[Pharo-dev] a weak on:do:/when:do:

Stéphane Ducasse stephane.ducasse at inria.fr
Wed Aug 28 05:54:28 EDT 2013

whenListChanged: aBlock
	"Specify a block to value after the contents of the list has changed"

	"Basically when you set a new list of items"

	<api: #event>
	| block |
	block := [ :announcement :ann | 
		cull: announcement newContents
		cull: announcement oldContents
		cull: announcement
		cull: ann ].
	listAnnouncer weak
		when: ValueChanged
		do: block

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