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From "Alex Harui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-34188) RTE in ToolTipManagerImpl after focus set, grid cleared and then removed from stage.
Date Thu, 17 Apr 2014 16:42:21 GMT

    [ https://issues.apache.org/jira/browse/FLEX-34188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973135#comment-13973135

Alex Harui commented on FLEX-34188:

I was surprised to find that UIComponent does not set systemManager to null when removed from
the display list.  I think that is a bug that should be fixed some day although it would be
scary because lots of people might be depending on that behavior.

IMO, it would be better to have ToolTipManager check for a null systemManager and then not
create the tooltip.  Did you try that and find it had other side effects?

One potential issue of using a "nonNullSystemManager" for tooltips and other UI is that, in
an AIR app with multiple top-level windows, you might end up choosing the wrong systemManager.
 Each top-level window has its own systemManager.

> RTE in ToolTipManagerImpl after focus set, grid cleared and then removed from stage.
> ------------------------------------------------------------------------------------
>                 Key: FLEX-34188
>                 URL: https://issues.apache.org/jira/browse/FLEX-34188
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Focus Manager, Tooltip Manager
>    Affects Versions: Apache Flex 4.11.0
>            Reporter: Mihai Chira
>            Assignee: Alex Harui
>              Labels: easyfix, easytest
>             Fix For: Apache Flex 4.13.0
>         Attachments: FLEX-34188.patch, _ToolTipManager1009.fxp
> Steps to reproduce:
> 1. Run the attached AIR project
> 2. Move your mouse over one of the item renderers in the second row (and don't move it
for a bit)
> Current behaviour: the RTE below.
> Expected behaviour: a tooltip should appear next to the renderer.
> -this is most likely caused by FLEX-34187.
> -just like in FLEX-34187, we can reproduce this no matter to whom we give focus before
removing the grid.
> -in our application this is causing many similar runtime errors when transitioning from
complex views which contain DataGrids.
> -UIFTETextField (the default renderer) seems to be the only component left whose systemManager
value depends on whether it's on stage or not. If the effects range beyond interfering with
ToolTipManager, maybe we can make it implement a caching method similar to UIComponent?
> RTE:
> TypeError: Error #1009: Cannot access a property or method of a null object reference.
> 	at mx.managers::ToolTipManagerImpl/http://www.adobe.com/2006/flex/mx/internal::createTip()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/managers/ToolTipManagerImpl.as:947]
> 	at mx.managers::ToolTipManagerImpl/http://www.adobe.com/2006/flex/mx/internal::showTimer_timerHandler()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/framework/src/mx/managers/ToolTipManagerImpl.as:1634]
> 	at flash.utils::Timer/_timerDispatch()
> 	at flash.utils::Timer/tick()

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