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null object RTE when closing the parent of an opened empty child node in tree
Author: Bruce Crabtree
Short Link: http://www.houseoffusion.com/groups/flex/thread.cfm/threadid:1668#5220
I have a tree with an XMLListCollection as data provider. I have used
isBranch="true" in the underlying XML to indicate empty nodes that should display
as folders. When I click open an empty child node in the tree and then close the
parent node without first closing the empty child, I get a null object RTE. If I
close the empty child node first, then I don't get the error. From the error
message (below) it seems Flash Player is maybe looking for nonexistent children
of the empty node (?)
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at
mx.controls::Tree/getOpenChildrenStack()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:2404]
at
mx.controls::Tree/getOpenChildrenStack()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:2411]
at
mx.controls::Tree/buildUpCollectionEvents()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:2192]
at mx.controls::Tree/http://www.adobe.com/2006/flex/mx/internal::onTweenEnd()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:2017]
at
mx.effects::Tween/endTween()[C:\dev\flex_201_gmc\sdk\frameworks\mx\effects\Tween.as:510]
at mx.effects::Tween/http://www.adobe.com/2006/flex/mx/internal::doInterval()[C:\dev\flex_201_gmc\sdk\frameworks\mx\effects\Tween.as:548]
at
mx.effects::Tween$/timerHandler()[C:\dev\flex_201_gmc\sdk\frameworks\mx\effects\Tween.as:177]
at flash.utils::Timer/_timerDispatch()
at flash.utils::Timer/tick()
Debug mode highlights line 2404 of the Tree class:
var cursor:IViewCursor =
ICollectionView(iterator.view).createCursor();
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