The QScxmlDataModel class is the data model base class for a Qt SCXML state machine. 更多...
| 头： | #include <QScxmlDataModel> |
| qmake: | QT += scxml |
| Since: | Qt 5.7 |
| 继承： | QObject |
| 继承者： |
QScxmlCppDataModel , QScxmlEcmaScriptDataModel ，和 QScxmlNullDataModel |
该类在 Qt 5.7 引入。
| class | ForeachLoopBody |
| QScxmlDataModel (QObject * parent = nullptr) | |
| virtual void | evaluateAssignment (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual void | evaluateForeach (QScxmlExecutableContent::EvaluatorId id , bool * ok , QScxmlDataModel::ForeachLoopBody * body ) = 0 |
| virtual void | evaluateInitialization (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual bool | evaluateToBool (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual QString | evaluateToString (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual QVariant | evaluateToVariant (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual void | evaluateToVoid (QScxmlExecutableContent::EvaluatorId id , bool * ok ) = 0 |
| virtual bool | hasScxmlProperty (const QString & name ) const = 0 |
| virtual QVariant | scxmlProperty (const QString & name ) const = 0 |
| virtual void | setScxmlEvent (const QScxmlEvent & event ) = 0 |
| virtual bool | setScxmlProperty (const QString & name , const QVariant & value , const QString & context ) = 0 |
| void | setStateMachine (QScxmlStateMachine * stateMachine ) |
| virtual bool | setup (const QVariantMap & initialDataValues ) = 0 |
| QScxmlStateMachine * | stateMachine () const |
| void | stateMachineChanged (QScxmlStateMachine * stateMachine ) |
| QScxmlDataModel (QScxmlDataModelPrivate & dd , QObject * parent = nullptr) |
SCXML data models are described in SCXML Specification - 5 Data Model and Data Manipulation . For more information about supported data models, see SCXML 合规 .
One data model can only belong to one state machine.
另请参阅 QScxmlStateMachine , QScxmlCppDataModel , QScxmlEcmaScriptDataModel ，和 QScxmlNullDataModel .
This property holds the state machine this data model belongs to.
A data model can only belong to a single state machine and a state machine can only have one data model. This relation needs to be set up before the state machine is started. Setting this property on a data model will automatically set the corresponding
dataModel
property on the
stateMachine
.
访问函数：
| QScxmlStateMachine * | stateMachine () const |
| void | setStateMachine (QScxmlStateMachine * stateMachine ) |
通知程序信号：
| void | stateMachineChanged (QScxmlStateMachine * stateMachine ) |
[protected]
QScxmlDataModel::
QScxmlDataModel
(
QScxmlDataModelPrivate
&
dd
,
QObject
*
parent
= nullptr)
Creates a new data model from the private object dd , with the parent object parent .
Creates a new data model, with the parent object parent .
[pure virtual]
void
QScxmlDataModel::
evaluateAssignment
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the assignment pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not.
[pure virtual]
void
QScxmlDataModel::
evaluateForeach
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
,
QScxmlDataModel::ForeachLoopBody
*
body
)
Evaluates the foreach loop pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not. The
body
is executed on each iteration.
[pure virtual]
void
QScxmlDataModel::
evaluateInitialization
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the initialization pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not.
[pure virtual]
bool
QScxmlDataModel::
evaluateToBool
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the executable content pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not. Returns the result of the evaluation as a boolean value.
[pure virtual]
QString
QScxmlDataModel::
evaluateToString
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the executable content pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not. Returns the result of the evaluation as a
QString
.
[pure virtual]
QVariant
QScxmlDataModel::
evaluateToVariant
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the executable content pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not. Returns the result of the evaluation as a
QVariant
.
[pure virtual]
void
QScxmlDataModel::
evaluateToVoid
(
QScxmlExecutableContent::EvaluatorId
id
,
bool
*
ok
)
Evaluates the executable content pointed to by
id
并设置
ok
to
false
if there was an error or to
true
if there was not. The execution is expected to return no result.
[pure virtual]
bool
QScxmlDataModel::
hasScxmlProperty
(const
QString
&
name
) const
返回
true
if a property with the given
name
exists,
false
否则。
[pure virtual]
QVariant
QScxmlDataModel::
scxmlProperty
(const
QString
&
name
) const
Returns the value of the property name .
另请参阅 setScxmlProperty ().
[pure virtual]
void
QScxmlDataModel::
setScxmlEvent
(const
QScxmlEvent
&
event
)
设置 event to use in the subsequent executable content execution.
[pure virtual]
bool
QScxmlDataModel::
setScxmlProperty
(const
QString
&
name
, const
QVariant
&
value
, const
QString
&
context
)
Sets a the value value for the property name .
The context is a string that is used in error messages to indicate the location in the SCXML file where the error occurred.
返回
true
if successful or
false
if an error occurred.
另请参阅 scxmlProperty ().
Sets the state machine this model belongs to to stateMachine . There is a 1:1 relation between state machines and models. After setting the state machine once you cannot change it anymore. Any further attempts to set the state machine using this method will be ignored.
注意： setter 函数对于特性 stateMachine .
另请参阅 stateMachine ().
[pure virtual]
bool
QScxmlDataModel::
setup
(const
QVariantMap
&
initialDataValues
)
Initializes the data model with the initial values specified by initialDataValues .
返回
false
if parse errors occur or if any of the initialization steps fail. Returns
true
否则。
注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .
Returns the state machine associated with the data model.
注意： Getter function for property stateMachine.
另请参阅 setStateMachine ().