/// <summary>
/// Displays the available areas in a tree view.
/// </summary>
/// <param name="session">The session.</param>
/// <returns></returns>
public FilterDefinition ShowDialog(Session session, FilterDefinition filter)
{
m_session = session;
m_filter = filter;
TreeNode root = new TreeNode(Opc.Ua.BrowseNames.BaseEventType);
root.Nodes.Add(new TreeNode());
BrowseTV.Nodes.Add(root);
root.Expand();
// display the dialog.
if (ShowDialog() != DialogResult.OK)
{
return null;
}
// ensure selection is valid.
if (BrowseTV.SelectedNode == null)
{
return null;
}
// update selected fields.
for (int ii = 0; ii < EventFieldsLV.Items.Count; ii++)
{
FilterDefinitionField field = EventFieldsLV.Items[ii].Tag as FilterDefinitionField;
if (field != null)
{
field.ShowColumn = EventFieldsLV.Items[ii].Checked;
}
}
// return the result.
return m_newFilter;
}
/// <summary>
/// Handles the AfterSelect event of the BrowseTV control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Forms.TreeViewEventArgs"/> instance containing the event data.</param>
private void BrowseTV_AfterSelect(object sender, TreeViewEventArgs e)
{
try
{
EventFieldsLV.Items.Clear();
FilterDefinition filter = m_newFilter = new FilterDefinition();
filter.EventTypeId = null;
filter.Fields = new List<FilterDefinitionField>();
if (e.Node == null)
{
OkBTN.Enabled = false;
return;
}
OkBTN.Enabled = true;
// get the currently selected event.
NodeId eventTypeId = Opc.Ua.ObjectTypeIds.BaseEventType;
ReferenceDescription reference = e.Node.Tag as ReferenceDescription;
if (reference != null)
{
eventTypeId = (NodeId)reference.NodeId;
}
filter.EventTypeId = eventTypeId;
// collect all of the fields defined for the event.
SimpleAttributeOperandCollection fields = new SimpleAttributeOperandCollection();
List<NodeId> declarationIds = new List<NodeId>();
FormUtils.CollectFieldsForType(m_session, eventTypeId, fields, declarationIds);
// need to read the description and datatype for each field.
ReadValueIdCollection valuesToRead = new ReadValueIdCollection();
for (int ii = 0; ii < declarationIds.Count; ii++)
{
ReadValueId valueToRead = new ReadValueId();
valueToRead.NodeId = declarationIds[ii];
valueToRead.AttributeId = Attributes.Description;
valuesToRead.Add(valueToRead);
valueToRead = new ReadValueId();
valueToRead.NodeId = declarationIds[ii];
valueToRead.AttributeId = Attributes.DataType;
valuesToRead.Add(valueToRead);
valueToRead = new ReadValueId();
valueToRead.NodeId = declarationIds[ii];
valueToRead.AttributeId = Attributes.ValueRank;
valuesToRead.Add(valueToRead);
}
DataValueCollection results = null;
DiagnosticInfoCollection diagnosticInfos = null;
m_session.Read(
null,
0,
TimestampsToReturn.Neither,
valuesToRead,
out results,
out diagnosticInfos);
ClientBase.ValidateResponse(results, valuesToRead);
ClientBase.ValidateDiagnosticInfos(diagnosticInfos, valuesToRead);
// collect values. ignore errors since data used for display only.
List<LocalizedText> descriptions = new List<LocalizedText>();
List<NodeId> datatypes = new List<NodeId>();
List<int> valueRanks = new List<int>();
for (int ii = 0; ii < declarationIds.Count*3; ii += 3)
{
descriptions.Add(results[ii].GetValue<LocalizedText>(LocalizedText.Null));
datatypes.Add(results[ii+1].GetValue<NodeId>(NodeId.Null));
valueRanks.Add(results[ii+2].GetValue<int>(ValueRanks.Any));
}
// populate the list box.
for (int ii = 0; ii < fields.Count; ii++)
{
FilterDefinitionField field = new FilterDefinitionField();
filter.Fields.Add(field);
field.Operand = fields[ii];
StringBuilder displayName = new StringBuilder();
for (int jj = 0; jj < field.Operand.BrowsePath.Count; jj++)
{
if (displayName.Length > 0)
{
displayName.Append('/');
}
displayName.Append(field.Operand.BrowsePath[jj].Name);
}
field.DisplayName = displayName.ToString();
field.DataType = datatypes[ii];
field.ValueRank = valueRanks[ii];
field.BuiltInType = DataTypes.GetBuiltInType(field.DataType, m_session.TypeTree);
field.Description = descriptions[ii].ToString();
// preserve previous settings.
for (int jj = 0; jj < m_filter.Fields.Count; jj++)
{
if (m_filter.Fields[jj].DisplayName == field.DisplayName)
{
field.ShowColumn = m_filter.Fields[jj].ShowColumn;
field.FilterValue = m_filter.Fields[jj].FilterValue;
break;
}
}
ListViewItem item = new ListViewItem(field.DisplayName);
item.SubItems.Add(String.Empty);
item.SubItems.Add(String.Empty);
item.Checked = field.ShowColumn;
item.Tag = field;
INode dataType = m_session.NodeCache.Find(datatypes[ii]);
if (dataType != null)
{
displayName = new StringBuilder();
displayName.Append(dataType.ToString());
if (valueRanks[ii] >= 0)
{
displayName.Append("[]");
}
field.DataTypeDisplayName = displayName.ToString();
item.SubItems[1].Text = field.DataTypeDisplayName;
}
item.SubItems[2].Text = descriptions[ii].ToString();
EventFieldsLV.Items.Add(item);
}
// resize columns to fit text.
for (int ii = 0; ii < EventFieldsLV.Columns.Count; ii++)
{
EventFieldsLV.Columns[ii].Width = -2;
}
}
catch (Exception exception)
{
MessageBox.Show(exception.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}