Prevent GvNode from being deleted
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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