\macro Q_OBJECT_BINDABLE_PROPERTY(containingClass, type, name, signal) More...

#include <qproperty_p.h>

Inheritance diagram for QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >:

Collaboration diagram for QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >:

Public Types
using	value_type = typename QPropertyData<T>::value_type

using	parameter_type = typename QPropertyData<T>::parameter_type

using	arrow_operator_result = typename QPropertyData<T>::arrow_operator_result

Public Types inherited from QPropertyData< T >
using	value_type = T

using	parameter_type = std::conditional_t<UseReferences, const T &, T>

using	rvalue_ref = typename std::conditional_t<UseReferences, T &&, DisableRValueRefs>

using	arrow_operator_result

Public Member Functions
	QObjectCompatProperty ()=default

	QObjectCompatProperty (const T &initialValue)

	QObjectCompatProperty (T &&initialValue)

parameter_type	value () const

arrow_operator_result	operator-> () const

parameter_type	operator* () const

	operator parameter_type () const

void	setValue (parameter_type t)

QObjectCompatProperty &	operator= (parameter_type newValue)

QPropertyBinding< T >	setBinding (const QPropertyBinding< T > &newBinding)

bool	setBinding (const QUntypedPropertyBinding &newBinding)

template<typename Functor >
QPropertyBinding< T >	setBinding (Functor &&f, const QPropertyBindingSourceLocation &location=QT_PROPERTY_DEFAULT_BINDING_LOCATION, std::enable_if_t< std::is_invocable_v< Functor > > *=nullptr)

bool	hasBinding () const

void	removeBindingUnlessInWrapper ()

void	notify ()

QPropertyBinding< T >	binding () const

QPropertyBinding< T >	takeBinding ()

template<typename Functor >
QPropertyChangeHandler< Functor >	onValueChanged (Functor f)

template<typename Functor >
QPropertyChangeHandler< Functor >	subscribe (Functor f)

template<typename Functor >
QPropertyNotifier	addNotifier (Functor f)

QtPrivate::QPropertyBindingData &	bindingData () const

Public Member Functions inherited from QPropertyData< T >
	QPropertyData ()=default

	QPropertyData (parameter_type t)

	QPropertyData (rvalue_ref t)

	~QPropertyData ()=default

parameter_type	valueBypassingBindings () const
	Returns the data stored in this property.

void	setValueBypassingBindings (parameter_type v)
	Sets the data value stored in this property to v.

void	setValueBypassingBindings (rvalue_ref v)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the data value stored in this property to v.

Friends
template<typename Property , typename >
class	QtPrivate::QBindableInterfaceForProperty

Additional Inherited Members
Protected Attributes inherited from QPropertyData< T >
T	val = T()

Static Protected Attributes inherited from QPropertyData< T >
static constexpr bool	UseReferences = !(std::is_arithmetic_v<T> \|\| std::is_enum_v<T> \|\| std::is_pointer_v<T>)

Detailed Description

template<typename Class, typename T, auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>
class QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >

\macro Q_OBJECT_BINDABLE_PROPERTY(containingClass, type, name, signal)

Since: 6.0

Declares a \l QObjectBindableProperty inside containingClass of type type with name name. If the optional argument signal is given, this signal will be emitted when the property is marked dirty.

See also: {Qt's Property System}, {Qt Bindable Properties}

\macro Q_OBJECT_BINDABLE_PROPERTY_WITH_ARGS(containingClass, type, name, initialvalue, signal)

Since: 6.0

Declares a \l QObjectBindableProperty inside containingClass of type type with name name which is initialized to initialvalue. If the optional argument signal is given, this signal will be emitted when the property is marked dirty.

See also: {Qt's Property System}, {Qt Bindable Properties}

\inmodule QtCore

The QObjectCompatProperty class is a template class to help port old properties to the bindable property system.

