public void Dispose()
{
foreach (var modelBase in models)
{
if (!(modelBase is NodeModel)) // Only nodes have connectors.
{
continue;
}
var nodeModel = modelBase as NodeModel;
foreach (var connectorModel in nodeModel.AllConnectors)
{
// Connectors after node is modified.
remainingConnectors[connectorModel.GUID] = connectorModel;
}
}
var removed = new List <XmlElement>();
var added = new List <ConnectorModel>();
if (!ComputeDifference(removed, added))
{
return; // No difference in connectors.
}
// If there are differences in connector count, some connectors must
// have been dropped or created. In this case the originally recorded
// entry on the undo stack must be discarded, and recreated in the
// same action group as these connectors.
//
var previousGroup = recorder.PopFromUndoGroup();
// Create a new action group to record changes
// affecting the node and its connectors.
using (recorder.BeginActionGroup())
{
// For each of the deleted connectors, record its respective
// XmlElement that was serialized before they were deleted.
var deletionString = UserAction.Deletion.ToString();
foreach (var connector in removed)
{
recorder.SetNodeAction(connector, deletionString);
recorder.currentActionGroup.AppendChild(connector);
}
foreach (XmlNode childNode in previousGroup.ChildNodes)
{
// Record the model modification itself.
recorder.currentActionGroup.AppendChild(childNode);
}
foreach (var connector in added)
{
recorder.RecordCreationForUndo(connector);
}
// When a new action group is recorded for undo,
// the redo stack should always be cleared.
if (recorder.redoStack.Count > 0)
{
throw new InvalidOperationException(
"Redo stack should be empty after recording!");
}
}
}
