On 12/11/2016 at 19:19, xxxxxxxx wrote:
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);
On 14/11/2016 at 02:32, xxxxxxxx wrote:
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.