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https://issues.apache.org/jira/browse/FLEX-33537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239652#comment-14239652
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Alex Harui commented on FLEX-33537:
-----------------------------------
The fix in commit d5c329722cd60568c53210973024b591b912b486 has had a lot of
side-effects. There is no protocol in the framework for knowing that a
component has deferred assignment of stage.focus. Any other code depending on
stage.focus pointing to the currently focused item is at risk because it can't
know that stage.focus is about to be assigned "later".
Normally, I would tell the bug author that Flex uses a validation/invalidation
mechanism and calling validateNow() before assigning focus would probably do
the trick. That needs to be verified for this scenario.
I suppose we could add code to UIComponent or some other base class to call
validateNow() on itself before assigning focus, but that sets a precedence of
adding validateNow() calls to other places where you can get fooled by the
validation mechanism and potentially affect performance.
> Spark TextArea writing in prompt text format
> --------------------------------------------
>
> Key: FLEX-33537
> URL: https://issues.apache.org/jira/browse/FLEX-33537
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: TextArea, Spark: TextInput
> Affects Versions: Apache Flex 4.9.0
> Reporter: Curtis Aube
> Assignee: Mark Kessler
> Fix For: Apache Flex Next
>
> Attachments: enter.zip
>
>
> Initialize a s:TextArea, set the prompt text to something and set the text to
> something. Sometime later set the text to empty string, remove the TextArea
> from the display, add it to back the display and set focus on it. The next
> time you type, you will be typing in the prompt text format.
> Ex.
> <?xml version="1.0" encoding="utf-8"?>
> <s:Application minHeight="600" minWidth="955"
> xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:mx="library://ns.adobe.com/flex/mx"
> xmlns:s="library://ns.adobe.com/flex/spark">
> <fx:Script>
> <![CDATA[
> private function selectTextArea():void
> {
> testTextArea.text = "";
> box.removeAllElements();
> box.addElement(testTextArea);
> testTextArea.setFocus();
> }
> ]]>
> </fx:Script>
> <s:VGroup>
> <s:HGroup>
> <s:Button label="Break text area"
> click="{selectTextArea()}"/>
> </s:HGroup>
> <s:HGroup id="box">
> <s:TextArea id="testTextArea" text="Some text"
> prompt="Enter something..."/>
> </s:HGroup>
> </s:VGroup>
> </s:Application>
> Another issue is: If you try to set the focus before removing and adding the
> TextArea, the focus rectangle doesn't show up.
> Workaround: Don't set the focus immediately after adding the TextArea such as
> using callLater.
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