设置NumericStepper控件获得焦点时的边框粗细.

NumericStepper控件的focusThickness 样式学习.
示例：

代码：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/24/setting-the-focus-thickness-on-a-numericstepper-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Script>
        <![CDATA[
            import mx.events.NumericStepperEvent;

            private function numericStepper_change(evt:NumericStepperEvent):void {
                // reset focus rect
                focusManager.setFocus(btn);
                focusManager.setFocus(numericStepper);
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Button id="btn"
                label="click here to remove focus" />
    </mx:ApplicationControlBar>

    <mx:Form>
        <mx:FormItem label="focusThickness:">
            <mx:NumericStepper id="numericStepper"
                    minimum="0"
                    maximum="10"
                    focusThickness="{numericStepper.value}"
                    change="numericStepper_change(event);" />
        </mx:FormItem>
    </mx:Form>

</mx:Application>

也可以通过CSS样式表设置

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/24/setting-the-focus-thickness-on-a-numericstepper-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        NumericStepper {
            focusThickness: 10;
        }
    </mx:Style>

    <mx:ApplicationControlBar dock="true">
        <mx:Button id="btn"
                label="click here to remove focus" />
    </mx:ApplicationControlBar>

    <mx:Form>
        <mx:FormItem label="focusThickness:">
            <mx:NumericStepper id="numericStepper"
                    minimum="0"
                    maximum="10" />
        </mx:FormItem>
    </mx:Form>

</mx:Application>

也可以通过as来设置：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/24/setting-the-focus-thickness-on-a-numericstepper-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.NumericStepperEvent;

            private function numericStepper_change(evt:NumericStepperEvent):void {
                numericStepper.setStyle("focusThickness", evt.value);
                // reset focus rect
                focusManager.setFocus(btn);
                focusManager.setFocus(numericStepper);
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Button id="btn"
                label="click here to remove focus" />
    </mx:ApplicationControlBar>

    <mx:Form>
        <mx:FormItem label="focusThickness:">
            <mx:NumericStepper id="numericStepper"
                    minimum="0"
                    maximum="10"
                    change="numericStepper_change(event);" />
        </mx:FormItem>
    </mx:Form>

</mx:Application>