Undo and BaseContainer

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  04 April 2006
Undo and BaseContainer

Hi everyone!

I have implemented a tag plugin which do some modifications on the points of an object thanks to sliders. Several sliders can be added by the user and their values are used for the modifications. Each time a slider is modified, the modification is made with a code like this one:

// Modifications on the points selected by the tag

Bc.SetContainer(3000, m_vector);
data.SetContainer(MYID, Bc);
doc->AddUndo(UNDO_CHANGE, tag);

where Bc is a BaseContainer in which my data (m_vector an other BaseContainer which contains several data) are stored.

When I add two sliders and change the sliders values and next do Undo in Cinema4d, the two sliders are removed when the Undo should affect only the laste modification on the points.

Does somebody have an explanation?

Thanks a lot.
  04 April 2006
you're setting your undo on the tag itself, not on the object and to the bit of code where you set the tags basecontainer not editing the object.

however i suspect that even if it was set just on the obejct the tag would also be involved as it's owned by the object.

regardless what you should do is something like this

 Vector *padr = object->GetPoints();
 LONG pcnt = object->GetPointCount();
 if (!padr || pcnt == 0) return;
 //do some modification to the object directly e.g.

also when you're dealing with objects basecontainers it's much better/faster to simply use the getdatainstance

 BaseContainer *bc = ((PluginTag*)tag)->GetDataInstace();
 if (!bc) return;
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  04 April 2006
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