<scxml datamodel="cplusplus:TheDataModel:thedatamodel.h"  ....>

#include "qscxmlcppdatamodel.h"

class TheDataModel: public QScxmlCppDataModel
{
    Q_OBJECT
    Q_SCXML_DATAMODEL
};

<scxml datamodel="cplusplus:TheDataModel:thedatamodel.h" xmlns="http://www.w3.org/2005/07/scxml" version="1.0" name="MediaPlayerStateMachine">
    <state id="stopped">
        <transition event="tap" cond="isValidMedia()" target="playing"/>
    </state>

    <state id="playing">
        <onentry>
            <script>
                media = eventData().value(QStringLiteral(&quot;media&quot;)).toString();
            </script>
            <send event="playbackStarted">
                <param name="media" expr="media"/>
            </send>
        </onentry>
    </state>
</scxml>

bool TheDataModel::evaluateToBool(QScxmlExecutableContent::EvaluatorId id, bool *ok) {
    // ....
        return [this]()->bool{ return isValidMedia(); }();
    // ....
}

QVariant TheDataModel::evaluateToVariant(QScxmlExecutableContent::EvaluatorId id, bool *ok) {
    // ....
        return [this]()->QVariant{ return media; }();
    // ....
}

void TheDataModel::evaluateToVoid(QScxmlExecutableContent::EvaluatorId id, bool *ok) {
    // ....
        [this]()->void{ media = eventData().value(QStringLiteral("media")).toString(); }();
    // ....
}

Member Function Documentation

QScxmlCppDataModel::QScxmlCppDataModel(QObject *parent = nullptr)

Creates a new C++ data model with the parent object parent.

[override virtual] void QScxmlCppDataModel::evaluateAssignment(QScxmlExecutableContent::EvaluatorId id, bool *ok)

Reimplements: QScxmlDataModel::evaluateAssignment(QScxmlExecutableContent::EvaluatorId id, bool *ok).

This method does not perform any action, ignores id, and sets ok to false. Override it in your specific data model in order to implement <assign>.

[override virtual] void QScxmlCppDataModel::evaluateForeach(QScxmlExecutableContent::EvaluatorId id, bool *ok, QScxmlDataModel::ForeachLoopBody *body)

Reimplements: QScxmlDataModel::evaluateForeach(QScxmlExecutableContent::EvaluatorId id, bool *ok, QScxmlDataModel::ForeachLoopBody *body).

This method does not perform any action, ignores id and body, and sets ok to false. Override it in your specific data model in order to implement <foreach>.

[override virtual] void QScxmlCppDataModel::evaluateInitialization(QScxmlExecutableContent::EvaluatorId id, bool *ok)

Reimplements: QScxmlDataModel::evaluateInitialization(QScxmlExecutableContent::EvaluatorId id, bool *ok).

This method does not perform any action, ignores id, and sets ok to false. Override it in your specific data model in order to implement <data>.

[override virtual] bool QScxmlCppDataModel::hasScxmlProperty(const QString &name) const

Reimplements: QScxmlDataModel::hasScxmlProperty(const QString &name) const.

This method always returns false and ignores name. Override it to implement the lookup of data model properties via the location attribute of various elements.

bool QScxmlCppDataModel::inState(const QString &stateName) const

Returns true if the state machine is in the state specified by stateName, false otherwise.

const QScxmlEvent &QScxmlCppDataModel::scxmlEvent() const

Holds the current event that is being processed by the state machine.

See also SCXML Specification - 5.10 System Variables for the description of the _event variable.

Returns the event currently being processed.

See also setScxmlEvent().

[override virtual] QVariant QScxmlCppDataModel::scxmlProperty(const QString &name) const

Reimplements: QScxmlDataModel::scxmlProperty(const QString &name) const.

This method always returns an empty QVariant and ignores name. Override it to implement the lookup of data model properties via the location attribute of various elements.

See also setScxmlProperty().

[override virtual] void QScxmlCppDataModel::setScxmlEvent(const QScxmlEvent &event)

Reimplements: QScxmlDataModel::setScxmlEvent(const QScxmlEvent &event).

Sets the event that will be processed next.

See also QScxmlCppDataModel::scxmlEvent.

[override virtual] bool QScxmlCppDataModel::setScxmlProperty(const QString &name, const QVariant &value, const QString &context)

Reimplements: QScxmlDataModel::setScxmlProperty(const QString &name, const QVariant &value, const QString &context).

This method always returns false and ignores name, value, and context. Override it to implement the lookup of data model properties via the location attribute of various elements.

See also scxmlProperty().

[override virtual] bool QScxmlCppDataModel::setup(const QVariantMap &initialDataValues)

Reimplements: QScxmlDataModel::setup(const QVariantMap &initialDataValues).

Called during state machine initialization to set up a state machine using the initial values for data model variables specified by their keys, initialDataValues. These are the values specified by <param> tags in an <invoke> element.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

See also QScxmlStateMachine::init.