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https://issues.apache.org/jira/browse/FLEX-33830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799442#comment-13799442
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Alex Harui commented on FLEX-33830:
-----------------------------------
RC2 has been cut without a fix and will probably be the actual release.
> SDK 4.10.0 spark datagrid header and horizontal scrollbar behavior effected
> by app state change
> -----------------------------------------------------------------------------------------------
>
> Key: FLEX-33830
> URL: https://issues.apache.org/jira/browse/FLEX-33830
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.10.0
> Environment: FlashBuilder 4.6, FlashBuilder 4.7, MAC OSX
> Reporter: gkk
> Assignee: Alex Harui
> Priority: Minor
> Labels: datagrid
>
> Changes in an application's state effects spark datagrid header (makes text
> disappear), and horizontal scrollbar (in some cases the scroll bar is
> disabled when it should not be, in other cases the scroll bar is larger than
> it should be). This appears to be a systematic effect (e.g. happens all the
> time; not intermittent).
> Present in SDK 4.10.0, SDK 4.11 rc1. Not present in SDK 4.5.1.
> I'm providing examples of 3 issues observed, which I assume are all related
> to the same bug/fix associated with stage change effecting datagrid display.
> STEPS TO REPRODUCE
> Problem #1 (execute Problem #1 code below):
> 1. Click button to change to state 2.
> 2. Once in state 2, click button again to return to state 1.
> 3. Observe horizontal scroll bar does not permit to view all of datagrid.
> Problem #2 (execute Problem #2 code below):
> 1. Click and drag horizontal scroll bar to right and notice it goes to end of
> column 4.
> 2. Click button to change to state 2.
> 3. Once in state 2, click button again to return to state 1.
> 4. Click and drag horizontal scroll bar to right and notice it goes BEYOND
> end of column 4.
> Problem #3 (execute Problem #3 code below):
> 1. Click button to change to state 2.
> 2. Once in state 2, click button again to return to state 1.
> 3. Notice the header text disappears.
> EXPECTED BEHAVIOR
> Problem #1: The state 1 datagrid horizontal scrollbar should be enabled.
> Problem #2: The state 1 datagrid horizontal scrollbar should stop at the end
> of the last column.
> Problem #3: The state 1 datagrid header text should display.
> ACTUAL BEHAVIOR
> Problem #1: The state 1 datagrid horizontal scrollbar is disabled.
> Problem #2: The state 1 datagrid horizontal scrollbar allows the user to
> scroll beyond the end of the last datagrid column.
> Problem #3: The state 1 datagrid header text is not displayed.
> ----------PROBLEM #1 CODE--------------
> <?xml version="1.0" encoding="utf-8"?>
> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:s="library://ns.adobe.com/flex/spark"
> xmlns:mx="library://ns.adobe.com/flex/mx"
> width="600" maxWidth="600" height="300">
> <fx:Declarations>
> <fx:String id="sampleText">Lorem Ipsum is the standard dummy text of the
> typesetting industry.</fx:String>
> <s:ArrayCollection id="ac">
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> </s:ArrayCollection>
> </fx:Declarations>
> <fx:Script>
> <![CDATA[
> private function stateHandler():void {
> currentState=(currentState=="state2")?"state1":"state2";
> }
> ]]>
> </fx:Script>
> <s:states>
> <s:State name="state1"/>
> <s:State name="state2"/>
> </s:states>
> <s:VGroup horizontalAlign="left" paddingLeft="30" paddingTop="30"
> includeIn="state1">
> <s:Label text="STATE 1" color="0xFF0000"/>
> <s:Label text="1. Click button to change to state 2."/>
> <s:Label text="2. Once in state 2, click button again to return to state 1."/>
> <s:Label text="3. Observe horizontal scroll bar does not permit to view all
> of datagrid."/>
> <s:DataGrid id="dg1" width="500" dataProvider="{ac}">
> <s:columns>
> <s:ArrayList>
