Flex ListÐб³¾°É«

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private var _rowColorFunction:Function;
public function set rowColorFunction(f:Function):void
{
this._rowColorFunction = f;
}
public function get rowColorFunction():Function
{
return this._rowColorFunction;
}
override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void
{
if (this.rowColorFunction != null) {
if (dataIndex < this.dataProvider.length) {
var item:Object = this.dataProvider.getItemAt(dataIndex);
color = this.rowColorFunction.call(this, item, color);
}
}
super.drawRowBackground(s, rowIndex, y, height, color, dataIndex);
}

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½ñÌìÎÒÅöµ½¸öÐèÇóÊÇÒª¶ÔListÐбäÉ«£¬ÓÉÓÚÎÒÏëDataGridºÍList¶¼ÊǼ̳ÐÓëListBase,¶¼ÓÐ override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void
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All the listy components in Flex (List, Datagrid, Tree, etc.) have a protected method called drawRowBackground which is in charge of drawing the background for a given row. You typically use it to color a given row based on some facet of the data the row represents (e.g. red background for rows with a negative bank balance).
With DataGrid, it's easy to use, just subclass DataGrid and override the method, parameterized so you can pass in a function to compute the color for each row based on the row index/data/original color/etc. With List (and since ComboBox uses a