在Flex组件LinkButton里，我们可以用useHandCursor属性来控制是否使用手型光标。现在我们要实现在LinkButton的enable=false时，useHandCursor=false。反过来，他们要同时为true。
下面的例子显示了当Flex里的LinkButton不可用时，如何移除它上的手型光标，让光标回到箭头。
我们采用的办法是扩展LinkButton类，覆盖了enabled的setter方法，在里面加上了改变useHandCursor属性的语句。
请看下面的例子：
main.mxml
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/09/07/removing-the-hand-cursor-from-a-disabled-linkbutton-control-in-flex/ -->
<mx:Application name="LinkButton_useHandCursor_test"
xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:comps="comps.*"
layout="horizontal"
verticalAlign="middle"
backgroundColor="white"> <mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="enabled:">
<mx:CheckBox id="checkBox" selected="true" />
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar> <mx:LinkButton id="linkButton"
label="Default LinkButton"
enabled="{checkBox.selected}" /> <comps:DisabledLinkButtonMXML id="linkButton2"
label="Custom LinkButton (MXML)"
enabled="{checkBox.selected}" /> <comps:DisabledLinkButtonAS id="linkButton3"
label="Custom LinkButton (ActionScript)"
enabled="{checkBox.selected}" /> </mx:Application>
DisabledLinkButtonMXML组件：
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/09/07/removing-the-hand-cursor-from-a-disabled-linkbutton-control-in-flex/ -->
<mx:LinkButton xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Script>
<![CDATA[
override public function set enabled(value:Boolean):void {
//让enabled和useHandCursor同步
super.enabled = value;
useHandCursor = value;
}
]]>
</mx:Script> </mx:LinkButton>
DisabledLinkButtonAS组件
/**
* http://blog.flexexamples.com/2008/09/07/removing-the-hand-cursor-from-a-disabled-linkbutton-control-in-flex/
*/
package comps {
import mx.controls.LinkButton; public class DisabledLinkButtonAS extends LinkButton { /**
* Constructor.
*/
public function DisabledLinkButtonAS() {
//调用父类的构造函数
super();
} /**
* @private
*/
override public function set enabled(value:Boolean):void {
super.enabled = value;
useHandCursor = value;
}
}
}
很显然， DisabledLinkButtonMXML和 DisabledLinkButtonAS组件实现的是一样的功能。只是用的语法不一样。