Since: 6.0

QObjectCompatProperty is a generic container that holds an instance of T and behaves mostly like QProperty, just like QObjectBindableProperty. It's one of the Qt internal classes implementing \l {Qt Bindable Properties}. Like QObjectBindableProperty, QObjectCompatProperty stores its management data structure in the surrounding QObject. The last template parameter specifies a method (of the owning class) to be called when the property is changed through the binding. This is usually a setter.

As explained in \l {Qt Bindable Properties}, getters and setters for bindable properties have to be almost trivial to be correct. However, in legacy code, there is often complex logic in the setter. QObjectCompatProperty is a helper to port these properties to the bindable property system.

With QObjectCompatProperty, the same rules as described in \l {Bindable Property Getters and Setters} hold for the getter. For the setter, the rules are different. It remains that every possible code path in the setter must write to the underlying QObjectCompatProperty, otherwise calling the setter might not remove a pre-existing binding, as it should. However, as QObjectCompatProperty will call the setter on every change, the setter is allowed to contain code like updating class internals or emitting signals. Every write to the QObjectCompatProperty has to be analyzed carefully to comply with the rules given in \l {Writing to a Bindable Property}.

Some of the pre-existing Qt classes (for example, \l QAbstractProxyModel) have properties with virtual setters. Special care must be taken when making such properties bindable.

For the binding to work properly, the property must be correctly handled in all reimplemented methods of each derived class.

Unless the derived class has access to the underlying property object, the base implementation must be called for the binding to work correctly.

If the derived class can directly access the property instance, there is no need to explicitly call the base implementation, but the property's value must be correctly updated.

Refer to \l {Bindable Properties with Virtual Setters and Getters} for more details.

In both cases the expected behavior must be documented in the property's documentation, so that users can correctly override the setter.

Properties for which these conditions cannot be met should not be made bindable.

See also: Q_OBJECT_COMPAT_PROPERTY, QObjectBindableProperty, {Qt's Property System}, {Qt Bindable Properties}

Definition at line 508 of file qproperty_p.h.

Member Typedef Documentation

◆ arrow_operator_result

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

using QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::arrow_operator_result = typename QPropertyData<T>::arrow_operator_result

Definition at line 560 of file qproperty_p.h.

◆ parameter_type

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

using QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::parameter_type = typename QPropertyData<T>::parameter_type

Definition at line 559 of file qproperty_p.h.

◆ value_type

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

using QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::value_type = typename QPropertyData<T>::value_type

Definition at line 558 of file qproperty_p.h.

Constructor & Destructor Documentation

◆ QObjectCompatProperty() [1/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::QObjectCompatProperty ( )

default

◆ QObjectCompatProperty() [2/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::QObjectCompatProperty ( const T & initialValue )

inlineexplicit

Definition at line 563 of file qproperty_p.h.

◆ QObjectCompatProperty() [3/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::QObjectCompatProperty ( T && initialValue )

inlineexplicit

Definition at line 564 of file qproperty_p.h.

Member Function Documentation

◆ addNotifier()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

template<typename Functor >

QPropertyNotifier QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::addNotifier ( Functor f )

inline

Definition at line 717 of file qproperty_p.h.

◆ binding()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QPropertyBinding< T > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::binding ( ) const

inline

Definition at line 690 of file qproperty_p.h.

References QBindingStorage::bindingData(), and qGetBindingStorage().

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◆ bindingData()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QtPrivate::QPropertyBindingData & QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::bindingData ( ) const

inline

Definition at line 723 of file qproperty_p.h.

References qGetBindingStorage(), and storage.

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◆ hasBinding()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

bool QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::hasBinding ( ) const

inline

Definition at line 643 of file qproperty_p.h.

References QtPrivate::QPropertyBindingData::binding(), QBindingStorage::bindingData(), and qGetBindingStorage().

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◆ notify()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

void QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::notify ( )

inline

Definition at line 658 of file qproperty_p.h.

References d, qGetBindingStorage(), and storage.

