\inmodule QtCore More...

#include <qproperty.h>

Inheritance diagram for QUntypedBindable:

Collaboration diagram for QUntypedBindable:

Public Member Functions
constexpr	QUntypedBindable ()=default
	Default-constructs a QUntypedBindable.

template<typename Property >
	QUntypedBindable (Property *p)
	Constructs a QUntypedBindable from the property property.

bool	isValid () const
	Returns true if the QUntypedBindable is valid.

bool	isBindable () const

bool	isReadOnly () const

QUntypedPropertyBinding	makeBinding (const QPropertyBindingSourceLocation &location=QT_PROPERTY_DEFAULT_BINDING_LOCATION) const
	Creates a binding returning the underlying properties' value, using a specified source location.

QUntypedPropertyBinding	takeBinding ()
	Removes the currently set binding from the property and returns it.

void	observe (QPropertyObserver *observer) const

template<typename Functor >
QPropertyChangeHandler< Functor >	onValueChanged (Functor f) const
	Installs f as a change handler.

template<typename Functor >
QPropertyChangeHandler< Functor >	subscribe (Functor f) const
	Behaves like a call to f followed by `onValueChanged(f)`,.

template<typename Functor >
QPropertyNotifier	addNotifier (Functor f)
	Installs f as a change handler.

QUntypedPropertyBinding	binding () const
	Returns the underlying property's binding if there is any, or a default constructed QUntypedPropertyBinding otherwise.

bool	setBinding (const QUntypedPropertyBinding &binding)
	Sets the underlying property's binding to binding.

bool	hasBinding () const
	Returns `true` if the underlying property has a binding.

QMetaType	metaType () const

Protected Member Functions
constexpr	QUntypedBindable (QUntypedPropertyData d, const QtPrivate::QBindableInterface i)

Q_CORE_EXPORT	QUntypedBindable (QObject obj, const QMetaProperty &property, const QtPrivate::QBindableInterface i)

Q_CORE_EXPORT	QUntypedBindable (QObject obj, const char property, const QtPrivate::QBindableInterface *i)

Protected Attributes
QUntypedPropertyData *	data = nullptr

const QtPrivate::QBindableInterface *	iface = nullptr

Friends
struct	QUntypedBindablePrivate

Detailed Description

\inmodule QtCore

QUntypedBindable is a uniform interface over bindable properties like QProperty<T> and QObjectBindableProperty of any type T.

Since: 6.0

QUntypedBindable is a fully type-erased generic interface to wrap bindable properties. You can use it to interact with properties without knowing their type nor caring what kind of bindable property they are (e.g. QProperty or QObjectBindableProperty). For most use cases, using QBindable<T> (which is generic over the property implementation but has a fixed type) should be preferred.

Definition at line 678 of file qproperty.h.

Constructor & Destructor Documentation

◆ QUntypedBindable() [1/5]

constexpr QUntypedBindable::QUntypedBindable	(	QUntypedPropertyData *	d,
		const QtPrivate::QBindableInterface *	i )

inlineconstexprprotected

Definition at line 684 of file qproperty.h.

◆ QUntypedBindable() [2/5]

QUntypedBindable::QUntypedBindable	(	QObject *	obj,
		const QMetaProperty &	property,
		const QtPrivate::QBindableInterface *	i )

explicitprotected

Definition at line 2508 of file qproperty.cpp.

References QMetaProperty::bindable(), QObjectPrivate::connect(), Qt::DirectConnection, QObjectPrivate::get(), QMetaProperty::hasNotifySignal(), iface, QMetaProperty::isBindable(), QMetaProperty::isValid(), QMetaProperty::metaType(), QtPrivate::QBindableInterface::metaType, QMetaProperty::name(), QMetaType::name(), QMetaProperty::notifySignalIndex(), QMetaProperty::propertyIndex(), Q_ASSERT, and qCWarning.

Here is the call graph for this function:

◆ QUntypedBindable() [3/5]

QUntypedBindable::QUntypedBindable	(	QObject *	obj,
		const char *	property,
		const QtPrivate::QBindableInterface *	i )

explicitprotected

Definition at line 2560 of file qproperty.cpp.

References property, and qCWarning.

◆ QUntypedBindable() [4/5]

QUntypedBindable::QUntypedBindable ( )

constexprdefault

Default-constructs a QUntypedBindable.

It is in an invalid state.

See also: isValid()

◆ QUntypedBindable() [5/5]

template<typename Property >

template< typename Property > QUntypedBindable::QUntypedBindable ( Property * property )

inline

Constructs a QUntypedBindable from the property property.

If Property is const, the QUntypedBindable will be read only. If property is null, the QUntypedBindable will be invalid.

See also: isValid(), isReadOnly()

Definition at line 694 of file qproperty.h.

