flex下的树形下拉框treecombobox

不多说了，组件代码如下：

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <mx:ComboBoxxmlns:mx="http://www.adobe.com/2006/mxml"creationComplete="initComponent()">
3. <mx:Script>
4. <![CDATA[
5. importmx.events.FlexEvent;
6. [Bindable]
7. privatevar_label:String;
8. [Bindable]
9. publicvartreeSelectedItem:Object;
11. publicfunctioninitComponent():void
12. {
14. }
16. publicfunctionupdateLabel(event:*):void{
17. _label=event.currentTarget.selectedItem[this.labelField];
18. treeSelectedItem=event.currentTarget.selectedItem;
19. }
21. overrideprotectedfunctionupdateDisplayList(unscaledWidth:Number,
22. unscaledHeight:Number):void
23. {
24. super.updateDisplayList(unscaledWidth,unscaledHeight);
26. if(dropdown&&_label!=null){
27. text=_label;
28. }
29. }
32. ]]>
33. </mx:Script>
34. <mx:dropdownFactory>
35. <mx:Component>
36. <mx:TreecreationComplete="initTree()"change="outerDocument.updateLabel(event)"showRoot="true"height="500"width="500">
37. <mx:Script>
38. <![CDATA[
39. publicfunctioninitTree():void{
40. varlen:int=super.dataProvider.length;
41. for(vari:int;i<len;i++)
42. {
43. super.expandChildrenOf(super.dataProvider[i],true);
44. }
45. super.selectedItem=outerDocument.treeSelectedItem;
46. }
47. ]]>
48. </mx:Script>
49. </mx:Tree>
50. </mx:Component>
51. </mx:dropdownFactory>
52. </mx:ComboBox>

调用的app代码如下：

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <mx:Applicationxmlns:mx="http://www.adobe.com/2006/mxml"layout="absolute"xmlns:ns1="components.*">
3. <ns1:ComboTreewidth="300"id="combo"labelField="@label">
4. <mx:XMLListCollectionid="MailBox">
5. <mx:XMLList>
6. <folderlabel="Mail">
7. <folderlabel="INBOX"/>
8. <folderlabel="PersonalFolder">
9. <Pfolderlabel="Business"/>
10. <Pfolderlabel="Demo"/>
11. <Pfolderlabel="Personal"isBranch="true"/>
12. <Pfolderlabel="SavedMail"/>
13. </folder>
14. <folderlabel="Sent"/>
15. <folderlabel="Trash"/>
16. </folder>
17. <folderlabel="Mail2">
18. <folderlabel="INBOX2"/>
19. <folderlabel="PersonalFolder2">
20. <Pfolderlabel="Business2"/>
21. <Pfolderlabel="Demo2"/>
22. <Pfolderlabel="Personal2"isBranch="true"/>
23. <Pfolderlabel="SavedMail2"/>
24. </folder>
25. <folderlabel="Sent2"/>
26. <folderlabel="Trash2"/>
27. </folder>
28. </mx:XMLList>
29. </mx:XMLListCollection>
30. </ns1:ComboTree>
31. </mx:Application>