\inmodule QtCore More...

#include <qmetaobject.h>

Collaboration diagram for QMetaProperty:

Public Member Functions
constexpr	QMetaProperty ()
const char *	name () const
	Returns this property's name.
const char *	typeName () const
	Returns the name of this property's type.
int	userType () const
int	typeId () const
QMetaType	metaType () const
int	propertyIndex () const
int	relativePropertyIndex () const
bool	isReadable () const
	Returns `true` if this property is readable; otherwise returns `false`.
bool	isWritable () const
	Returns `true` if this property is writable; otherwise returns false.
bool	isResettable () const
	Returns `true` if this property can be reset to a default value; otherwise returns `false`.
bool	isDesignable () const
	Returns `false` if the {Q_PROPERTY()}'s `DESIGNABLE` attribute is false; otherwise returns `true`.
bool	isScriptable () const
	Returns `false` if the {Q_PROPERTY()}'s `SCRIPTABLE` attribute is false; otherwise returns true.
bool	isStored () const
	Returns `true` if the property is stored; otherwise returns false.
bool	isUser () const
	Returns `false` if the `{Q_PROPERTY()}'s` `USER` attribute is false.
bool	isConstant () const
bool	isFinal () const
bool	isVirtual () const
bool	isOverride () const
bool	isRequired () const
bool	isBindable () const
bool	isFlagType () const
	Returns `true` if the property's type is an enumeration value that is used as a flag; otherwise returns `false`.
bool	isEnumType () const
	Returns `true` if the property's type is an enumeration value; otherwise returns `false`.
QMetaEnum	enumerator () const
	Returns the enumerator if this property's type is an enumerator type; otherwise the returned value is undefined.
bool	hasNotifySignal () const
	Returns `true` if this property has a corresponding change notify signal; otherwise returns `false`.
QMetaMethod	notifySignal () const
int	notifySignalIndex () const
int	revision () const
QVariant	read (const QObject *obj) const
	Reads the property's value from the given object.
bool	write (QObject *obj, const QVariant &value) const
	Writes value as the property's value to the given object.
bool	write (QObject *obj, QVariant &&value) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
bool	reset (QObject *obj) const
	Resets the property for the given object with a reset method.
QUntypedBindable	bindable (QObject *object) const
QVariant	readOnGadget (const void *gadget) const
bool	writeOnGadget (void *gadget, const QVariant &value) const
bool	writeOnGadget (void *gadget, QVariant &&value) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
bool	resetOnGadget (void *gadget) const
bool	hasStdCppSet () const
bool	isAlias () const
bool	isValid () const
	Returns `true` if this property is valid (readable); otherwise returns `false`.
const QMetaObject *	enclosingMetaObject () const

Friends
struct	QMetaObject
struct	QMetaObjectPrivate

Detailed Description

\inmodule QtCore

The QMetaProperty class provides meta-data about a property.

Property meta-data is obtained from an object's meta-object. See QMetaObject::property() and QMetaObject::propertyCount() for details.

Definition at line 341 of file qmetaobject.h.

Constructor & Destructor Documentation

◆ QMetaProperty()

QMetaProperty::QMetaProperty ( )

inlineconstexpr

Definition at line 344 of file qmetaobject.h.

Member Function Documentation

◆ bindable()

QUntypedBindable QMetaProperty::bindable ( QObject * object ) const

Since: 6.0 Returns the bindable interface for the property on a given object.

If the property doesn't support bindings, the returned interface will be invalid.

See also: QObjectBindableProperty, QProperty, isBindable()

Definition at line 4155 of file qmetaobject.cpp.

◆ enclosingMetaObject()

const QMetaObject * QMetaProperty::enclosingMetaObject ( ) const

inline

Definition at line 401 of file qmetaobject.h.

◆ enumerator()

QMetaEnum QMetaProperty::enumerator ( ) const

Returns the enumerator if this property's type is an enumerator type; otherwise the returned value is undefined.

See also: isEnumType(), isFlagType()

Definition at line 4007 of file qmetaobject.cpp.

