内容

• 公共函数
• 重实现公共函数
• 详细描述

QScxmlNullDataModel Class

The QScxmlNullDataModel class is the null data model for a Qt SCXML stateMachine 更多...

头：	#include <QScxmlNullDataModel>
qmake:	QT += scxml
Since:	Qt 5.7
继承：	QScxmlDataModel

• 所有成员列表，包括继承成员

公共函数

	QScxmlNullDataModel (QObject * parent = nullptr)
	~QScxmlNullDataModel ()

重实现公共函数

virtual void	evaluateAssignment (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual void	evaluateForeach (QScxmlExecutableContent::EvaluatorId id , bool * ok , ForeachLoopBody * body )
virtual void	evaluateInitialization (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual bool	evaluateToBool (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual QString	evaluateToString (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual QVariant	evaluateToVariant (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual void	evaluateToVoid (QScxmlExecutableContent::EvaluatorId id , bool * ok )
virtual bool	hasScxmlProperty (const QString & name ) const
virtual QVariant	scxmlProperty (const QString & name ) const
virtual void	setScxmlEvent (const QScxmlEvent & event )
virtual bool	setScxmlProperty (const QString & name , const QVariant & value , const QString & context )
virtual bool	setup (const QVariantMap & initialDataValues )

• 14 公共函数继承自 QScxmlDataModel
• 32 公共函数继承自 QObject

额外继承成员

• 1 特性继承自 QScxmlDataModel
• 1 特性继承自 QObject
• 1 公共槽继承自 QObject
• 1 信号继承自 QScxmlDataModel
• 2 信号继承自 QObject
• 11 静态公共成员继承自 QObject
• 9 保护函数继承自 QObject

详细描述

The QScxmlNullDataModel class is the null data model for a Qt SCXML stateMachine

This class implements the null data model as described in the SCXML Specification - B.1 The Null Data Model . Using the value "null" 为 datamodel 属性在 <scxml> element means that there is no underlying data model, but some executable content, like In(...) or <log> can still be used.

另请参阅 QScxmlStateMachine and QScxmlDataModel .

成员函数文档编制

QScxmlNullDataModel:: QScxmlNullDataModel ( QObject * parent = nullptr)

Creates a new Qt SCXML null data model, with the parent object parent .

QScxmlNullDataModel:: ~QScxmlNullDataModel ()

Destroys the data model.

[虚拟] void QScxmlNullDataModel:: evaluateAssignment ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateAssignment ().

Throws an error and sets ok to false , because the null data model cannot evaluate assignments.

[虚拟] void QScxmlNullDataModel:: evaluateForeach ( QScxmlExecutableContent::EvaluatorId id , bool * ok , ForeachLoopBody * body )

重实现自 QScxmlDataModel::evaluateForeach ().

Throws an error and sets ok to false , because the null data model cannot evaluate <foreach> blocks.

[虚拟] void QScxmlNullDataModel:: evaluateInitialization ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateInitialization ().

Throws an error and sets ok to false , because the null data model cannot initialize data.

[虚拟] bool QScxmlNullDataModel:: evaluateToBool ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateToBool ().

Evaluates the executable content pointed to by id and records in ok whether there was an error. Returns the result of the evaluation as a boolean value. The null data model can evaluate the instruction In(...) , so this might result in an actual value, rather than an error.

[虚拟] QString QScxmlNullDataModel:: evaluateToString ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateToString ().

Evaluates the executable content pointed to by id and records in ok whether there was an error. Returns the result of the evaluation as a string. The null data model can evaluate the <log> element, so this might result in an actual value, rather than an error

[虚拟] QVariant QScxmlNullDataModel:: evaluateToVariant ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateToVariant ().

Evaluates the executable content pointed to by id and records in ok whether there was an error. As this is the null data model, any evaluation will in fact result in an error, with ok 设为 false . Returns an empty QVariant .

[虚拟] void QScxmlNullDataModel:: evaluateToVoid ( QScxmlExecutableContent::EvaluatorId id , bool * ok )

重实现自 QScxmlDataModel::evaluateToVoid ().

Evaluates the executable content pointed to by id and records in ok whether there was an error. As this is the null data model, any evaluation will in fact result in an error, with ok 设为 false .

[虚拟] bool QScxmlNullDataModel:: hasScxmlProperty (const QString & name ) const

重实现自 QScxmlDataModel::hasScxmlProperty ().

返回 false , because the null data model does not support properties.

[虚拟] QVariant QScxmlNullDataModel:: scxmlProperty (const QString & name ) const

重实现自 QScxmlDataModel::scxmlProperty ().

Returns an invalid variant, because the null data model does not support properties.

另请参阅 setScxmlProperty ().

[虚拟] void QScxmlNullDataModel:: setScxmlEvent (const QScxmlEvent & event )

重实现自 QScxmlDataModel::setScxmlEvent ().

Does not actually set the event , because the null data model does not handle events.

[虚拟] bool QScxmlNullDataModel:: setScxmlProperty (const QString & name , const QVariant & value , const QString & context )

重实现自 QScxmlDataModel::setScxmlProperty ().

返回 false , because the null data model does not support properties.

另请参阅 scxmlProperty ().

[虚拟] bool QScxmlNullDataModel:: setup (const QVariantMap & initialDataValues )

重实现自 QScxmlDataModel::setup ().