generic drop target possible ?

Hello all,

I am hoping to write a "generic" drop target meaning that it
accepts drops of "anything" and decides what to do with it
based upon the type received. Is that possible with
wxPython4 ?

I am trying like this:

class cGenericDropTarget(wx.DropTarget):
	def __init__(self, *args, **kwargs):
		super().__init__(*args, **kwargs)
		data_object = wx.DataObjectComposite()
		data_object.Add(wx.FileDataObject(), True)
		data_object.Add(wx.TextDataObject())
		# not accepted by Add():
		#data_object.Add(wx.URLDataObject())
		data_object.Add(wx.BitmapDataObject())
		self.SetDataObject(data_object)

	def OnDrop(self, x, y):
		print('received a drop request at', x, y, 'accepting')
		return True		# receive any drop

	def OnData(self, x, y, suggested_drag_result):
		print('receiving dropped data at', x, y)
		print('suggested drag result:', suggested_drag_result)
		# copy data from drop source to our data object
		copied = self.GetData()
		print('copied data from source into our data object:', copied)
		print('our composite object:', self.DataObject)
		received_format = self.DataObject.GetReceivedFormat()
		print('received format obj:', received_format)
		format_int = received_format.GetType()
		try:
			format_str = received_format.Id
		except Exception:
			_log.exception('wx.DataFormat.Id not supported')
			format_str = None
		print('format as int:', format_int)
		print('format as str:', format_str)
		filled_in_data_object = self.DataObject.GetObject(received_format)
		print('filled in object:', filled_in_data_object)
		print('data size:', filled_in_data_object.GetDataSize())
		if format_int == wx.DF_FILENAME:
			print('files:', filled_in_data_object.Filenames)
		elif format_int == wx.DF_UNICODETEXT:
			print('text:', filled_in_data_object.Text)
		else:
			print('unknown type')
		# this segfaults:
		#data = filled_in_data_object.GetDataHere(format_int)
		#print('data:', data)
		return suggested_drag_result

This is, of course, not generic, but restricted to file
lists, text data, and bitmap data. At the very least I would
like to also accept URLs dragged in from a browser.

Should I add a wx.CustomDataObject() as sub object and that
will somehow magically receive any data not accepted by the
other data objects ?

Thanks,
Karsten
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