flex tree maxHorizontalScrollPosition 如何设置

[siy020513]

flex tree 横向滚动条显示出来了，但有的节点过长却老是显示不全，
如果将maxHorizontalScrollPosition 设置成一个很大的值的话滚动条就会显示过长，出来一段空白
而且滚动条不能隐藏。
请教各位大虾，如何动态地设置maxHorizontalScrollPosition 属性 或有其他什么办法让滚动条显示正常。
在这里先谢谢了

[sxthcj2000]

顶一把

[yb121331]

刚刚开始学习哦

[水中影子]

顶！！！没想到什么好的办法

[siy020513]

SF
今天第一贴？

[siy020513]

没人回答自己顶
囧。。。

[dy5599]

我昏，，，，

[CCjian]

居然没有FLEX的..
之前用时都没有发现有这个问题,长度是有限的.
整理如下

package myTest
{
	import flash.events.Event;
	
	import mx.controls.Alert;
	import mx.controls.Tree;
	import mx.core.mx_internal;
	public class AutoSizeTree extends Tree
	{
		
		public function AutoSizeTree()
		{
			super();
		}
		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);
     
              if (diffWidth <= 0)maxHorizontalScrollPosition = NaN;                
              else maxHorizontalScrollPosition = diffWidth;         
              super.updateDisplayList(unscaledWidth, unscaledHeight); 
       	} 
	}
}

[musicark]

学习了，谢谢~

[yujia1655]

学习了

[siy020513]

非常感谢14楼
CCjian
(默契)

问题终于解决了
我把代码贴出来吧，对新手应该还是有很大帮助的

package com.render
{
	import flash.events.Event;
	
	import mx.controls.Alert;
	import mx.controls.Tree;
	import mx.core.ScrollPolicy;
	import mx.core.mx_internal;

	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); 
		}
	}
}

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:cmp="com.render.*" 
	height="100%" width="100%" paddingTop="0" paddingBottom="0" paddingLeft="0" paddingRight="0">
	<cmp:AutoSizeTree
			id="checkTree"
			itemRenderer="com.render.CheckTreeRenderer"
			change="updataDataGrid()"
			labelField="@label"
 			width="100%" height="100%"  
 			horizontalScrollPolicy="auto" >
 	</cmp:AutoSizeTree>
</mx:Application>

[fblgzdq]

f

[shiliufu]

up

[siy020513]

....
都被推荐了
可惜就是搞不出来啊

[macklau]

ding

[wodespace]

学习啦，我一直很想做这个

[bird_boy]

学习了！！

[zhangyongtian_0810]

学习下

[changrui11]

想问下你的横向滚动条怎么加的啊

[siy020513]

[Quote=引用 26 楼 changrui11 的回复:]
想问下你的横向滚动条怎么加的啊
[/Quote]
我空间里有代码
你去看看吧

[subehappy]

cmp:AutoSizeTree显示不了数据
mx:Tree是正常的