Drag and Drop composite data object problems on Catalina

Hi all,

I'm trying to get a project working on Catalina that I've had going with 
wxPython for a very long time.  I'm currently using python 3.7 and 
wxPython 4.1.0.

In part of my program, I can drag formatted text from a wx.RichTextCtrl 
and drop it on a wx.TreeCtrl node.  That same TreeCtrl can also receive 
information about media files, as well as meaningful drops of other 
wxTreeCtrl nodes.  It works on Windows 10.  (This code has also worked 
for a long time on python 2.7 and wxPthon 3.0.2.0 and earlier.)

But on Catalina, when I call my wx.CustomDataObject's DoDragDrop() 
method, I would get this message:

'QuoteDragDropData' is not a valid UTI string.  Cannot set data for an 
invalid UTI.

I eventually figured out that Catalina expects wx.DataFormat creation in 
a different way than what I am used to.  Instead of creating my 
CustomDataFormat drag/drop object with:

cdo = wx.CustomDataObject(wx.DataFormat("QuoteDragDropData"))

when creating my Quote data object, I instead have to say:

cdo = 
wx.CustomDataObject(wx.DataFormat("application.Transana.QuoteDragDropData")) 


(My application is named Transana.)

As so often happens, the act of creating a question for the list 
revealed the answer to that question.  It took me long enough to figure 
out that I thought I'd document this here in case others run into the 
same problem.

Also, would anyone be willing to explain to me the underlying reason for 
this difference?  I'd love to understand what I had to do a bit better.

Thanks,

David


-- 

David K. Woods, Ph.D.
President, Researcher, and Lead Transana Developer
https://www.transana.com
Pronouns:  he, him, his

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