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From "Maurice Amsellem (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-33607) AsyncListView does not seem to handle item removal notification properly
Date Mon, 15 Jul 2013 09:38:49 GMT

    [ https://issues.apache.org/jira/browse/FLEX-33607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708346#comment-13708346
] 

Maurice Amsellem commented on FLEX-33607:
-----------------------------------------

The real example requires asynchronous calls and a bunch of classes, so I wrote a simplified
example to focus on the pendingResponders "issue".

It involves two classes: AsyncListView and SimplePagedList class that fill the items in a
synchronous fashion and sends the appropriate events to the ALV. 
This class is inspired from Jame Ward's PagedList implementation.

The (realistic) scenario is the following:
- requests 5 items through the AsyncListView
- underlying SimplePagedList answers "actually there are only 1 item matching ", so sets its
length to 1, fills the items, and dispatches the appropriate REPLACE and  REMOVE events.

I am using AsyncListView.toString() to show the internal state of the list.

Running AsyncListViewTest class with FlexUnit 4, and it will fail with the following error:
"should have 0 pending items after answer - expected:<mx.collections::AsyncListView length=1,
0 pending requests> but was:<mx.collections::AsyncListView length=1, 4 pending requests>"

So what do you think? is that clear enough? or maybe I am not using AsyncListView the right
way? 
                
> AsyncListView does not seem to handle item removal notification properly
> ------------------------------------------------------------------------
>
>                 Key: FLEX-33607
>                 URL: https://issues.apache.org/jira/browse/FLEX-33607
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: ASyncListView
>    Affects Versions: Apache Flex 4.9.0
>            Reporter: Maurice Amsellem
>         Attachments: AsyncListViewTest.as, SimplePagedList.as
>
>
> When notifying an AsyncListView that items have been removed,  the itemResponders matching
the items to the right of the removal are shifted to the left, which is correct, but the itemResponders
for the removed items themselves are not removed.
> {code}
> mx.collections.AsyncListView.as
>   private function handleCollectionChangeEvent(ce:CollectionEvent):void
>     {
>    ...     
>         switch (ce.kind)
>         {
>          ...                               
>         case CollectionEventKind.REMOVE:
>                 shiftPendingRespondersLeft(ce);
>                 break;
> {code}
> One of the consequences is that if you truncate the client list (ie remove N items at
the end) and send a remove notification, the pending responders are not removed
>  

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