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From "Gary Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-34140) Add oldValue property to Collection event( CollectionEventKind.REFRESH/CollectionEventKind.RESET )
Date Thu, 13 Mar 2014 16:49:45 GMT

    [ https://issues.apache.org/jira/browse/FLEX-34140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13933516#comment-13933516
] 

Gary Yang commented on FLEX-34140:
----------------------------------

yes, undo function.

I think a list of copy with Array.concat([]) will be good enough, if you worry about performance,
let's add a switch and make default value false;

> Add oldValue property to Collection event( CollectionEventKind.REFRESH/CollectionEventKind.RESET
)
> --------------------------------------------------------------------------------------------------
>
>                 Key: FLEX-34140
>                 URL: https://issues.apache.org/jira/browse/FLEX-34140
>             Project: Apache Flex
>          Issue Type: Task
>          Components: Collections
>            Reporter: Gary Yang
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> For a CollectionEvent, when event kind is 
> CollectionEventKind.Add REPLACE REMOVE MOVE UPDATE
> it is revertable, because for ADD/REMOVE, developers can call REMOVE/ADD, for MOVE, there's
a oldLocation; for REPLACE: the items are PropertyChangeEvent which has oldValue.
> but for CollectionEventKind.REFRESH and RESET, it is NOT revertable!!!
> If Flex can add a new oldValue or oldList, ( or depreciated: give developers a event
right before dispatching ), Flex will be better!!!



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