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Internal/Contributor docs for the Qt SDK. <b>Note:</b> These are NOT official API docs; those are found <a href='https://doc.qt.io/'>here</a>.
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Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | Friends | List of all members
QQmlBinding Class Referenceabstract

#include <qqmlbinding_p.h>

+ Inheritance diagram for QQmlBinding:
+ Collaboration diagram for QQmlBinding:

Public Types

enum  { Invalid = -1 }
 
typedef QExplicitlySharedDataPointer< QQmlBinding > Ptr
 
typedef int Identifier
 
- Public Types inherited from QQmlAbstractBinding
enum  Kind { ValueTypeProxy , QmlBinding , PropertyToPropertyBinding }
 
enum  TargetTag { NoTargetTag = 0x0 , UpdatingBinding = 0x1 , BindingEnabled = 0x2 }
 
enum  NextBindingTag { NoBindingTag = 0x0 , AddedToObject = 0x1 , CanUseAccessor = 0x2 }
 
typedef QExplicitlySharedDataPointer< QQmlAbstractBinding > Ptr
 

Public Member Functions

Kind kind () const final
 
 ~QQmlBinding () override
 
bool mustCaptureBindableProperty () const final
 
void refresh () override
 
void setEnabled (bool, QQmlPropertyData::WriteFlags flags=QQmlPropertyData::DontRemoveBinding) override
 
QString expression () const override
 
void update (QQmlPropertyData::WriteFlags flags=QQmlPropertyData::DontRemoveBinding)
 
QVariant evaluate ()
 
bool evaluate (void *result, QMetaType type)
 
void expressionChanged () override
 
QQmlSourceLocation sourceLocation () const override
 
void setSourceLocation (const QQmlSourceLocation &location)
 
void setBoundFunction (QV4::BoundFunction *boundFunction)
 
bool hasBoundFunction () const
 
QVector< QQmlProperty > dependencies () const
 
virtual bool hasDependencies () const
 
- Public Member Functions inherited from QQmlJavaScriptExpression
 QQmlJavaScriptExpression ()
 
virtual ~QQmlJavaScriptExpression ()
 
virtual QString expressionIdentifier () const
 
QV4::ReturnedValue evaluate (bool *isUndefined)
 
QV4::ReturnedValue evaluate (QV4::CallData *callData, bool *isUndefined)
 
bool evaluate (void **a, const QMetaType *types, int argc)
 
bool notifyOnValueChanged () const
 
void setNotifyOnValueChanged (bool v)
 
void resetNotifyOnValueChanged ()
 
QObject * scopeObject () const
 
void setScopeObject (QObject *v)
 
bool hasContext () const
 
bool hasValidContext () const
 
QQmlContext * publicContext () const
 
QQmlRefPointer< QQmlContextData > context () const
 
void setContext (const QQmlRefPointer< QQmlContextData > &context)
 
void insertIntoList (QQmlJavaScriptExpression **listHead)
 
QV4::Function * function () const
 
bool hasError () const
 
bool hasDelayedError () const
 
QQmlError error (QQmlEngine *) const
 
void clearError ()
 
void clearActiveGuards ()
 
QQmlDelayedError * delayedError ()
 
QQmlEngine * engine () const
 
bool hasUnresolvedNames () const
 
bool needsPropertyChangeTrigger (QObject *target, int propertyIndex)
 
QPropertyChangeTrigger * allocatePropertyChangeTrigger (QObject *target, int propertyIndex)
 
- Public Member Functions inherited from QQmlAbstractBinding
virtual ~QQmlAbstractBinding ()
 
QQmlPropertyIndex targetPropertyIndex () const
 
QObject * targetObject () const
 
void setTarget (const QQmlProperty &)
 
bool setTarget (QObject *, const QQmlPropertyData &, const QQmlPropertyData *valueType)
 
bool setTarget (QObject *, int coreIndex, bool coreIsAlias, int valueTypeIndex)
 
void addToObject ()
 Add this binding to object.
 
void removeFromObject ()
 Remove the binding from the object.
 
