperties(), doWriteProperties(), VDMListDelegateDataType::emitAllSignals(), QQmlPropertyCache::invalidate(), main(), QQmlMetaObject::propertyCount(), QQmlPropertyCache::update(), and userProperty().

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propertyOffset()

int QMetaObject::propertyOffset

(

)

const

Returns the property offset for this class; i.e.

the index position of this class's first property.

The offset is the sum of all the properties in the class's superclasses (which is always positive since QObject has the name() property).

See also

property(), propertyCount(), indexOfProperty()

Definition at line 508 of file qmetaobject.cpp.

References d, priv(), QMetaObjectPrivate::propertyCount, and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QMetaProperty::bindable(), QQmlMetaType::clone(), QQmlDMObjectDataMetaObject::createProperty(), QQmlOpenMetaObjectTypePrivate::init(), property(), QMetaProperty::propertyIndex(), qQmlPropertyCacheCreate(), QMetaProperty::read(), QMetaProperty::reset(), QQmlMetaObject::resolveGadgetMethodOrPropertyIndex(), QQuick3DCustomMaterial::updateSpatialNode(), QQuick3DEffect::updateSpatialNode(), and QMetaProperty::write().

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static_metacall()

int QMetaObject::static_metacall	(	Call	cl,
		int	idx,
		void **	argv
	)		const

Definition at line 317 of file qmetaobject.cpp.

References d, QMetaObject::Data::data, priv(), Q_ASSERT, QMetaObjectPrivate::revision, and QMetaObject::Data::static_metacall.

Referenced by callConstructor().

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staticMetaObject()

template<const QMetaObject & MO>

static constexpr const QMetaObject * QMetaObject::staticMetaObject ( )

inlinestaticconstexpr

Definition at line 484 of file qobjectdefs.h.

Referenced by VDMListDelegateDataType::metaObjectFromType().

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superClass()

const QMetaObject * QMetaObject::superClass ( ) const

inline

Returns the meta-object of the superclass, or \nullptr if there is no such object.

See also

className()

Definition at line 567 of file qobjectdefs.h.

References d, and QMetaObject::Data::superdata.

Referenced by QMetaObjectBuilder::addMetaObject(), QQmlPropertyCache::createStandalone(), QObject::disconnect(), QMetaObjectPrivate::firstMethod(), QApplication::font(), QQDMIncubationTask::initializeRequiredProperties(), QQmlPrivate::isTypeCompatible(), qQmlPropertyCacheCreate(), QQmlMetaObject::resolveGadgetMethodOrPropertyIndex(), QQmlInterceptorMetaObject::toDynamicMetaObject(), QQuick3DCustomMaterial::updateSpatialNode(), and QQuick3DEffect::updateSpatialNode().

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swap()

void QMetaObject::swap ( Connection &  other )

inlinenoexcept

Definition at line 559 of file qobjectdefs.h.

References other(), and qt_ptr_swap().

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tr()

QString QMetaObject::tr	(	const char *	s,
		const char *	c,
		int	n = -1
	)		const

Definition at line 402 of file qmetaobject.cpp.

References objectClassName(), and QCoreApplication::translate().

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userProperty()

QMetaProperty QMetaObject::userProperty

(

)

const

Since

4.2

Returns the property that has the USER flag set to true.

See also

QMetaProperty::isUser()

Definition at line 1221 of file qmetaobject.cpp.

References i, QMetaProperty::isUser(), property, and propertyCount().

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Friends And Related Symbol Documentation

QMetaObject

friend struct QMetaObject

friend

Definition at line 541 of file qobjectdefs.h.

QObject

friend class QObject

friend

Definition at line 539 of file qobjectdefs.h.

QObjectPrivate

friend class QObjectPrivate

friend

Definition at line 540 of file qobjectdefs.h.

QTimer

friend class QTimer

friend

Definition at line 533 of file qobjectdefs.h.

Member Data Documentation

d

struct QMetaObject::Data QMetaObject::d

Referenced by QMetaObjectBuilder::addMetaObject(), buildMetaObject(), QV4::QObjectMethod::callInternal(), classInfo(), classInfoCount(), classInfoOffset(), computeOffsets(), QMetaObjectPrivate::connect(), constructor(), constructorCount(), enumerator(), enumeratorCount(), enumeratorOffset(), QMetaObjectPrivate::get(), indexOfConstructor(), indexOfEnumerator(), indexOfProperty(), QQmlTypePrivate::init(), QDBusMetaObject::inputTypesForMethod(), QMetaMethod::invokeOnGadget(), QMetaEnum::key(), QMetaEnum::keysToValue(), QMetaEnum::keyToValue(), QMetaObjectPrivate::memberIndexes(), QQmlObjectOrGadget::metacall(), QMetaEnum::metaType(), QMetaProperty::metaType(), metaType(), method(), methodCount(), methodOffset(), normalizedSignature(), QDBusMetaObject::outputTypesForMethod(), QMetaMethod::parameterMetaType(), property(), propertyCount(), QDBusMetaObject::propertyMetaType(), propertyOffset(), QQmlMetaType::proxyData(), QMetaProperty::read(), QMetaProperty::readOnGadget(), QMetaProperty::reset(), QMetaProperty::resetOnGadget(), QMetaMethod::returnMetaType(), QMetaMethod::revision(), QMetaMethod::signature(), static_metacall(), superClass(), QMetaEnum::value(), QMetaEnum::valueToKey(), QMetaEnum::valueToKeys(), QMetaProperty::write(), QMetaProperty::writeOnGadget(), and QMetaProperty::writeOnGadget().

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The documentation for this class was generated from the following files:

• qtbase/src/corelib/kernel/qobjectdefs.h
• qtbase/src/corelib/kernel/qmetaobject.cpp
• qtbase/src/corelib/kernel/qobject.cpp