flex tree自动显示横向滚动条想必有很多的朋友都不会吧，下面与大家分享下具体的实现方法，感兴趣的你可不要错过了哈
复制代码 代码如下:
package com.anydata.consumer.components
{
import flash.events.Event;
import mx.controls.Tree;
import mx.core.ScrollPolicy;
import mx.core.mx_internal;
/**
* 自动显示横向滚动条
*/
public class AutoSizeTree extends Tree
{
public function AutoSizeTree()
{
super();
horizontalScrollPolicy=ScrollPolicy.AUTO;
}
override public function get maxHorizontalScrollPosition():Number
{
if (isNaN(mx_internal::_maxHorizontalScrollPosition))
return 0;
return mx_internal::_maxHorizontalScrollPosition;
}
override public function set maxHorizontalScrollPosition(value:Number):void
{
mx_internal::_maxHorizontalScrollPosition=value;
dispatchEvent(new Event("maxHorizontalScrollPositionChanged"));
scrollAreaChanged=true;
invalidateDisplayList();
}
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
var diffWidth:Number=measureWidthOfItems(0, 0) - (unscaledWidth - viewMetrics.left - viewMetrics.right);
var indentation:Number=getStyle("indentation");
if (diffWidth <= 0)
maxHorizontalScrollPosition=NaN;
else
maxHorizontalScrollPosition=diffWidth + indentation;
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
}
}
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