QQmlAbstractBinding * nextBinding () const
 
bool canUseAccessor () const
 
void setCanUseAccessor (bool canUseAccessor)
 

Static Public Member Functions

static QQmlBinding * create (const QQmlPropertyData *, const QQmlScriptString &, QObject *, QQmlContext *)
 
static QQmlBinding * create (const QQmlPropertyData *, const QString &, QObject *, const QQmlRefPointer< QQmlContextData > &, const QString &url=QString(), quint16 lineNumber=0)
 
static QQmlBinding * create (const QQmlPropertyData *property, QV4::Function *function, QObject *obj, const QQmlRefPointer< QQmlContextData > &ctxt, QV4::ExecutionContext *scope)
 
static QQmlBinding * create (QMetaType propertyType, QV4::Function *function, QObject *obj, const QQmlRefPointer< QQmlContextData > &ctxt, QV4::ExecutionContext *scope)
 
static QQmlBinding * createTranslationBinding (const QQmlRefPointer< QV4::ExecutableCompilationUnit > &unit, const QV4::CompiledData::Binding *binding, QObject *obj, const QQmlRefPointer< QQmlContextData > &ctxt)
 
static QQmlBinding * createTranslationBinding (const QQmlRefPointer< QV4::ExecutableCompilationUnit > &unit, const QQmlRefPointer< QQmlContextData > &ctxt, const QString &propertyName, const QQmlTranslation &translationData, const QQmlSourceLocation &location, QObject *obj)
 
- Static Public Member Functions inherited from QQmlJavaScriptExpression
static QV4::ReturnedValue evalFunction (const QQmlRefPointer< QQmlContextData > &ctxt, QObject *scope, const QString &code, const QString &filename, quint16 line)
 
- Static Public Member Functions inherited from QQmlAbstractBinding
static void printBindingLoopError (const QQmlProperty &prop)
 

Protected Member Functions

virtual void doUpdate (const DeleteWatcher &watcher, QQmlPropertyData::WriteFlags flags, QV4::Scope &scope)
 
virtual bool write (const QV4::Value &result, bool isUndefined, QQmlPropertyData::WriteFlags flags)=0
 
virtual bool write (void *result, QMetaType type, bool isUndefined, QQmlPropertyData::WriteFlags flags)=0
 
int getPropertyType () const
 
bool slowWrite (const QQmlPropertyData &core, const QQmlPropertyData &valueTypeData, const QV4::Value &result, bool isUndefined, QQmlPropertyData::WriteFlags flags)
 
bool slowWrite (const QQmlPropertyData &core, const QQmlPropertyData &valueTypeData, const void *result, QMetaType resultType, bool isUndefined, QQmlPropertyData::WriteFlags flags)
 
QV4::ReturnedValue evaluate (bool *isUndefined)
 
- Protected Member Functions inherited from QQmlJavaScriptExpression
void createQmlBinding (const QQmlRefPointer< QQmlContextData > &ctxt, QObject *scope, const QString &code, const QString &filename, quint16 line)
 
void setupFunction (QV4::ExecutionContext *qmlContext, QV4::Function *f)
 
void setCompilationUnit (const QQmlRefPointer< QV4::ExecutableCompilationUnit > &compilationUnit)
 
- Protected Member Functions inherited from QQmlAbstractBinding
 QQmlAbstractBinding ()
 
void setAddedToObject (bool v)
 
bool isAddedToObject () const
 
void setNextBinding (QQmlAbstractBinding *)
 
void getPropertyData (const QQmlPropertyData **propertyData, QQmlPropertyData *valueTypeData) const
 
bool updatingFlag () const
 
void setUpdatingFlag (bool)
 
bool enabledFlag () const
 
void setEnabledFlag (bool)
 
void updateCanUseAccessor ()
 

Friends

class QQmlAbstractBinding
 

Additional Inherited Members

- Public Attributes inherited from QQmlAbstractBinding
RefCount ref
 
- Protected Types inherited from QQmlJavaScriptExpression
enum  GuardTag { NoGuardTag , NotifyOnValueChanged }
 
enum  Tag { NoTag , InEvaluationLoop }
 
- Protected Attributes inherited from QQmlJavaScriptExpression
QBiPointer< QObject, DeleteWatcher > m_scopeObject
 