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◆ onValueChanged()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

template<typename Functor >

QPropertyChangeHandler< Functor > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::onValueChanged ( Functor f )

inline

Definition at line 702 of file qproperty_p.h.

◆ operator parameter_type()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::operator parameter_type ( ) const

inline

Definition at line 592 of file qproperty_p.h.

◆ operator*()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

parameter_type QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::operator* ( ) const

inline

Definition at line 587 of file qproperty_p.h.

◆ operator->()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

arrow_operator_result QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::operator-> ( ) const

inline

Definition at line 575 of file qproperty_p.h.

◆ operator=()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QObjectCompatProperty & QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::operator= ( parameter_type newValue )

inline

Definition at line 608 of file qproperty_p.h.

References setValue().

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◆ removeBindingUnlessInWrapper()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

void QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::removeBindingUnlessInWrapper ( )

inline

Definition at line 648 of file qproperty_p.h.

References qGetBindingStorage(), and storage.

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◆ setBinding() [1/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QPropertyBinding< T > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::setBinding ( const QPropertyBinding< T > & newBinding )

inline

Definition at line 614 of file qproperty_p.h.

References QBindingStorage::bindingData(), and qGetBindingStorage().

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◆ setBinding() [2/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

bool QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::setBinding ( const QUntypedPropertyBinding & newBinding )

inline

Definition at line 622 of file qproperty_p.h.

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

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◆ setBinding() [3/3]

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

template<typename Functor >

QPropertyBinding< T > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::setBinding	(	Functor &&	f,
		const QPropertyBindingSourceLocation &	location = QT_PROPERTY_DEFAULT_BINDING_LOCATION,
		std::enable_if_t< std::is_invocable_v< Functor > > *	= nullptr )

inline

Definition at line 632 of file qproperty_p.h.

References Qt::makePropertyBinding().

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◆ setValue()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

void QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::setValue ( parameter_type t )

inline

Definition at line 597 of file qproperty_p.h.

References qGetBindingStorage(), and storage.

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◆ subscribe()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

template<typename Functor >

QPropertyChangeHandler< Functor > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::subscribe ( Functor f )

inline

Definition at line 709 of file qproperty_p.h.

◆ takeBinding()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

QPropertyBinding< T > QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::takeBinding ( )

inline

Definition at line 696 of file qproperty_p.h.

◆ value()

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

parameter_type QObjectCompatProperty< Class, T, Offset, Setter, Signal, Getter >::value ( ) const

inline

Definition at line 566 of file qproperty_p.h.

References qGetBindingStorage(), and storage.

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Friends And Related Symbol Documentation

◆ QtPrivate::QBindableInterfaceForProperty

template<typename Class , typename T , auto Offset, auto Setter, auto Signal = nullptr, auto Getter = nullptr>

template<typename Property , typename >

friend class QtPrivate::QBindableInterfaceForProperty

friend

Definition at line 511 of file qproperty_p.h.

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

qtbase/src/corelib/kernel/qbindingstorage.h (2c81ba2df95cc07d5d147c8f3c7999c34848d274)
qtbase/src/corelib/kernel/qproperty_p.h (717dc9450ffc13ef8209a10073552ac4574a4160)

Public Types

Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ arrow_operator_result

◆ parameter_type

◆ value_type

Constructor & Destructor Documentation

◆ QObjectCompatProperty() [1/3]

◆ QObjectCompatProperty() [2/3]

◆ QObjectCompatProperty() [3/3]

Member Function Documentation

◆ addNotifier()

◆ binding()

◆ bindingData()

◆ hasBinding()

◆ notify()

◆ onValueChanged()

◆ operator parameter_type()

◆ operator*()

◆ operator->()

◆ operator=()

◆ removeBindingUnlessInWrapper()

◆ setBinding() [1/3]

◆ setBinding() [2/3]

◆ setBinding() [3/3]

◆ setValue()

◆ subscribe()

◆ takeBinding()

◆ value()

Friends And Related Symbol Documentation

◆ QtPrivate::QBindableInterfaceForProperty