我在flex中创建了嵌套复选框。
我只想选择一个父复选框。如果选择父复选框（Cluster1），则该父复选框的所有子复选框都将被选中，并且在取消选中当前复选框之前，不应单击其他父复选框。

复选框树当前XML结构：

public var treeData:XML =   <item name="vCenter Server" type="Server">
                            <item name = "Datacenter" type="Datacenter" checked="false">
                            <item name="Cluster1" type="ClusterComputeResource" id="mycusterOne" checked="false">
                            <item name = "Host 1" type="HostSystem" checked="false"/>
                            <item name = "Host 2" type="HostSystem" checked="false"/></item>
                            <item name="Cluster2" type="ClusterComputeResource" id="mycusterTwo" checked="false">
                            <item name = "Host 1" type="HostSystem" checked="false"/>
                            <item name = "Host 2" type="HostSystem" checked="false"/></item></item>  
                            <item name = "Host 3" type="HostSystem" checked="false"> </item></item>;

和代码：

protected function chk_clickHandler(event:MouseEvent):void
        {
            var myListData:TreeListData = TreeListData(this.listData);
            var selectedNode:Object = myListData.item;
            var tree:Tree = Tree(myListData.owner);
            var toggle:Boolean = chk.selected;
            if(this.chk.selected){
                //this.checked = true;
                this.itemXml.@checked = "true";
            }
            else
            {
                //this.checked = false;
                this.itemXml.@checked = "false";
            }
            var toggle:Boolean = chk.selected;

            if (toggle)
            {
                toggleChildren(data, tree, "true");
            }
            else
            {
                toggleChildren(data, tree, "false");
                if( this.itemXml.@type == "HostSystem" ){
                    toggleParents(data, tree, "false");
                }
            }

        }

 private function toggleChildren (item:Object, tree:Tree, checked:String):void
        {
            if (item == null) {
                return;
            } else {
                if(item.@type == 'HostSystem') {
                    item.@checked = checked;
                }
                var treeData:ITreeDataDescriptor = tree.dataDescriptor;
                if (treeData.hasChildren(item)) {
                    var children:ICollectionView = treeData.getChildren (item);
                    var cursor:IViewCursor = children.createCursor();
                    while (!cursor.afterLast) {
                        toggleChildren(cursor.current, tree, checked);
                        cursor.moveNext();
                    }
                }
            }

        }

        private function toggleParents (item:Object, tree:Tree, checked:String):void
        {

            if (item == null)
            {
                return;
            }
            else
            {
                if(item.@type == 'ClusterComputeResource')
                {
                    item.@checked = checked;
                }
                item.@checked = checked;
                toggleParents(tree.getParentItem(item), tree, checked);
            }
        }