◆ hasNotifySignal()

bool QMetaProperty::hasNotifySignal ( ) const

Returns true if this property has a corresponding change notify signal; otherwise returns false.

See also: notifySignal()

Definition at line 4247 of file qmetaobject.cpp.

◆ hasStdCppSet()

bool QMetaProperty::hasStdCppSet ( ) const

Returns true if the property has a C++ setter function that follows Qt's standard "name" / "setName" pattern. Designer and uic query hasStdCppSet() in order to avoid expensive QObject::setProperty() calls. All properties in Qt [should] follow this pattern.

Definition at line 3924 of file qmetaobject.cpp.

◆ isAlias()

bool QMetaProperty::isAlias ( ) const

Returns true if the property is an alias. This is for instance true for a property declared in QML as 'property alias'.

Definition at line 3938 of file qmetaobject.cpp.

◆ isBindable()

bool QMetaProperty::isBindable ( ) const

Since: 6.0 Returns true if the {Q_PROPERTY()} exposes binding functionality; otherwise returns false.

This implies that you can create bindings that use this property as a dependency or install QPropertyObserver objects on this property. Unless the property is readonly, you can also set a binding on this property.

See also: QProperty, isWritable(), bindable()

Definition at line 4468 of file qmetaobject.cpp.

◆ isConstant()

bool QMetaProperty::isConstant ( ) const

Since: 4.6 Returns true if the property is constant; otherwise returns false.

A property is constant if the {Q_PROPERTY()}'s CONSTANT attribute is set.

Definition at line 4396 of file qmetaobject.cpp.

◆ isDesignable()

bool QMetaProperty::isDesignable ( ) const

Returns false if the {Q_PROPERTY()}'s DESIGNABLE attribute is false; otherwise returns true.

See also: isScriptable(), isStored()

Definition at line 4337 of file qmetaobject.cpp.

◆ isEnumType()

bool QMetaProperty::isEnumType ( ) const

Returns true if the property's type is an enumeration value; otherwise returns false.

See also: enumerator(), isFlagType()

Definition at line 3908 of file qmetaobject.cpp.

◆ isFinal()

bool QMetaProperty::isFinal ( ) const

Since: 4.6 Returns true if the property is final; otherwise returns false.

A property is final if the {Q_PROPERTY()}'s FINAL attribute is set.

Definition at line 4410 of file qmetaobject.cpp.

◆ isFlagType()

bool QMetaProperty::isFlagType ( ) const

Returns true if the property's type is an enumeration value that is used as a flag; otherwise returns false.

Flags can be combined using the OR operator. A flag type is implicitly also an enum type.

See also: isEnumType(), enumerator(), QMetaEnum::isFlag()

Definition at line 3897 of file qmetaobject.cpp.

◆ isOverride()

bool QMetaProperty::isOverride ( ) const

Since: 6.11 Returns true if the property does override; otherwise returns false.

A property does override if the {Q_PROPERTY()}'s OVERRIDE attribute is set.

Definition at line 4438 of file qmetaobject.cpp.

◆ isReadable()

bool QMetaProperty::isReadable ( ) const

Returns true if this property is readable; otherwise returns false.

See also: isWritable(), read(), isValid()

Definition at line 4234 of file qmetaobject.cpp.

◆ isRequired()

bool QMetaProperty::isRequired ( ) const

Since: 5.15 Returns true if the property is required; otherwise returns false.

A property is final if the {Q_PROPERTY()}'s REQUIRED attribute is set.

Definition at line 4452 of file qmetaobject.cpp.

◆ isResettable()

bool QMetaProperty::isResettable ( ) const

Returns true if this property can be reset to a default value; otherwise returns false.

See also: reset()

Definition at line 4222 of file qmetaobject.cpp.

◆ isScriptable()

bool QMetaProperty::isScriptable ( ) const

Returns false if the {Q_PROPERTY()}'s SCRIPTABLE attribute is false; otherwise returns true.

See also: isDesignable(), isStored()

Definition at line 4350 of file qmetaobject.cpp.

◆ isStored()

bool QMetaProperty::isStored ( ) const

Returns true if the property is stored; otherwise returns false.

