internal void RecordAndDeleteModels(List <ModelBase> models)
{
if (!ShouldProceedWithRecording(models))
{
return; // There's nothing for deletion.
}
// Gather a list of connectors first before the nodes they connect
// to are deleted. We will have to delete the connectors first
// before
this.undoRecorder.BeginActionGroup(); // Start a new action group.
foreach (ModelBase model in models)
{
if (model is NoteModel)
{
// Take a snapshot of the note before it goes away.
this.undoRecorder.RecordDeletionForUndo(model);
this.Notes.Remove(model as NoteModel);
}
else if (model is NodeModel)
{
// Just to make sure we don't end up deleting nodes from
// another workspace (potentially two issues: the node was
// having its "Workspace" pointing to another workspace,
// or the selection set was not quite set up properly.
//
NodeModel node = model as NodeModel;
System.Diagnostics.Debug.Assert(this == node.WorkSpace);
foreach (var conn in node.AllConnectors().ToList())
{
conn.NotifyConnectedPortsOfDeletion();
this.Connectors.Remove(conn);
this.undoRecorder.RecordDeletionForUndo(conn);
}
// Take a snapshot of the node before it goes away.
this.undoRecorder.RecordDeletionForUndo(model);
node.DisableReporting();
node.Destroy();
node.Cleanup();
node.WorkSpace.Nodes.Remove(node);
}
else if (model is ConnectorModel)
{
ConnectorModel connector = model as ConnectorModel;
this.Connectors.Remove(connector);
this.undoRecorder.RecordDeletionForUndo(model);
}
}
this.undoRecorder.EndActionGroup(); // Conclude the deletion.
}