[Flex] 组件Tree系列 —— 利用firstVisibleItem属性,设置或取得第一个显示节点

mxml:

 1 <?xml version="1.0" encoding="utf-8"?>

 2 <!--功能描述: 利用firstVisibleItem属性,设置或取得第一个显示节点 -->

 3 <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 

 4                xmlns:s="library://ns.adobe.com/flex/spark" 

 5                xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">

 6     <fx:Script>

 7         <![CDATA[

 8             import mx.events.FlexEvent;

 9             

10             import spark.events.IndexChangeEvent;

11             

12             protected function comboBox_changeHandler(event:IndexChangeEvent):void

13             {

14                 tree.firstVisibleItem = comboBox.selectedItem;

15             }

16             

17             protected function tree_creationCompleteHandler(event:FlexEvent):void

18             {

19                 tree.expandChildrenOf(data, true);

20             }

21             

22         ]]>

23     </fx:Script>

24     <fx:Declarations>

25         <!-- 将非可视元素(例如服务、值对象)放在此处 -->

26         

27             <fx:XML id="data" xmlns="">

28                 <data>

29                     <item label="周星驰">

30                         <item label="1988">

31                             <item label="《霹雳先锋》香港票房8916612 " />

32                             <item label="《捕风汉子》香港票房3149395 " />

33                             <item label="《最佳女婿》香港票房5807710 " />

34                         </item>

35                         <item label="1989">

36                             <item label="《龙在天涯》香港票房6809853 " />

37                             <item label="《义胆群英》香港票房7913329 " />

38                             <item label="《流氓差婆》香港票房5624622 " />

39                             <item label="《风雨同路》香港票房9335299 " />

40                         </item>

41                         <item label="1990 ">

42                             <item label="《望夫成龙》香港票房13703364 " />

43                             <item label="《咖喱辣椒》香港票房15777856 " />

44                             <item label="《小偷阿星》香港票房7968106 " />

45                             <item label="《师兄撞鬼》香港票房12128944 " />

46                             <item label="《赌圣》香港票房41326156 " />

47                             <item label="《无敌幸运星》香港票房18799869" />

48                             <item label="《江湖最后一个大佬》香港票房5495811 " />

49                         </item>

50                     </item>

51                     <item label="李连杰">

52                         <item label="1992">

53                             <item label="笑傲江湖之东方不败(1992)" />

54                             <item label="黄飞鸿之二男儿当自强(1992)" />

55                             <item label="黄飞鸿之三狮王争霸(1992)" />

56                         </item>

57                         <item label="1993">

58                             <item label="方世玉Ⅱ万夫莫敌(1993)" />

59                             <item label="倚天屠龙记之魔教教主(1993)" />

60                             <item label="黄飞鸿之铁鸡斗蜈蚣(1993)" />

61                             <item label="太极张三丰(1993)" />

62                         </item>

63                         <item label="1994">

64                             <item label="新少林五祖(1994)" />

65                             <item label="精武英雄(1994)" />

66                             <item label="中南海保镖(1994) " />

67                             <item label="给爸爸的信(1995" />

68                         </item>

69                         <item label="1995">

70                             <item label="鼠胆龙威(1995)" />

71                             <item label="给爸爸的信(1995" />

72                         </item>

73                     </item>

74                 </data>

75             </fx:XML>

76         

77         <s:XMLListCollection id="xml" source="{data..item}" >

78             

79         </s:XMLListCollection>

80     </fx:Declarations>

81     

82     <s:controlBarContent>

83         <s:Form styleName="plain">

84             <s:FormItem label="firstVisibleItem">

85                 <s:ComboBox id="comboBox" dataProvider="{xml}" labelField="@label" width="300" change="comboBox_changeHandler(event)" />

86             </s:FormItem>

87         </s:Form>

88     </s:controlBarContent>

89     <mx:Tree id="tree" dataProvider="{data}" labelField="@label" showRoot="false" width="50%" alternatingItemColors="[0xeeeeee,0xffffff]" rowCount="6" creationComplete="tree_creationCompleteHandler(event)">

90         

91     </mx:Tree>

92 </s:Application>

 

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