Detect undo in ToolData.Message

Helper

On 27/12/2015 at 00:21, xxxxxxxx wrote:

Hi again,

I'd like to detect in my tool plugin when the user has pressed the Undo button (Ctrl+Z).
Looking at the python sdk I see there is a message of type MSG_DESCRIPTION_INITUNDO, but apparently this is not the message which is sent when an undo is performed.
When printing out the message type sent to ToolData.Message() I see that following values are printed to the console when undo is pressed:
7
200000096
14
1001078

Where can I find out what these values mean? Are there some include files which list which MSG represents what value?

The 200000096 seems to be related to the action I performed before the undo, while the 1001078 seems to be related to the current document. So I went with value 14 to detect the undo action, and that seems to be fine (for testing purposes). Still, I'd like to detect the proper undo message.

Thanks

Helper

On 27/12/2015 at 11:23, xxxxxxxx wrote:

Write a SceneHook and check for MSG_DOCUMENTINFO_TYPE_UNDO.

See this post also: https://developers.maxon.net/forum/topic/8134/10595_detect-if-undo-was-pressed-solved

But I am not 100% sure if this is possible in Python. Hope it helps though.

Helper

On 28/12/2015 at 02:37, xxxxxxxx wrote:

Hi,

You can filter MSG_DOCUMENTINFO (the message type 1001078 you mention) and its more specific MSG_DOCUMENTINFO_TYPE_UNDO.
This message is sent to the tool plugins and here's how to use it:

  def Message(self, doc, data, type, t_data) :
      if type==c4d.MSG_DOCUMENTINFO:
          info = t_data
          if info['type']==c4d.MSG_DOCUMENTINFO_TYPE_UNDO:
              print "Undo Performed"
      return True

Avoid as much as possible using hard coded values. Moreover if you don't know what they really mean or refer.

Helper

On 28/12/2015 at 07:13, xxxxxxxx wrote:

Thanks Yannick.

Got it working.