displaylist.setchangecallback

call a function when the list changes

Synopsis
setchangecallback(callback)

Description
This sets a callback function to be called when the list is first changed, at which point the callback is unset. The idea is that the user somehow ``saves'' the drawlist, at which point he wants to be notified when the list has changed. When he has saved it again, he resets the callback.

Arguments

callback		function to call on item
		Allowed:	function

Returns
T or fail

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	Package	display
	Module	guiutils
	Tool	displaylist

displaylist.setchangecallback - Function