Prevent GvNode from being deleted



  • On 12/11/2016 at 19:19, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   18 
    Platform:    Mac  ;  Mac OSX  ; 
    Language(s) :     C++  ;

    ---------
    Is there any way to prevent a GvNode from being deleted in the UI (i.e.: the user right clicks on the node and chooses Delete).

    One of these nodes in our graph is what we consider the "root" node, so this shouldn't be deleted. I tried calling BaseDocument::DoUndo whenever we receive a GV_MESSAGE_NODE_REMOVED message, but I'm getting a crash somewhere in c4d_gui.cpp:

    frame #8: 0x000000012b9914ca RenderMan_for_C4D.dylib`CDialogCallBack(cd=0x000000012cb5b2c0, cu=0x0000000105664340, msg=0x00007fff5fbfe810) + 138 at c4d_gui.cpp:74
       71  			GeUserArea* usr = (GeUserArea* )C4DOS.Cu->GetUserData(cu);
       72  			if (!usr)
       73  				return false;
    -> 74  			res = usr->Message(*msg, result);
       75  		}
       76  		else
       77  		{
    

    Thanks,
    Ian



  • On 14/11/2016 at 02:32, xxxxxxxx wrote:

    Hello,

    as far as I can see there is no way to prevent that a certain XPRESSO node can be deleted.

    I guess you are catching the GV_MESSAGE_NODE_REMOVED in an XPRESSO node? You cannot call DoUndo() there because when the message is sent the node is not yet deleted and the undo-step not yet created.

    The only node that cannot be removed is the root node of a given GvNodeMaster. So if you want to define some "root" ports you can add some in-ports to the root node.

    best wishes,
    Sebastian


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