References iface, and Q_ASSERT.

Member Function Documentation

◆ addNotifier()

template<typename Functor >

template< typename Functor > QPropertyNotifier QUntypedBindable::addNotifier ( Functor f )

inline

Installs f as a change handler.

Whenever the underlying property changes, f will be called, as long as the returned QPropertyNotifier and the property are kept alive.

This method is in some cases easier to use than onValueChanged(), as the returned object is not a template. It can therefore more easily be stored, e.g. as a member in a class.

See also: onValueChanged(), subscribe()

Definition at line 750 of file qproperty.h.

References observe().

Here is the call graph for this function:

◆ binding()

QUntypedPropertyBinding QUntypedBindable::binding ( ) const

inline

Returns the underlying property's binding if there is any, or a default constructed QUntypedPropertyBinding otherwise.

See also: hasBinding()

Definition at line 757 of file qproperty.h.

References QtPrivate::QBindableInterface::getBinding, iface, isBindable(), QtPrivate::BindableWarnings::NonBindableInterface, and QtPrivate::BindableWarnings::printUnsuitableBindableWarning().

Referenced by BindingFixer::BindingFixer(), QBindable< T >::binding(), hasBinding(), QQmlAnyBinding::ofProperty(), QQmlAnyBinding::ofProperty(), setBinding(), and takeBinding().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ hasBinding()

bool QUntypedBindable::hasBinding ( ) const

inline

Returns true if the underlying property has a binding.

Definition at line 787 of file qproperty.h.

References binding(), and QUntypedPropertyBinding::isNull().

Here is the call graph for this function:

◆ isBindable()

bool QUntypedBindable::isBindable ( ) const

inline

Returns true if the underlying property's binding can be queried with binding() and, if not read-only, changed with setBinding. Only QObjectComputedProperty currently leads to this method returning false.

See also: isReadOnly()

Definition at line 700 of file qproperty.h.

References QtPrivate::QBindableInterface::getBinding, and iface.

Referenced by binding().

Here is the caller graph for this function:

◆ isReadOnly()

bool QUntypedBindable::isReadOnly ( ) const

inline

Since: 6.1

Returns true if the QUntypedBindable is read-only.

Definition at line 701 of file qproperty.h.

References iface, QtPrivate::QBindableInterface::setBinding, and QtPrivate::QBindableInterface::setObserver.

Referenced by setBinding().

Here is the caller graph for this function:

◆ isValid()

bool QUntypedBindable::isValid ( ) const

inline

Returns true if the QUntypedBindable is valid.

Methods called on an invalid QUntypedBindable generally have no effect, unless otherwise noted.

Definition at line 699 of file qproperty.h.

◆ makeBinding()

QUntypedPropertyBinding QUntypedBindable::makeBinding ( const QPropertyBindingSourceLocation & location = QT_PROPERTY_DEFAULT_BINDING_LOCATION ) const

inline

Creates a binding returning the underlying properties' value, using a specified source location.

Definition at line 703 of file qproperty.h.

References iface, and QtPrivate::QBindableInterface::makeBinding.

Referenced by QBindable< T >::makeBinding().

Here is the caller graph for this function:

◆ metaType()

QMetaType QUntypedBindable::metaType ( ) const

inline

Since: 6.2

Returns the metatype of the property from which the QUntypedBindable was created. If the bindable is invalid, an invalid metatype will be returned.

See also: isValid() !; QUntypedPropertyBinding::valueMetaType()

Definition at line 792 of file qproperty.h.

References QtPrivate::QBindableInterface::getter, iface, QtPrivate::QBindableInterface::metaType, QtPrivate::QBindableInterface::MetaTypeAccessorFlag, and Q_ASSERT.

Referenced by QBindable< T >::QBindable(), QBindable< T >::setBinding(), and setBinding().

Here is the caller graph for this function:

◆ observe()

void QUntypedBindable::observe ( QPropertyObserver * observer ) const

inline

Installs the observer on the underlying property.

Definition at line 723 of file qproperty.h.

References iface, QtPrivate::BindableWarnings::InvalidInterface, QtPrivate::BindableWarnings::printUnsuitableBindableWarning(), and QtPrivate::QBindableInterface::setObserver.

Referenced by addNotifier(), and onValueChanged().

Here is the call graph for this function:

Here is the caller graph for this function:

◆ onValueChanged()

template<typename Functor >

template< typename Functor > QPropertyChangeHandler< Functor > QUntypedBindable::onValueChanged ( Functor f ) const

inline

Installs f as a change handler.

Whenever the underlying property changes, f will be called, as long as the returned QPropertyChangeHandler and the property are kept alive. On each value change, the handler is either called immediately, or deferred, depending on the context.