[FLEX-34017] DataGroup#drawBackground called before valid content size available

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Apache Flex 4.11.0
• Component/s: Spark: DataGroup
• Labels: DataGroup contentSize easytest enableMouseWhereTransparent scrolling
• Assignee: Unassigned
• Reporter: Maxim Jurat
• Created: 27/Dec/13 06:40
• Updated: 27/Dec/13 22:09

Description

DataGroup call drawBackground before layout setup valid content size. This cause wrong mouseEnabledWhereTransparent behaviour when scrolling.
Compile this:
<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:local="*">

<s:DataGroup x="5" y="5" width="100" height="100" mouseEnabledWhereTransparent="true"
mouseWheel="trace(event)" id="dataGroup"
itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<s:VerticalLayout clipAndEnableScrolling="true"/>
</s:layout>
<s:dataProvider>
<s:ArrayList>
<fx:String>1</fx:String>
<fx:String>2</fx:String>
<fx:String>3</fx:String>
<fx:String>4</fx:String>
<fx:String>5</fx:String>
<fx:String>6</fx:String>
<fx:String>7</fx:String>
<fx:String>8</fx:String>
<fx:String>9</fx:String>
<fx:String>0</fx:String>
<fx:String>10</fx:String>
<fx:String>11</fx:String>
<fx:String>12</fx:String>
<fx:String>13</fx:String>
<fx:String>14</fx:String>
<fx:String>15</fx:String>
<fx:String>16</fx:String>
<fx:String>17</fx:String>
<fx:String>18</fx:String>
<fx:String>19</fx:String>
<fx:String>20</fx:String>
<fx:String>21</fx:String>
<fx:String>22</fx:String>
<fx:String>23</fx:String>
<fx:String>24</fx:String>
</s:ArrayList>
</s:dataProvider>
</s:DataGroup>

<s:VScrollBar viewport="

{dataGroup}

" x="105" y="5" height="100"/>

</s:Application>

Move mouse on dataGroup (on empty space) and scroll with mouse wheel. Traces appear. Then scroll dataGroup to bottom and repeat scrolling with mouse wheel. There are no new traces, but they should be.