Flex中如何创建自定义排序DataGrid控件的例子

接下来的例子演示了如何利用SortField类以及自定义的比较函数，来创建可以自定义排序的DataGrid控件。

让我们先来看一下Demo（可以右键View Source或点击这里察看源代码）：

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下面是完整代码(或点击这里察看)：

 

Download: main.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
     <mx:Script>
         <![CDATA[
                      import mx.collections.SortField;
             import mx.collections.Sort;
            import mx.controls.dataGridClasses.DataGridColumn;
             import mx.utils.ObjectUtil;
 
             private function sortOld():void {
                 var sortField:SortField = new SortField();
                 sortField.compareFunction = test2_compareFunc;
                 sortField.descending = checkBox.selected;
 
                 var oldSort:Sort = new Sort();
                 oldSort.fields = [sortField];
 
                 xmlListColl.sort = oldSort;
                 xmlListColl.refresh();
             }
 
             private function sortNew():void {
                 var sortField:SortField = new SortField();
                 sortField.compareFunction = test3_compareFunc;
                 sortField.descending = checkBox.selected;
 
                 var sort:Sort = new Sort();
                 sort.fields = [sortField];
 
                 xmlListColl.sort = sort;
                 xmlListColl.refresh();
             }
 
             private function resetSort():void {
                 xmlListColl.sort = null;
                 xmlListColl.refresh();
             }
 
             private function dataGridCol_labelFunc(item:XML, col:DataGridColumn):String {
                 return item.*.(@name == col.dataField).text();
             }
 
             private function test2_compareFunc(itemA:XML, itemB:XML):int {
                                  var valueA:String = itemA.test2.text();
                 var valueB:String = itemB.test2.text();
                 return ObjectUtil.stringCompare(valueA, valueB);
             }
 
             private function test3_compareFunc(itemA:XML, itemB:XML):int {
                 var valueA:String = itemA.test3.text();
                 var valueB:String = itemB.test3.text();
                 return ObjectUtil.stringCompare(valueA, valueB);
             }
         ]]>
     </mx:Script>
 
     <mx:XML id="tests" source="tests.xml" />
     <mx:XMLListCollection id="xmlListColl" source="{tests.test}" />
 
     <mx:ApplicationControlBar dock="true">
         <mx:CheckBox id="checkBox" label="descending:" labelPlacement="left" />
 
         <mx:Button label="Sort 'old'"
                 click="sortOld();" />
           <mx:Button label="Sort 'new'"
                 click="sortNew();" />
           <mx:Button label="Reset sort"
                 click="resetSort();" />
     </mx:ApplicationControlBar>
 
     <mx:DataGrid id="dataGrid"
            dataProvider="{xmlListColl}"
             width="300"
             verticalScrollPolicy="on"
             sortableColumns="true">
         <mx:columns>
             <mx:DataGridColumn dataField="old"
                     labelFunction="dataGridCol_labelFunc"
                     sortCompareFunction="test2_compareFunc" />
             <mx:DataGridColumn dataField="new"
                     labelFunction="dataGridCol_labelFunc"
                     sortCompareFunction="test3_compareFunc"  />
         </mx:columns>
     </mx:DataGrid>
</mx:Application>

下面是测试用代码：

Download: tests.xml

<?xml version="1.0" encoding="utf-8"?>
 <tests>
     <test name="group1">
         <test2 name="old">One (old)</test2>
         <test3 name="new">Un (new)</test3>
     </test>
     <test name="group2">
         <test2 name="old">Two (old)</test2>
         <test3 name="new">Deux (new)</test3>
     </test>
 
     <test name="group8">
         <test2 name="old">Eight (old)</test2>
         <test3 name="new">Huit (new)</test3>
     </test>
 </tests>

本文转自：http://blog.minidx.com/2008/04/10/699.html