John Hall created FLEX-35369:
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Summary: DragProxy Error
Key: FLEX-35369
URL: https://issues.apache.org/jira/browse/FLEX-35369
Project: Apache Flex
Issue Type: Bug
Components: Spark: Window
Affects Versions: Apache Flex 4.16.0
Environment: Windows 10
Reporter: John Hall
Fix For: Apache Flex 4.16.1
Working with NativeDragDrop on occasion I get the following error
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at
mx.managers.dragClasses::DragProxy/mouseUpHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy.as:660]
at
mx.managers.dragClasses::DragProxy/mouseLeaveHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/framework/src/mx/managers/dragClasses/DragProxy.as:561]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at
mx.managers::WindowedSystemManager/mouseLeaveHandler()[/Users/justinmclean/Documents/ApacheFlex4.16/frameworks/projects/airframework/src/mx/managers/WindowedSystemManager.as:2306]
Alex Harui's comment on the forum was:
_Hi,
The stack trace points out a legitimate bug. If the Drag starts, but then
the mouse goes out of the app and the button is released without any
mouseMove events coming into the DragProxy, the lastMouseEvent has not
been set and you'll get this crash.
I'm not quite sure how you can get zero "mouseMove" events, but maybe if
you drag fast enough while the app is computing the thing to drag.
File a bug if you can. You shouldn't need to build the SDK to fix this
problem. You can use monkey-patching instead. Search the internet for
articles on "Flex Monkey Patching".
Thanks,
-Alex
_
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