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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt OPC UA module.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "opcuavaluenode.h"
#include "opcuaconnection.h"
#include "opcuanodeid.h"
#include <QLoggingCategory>
QT_BEGIN_NAMESPACE
/*!
\qmltype ValueNode
\inqmlmodule QtOpcUa
\brief Represents a value node from a server.
\inherits Node
\since QtOpcUa 5.12
\code
import QtOpcUa 5.12 as QtOpcUa
QtOpcUa.ValueNode {
nodeId: QtOpcUa.NodeId {
ns: "Test Namespace"
identifier: "s=TestName"
}
connection: myConnection
}
\endcode
A subscription will be created on the server in order to track value changes on the server.
\sa NodeId, Connection, Node
*/
/*!
\qmlproperty variant ValueNode::value
Value of this node.
Reading and writing this property will access the node on the server.
*/
Q_DECLARE_LOGGING_CATEGORY(QT_OPCUA_PLUGINS_QML)
OpcUaValueNode::OpcUaValueNode(QObject *parent):
OpcUaNode(parent)
{
}
OpcUaValueNode::~OpcUaValueNode()
{
}
void OpcUaValueNode::setValue(const QVariant &value)
{
m_node->writeAttribute(QOpcUa::NodeAttribute::Value, value, QOpcUa::Types::Undefined);
}
void OpcUaValueNode::setupNode(const QString &absolutePath)
{
OpcUaNode::setupNode(absolutePath);
if (!m_node)
return;
connect(m_node, &QOpcUaNode::attributeRead, this, &OpcUaValueNode::handleAttributeUpdate);
connect(m_node, &QOpcUaNode::dataChangeOccurred, this, &OpcUaValueNode::handleDataChangeOccurred);
if (!m_node->readAttributes(QOpcUa::NodeAttribute::Value
| QOpcUa::NodeAttribute::NodeClass
| QOpcUa::NodeAttribute::Description
| QOpcUa::NodeAttribute::DataType
| QOpcUa::NodeAttribute::BrowseName
| QOpcUa::NodeAttribute::DisplayName
))
qCWarning(QT_OPCUA_PLUGINS_QML) << "Reading attributes" << m_node->nodeId() << "failed";
if (!m_node->enableMonitoring(QOpcUa::NodeAttribute::Value, QOpcUaMonitoringParameters(100)))
qCWarning(QT_OPCUA_PLUGINS_QML) << "Failed monitoring" << m_node->nodeId();
}
void OpcUaValueNode::handleAttributeUpdate(QOpcUa::NodeAttributes attrs)
{
/*
if (attr & QOpcUa::NodeAttribute::NodeClass)
mNodeClass = mOpcNode->attribute(QOpcUa::NodeAttribute::NodeClass).value<QOpcUa::NodeClass>();
if (attr & QOpcUa::NodeAttribute::BrowseName)
mNodeBrowseName = mOpcNode->attribute(QOpcUa::NodeAttribute::BrowseName).value<QOpcUa::QQualifiedName>().name();
if (attr & QOpcUa::NodeAttribute::DisplayName)
mNodeDisplayName = mOpcNode->attribute(QOpcUa::NodeAttribute::DisplayName).value<QOpcUa::QLocalizedText>().text();
if (attr & QOpcUa::NodeAttribute::NodeId)
mNodeDisplayName = mOpcNode->attribute(QOpcUa::NodeAttribute::NodeId).toString();
*/
if (attrs & QOpcUa::NodeAttribute::Value) {
const auto value = m_node->attribute(QOpcUa::NodeAttribute::Value);
if (value != m_cachedValue) {
m_cachedValue = value;
emit valueChanged(value);
}
}
setReadyToUse();
}
void OpcUaValueNode::handleDataChangeOccurred(QOpcUa::NodeAttribute attr, QVariant value)
{
if (attr == QOpcUa::NodeAttribute::Value) {
if (value != m_cachedValue) {
m_cachedValue = value;
emit valueChanged(value);
}
}
}
QVariant OpcUaValueNode::value() const
{
if (!m_node)
return QVariant();
return m_node->attribute(QOpcUa::NodeAttribute::Value);
}
QT_END_NAMESPACE
|
