Implement OpcUaMonitoredNode attribute reading with OpcUaNodeInfo gadget

1 files changed, 55 insertions, 0 deletions

diff --git a/src/OpcUaMonitoredNode.h b/src/OpcUaMonitoredNode.h
index 9d093b5..53e9537 100644
--- a/src/OpcUaMonitoredNode.h
+++ b/src/OpcUaMonitoredNode.h
@@ -8,9 +8,44 @@
 #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 (quint32 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;
+  quint32 accessLevel = 0;
+  QString status;
+  QDateTime sourceTimestamp;
+  QDateTime serverTimestamp;
+};
+Q_DECLARE_METATYPE (OpcUaNodeInfo)
 
 class OpcUaMonitoredNode : public QObject, public QQmlParserStatus
 {
@@ -21,6 +56,8 @@ class OpcUaMonitoredNode : public QObject, public QQmlParserStatus
   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 (OpcUaNodeInfo info READ info NOTIFY infoChanged)
 
 public:
   explicit OpcUaMonitoredNode (QObject *parent = nullptr);
@@ -31,17 +68,35 @@ public:
   bool monitored () const;
   void setMonitored (bool monitored);
 
+  QVariant value () const;
+  OpcUaNodeInfo info () const;
+
   void classBegin () override;
   void componentComplete () override;
 
 signals:
   void nodeIdChanged ();
   void monitoredChanged ();
+  void valueChanged ();
+  void infoChanged ();
+
+private slots:
+  void handleAttributeUpdated (QOpcUa::NodeAttribute attr,
+                               const QVariant &value);
+  void handleValueUpdated (const QVariant &value);
+  void handleClientConnectedChanged ();
 
 private:
+  void setupNode ();
+  void teardownNode ();
+
   QString m_nodeId;
   bool m_monitored = true;
   bool m_componentComplete = false;
+
+  QOpcUaNode *m_node = nullptr;
+  QVariant m_value;
+  OpcUaNodeInfo m_info;
 };
 
 #endif // OPCUAMONITOREDNODE_H