[FLEX-23218] HorizontalLayout/VerticalLayout virtualized measure() should take into account the preferred sizes of the live renderers

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 4.0 (Release)
• Component/s: Layout - General
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 22/Feb/10 14:27
• Updated: 07/Sep/10 15:57
• Resolved: 24/Aug/10 13:49

Description

Steps to reproduce:
1. Compile and run the attached application
2. Mouse over an item renderer, the renderer expands and the list expands as well
3. Mouse out of the item renderer

Actual Results:
The renderer shrinks, but the List does not (as it is using the cached dimensions).

Expected Results:
The renderer shrinks, and the List shrinks as well.

Workaround (if any):
Turn off virtualization

Repro code:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">

<s:List x="48" y="44" useVirtualLayout="true">
<s:layout>
<s:VerticalLayout horizontalAlign="justify"/>
</s:layout>

<s:ArrayCollection>
<fx:Array>
<fx:String>Hello there</fx:String>
<fx:String>11111 22222</fx:String>
<fx:String>33333 44444</fx:String>
</fx:Array>
</s:ArrayCollection>

<s:itemRenderer>
<fx:Component>
<s:ItemRenderer autoDrawBackground="true">
<s:states>
<s:State name="normal"/>
<s:State name="hovered"/>
</s:states>
<s:Label text="

{data}

" explicitHeight.hovered="50"/>
</s:ItemRenderer>
</fx:Component>
</s:itemRenderer>
</s:List>
</s:Application>