\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	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 333 of file qmetaobject.h.

Constructor & Destructor Documentation

◆ QMetaProperty()

QMetaProperty::QMetaProperty ( )

inlineconstexpr

Definition at line 336 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 4044 of file qmetaobject.cpp.

◆ enclosingMetaObject()

const QMetaObject * QMetaProperty::enclosingMetaObject ( ) const

inline

Definition at line 391 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 3896 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 4136 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 3813 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 3827 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 4329 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 4285 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 4226 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 3797 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 4299 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 3786 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 4123 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 4313 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 4111 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 4239 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 4256 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 4271 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 390 of file qmetaobject.h.

◆ isWritable()

bool QMetaProperty::isWritable ( ) const

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

See also: isReadable(), write()

Definition at line 4213 of file qmetaobject.cpp.

◆ metaType()

QMetaType QMetaProperty::metaType ( ) const

Since: 6.0

Returns this property's QMetaType.

See also: QMetaType

Definition at line 3737 of file qmetaobject.cpp.

◆ name()

const char * QMetaProperty::name ( ) const

Returns this property's name.

See also: type(), typeName()

Definition at line 3679 of file qmetaobject.cpp.

Referenced by testing.tools.encode_pdf_filter._PdfStream::RegisterByName().

Here is the caller graph for this function:

◆ 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 4151 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 4168 of file qmetaobject.cpp.

◆ propertyIndex()

int QMetaProperty::propertyIndex ( ) const

Since: 4.6

Returns this property's index.

Definition at line 3757 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 3907 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 4059 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 3769 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 4023 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 4099 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 4200 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 349 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 3691 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 348 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 3956 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 3967 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 4073 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 4083 of file qmetaobject.cpp.

Friends And Related Symbol Documentation

◆ QMetaObject

friend struct QMetaObject

friend

Definition at line 419 of file qmetaobject.h.

◆ QMetaObjectPrivate

friend struct QMetaObjectPrivate

friend

Definition at line 420 of file qmetaobject.h.

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

qtbase/src/corelib/kernel/qmetaobject.h (9b481a78bffb0bd92165ad1944c01f1f0cf25cca)
qtbase/src/corelib/kernel/qmetaobject.cpp (5627e113793df3df24742d7af502a075c2c9e95d)

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()

◆ isReadable()

◆ isRequired()

◆ isResettable()

◆ isScriptable()

◆ isStored()

◆ isUser()

◆ isValid()

◆ 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