[jira] [Commented] (FLEX-33169) Spark List selection on mobile doesn't work properly

["Maurice Amsellem (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLEX-33169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557088#comment-13557088 ] 

Maurice Amsellem commented on FLEX-33169:
-----------------------------------------

After spending some hours debugging live on the ipad, I finally manage to identify what I think is the cause of this bug. 

It's in List.removeMouseHandlersForDragStart

        var selectionChange:Boolean = (event.target == mouseDownObject || 
                    (mouseDownObject is DisplayObjectContainer && 
                        DisplayObjectContainer(mouseDownObject).contains(event.target as DisplayObject)));

The test above is not correct.

Steps to reproduce:
Suppose that your item custom renderer displays two StyleableTextField side by side.
* Press your finger exactly at the junction of the two items, slightly to the left, so that mouseDownObject will be the left item.
* now move your finger a few pixels to the right (that's easier on retina devices) then release it, so that event.target is on the right item.
* that's it:  mouseDownObject is different from event.target, and it does not include it either (they are both contained by the itemRenderer).

The test should be that both items are included in the same item renderer, or something similar.  Not sure how to fix this.

                
> Spark List selection on mobile doesn't work properly
> ----------------------------------------------------
>
>                 Key: FLEX-33169
>                 URL: https://issues.apache.org/jira/browse/FLEX-33169
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: List
>    Affects Versions: Adobe Flex SDK 4.5.1 (Release), Adobe Flex SDK 4.6 (Release)
>         Environment: iOS 5.x, Android 3.2/4.0, Air 3.0 - 3.3
>            Reporter: Al Birdy
>
> The touch selection of list items on the actual device does not work properly.
> Sometimes, even though the touch has definitely been recognized by the device, the list selection change isn't committed, instead the previously selected item remains selected.
> To reproduce the issue, please set up a new Flex mobile project and add the most basic list with inline renderer to a view:
> <s:List id="myList" width="100%" height="100%">
>     <s:dataProvider>
>         <s:ArrayCollection>
>             <fx:Object label="Item1" />
>                          .....
>             <fx:Object label="Item30" />
>         </s:ArrayCollection>
>     </s:dataProvider>
> </s:List>
> Deploy the app to an actual device (this bug does NOT appear in the emulator!) and randomly try to select items, scroll the list, select again and so on. You'll notice that the down color is sometimes set, but the selection isn't changed.
> For a more detailed description of this bug please see http://stackoverflow.com/questions/11740074/selection-on-spark-mobile-list-only-works-3-out-of-4-times

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