> <s:GridColumn dataField="value" headerText="Column 1" width="200"/>
> <s:GridColumn dataField="value" headerText="Column 2" width="200"/>
> <s:GridColumn dataField="value" headerText="Column 3" width="200"/>
> </s:ArrayList>
> </s:columns>
> </s:DataGrid>
> <s:Button label="Change State" click="stateHandler()"/>
> </s:VGroup>
> <s:VGroup horizontalAlign="left" paddingLeft="30" paddingTop="30"
> includeIn="state2">
> <s:Label text="STATE 2" color="0xFF0000"/>
> <s:Label text="1. Click button to change to state 2."/>
> <s:Label text="2. Once in state 2, click button again to return to state 1."/>
> <s:Label text="3. Observe horizontal scroll bar does not permit to view all
> of datagrid."/>
> <s:DataGrid id="dg2" width="500" dataProvider="{ac}">
> <s:columns>
> <s:ArrayList>
> <s:GridColumn dataField="value" headerText="Column 1" width="200"/>
> <s:GridColumn dataField="value" headerText="Column 2" width="200"/>
> <s:GridColumn dataField="value" headerText="Column 3" width="200"/>
> </s:ArrayList>
> </s:columns>
> </s:DataGrid>
> <s:Button label="Change State" click="stateHandler()"/>
> </s:VGroup>
> </s:Application>
> ----------PROBLEM #2 CODE--------------
> <?xml version="1.0" encoding="utf-8"?>
> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
> xmlns:s="library://ns.adobe.com/flex/spark"
> xmlns:mx="library://ns.adobe.com/flex/mx"
> width="600" maxWidth="600" height="450">
> <fx:Declarations>
> <fx:String id="sampleText">Lorem Ipsum is the standard dummy text of the
> typesetting industry.</fx:String>
> <s:ArrayCollection id="ac">
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> <s:DataItem value="{sampleText}"/>
> </s:ArrayCollection>
> </fx:Declarations>
> <fx:Script>
> <![CDATA[
> private function stateHandler():void {
> currentState=(currentState=="state2")?"state1":"state2";
> }
> ]]>
> </fx:Script>
> <s:states>
> <s:State name="state1"/>
> <s:State name="state2"/>
> </s:states>
> <s:VGroup paddingLeft="30" paddingTop="30">
> <s:Label text="1. Click and drag horizontal scroll bar to right and notice it
> goes to end of column 4."/>
> <s:Label text="2. Click button to change to state 2."/>
> <s:Label text="3. Once in state 2, click button again to return to state 1."/>
> <s:Label text="4. Click and drag horizontal scroll bar to right and notice it
> goes BEYOND end of column 4"/>
> <s:VGroup horizontalAlign="left" includeIn="state1">
> <s:Label text="STATE 1" color="0xFF0000"/>
> <s:DataGrid id="dg1" width="500" dataProvider="{ac}"
> alternatingRowColors="[0xFFFFFF,0xBBBBBB]">
> <s:columns>
> <s:ArrayList>
> <s:GridColumn headerText="Col 1" dataField="value" width="75"/>
> <s:GridColumn headerText="Col 2" dataField="value" width="75"/>
> <s:GridColumn headerText="Col 3" dataField="value" width="200"/>
> <s:GridColumn headerText="Col 4" dataField="value" width="200"/>
> </s:ArrayList>
> </s:columns>
> </s:DataGrid>
> <s:Button label="Change State" click="stateHandler()"/>
> </s:VGroup>
> <s:VGroup horizontalAlign="left" includeIn="state2">
> <s:Label text="STATE 2" color="0xFF0000"/>
> <s:DataGrid id="dg2" width="500" dataProvider="{ac}"
> alternatingRowColors="[0xFFFFFF,0xBBBBBB]">
> <s:columns>
> <s:ArrayList>
> <s:GridColumn headerText="Col 1" dataField="value" width="75"/>
> <s:GridColumn headerText="Col 2" dataField="value" width="75"/>
> <s:GridColumn headerText="Col 3" dataField="value" width="200"/>
> <s:GridColumn headerText="Col 4" dataField="value" width="200"/>
> </s:ArrayList>
> </s:columns>
> </s:DataGrid>
> <s:Button label="Change State" click="stateHandler()"/>
> </s:VGroup>
> </s:VGroup>
> </s:Application>
> ----------PROBLEM #3 CODE--------------
> Use Problem #2 code, but change the stateHandler() function to:
> private function stateHandler():void {
> currentState=(currentState=="state2")?"state1":"state2";
> if (currentState=="state2") {
> dg1.dataProvider=null;
> dg1.dataProvider=ac;
> }
> }
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