想了解flex tree自动显示横向滚动条实现代码的相关内容吗，在本文为您仔细讲解横向滚动条的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：tree,滚动条，下面大家一起来学习吧。
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);
}
}
}
