Update Child After RemapObjectIds?

Rhino Developer
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1

I’m updating a child obj’s parent.

  const CRhinoHistoryRecord* record = object->HistoryRecord();
  if (nullptr == record)
    return 0;
  ON_HistoryRecord* copy = doc->m_history_record_table.GetPrunedHistoryRecord(record->RecordIndex());
  if (nullptr == copy)
    return 0;

  ON_SimpleArray<ON_UuidPair> remap(1);
  ON_UuidPair& pair = remap.AppendNew();
  pair.m_uuid[0] = oldParentId;
  pair.m_uuid[1] = newParentId;
  copy->RemapObjectIds(remap);

  CRhinoHistory history(copy); 

  CRhinoHistoryManager* manager = RhinoHistoryManager();
  const bool bRecording = manager->HistoryRecordingEnabled();
  manager->EnableHistoryRecording(true);

  const bool rc = doc->m_history_record_table.CreateObjectHistory(
    const_cast<CRhinoObject*>(object), history);

  manager->EnableHistoryRecording(bRecording);

Afterward, how do I get history to replay with the new parent, as you would with _HistoryUpdate?

2

Hi @EricM,

You cannot update history as a command operation. That is, this is something you cannot trigger mid-command.

That said, you might be able to trigger an update in an idle event handler. In this case, this might work:

void HistoryUpdateDescendants(unsigned int docSerialNumber)
{
  CRhinoDoc* pDoc = CRhinoDoc::FromRuntimeSerialNumber(docSerialNumber);
  if (nullptr != pDoc && 0 == pDoc->InCommand(true))
  {
    CRhinoHistoryManager* pHistoryManager = RhinoHistoryManager(pDoc);
    if (pHistoryManager)
      pHistoryManager->UpdateDescendants(*pDoc);
  }
}

– Dale

3

Hmm…that’s not ideal. I was able to get it to update by treating it like a normal command. After the remap, I replaced the parent in doc objects with no changes, which triggered a history replay on the child. However, that also broke history on the parent.

What if after I remap the parent, I copy the parent’s history record, replace the parent obj in the doc, and then push that history record back into the table?

4

Oh, what about UpdateDescendants()? If you can’t update within a command, where is this meant to be run from?

5

Hi @EricM,

From rhinoSdkObjectHistory.h:

// Expert user tools 
//  - no support available 
//  - can change without notice
CRhinoCommand::result UpdateDescendants(class CRhinoDoc& doc);

I’ve already mentioned how you might use this.

Rhino’s command manager calls this after executing your command.

– Dale