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/**
* @file OpcUaMonitoredNode.h
* @brief QML component for monitoring a single OPC UA node.
*
* Inherits QObject + QQmlParserStatus so that initialisation is
* deferred until all QML bindings are applied (componentComplete).
*/
#ifndef OPCUAMONITOREDNODE_H
#define OPCUAMONITOREDNODE_H
#include <QDateTime>
#include <QObject>
#include <QOpcUaNode>
#include <QQmlEngine>
#include <QQmlParserStatus>
#include <QVariant>
/**
* @brief Metadata bundle for a monitored OPC UA node.
*
* Exposed as a single Q_PROPERTY on OpcUaMonitoredNode so that
* the QML API stays simple (only `value` is top-level).
* Advanced users can access fields via dot notation:
* node.info.displayName, node.info.status, etc.
*/
struct OpcUaNodeInfo
{
Q_GADGET
Q_PROPERTY (QString displayName MEMBER displayName)
Q_PROPERTY (QString description MEMBER description)
Q_PROPERTY (QString nodeClass MEMBER nodeClass)
Q_PROPERTY (QString dataType MEMBER dataType)
Q_PROPERTY (QString accessLevel MEMBER accessLevel)
Q_PROPERTY (QString status MEMBER status)
Q_PROPERTY (QDateTime sourceTimestamp MEMBER sourceTimestamp)
Q_PROPERTY (QDateTime serverTimestamp MEMBER serverTimestamp)
public:
QString displayName;
QString description;
QString nodeClass;
QString dataType;
QString accessLevel;
QString status;
QDateTime sourceTimestamp;
QDateTime serverTimestamp;
};
Q_DECLARE_METATYPE (OpcUaNodeInfo)
class OpcUaMonitoredNode : public QObject, public QQmlParserStatus
{
Q_OBJECT
Q_INTERFACES (QQmlParserStatus)
QML_ELEMENT
Q_PROPERTY (QString nodeId READ nodeId WRITE setNodeId NOTIFY nodeIdChanged)
Q_PROPERTY (
bool monitored READ monitored WRITE setMonitored NOTIFY monitoredChanged)
Q_PROPERTY (QVariant value READ value NOTIFY valueChanged)
Q_PROPERTY (bool writable READ writable NOTIFY writableChanged)
Q_PROPERTY (OpcUaNodeInfo info READ info NOTIFY infoChanged)
public:
explicit OpcUaMonitoredNode (QObject *parent = nullptr);
QString nodeId () const;
void setNodeId (const QString &id);
bool monitored () const;
void setMonitored (bool monitored);
QVariant value () const;
bool writable () const;
OpcUaNodeInfo info () const;
/**
* @brief Write a value to the OPC UA node.
*
* Coerces @a value to the node's data type (auto-detected from the
* server's DataType attribute). For array nodes, a comma-separated
* string is split and each element coerced individually.
* Result is reported asynchronously via writeCompleted().
*/
Q_INVOKABLE void writeValue (const QVariant &value);
void classBegin () override;
void componentComplete () override;
signals:
void nodeIdChanged ();
void monitoredChanged ();
void valueChanged ();
void writableChanged ();
void infoChanged ();
void writeCompleted (bool success, const QString &message);
private slots:
void handleAttributeUpdated (QOpcUa::NodeAttribute attr,
const QVariant &value);
void handleValueUpdated (const QVariant &value);
void handleClientConnectedChanged ();
void handleAttributeWritten (QOpcUa::NodeAttribute attr,
QOpcUa::UaStatusCode statusCode);
private:
void setupNode ();
void teardownNode ();
QVariant coerceValue (const QVariant &input) const;
QString m_nodeId;
bool m_monitored = true;
bool m_componentComplete = false;
QOpcUaNode *m_node = nullptr;
QOpcUa::Types m_valueType = QOpcUa::Types::Undefined;
bool m_writable = false;
QVariant m_value;
OpcUaNodeInfo m_info;
};
#endif // OPCUAMONITOREDNODE_H
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