[FLEX-18746] Exception inside expandItem() when collapsing branch with all items removed since branch opening

• Type: Bug
• Status: In Progress
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 3.2 (Release)
• Component/s: mx: Tree
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 09/Apr/09 02:50
• Updated: 24/Jan/18 10:07

Description

Steps to reproduce:
Launch the following example and wait 6 sec:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
creationComplete="init();">

<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;

[Bindable]
private var dataProvider:ArrayCollection;

private var folder0:Object;

private var folder1:Object;

private var item:Object;

private function init():void
{
dataProvider = new ArrayCollection();
folder0 =

{ label: "Some folder 0", children: new ArrayCollection() }

;
item =

{ label: "Item" }

;
folder1 =

{ label: "Some folder 1", children: new ArrayCollection([ item ]) }

;
dataProvider.addItem(folder1);

var timer1:Timer = new Timer(2000, 1);
timer1.addEventListener(TimerEvent.TIMER, timer1_timerHandler);
timer1.start();

var timer2:Timer = new Timer(4000, 1);
timer2.addEventListener(TimerEvent.TIMER, timer2_timerHandler);
timer2.start();

var timer3:Timer = new Timer(6000, 1);
timer3.addEventListener(TimerEvent.TIMER, timer3_timerHandler);
timer3.start();
}

private function timer1_timerHandler(event:TimerEvent):void

{ tree.expandItem(folder1, true, true, true); }

private function timer2_timerHandler(event:TimerEvent):void

{ dataProvider.addItemAt(folder0, 0); ArrayCollection(folder1.children).removeItemAt(0); tree.expandItem(folder0, true, true, true); ArrayCollection(folder0.children).addItem(item); }

private function timer3_timerHandler(event:TimerEvent):void

{ tree.expandItem(folder1, false, true, true); }

]]
>
</mx:Script>

<mx:Label text="Just wait 6 sec and you'll see the exception." fontSize="20"
top="50" horizontalCenter="0"/>

<mx:Tree dataProvider="

{dataProvider}

" id="tree" width="200" height="200"
horizontalCenter="0" verticalCenter="0"/>

</mx:Application>

Actual Results:
TypeError: Error #1010: Term is undefined and has no properties
at mx.controls::Tree/expandItem()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\Tree.as:1772]
at mx.controls::Tree/http://www.adobe.com/2006/flex/mx/internal::expandItemHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\Tree.as:3418]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:9298]
at mx.controls::Tree/http://www.adobe.com/2006/flex/mx/internal::dispatchTreeEvent()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\Tree.as:3334]
at mx.controls.treeClasses::TreeItemRenderer/disclosureMouseDownHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\controls\treeClasses\TreeItemRenderer.as:594]

Expected Results:
Node collapse without exception

Workaround (if any):
Do not use open/close animation, ex. set <mx:Tree openDuration="0"/>