The function returns false if the {Q_PROPERTY()}'s STORED attribute is false; otherwise returns true.

See also: isDesignable(), isScriptable()

Definition at line 4367 of file qmetaobject.cpp.

◆ isUser()

bool QMetaProperty::isUser ( ) const

Returns false if the {Q_PROPERTY()}'s USER attribute is false.

Otherwise it returns true, indicating the property is designated as the USER property, i.e., the one that the user can edit or that is significant in some other way.

See also: QMetaObject::userProperty(), isDesignable(), isScriptable()

Definition at line 4382 of file qmetaobject.cpp.

◆ isValid()

bool QMetaProperty::isValid ( ) const

inline

Returns true if this property is valid (readable); otherwise returns false.

See also: isReadable()

Definition at line 400 of file qmetaobject.h.

◆ isVirtual()

bool QMetaProperty::isVirtual ( ) const

Since: 6.11 Returns true if the property is virtual; otherwise returns false.

A property is virtual if the {Q_PROPERTY()}'s VIRTUAL attribute is set.

Definition at line 4424 of file qmetaobject.cpp.

◆ isWritable()

bool QMetaProperty::isWritable ( ) const

Returns true if this property is writable; otherwise returns false.

See also: isReadable(), write()

Definition at line 4324 of file qmetaobject.cpp.

◆ metaType()

QMetaType QMetaProperty::metaType ( ) const

Since: 6.0

Returns this property's QMetaType.

See also: QMetaType

Definition at line 3846 of file qmetaobject.cpp.

◆ name()

const char * QMetaProperty::name ( ) const

Returns this property's name.

See also: type(), typeName()

Definition at line 3788 of file qmetaobject.cpp.

◆ notifySignal()

QMetaMethod QMetaProperty::notifySignal ( ) const

Since: 4.5

Returns the QMetaMethod instance of the property change notifying signal if one was specified, otherwise returns an invalid QMetaMethod.

See also: hasNotifySignal()

Definition at line 4262 of file qmetaobject.cpp.

◆ notifySignalIndex()

int QMetaProperty::notifySignalIndex ( ) const

Since: 4.6

Returns the index of the property change notifying signal if one was specified, otherwise returns -1.

See also: hasNotifySignal()

Definition at line 4279 of file qmetaobject.cpp.

◆ propertyIndex()

int QMetaProperty::propertyIndex ( ) const

Since: 4.6

Returns this property's index.

Definition at line 3868 of file qmetaobject.cpp.

◆ read()

QVariant QMetaProperty::read ( const QObject * object ) const

Reads the property's value from the given object.

Returns the value if it was able to read it; otherwise returns an invalid variant.

See also: write(), reset(), isReadable()

Definition at line 4018 of file qmetaobject.cpp.

◆ readOnGadget()

QVariant QMetaProperty::readOnGadget ( const void * gadget ) const

Since: 5.5

Reads the property's value from the given gadget. Returns the value if it was able to read it; otherwise returns an invalid variant.

This function should only be used if this is a property of a Q_GADGET

Definition at line 4170 of file qmetaobject.cpp.

◆ relativePropertyIndex()

int QMetaProperty::relativePropertyIndex ( ) const

Since: 5.14

Returns this property's index relative within the enclosing meta object.

Definition at line 3880 of file qmetaobject.cpp.

◆ reset()

bool QMetaProperty::reset ( QObject * object ) const

Resets the property for the given object with a reset method.

Returns true if the reset worked; otherwise returns false.

Reset methods are optional; only a few properties support them.

See also: read(), write()

Definition at line 4134 of file qmetaobject.cpp.

◆ resetOnGadget()

bool QMetaProperty::resetOnGadget ( void * gadget ) const

Since: 5.5

Resets the property for the given gadget with a reset method. Returns true if the reset worked; otherwise returns false.

Reset methods are optional; only a few properties support them.

This function should only be used if this is a property of a Q_GADGET

Definition at line 4210 of file qmetaobject.cpp.

