flex4 改变DataTip的样式
由于暂时只用到二种，所以先附上代码，其它类型的可参考修改
<mx:ColumnChart width="100%" fontSize="12" fontWeight="normal" fontFamily="宋体" paddingLeft="5" paddingRight="5"
showDataTips="true" dataTipRenderer="com.common.custom.skin.DataTipSkin" dataProvider="{_medalsAC}">
<mx:horizontalAxis>
<mx:CategoryAxis categoryField="shi"/>
</mx:horizontalAxis>
<mx:series>
<mx:ColumnSeries xField="shi" yField="dzsl" displayName="电站总数"/>
</mx:series>
</mx:ColumnChart>
<mx:PieChart id="chart" width="100%" paddingRight="5" paddingLeft="5" fontSize="12" fontWeight="normal" fontFamily="宋体"
showDataTips="true" dataTipRenderer="com.common.custom.skin.DataTipSkin" dataProvider="{_medalsAC}">
<mx:series>
<mx:PieSeries nameField="shi" labelFunction="displayZzjrl" displayName="{}" labelPosition="callout"
field="zzjrl"/>
</mx:series>
</mx:PieChart>
com.common.custom.skin.DataTipSkin文件内容如下：
<?xml version="1.0" encoding="utf-8"?>
<mx:VBox xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"
backgroundColor="#FFFEE9" borderColor="#010101" borderStyle="solid" paddingTop="5" paddingBottom="5" paddingRight="10"
paddingLeft="10" verticalGap="-2" color="#000000" backgroundAlpha="0.81">
<mx:Label text="{_valueText}" width="100%" textAlign="left" fontSize="12" fontWeight="normal"/>
<mx:Label text="{_labelText}" width="100%" textAlign="left" fontWeight="normal" fontSize="12"/>
<fx:Script>
<![CDATA[
import mx.charts.ColumnChart;
import mx.charts.HitData;
import mx.charts.PieChart;
import mx.charts.series.LineSeries;
import mx.charts.series.PieSeries;
import mx.charts.series.items.ColumnSeriesItem;
import mx.charts.series.items.LineSeriesItem;
import mx.charts.series.items.PieSeriesItem;
[Bindable]
private var _labelText:String;
[Bindable]
private var _valueText:String;
override public function set data(value:Object):void {
var hd:HitData = value as HitData;
var item:* = hd.chartItem;
var ser:* = hd.element;
if (item is ColumnSeriesItem) {
//ColumnSeries1287
_labelText = String(item.xValue + '：' + item.yValue);
_valueText = String(ser.displayName);
} else if (item is PieSeriesItem) {
//PieSeries1361
_valueText = value.item[PieSeries(ser).nameField] + "：" + PieSeriesItem(item).value.toString();
_labelText = (" " + PieSeriesItem(item).percentValue).substr(0, 6) + "%";
}
}
]]>
</fx:Script>
</mx:VBox>
