イベントとは

# 
# Drag and drop events are intentionally disabled by default for performance, so the
# drag portion of the event gives you the opportunity to enable drop detection while 
# the drop portion is where you can perform the desired action on the item.
#
import win32com.client
from win32com.client import constants as c	# to use Softimage enums and constants
import re					# for regular expressions

# Registration 
def XSILoadPlugin( in_reg ):
	in_reg.Author = "SDK Doc"
	in_reg.Name = "ImportBooFile Plug-in"
	in_reg.RegisterCommand("ImportBoo","ImportBoo")
	in_reg.RegisterEvent("siOnDragAndDropEvent",c.siOnDragAndDrop)
	return 1

# Set up custom importer command
def ImportBoo_Init( in_ctxt ):
	oCmd = in_ctxt.Source
	oCmd.ReturnValue = 1
	oArgs = oCmd.Arguments
	oArgs.Add("in_filename",c.siArgumentInput)
	return 1

# Implementation of the importer
def ImportBoo_Execute( in_filename ):
	Application.LogMessage( "Importing " + in_filename )
	#
	# This is where you either implement the importer or call the implementation
	#
	return 1

# Callback for the siOnDragAndDropEvent event. The important thing to remember is that
# the drag and drop event is a two-stage action: dragging and dropping. When the item 
# is being dragged, you can check to see whether it is something you want to pay 
# attention to after it's dropped (ie., if it's the right kind of file). If it is, you
# enable the DragSourceSupported attribute so that when the file is actually dropped,
# the siSourceDropAction is fired and you can call the importer.
def siOnDragAndDropEvent_OnEvent( in_ctxt ):
	action = in_ctxt.GetAttribute("DragAndDropAction")
	file = in_ctxt.GetAttribute("DragSource")
	
	if ( action == c.siSourceDragAction ) :
		# When the file is dragged, check to see if it's got the right extension 
		pattrn = re.compile( "\.boo$", re.I ) # equivalent to JScript's /\.boo$/i
		if ( pattrn.search(file) ) :
			# Enable the drop action via the DragSourceSupported
			# context attribute if it's got the right extension
			in_ctxt.SetAttribute( "DragSourceSupported", 1 )
		else :
			# Otherwise disable the drop action 
			in_ctxt.SetAttribute( "DragSourceSupported", 0 )
	else : # action == c.siSourceDropAction
		# When file is , dropped, run your custom importer command
		ImportBoo_Execute( file )
	
     return 1

# Output:
# INFO : Importing <user_location>\Application\Plugins\test.boo