Flex：排序 - 写一个自定义的compareFunction？ [英] Flex: Sort -- Writing a custom compareFunction?

问题描述

好的，我按字母顺序对XMLListCollection进行排序。我有一个问题，但。如果值是全部，我希望它是第一个在列表中。在大多数情况下，这种情况已经发生，但是在ALL之前正在对数字进行排序。我希望ALL永远是我的dataProvider中的第一个选择，然后按字母顺序排列。

所以我正在编写自己的排序函数。有没有办法，我可以检查是否所有的价值观之一，如果不告诉它做的定期比较价值？

这是我有：

 函数myCompare（a：Object，b：Object，fields：Array = null）：int 
 {
 if（String（a）.toLowerCase（）=='all'）
 {
 return -1; 
 
 else 
 if（String（b）.toLowerCase（）=='all'）
 {
 return 1; 
} 
 //需要在这里返回默认比较结果吗？ 
} 
 
 // ------------------------------ 
 
 var排序：Sort = new Sort（）; 
 sort.compareFunction = myCompare; 
  

有没有解决方案，我正在尝试做什么？ <解决方案

解决方案

解决方案

我试过一些东西，我真的很惊讶它实际上工作，但这是我做的。 Sort类有一个名为internalCompare的私有函数。由于它是私人的，你不能称之为。但有一个名为compareFunction的getter函数，如果没有定义比较函数，则返回一个对internalCompare函数的引用。所以我做的是得到这个引用，然后调用它。

  private function myCompare（a：Object，b：Object，fields ：Array = null）：int 
 {
 if（String（a）.toLowerCase（）=='all'）
 {
 return -1; 
} 
 else if（String（b）.toLowerCase（）=='all'）
 {
 return 1; 
} 
 //需要在这里返回默认比较结果吗？ 
 var s：Sort = new Sort（）; 
 var f：Function = s.compareFunction; 
返回f.call（null，a，b，fields）; 
} 
  

OK, I am sorting an XMLListCollection in alphabetical order. I have one issue though. If the value is "ALL" I want it to be first in the list. In most cases this happens already but values that are numbers are being sorted before "ALL". I want "ALL" to always be the first selection in my dataProvider and then the rest alphabetical.

So I am trying to write my own sort function. Is there a way I can check if one of the values is all, and if not tell it to do the regular compare on the values?

Here is what I have:

function myCompare(a:Object, b:Object, fields:Array = null):int
{
    if(String(a).toLowerCase() == 'all')
    {
        return -1;
    }
    else 
        if(String(b).toLowerCase() == 'all')
        {
            return 1;
        }
    // NEED to return default comparison results here?
}

//------------------------------

var sort:Sort = new Sort();
sort.compareFunction = myCompare;

Is there a solution for what I am trying to do?

解决方案

Well I tried something out, and I am really surprised it actually worked, but here is what I did.

The Sort class has a private function called internalCompare. Since it is private you cannot call it. BUT there is a getter function called compareFunction, and if no compare function is defined it returns a reference to the internalCompare function. So what I did was get this reference and then call it.

private function myCompare(a:Object, b:Object, fields:Array = null):int
{
    if(String(a).toLowerCase() == 'all')
    {
        return -1;
    }
    else if(String(b).toLowerCase() == 'all')
    {
        return 1;
    }
    // NEED to return default comparison results here?
    var s:Sort = new Sort();
    var f:Function = s.compareFunction;
    return f.call(null,a,b,fields);
}

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