QForwardFieldList< QQmlJavaScriptExpressionGuard, &QQmlJavaScriptExpressionGuard::next, GuardTag > activeGuards
 
QTaggedPointer< QQmlDelayedError, Tag > m_error
 
TriggerList * qpropertyChangeTriggers = nullptr
 
- Protected Attributes inherited from QQmlAbstractBinding
QQmlPropertyIndex m_targetIndex
 
QTaggedPointer< QObject, TargetTags > m_target
 
QTaggedPointer< QQmlAbstractBinding, NextBindingTags > m_nextBinding
 

Detailed Description

Definition at line 32 of file qqmlbinding_p.h.

Member Typedef Documentation

◆ Identifier

typedef int QQmlBinding::Identifier

Definition at line 76 of file qqmlbinding_p.h.

◆ Ptr

typedef QExplicitlySharedDataPointer<QQmlBinding> QQmlBinding::Ptr

Definition at line 37 of file qqmlbinding_p.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum
Enumerator
Invalid 

Definition at line 77 of file qqmlbinding_p.h.

Constructor & Destructor Documentation

◆ ~QQmlBinding()

QQmlBinding::~QQmlBinding ( )
override

Definition at line 127 of file qqmlbinding.cpp.

Member Function Documentation

◆ create() [1/4]

QT_BEGIN_NAMESPACE QQmlBinding * QQmlBinding::create ( const QQmlPropertyData * property,
const QQmlScriptString & script,
QObject * obj,
QQmlContext * ctxt )
static

Definition at line 35 of file qqmlbinding.cpp.

References QV4::QmlContext::create(), engine, QQmlContextData::get(), QQmlEnginePrivate::get(), Invalid, property, qmlContext(), QV4::ExecutionEngine::rootContext(), and url.

Referenced by QQuickAnchorChanges::actions(), QQuickPropertyChanges::actions(), QQuickPropertyChanges::changeExpression(), QQmlCppBinding::createBindingForNonBindable(), QQmlAnyBinding::createFromCodeString(), QQmlAnyBinding::createFromFunction(), QQmlAnyBinding::createFromScriptString(), QV4::QObjectWrapper::setProperty(), and QV4::QQmlValueTypeWrapper::virtualPut().

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◆ create() [2/4]

QQmlBinding * QQmlBinding::create ( const QQmlPropertyData * property,
const QString & str,
QObject * obj,
const QQmlRefPointer< QQmlContextData > & ctxt,
const QString & url = QString(),
quint16 lineNumber = 0 )
static

Definition at line 89 of file qqmlbinding.cpp.

References property, str, and url.

◆ create() [3/4]

QQmlBinding * QQmlBinding::create ( const QQmlPropertyData * property,
QV4::Function * function,
QObject * obj,
const QQmlRefPointer< QQmlContextData > & ctxt,
QV4::ExecutionContext * scope )
static

Definition at line 104 of file qqmlbinding.cpp.

References create(), QQmlJavaScriptExpression::function(), and property.

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◆ create() [4/4]

QQmlBinding * QQmlBinding::create ( QMetaType propertyType,
QV4::Function * function,
QObject * obj,
const QQmlRefPointer< QQmlContextData > & ctxt,
QV4::ExecutionContext * scope )
static

Definition at line 111 of file qqmlbinding.cpp.

References Q_ASSERT.

◆ createTranslationBinding() [1/2]

QQmlBinding * QQmlBinding::createTranslationBinding ( const QQmlRefPointer< QV4::ExecutableCompilationUnit > & unit,
const QQmlRefPointer< QQmlContextData > & ctxt,
const QString & propertyName,
const QQmlTranslation & translationData,
const QQmlSourceLocation & location,
QObject * obj )
static

Definition at line 391 of file qqmlbinding.cpp.

References Q_UNUSED, and QQmlJavaScriptExpression::QQmlTranslationBindingFromTranslationInfo.

◆ createTranslationBinding() [2/2]

QQmlBinding * QQmlBinding::createTranslationBinding ( const QQmlRefPointer< QV4::ExecutableCompilationUnit > & unit,
const QV4::CompiledData::Binding * binding,
QObject * obj,
const QQmlRefPointer< QQmlContextData > & ctxt )
static

Definition at line 371 of file qqmlbinding.cpp.