◆ revision()

int QMetaProperty::revision ( ) const

Since: 5.1

Returns the property revision if one was specified by Q_REVISION, otherwise returns 0. Since Qt 6.0, non-zero values are encoded and can be decoded using QTypeRevision::fromEncodedVersion().

Definition at line 4311 of file qmetaobject.cpp.

◆ typeId()

int QMetaProperty::typeId ( ) const

inline

Since: 6.0

Returns the storage type of the property. This is the same as metaType().id().

See also: QMetaType, typeName(), metaType()

Definition at line 357 of file qmetaobject.h.

◆ typeName()

const char * QMetaProperty::typeName ( ) const

Returns the name of this property's type.

See also: type(), name()

Definition at line 3800 of file qmetaobject.cpp.

◆ userType()

int QMetaProperty::userType ( ) const

inline

Since: 4.2

Returns this property's user type. The return value is one of the values that are registered with QMetaType.

This is equivalent to metaType().id()

See also: type(), QMetaType, typeName(), metaType()

Definition at line 356 of file qmetaobject.h.

◆ write() [1/2]

bool QMetaProperty::write	(	QObject *	object,
		const QVariant &	value ) const

Writes value as the property's value to the given object.

Returns true if the write succeeded; otherwise returns false.

If value is not of the same type as the property, a conversion is attempted. An empty QVariant() is equivalent to a call to reset() if this property is resettable, or setting a default-constructed object otherwise.

Note: This function internally makes a copy of value. Prefer to use the rvalue overload when possible.

See also: read(), reset(), isWritable()

Definition at line 4067 of file qmetaobject.cpp.

◆ write() [2/2]

bool QMetaProperty::write	(	QObject *	object,
		QVariant &&	v ) const

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

Since: 6.6

Definition at line 4078 of file qmetaobject.cpp.

◆ writeOnGadget() [1/2]

bool QMetaProperty::writeOnGadget	(	void *	gadget,
		const QVariant &	value ) const

Since: 5.5

Writes value as the property's value to the given gadget. Returns true if the write succeeded; otherwise returns false.

This function should only be used if this is a property of a Q_GADGET

Definition at line 4184 of file qmetaobject.cpp.

◆ writeOnGadget() [2/2]

bool QMetaProperty::writeOnGadget	(	void *	gadget,
		QVariant &&	value ) const

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

Since: 6.6

Definition at line 4194 of file qmetaobject.cpp.

◆ QMetaObject

friend struct QMetaObject

friend

Definition at line 429 of file qmetaobject.h.

◆ QMetaObjectPrivate

friend struct QMetaObjectPrivate

friend

Definition at line 430 of file qmetaobject.h.

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

qtbase/src/corelib/kernel/qmetaobject.h (ac25d9bf813ba9df42a9773d5127bac30c5d35ba)
qtbase/src/corelib/kernel/qmetaobject.cpp (ac25d9bf813ba9df42a9773d5127bac30c5d35ba)

Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

◆ QMetaProperty()

Member Function Documentation

◆ bindable()

◆ enclosingMetaObject()

◆ enumerator()

◆ hasNotifySignal()

◆ hasStdCppSet()

◆ isAlias()

◆ isBindable()

◆ isConstant()

◆ isDesignable()

◆ isEnumType()

◆ isFinal()

◆ isFlagType()

◆ isOverride()

◆ isReadable()

◆ isRequired()

◆ isResettable()

◆ isScriptable()

◆ isStored()

◆ isUser()

◆ isValid()

◆ isVirtual()

◆ isWritable()

◆ metaType()

◆ name()

◆ notifySignal()

◆ notifySignalIndex()

◆ propertyIndex()

◆ read()

◆ readOnGadget()

◆ relativePropertyIndex()

◆ reset()

◆ resetOnGadget()

◆ revision()

◆ typeId()

◆ typeName()

◆ userType()

◆ write() [1/2]

◆ write() [2/2]

◆ writeOnGadget() [1/2]

◆ writeOnGadget() [2/2]

Friends And Related Symbol Documentation

◆ QMetaObject

◆ QMetaObjectPrivate