/// <summary>
/// Sets the root node for the control.
/// 设置控件的根节点。
/// </summary>
public void SetRoot(Browser browser, NodeId rootId)
{
Clear();
ShowReferencesMI.Checked = m_showReferences;
m_rootId = rootId;
m_browser = browser;
if (m_browser != null)
{
m_browser.MoreReferences += m_BrowserMoreReferences;
}
// check if session is connected.
if (m_browser == null || !m_browser.Session.Connected)
{
return;
}
if (NodeId.IsNull(rootId))
{
m_rootId = Objects.RootFolder;
}
if (m_browser != null)
{
INode node = m_browser.Session.NodeCache.Find(m_rootId);
if (node == null)
{
return;
}
//引用描述
ReferenceDescription reference = new ReferenceDescription();
reference.ReferenceTypeId = ReferenceTypeIds.References;
reference.IsForward = true;
reference.NodeId = node.NodeId;
reference.NodeClass = (NodeClass)node.NodeClass;
reference.BrowseName = node.BrowseName;
reference.DisplayName = node.DisplayName;
reference.TypeDefinition = null;
string text = GetTargetText(reference);
string icon = GuiUtils2.GetTargetIcon(m_browser.Session, reference);
TreeNode root = AddNode(null, reference, text, icon);
root.Nodes.Add(new TreeNode());
root.Expand();
}
}
/// <summary>
/// Displays the target of a browse operation in the control.
/// </summary>
private void Browse(NodeId startId)
{
if (m_browser == null || NodeId.IsNull(startId))
{
Clear();
return;
}
List <ItemData> variables = new List <ItemData>();
// browse the references from the node and build list of variables.
BeginUpdate();
foreach (ReferenceDescription reference in m_browser.Browse(startId))
{
Node target = m_session.NodeCache.Find(reference.NodeId) as Node;
if (target == null)
{
continue;
}
ReferenceTypeNode referenceType = m_session.NodeCache.Find(reference.ReferenceTypeId) as ReferenceTypeNode;
Node typeDefinition = null;
if ((target.NodeClass & (NodeClass.Variable | NodeClass.Object)) != 0)
{
typeDefinition = m_session.NodeCache.Find(reference.TypeDefinition) as Node;
}
else
{
typeDefinition = m_session.NodeCache.Find(m_session.NodeCache.TypeTree.FindSuperType(target.NodeId)) as Node;
}
ItemData item = new ItemData(referenceType, !reference.IsForward, target, typeDefinition);
AddItem(item, GuiUtils2.GetTargetIcon(m_browser.Session, reference), -1);
if ((target.NodeClass & (NodeClass.Variable | NodeClass.VariableType)) != 0)
{
variables.Add(item);
}
}
EndUpdate();
// read the current value for any variables.
if (variables.Count > 0)
{
ReadValueIdCollection nodesToRead = new ReadValueIdCollection();
foreach (ItemData item in variables)
{
ReadValueId valueId = new ReadValueId();
valueId.NodeId = item.Target.NodeId;
valueId.AttributeId = Attributes.Value;
valueId.IndexRange = null;
valueId.DataEncoding = null;
nodesToRead.Add(valueId);
}
DataValueCollection values;
DiagnosticInfoCollection diagnosticInfos;
m_session.Read(
null,
0,
TimestampsToReturn.Neither,
nodesToRead,
out values,
out diagnosticInfos);
ClientBase.ValidateResponse(values, nodesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, nodesToRead);
for (int ii = 0; ii < variables.Count; ii++)
{
variables[ii].Value = values[ii];
foreach (ListViewItem item in ItemsLV.Items)
{
if (Object.ReferenceEquals(item.Tag, variables[ii]))
{
UpdateItem(item, variables[ii]);
break;
}
}
}
}
AdjustColumns();
}
/// <summary>
/// Adds a target to the tree control.
/// </summary>
private void AddReferences(TreeNode parent, ReferenceDescriptionCollection references)
{
foreach (ReferenceDescription reference in references)
{
if (reference.ReferenceTypeId.IsNullNodeId)
{
Utils.Trace("Reference {0} has null reference type id", reference.DisplayName);
continue;
}
ReferenceTypeNode typeNode = m_browser.Session.NodeCache.Find(reference.ReferenceTypeId) as ReferenceTypeNode;
if (typeNode == null)
{
Utils.Trace("Reference {0} has invalid reference type id.", reference.DisplayName);
continue;
}
if (m_browser.BrowseDirection == BrowseDirection.Forward && !reference.IsForward ||
m_browser.BrowseDirection == BrowseDirection.Inverse && reference.IsForward)
{
Utils.Trace("Reference's IsForward value is: {0}, but the browse direction is: {1}; for reference {2}", reference.IsForward, m_browser.BrowseDirection, reference.DisplayName);
continue;
}
if (reference.NodeId == null || reference.NodeId.IsNull)
{
Utils.Trace("The node id of the reference {0} is NULL.", reference.DisplayName);
continue;
}
if (reference.BrowseName == null || reference.BrowseName.Name == null)
{
Utils.Trace("Browse name is empty for reference {0}", reference.DisplayName);
continue;
}
if (!Enum.IsDefined(typeof(Opc.Ua.NodeClass), reference.NodeClass) || reference.NodeClass == NodeClass.Unspecified)
{
Utils.Trace("Node class is an unknown or unspecified value, for reference {0}", reference.DisplayName);
continue;
}
if (m_browser.NodeClassMask != 0 && m_browser.NodeClassMask != 255)
{
if (reference.TypeDefinition == null || reference.TypeDefinition.IsNull)
{
Utils.Trace("Type definition is null for reference {0}", reference.DisplayName);
continue;
}
}
// suppress duplicate references.
if (!m_showReferences)
{
bool exists = false;
foreach (TreeNode existingChild in parent.Nodes)
{
ReferenceDescription existingReference = existingChild.Tag as ReferenceDescription;
if (existingReference != null)
{
if (existingReference.NodeId == reference.NodeId)
{
exists = true;
break;
}
}
}
if (exists)
{
continue;
}
}
string text = GetTargetText(reference);
string icon = GuiUtils2.GetTargetIcon(m_browser.Session, reference);
TreeNode container = parent;
if (m_showReferences)
{
container = FindReferenceTypeContainer(parent, reference);
}
if (container != null)
{
TreeNode child = AddNode(container, reference, text, icon);
child.Nodes.Add(new TreeNode());
}
}
}