References QQmlJavaScriptExpression::QQmlTranslationBindingFromBinding.

Referenced by QQuickPropertyChanges::actions(), and QQmlCppBinding::createTranslationBindingForNonBindable().

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◆ dependencies()

QVector< QQmlProperty > QQmlBinding::dependencies ( ) const

This method returns a snapshot of the currently tracked dependencies of this binding. The dependencies can change upon reevaluation. This method is used in GammaRay to visualize binding hierarchies.

Call this method from the UI thread.

Definition at line 629 of file qqmlbinding.cpp.

References QQmlJavaScriptExpression::activeGuards, QTaggedPointer< T, Tag >::data(), dependencies(), QForwardFieldList< N, nextMember, Tag >::first(), QString::fromUtf8(), i, QMetaProperty::isValid(), QQmlAbstractBinding::m_target, QMetaProperty::name(), QForwardFieldList< N, nextMember, Tag >::next(), TriggerList::next, property, QQmlJavaScriptExpression::qpropertyChangeTriggers, and QMetaObjectPrivate::signal().

Referenced by dependencies().

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◆ doUpdate()

void QQmlBinding::doUpdate ( const DeleteWatcher & watcher,
QQmlPropertyData::WriteFlags flags,
QV4::Scope & scope )
protectedvirtual

Reimplemented in QQmlTranslationBinding.

Definition at line 669 of file qqmlbinding.cpp.

References QV4::Function::AotCompiled, QV4::Function::aotCompiledFunction, QQmlJavaScriptExpression::clearError(), QTaggedPointer< T, Tag >::data(), QQmlJavaScriptExpression::delayedError(), QV4::Scope::engine, QQmlJavaScriptExpression::engine(), error, evaluate(), QQmlJavaScriptExpression::function(), QQmlEnginePrivate::get(), hasBoundFunction(), QQmlJavaScriptExpression::hasError(), QQmlAbstractBinding::isAddedToObject(), QV4::Function::kind, QQmlAbstractBinding::m_target, QMetaType::NeedsConstruction, QMetaType::NeedsDestruction, Q_ALLOCA_VAR, Q_LIKELY, QQmlDelayedError::setErrorLocation(), QQmlDelayedError::setErrorObject(), sourceLocation(), QV4::Function::AOTCompiledFunction::types, QV4::Encode::undefined(), watcher, and write().

Referenced by update().

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◆ evaluate() [1/3]

QVariant QQmlBinding::evaluate ( )

Definition at line 587 of file qqmlbinding.cpp.

References QQmlEnginePrivate::dereferenceScarceResources(), QQmlJavaScriptExpression::engine(), QQmlJavaScriptExpression::evaluate(), QMetaType::fromType(), QQmlEnginePrivate::get(), QJSEngine::handle(), qmlEngine(), QQmlEnginePrivate::referenceScarceResources(), and QV4::ExecutionEngine::toVariant().

Referenced by doUpdate(), QQmlBind::setObject(), and QQuickStateGroupPrivate::updateAutoState().

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◆ evaluate() [2/3]

QV4::ReturnedValue QQmlBinding::evaluate ( bool * isUndefined)
protected

Definition at line 170 of file qqmlbinding.cpp.

References args, QList< T >::data(), QQmlJavaScriptExpression::engine(), QQmlJavaScriptExpression::evaluate(), QJSEngine::handle(), QList< T >::size(), and QV4::PersistentValue::valueRef().

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◆ evaluate() [3/3]

bool QQmlBinding::evaluate ( void * result,
QMetaType type )
inline

Definition at line 82 of file qqmlbinding_p.h.

References QQmlJavaScriptExpression::evaluate().

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◆ expression()

QString QQmlBinding::expression ( ) const
overridevirtual

Reimplemented from QQmlAbstractBinding.

Definition at line 624 of file qqmlbinding.cpp.

References QStringLiteral.

◆ expressionChanged()

void QQmlBinding::expressionChanged ( )
overridevirtual

Implements QQmlJavaScriptExpression.

