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https://issues.apache.org/jira/browse/FLEX-34340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mihai Chira updated FLEX-34340:
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Attachment: _stepperStillRespondingToWheel.fxp
> NumericStepper still responds to mouse wheel after being removed from stage
> ---------------------------------------------------------------------------
>
> Key: FLEX-34340
> URL: https://issues.apache.org/jira/browse/FLEX-34340
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: NumericStepper
> Affects Versions: Apache Flex 4.12.0
> Reporter: Mihai Chira
> Attachments: _stepperStillRespondingToWheel.fxp
>
>
> *Steps to reproduce*:
> 0. Import and run the attached project.
> 1. Click on the numeric stepper.
> 2. Roll the mouse wheel. Notice label changing as expected.
> 3. Shift+Click on the numeric stepper and wait for it to be removed from
> stage.
> 4. Roll the mouse wheel. Notice label changing, although the component is not
> on stage anymore.
> 5. Wait 2 seconds for stepper to be 'dismantled'.
> 6. Roll the mouse wheel
> *Actual behaviour*: at step 4 the NumericStepper still reacts to mouse wheel
> events. Also, at step 6, the RTE below is thrown.
> *Desired behaviour*: at step 4 the NumericStepper does not react to the mouse
> wheel anymore, and at step 6 no error is thrown.
> *NOTE*: After step 4, rolling the mouse wheel after clicking anywhere on
> stage works as expected.
> *RTE at step 6*:
> Main Thread (Suspended: TypeError: Error #1009: Cannot access a property or
> method of a null object reference.)
> spark.components::NumericStepper/applyDisplayFormatFunction
> spark.components::NumericStepper/setValue
> spark.components::Spinner/system_mouseWheelHandler
> _NumericStepper/system_mouseWheelHandler
> flash.events::EventDispatcher/dispatchEventFunction [no source]
> flash.events::EventDispatcher/dispatchEvent [no source]
> mx.core::UIComponent/dispatchEvent
> mx.managers::SystemManager/mouseEventHandler
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