detect if undo was pressed [SOLVED]

On 14/09/2014 at 03:50, xxxxxxxx wrote:

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

---------
Hi,

quick question:

in a c++ plugin, is it possible to detect if the user has pressed the undo button ?

i tried like this, but it does not detect undo's :

Bool WinGen::Message(GeListNode *node, LONG type, void *t_data){
.
.
	switch(type)
	{			
		case MSG_DOCUMENTINFO:	
			info = (DocumentInfoData* )t_data;
			if(info!=NULL && info->type == MSG_DOCUMENTINFO_TYPE_UNDO){
				GePrint("undo!");
			}
			break;
  
	}
  

is it possible at all to detect undo's ?

thanks,
  Daniel

On 14/09/2014 at 06:12, xxxxxxxx wrote:

Howdy,

It seems to work in a SceneHookData plugin, but not in a ToolData or TagData plugin. With what kind of plugin did you try to use it?

Adios,
Cactus Dan

On 14/09/2014 at 07:33, xxxxxxxx wrote:

Hello Dan, thanks for the info.

I tried it in an Object Generator Plugin and it did not work.
I guess i could write a scenehook plugin that 'listens' for undo actions and then notify my generator.. but i'd actually prefer a simpler solution with less effort, especially since i have no experience with scene hooks ;-)

On 14/09/2014 at 08:40, xxxxxxxx wrote:

Nothing difficult about them. You just have to keep in mind that they run above the document level, near to C4D level, therefore your SceneHook should do its thing (if there is anything to be done) and get out fast.  Here a basic example of a SceneHook:

MySceneHook.h

#pragma once
////////////////////////////////////////////////////////////////
// MySceneHook.h
////////////////////////////////////////////////////////////////
  
// CLASS: MySceneHook
class MySceneHook : public SceneHookData
{
	INSTANCEOF(MySceneHook, SceneHookData)
  
	public:
		// General
		MySceneHook();
		~MySceneHook();
		// SceneHookData
		Bool	Message(GeListNode* node, LONG type, void* data);
		// - Alloc
		static NodeData*		Alloc() { return gNew MySceneHook; }
};

MySceneHook.cpp

////////////////////////////////////////////////////////////////
// MySceneHook.cpp
////////////////////////////////////////////////////////////////
  
#include "c4d.h"
#include "MySceneHook.h"
  
// METHODS: MySceneHook ==================================================================================================
// Constructor
//*---------------------------------------------------------------------------*
MySceneHook::MySceneHook()
//*---------------------------------------------------------------------------*
{
}
// Destructor
//*---------------------------------------------------------------------------*
MySceneHook::~MySceneHook()
//*---------------------------------------------------------------------------*
{
}
// NodeData.Message
//*---------------------------------------------------------------------------*
Bool MySceneHook::Message(GeListNode* node, LONG type, void* data)
//*---------------------------------------------------------------------------*
{
	if (type != MSG_DOCUMENTINFO)
		return TRUE;
	DocumentInfoData*	pDocumentInfo =	static_cast<DocumentInfoData*>(data);
	if (!pDocumentInfo)
		return FALSE;
	if (pDocumentInfo->type == MSG_DOCUMENTINFO_TYPE_UNDO)
	{
		// Do whatever - as quickly as possible
	}
	return SUPER::Message(node,type,data);
}
  
// Global Registrant Method for MySceneHook plugin
//*---------------------------------------------------------------------------*
Bool RegisterMySceneHook()
//*---------------------------------------------------------------------------*
{
	return RegisterSceneHookPlugin(ID_MYSCENEHOOK, "SceneHook", PLUGINFLAG_HIDE|PLUGINFLAG_HIDEPLUGINMENU|PLUGINFLAG_SCENEHOOK_NOTDRAGGABLE, MySceneHook::Alloc, EXECUTIONPRIORITY_INITIAL, 0L, NULL);
}

On 14/09/2014 at 09:06, xxxxxxxx wrote:

cool man, thanks for the head start.
 I'll just go ahead then and try it out!

thanks for your help guys