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

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 | aBlock cull: announcement newContents cull: announcement oldContents cull: announcement cull: ann ]. listAnnouncer weak when: ValueChanged do: block