Definition at line 603 of file qqmlbinding.cpp.

References update().

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◆ getPropertyType()

int QQmlBinding::getPropertyType ( ) const
protected

◆ hasBoundFunction()

bool QQmlBinding::hasBoundFunction ( ) const
inline

Definition at line 94 of file qqmlbinding_p.h.

Referenced by doUpdate().

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◆ hasDependencies()

bool QQmlBinding::hasDependencies ( ) const
virtual

Reimplemented in QQmlTranslationBinding.

Definition at line 664 of file qqmlbinding.cpp.

References QQmlJavaScriptExpression::activeGuards, QForwardFieldList< N, nextMember, Tag >::isEmpty(), and QQmlJavaScriptExpression::qpropertyChangeTriggers.

Referenced by QQmlObjectCreator::finalize().

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◆ kind()

Kind QQmlBinding::kind ( ) const
inlinefinalvirtual

Implements QQmlAbstractBinding.

Definition at line 65 of file qqmlbinding_p.h.

References QQmlAbstractBinding::QmlBinding.

◆ mustCaptureBindableProperty()

bool QQmlBinding::mustCaptureBindableProperty ( ) const
inlinefinalvirtual

Reimplemented from QQmlJavaScriptExpression.

Definition at line 69 of file qqmlbinding_p.h.

◆ refresh()

void QQmlBinding::refresh ( )
overridevirtual

Reimplemented from QQmlJavaScriptExpression.

Definition at line 608 of file qqmlbinding.cpp.

References update().

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◆ setBoundFunction()

void QQmlBinding::setBoundFunction ( QV4::BoundFunction * boundFunction)
inline

Definition at line 91 of file qqmlbinding_p.h.

Referenced by QV4::QObjectWrapper::setProperty(), and QV4::QQmlValueTypeWrapper::virtualPut().

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◆ setEnabled()

void QQmlBinding::setEnabled ( bool e,
QQmlPropertyData::WriteFlags flags = QQmlPropertyData::DontRemoveBinding )
overridevirtual

Implements QQmlAbstractBinding.

Definition at line 613 of file qqmlbinding.cpp.

References QQmlAbstractBinding::enabledFlag(), QQmlAbstractBinding::setEnabledFlag(), QQmlJavaScriptExpression::setNotifyOnValueChanged(), update(), and QQmlAbstractBinding::updateCanUseAccessor().

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◆ setSourceLocation()

void QQmlBinding::setSourceLocation ( const QQmlSourceLocation & location)

Definition at line 81 of file qqmlbinding.cpp.

Referenced by QV4::QObjectWrapper::setProperty(), and QV4::QQmlValueTypeWrapper::virtualPut().

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◆ slowWrite() [1/2]

Q_NEVER_INLINE bool QQmlBinding::slowWrite ( const QQmlPropertyData & core,
const QQmlPropertyData & valueTypeData,
const QV4::Value & result,
bool isUndefined,
QQmlPropertyData::WriteFlags flags )
protected

Definition at line 469 of file qqmlbinding.cpp.

References QV4::Value::as(), QQmlJavaScriptExpression::context(), QQmlPropertyData::coreIndex(), QTaggedPointer< T, Tag >::data(), QQmlJavaScriptExpression::delayedError(), QMetaType::flags(), QJSValuePrivate::fromReturnedValue(), QMetaType::fromType(), QVariant::fromValue(), QQmlVMEMetaObject::get(), QQmlJavaScriptExpression::hasError(), QMetaType::id(), QQmlPropertyData::isQList(), QMetaType::IsQmlList, QQmlPropertyData::isQObject(), QQmlPropertyData::isResettable(), QQmlPropertyData::isValid(), QQmlPropertyData::isVarProperty(), QQmlAbstractBinding::m_target, QMetaType::name(), QQmlPropertyData::propType(), Q_ASSERT, QMetaType::QVariant, QQmlPropertyPrivate::resetValueProperty(), QQmlPropertyPrivate::resolveUrlsOnAssignment(), QQmlDelayedError::setErrorDescription(), QV4::ExecutionEngine::toVariant(), typeName, QQmlPropertyPrivate::urlSequence(), watcher, and QQmlPropertyPrivate::writeValueProperty().

