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| ** Alternatively, this file may be used under the terms of the GNU |
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| |
| #include "statemachineloader_p.h" |
| |
| #include <QtScxml/qscxmlstatemachine.h> |
| #include <qqmlcontext.h> |
| #include <qqmlengine.h> |
| #include <qqmlinfo.h> |
| #include <qqmlfile.h> |
| #include <qbuffer.h> |
| |
| /*! |
| \qmltype StateMachineLoader |
| \instantiates QScxmlStateMachineLoader |
| \inqmlmodule QtScxml |
| |
| \brief Dynamically loads an SCXML document and instantiates the state machine. |
| |
| \since QtScxml 5.7 |
| */ |
| |
| QScxmlStateMachineLoader::QScxmlStateMachineLoader(QObject *parent) |
| : QObject(parent) |
| , m_dataModel(nullptr) |
| , m_implicitDataModel(nullptr) |
| , m_stateMachine(nullptr) |
| { |
| } |
| |
| /*! |
| \qmlproperty ScxmlStateMachine StateMachineLoader::stateMachine |
| |
| The state machine instance. |
| */ |
| QT_PREPEND_NAMESPACE(QScxmlStateMachine) *QScxmlStateMachineLoader::stateMachine() const |
| { |
| return m_stateMachine; |
| } |
| |
| /*! |
| \qmlproperty url StateMachineLoader::source |
| |
| The URL of the SCXML document to load. Only synchronously accessible URLs |
| are supported. |
| */ |
| QUrl QScxmlStateMachineLoader::source() |
| { |
| return m_source; |
| } |
| |
| void QScxmlStateMachineLoader::setSource(const QUrl &source) |
| { |
| if (!source.isValid()) |
| return; |
| |
| QUrl oldSource = m_source; |
| if (m_stateMachine) { |
| delete m_stateMachine; |
| m_stateMachine = nullptr; |
| m_implicitDataModel = nullptr; |
| } |
| |
| if (parse(source)) { |
| m_source = source; |
| emit sourceChanged(); |
| } else { |
| m_source.clear(); |
| if (!oldSource.isEmpty()) { |
| emit sourceChanged(); |
| } |
| } |
| } |
| |
| QVariantMap QScxmlStateMachineLoader::initialValues() const |
| { |
| return m_initialValues; |
| } |
| |
| void QScxmlStateMachineLoader::setInitialValues(const QVariantMap &initialValues) |
| { |
| if (initialValues != m_initialValues) { |
| m_initialValues = initialValues; |
| if (m_stateMachine) |
| m_stateMachine->setInitialValues(initialValues); |
| emit initialValuesChanged(); |
| } |
| } |
| |
| QScxmlDataModel *QScxmlStateMachineLoader::dataModel() const |
| { |
| return m_dataModel; |
| } |
| |
| void QScxmlStateMachineLoader::setDataModel(QScxmlDataModel *dataModel) |
| { |
| if (dataModel != m_dataModel) { |
| m_dataModel = dataModel; |
| if (m_stateMachine) { |
| if (dataModel) |
| m_stateMachine->setDataModel(dataModel); |
| else |
| m_stateMachine->setDataModel(m_implicitDataModel); |
| } |
| emit dataModelChanged(); |
| } |
| } |
| |
| bool QScxmlStateMachineLoader::parse(const QUrl &source) |
| { |
| if (!QQmlFile::isSynchronous(source)) { |
| qmlWarning(this) << QStringLiteral("Cannot open '%1' for reading: only synchronous access is supported.") |
| .arg(source.url()); |
| return false; |
| } |
| QQmlFile scxmlFile(QQmlEngine::contextForObject(this)->engine(), source); |
| if (scxmlFile.isError()) { |
| // the synchronous case can only fail when the file is not found (or not readable). |
| qmlWarning(this) << QStringLiteral("Cannot open '%1' for reading.").arg(source.url()); |
| return false; |
| } |
| |
| QByteArray data(scxmlFile.dataByteArray()); |
| QBuffer buf(&data); |
| if (!buf.open(QIODevice::ReadOnly)) { |
| qmlWarning(this) << QStringLiteral("Cannot open input buffer for reading"); |
| return false; |
| } |
| |
| QString fileName; |
| if (source.isLocalFile()) { |
| fileName = source.toLocalFile(); |
| } else if (source.scheme() == QStringLiteral("qrc")) { |
| fileName = ":" + source.path(); |
| } else { |
| qmlWarning(this) << QStringLiteral("%1 is neither a local nor a resource URL.") |
| .arg(source.url()) |
| << QStringLiteral("Invoking services by relative path will not work."); |
| } |
| |
| m_stateMachine = QScxmlStateMachine::fromData(&buf, fileName); |
| m_stateMachine->setParent(this); |
| m_implicitDataModel = m_stateMachine->dataModel(); |
| |
| if (m_stateMachine->parseErrors().isEmpty()) { |
| if (m_dataModel) |
| m_stateMachine->setDataModel(m_dataModel); |
| m_stateMachine->setInitialValues(m_initialValues); |
| emit stateMachineChanged(); |
| |
| // as this is deferred any pending property updates to m_dataModel and m_initialValues |
| // should still occur before start(). |
| QMetaObject::invokeMethod(m_stateMachine, "start", Qt::QueuedConnection); |
| return true; |
| } else { |
| qmlWarning(this) << QStringLiteral("Something went wrong while parsing '%1':") |
| .arg(source.url()) |
| << Qt::endl; |
| const auto errors = m_stateMachine->parseErrors(); |
| for (const QScxmlError &error : errors) { |
| qmlWarning(this) << error.toString(); |
| } |
| |
| emit stateMachineChanged(); |
| return false; |
| } |
| } |