[FLEX-34212] invalidIndex RTE in LinearLayoutVector when mouse scrolling List

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Apache Flex 4.11.0
• Fix Version/s: Apache Flex 4.13.0
• Component/s: Spark: List, Spark: VerticalLayout
• Labels: easytest
• Assignee: Mihai Chira
• Reporter: Mihai Chira
• Created: 07/Apr/14 11:45
• Updated: 10/Nov/14 16:26
• Resolved: 10/Nov/14 16:26

Description

Steps to reproduce:
1. Import and run the attached project.
2. Scroll the list to the bottom.

Actual result: the RTE below, caused by the perfectly timed MOUSE_WHEEL event.
Desired result: no RTE, and the list should keep adding items despite the MOUSE_WHEEL event.

Notes:

• workaround: instead of resetting the dataProvider, calling addAll() on it avoids this RTE.
• four of our users reported this bug within a few months. This means that the odds of scrolling the list exactly between setting its dataProvider and its commitProperties() function being called is not so low.
• s:DataGrid seems to work fine in this scenario.

RTE:
Error: invalidIndex
at spark.layouts.supportClasses::LinearLayoutVector/start()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\supportClasses\LinearLayoutVector.as:893]
at spark.layouts.supportClasses::LinearLayoutVector/getBounds()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\supportClasses\LinearLayoutVector.as:1117]
at spark.layouts::VerticalLayout/getElementBounds()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\VerticalLayout.as:907]
at spark.layouts::VerticalLayout/findLayoutElementBounds()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\VerticalLayout.as:1187]
at spark.layouts::VerticalLayout/getElementBoundsBelowScrollRect()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\VerticalLayout.as:1217]
at spark.layouts.supportClasses::LayoutBase/getVerticalScrollPositionDelta()[E:\dev\4.y\frameworks\projects\spark\src\spark\layouts\supportClasses\LayoutBase.as:1357]
at spark.components.supportClasses::GroupBase/getVerticalScrollPositionDelta()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\supportClasses\GroupBase.as:1420]
at spark.components::VScrollBar/http://www.adobe.com/2006/flex/mx/internal::mouseWheelHandler()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\VScrollBar.as:559]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]
at mx.managers::SystemManager/mouseEventHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\SystemManager.as:2918]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]
at _MouseOutGlitch/add20Items()[C:\Users\Developer1\workspace\_MouseOutGlitch\src\_MouseOutGlitch.mxml:36]
at Function/http://adobe.com/AS3/2006/builtin::apply()
at SetIntervalTimer/onTimer()
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()

Issue Links

• relates to: FLEX-28291 Linear Vector Layout on the ComboBox