Referenced by QQmlTranslationBinding::doUpdate(), GenericBinding< StaticPropType >::write(), and GenericBinding< StaticPropType >::write().

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◆ slowWrite() [2/2]

bool QQmlBinding::slowWrite ( const QQmlPropertyData & core,
const QQmlPropertyData & valueTypeData,
const void * result,
QMetaType resultType,
bool isUndefined,
QQmlPropertyData::WriteFlags flags )
protected

Definition at line 419 of file qqmlbinding.cpp.

References args, QQmlJavaScriptExpression::context(), QQmlPropertyData::coreIndex(), QTaggedPointer< T, Tag >::data(), QQmlJavaScriptExpression::delayedError(), QQmlJavaScriptExpression::engine(), QString::fromUtf8(), QQmlVMEMetaObject::get(), QJSEngine::handle(), QQmlJavaScriptExpression::hasError(), QQmlPropertyData::isResettable(), QQmlPropertyData::isValid(), QQmlPropertyData::isVarProperty(), QQmlAbstractBinding::m_target, QMetaObject::metacall(), QV4::ExecutionEngine::metaTypeToJS(), QMetaType::name(), QQmlPropertyData::propType(), Q_ASSERT, qmlEngine(), QStringLiteral, QMetaObject::ResetProperty, QQmlDelayedError::setErrorDescription(), typeName, watcher, and QQmlPropertyPrivate::writeValueProperty().

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◆ sourceLocation()

QQmlSourceLocation QQmlBinding::sourceLocation ( ) const
overridevirtual

Reimplemented from QQmlJavaScriptExpression.

Reimplemented in QQmlTranslationBindingFromBinding, and QQmlTranslationBindingFromTranslationInfo.

Definition at line 74 of file qqmlbinding.cpp.

References QQmlJavaScriptExpression::sourceLocation().

Referenced by doUpdate(), and update().

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◆ update()

void QQmlBinding::update ( QQmlPropertyData::WriteFlags flags = QQmlPropertyData::DontRemoveBinding)

Definition at line 132 of file qqmlbinding.cpp.

References QQmlPropertyData::BypassInterceptor, QQmlAbstractBinding::canUseAccessor(), QQmlSourceLocation::column, d, doUpdate(), QQmlAbstractBinding::enabledFlag(), QQmlJavaScriptExpression::engine(), QQmlJavaScriptExpression::function(), QQmlEnginePrivate::get(), QQmlAbstractBinding::getPropertyData(), QJSEngine::handle(), QQmlJavaScriptExpression::hasValidContext(), QQmlSourceLocation::line, QQmlAbstractBinding::printBindingLoopError(), Q_ASSERT, Q_TRACE_SCOPE, Q_UNLIKELY, qmlEngine(), QQmlPropertyPrivate::restore(), QQmlAbstractBinding::setUpdatingFlag(), QQmlSourceLocation::sourceFile, sourceLocation(), QQmlAbstractBinding::targetObject(), QQmlAbstractBinding::updatingFlag(), QQmlData::wasDeleted(), and watcher.

Referenced by expressionChanged(), QQmlTranslationBinding::onLanguageChange(), refresh(), and setEnabled().

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◆ write() [1/2]

virtual bool QQmlBinding::write ( const QV4::Value & result,
bool isUndefined,
QQmlPropertyData::WriteFlags flags )
protectedpure virtual

Implemented in GenericBinding< StaticPropType >, GenericBinding< QMetaType::QString >, and QObjectPointerBinding.

Referenced by doUpdate().

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◆ write() [2/2]

virtual bool QQmlBinding::write ( void * result,
QMetaType type,
bool isUndefined,
QQmlPropertyData::WriteFlags flags )
protectedpure virtual

Implemented in GenericBinding< StaticPropType >, GenericBinding< QMetaType::QString >, and QObjectPointerBinding.

Friends And Related Symbol Documentation

◆ QQmlAbstractBinding

friend class QQmlAbstractBinding
friend

Definition at line 35 of file qqmlbinding_p.h.

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