FLEX 仿Google联想框效果

FLEX--仿Google联想框效果--现在好多地方都用到了这样的效果,当然,现在Google下线了,不让用了,但是跟网上说的一样,想办法,它还是能出来的

 

首先是事件源，也就是从何而起，如下的一个输入框：
复制代码 代码如下:
<mx:FormItem label="集团客户:" width="42%">
<!--change1-->
<mx:TextInput id="txtAssociation" width="235" maxChars="32" change="associate();"/>
</mx:FormItem>

然后就是处理效果，这些内容都是从数据库得到的数据，动态的查出的。
复制代码 代码如下:
import mx.collections.ArrayCollection;
import mx.events.FlexMouseEvent;
import mx.events.ListEvent;
import mx.managers.PopUpManager;
import resources.com.list.Association;
// 经过渲染的联想结果List
private var list:Association;
// 临时字符串,用于判断当keyUp事件发生时,联想框的值是否发生改变,如未改变则不联想
private var temp:String = '';
private function changeAssociation():void{
temp='';
txtAssociation.text='';
associationResult=null;
if(list != null){
PopUpManager.removePopUp(list);
list = null;
// 清空临时字符串
}
}
private function associate():void {
var str:String = txtAssociation.text;
if(str.length<2){
associationResult=null;
}
if (str != temp) {
if(str.length < 2){
if(list != null){
PopUpManager.removePopUp(list);
list = null;
// 清空临时字符串
temp = '';
}
return;
}
temp = str;
var params:Object = {};
params['areaNO'] = cbxArea.selectedItem.data;
params['netType'] = cbxNetType.selectedItem.data;
params['str'] = str;
params['handle'] = 'associate';
service4association.send(params);
}
}
private function openAssociation():void {
if(service4association.lastResult.items != null)
createAndShow(service4association.lastResult.items.item);
else if(list != null){
PopUpManager.removePopUp(list);
list = null;
// 清空临时字符串
temp = '';
}
}
private function createAndShow(dp:Object):void {
// 每次打开联想框以前, 先清理缓存
if(list != null){
// 将联想框从PopUpManager中移除
PopUpManager.removePopUp(list);
// 清空联想框实例
list = null;
}
list = new Association();
//指定数据源
list.dataProvider = dp;
//获取鼠标坐标并赋值给list
list.x = txtAssociation.x + 219;
list.y = txtAssociation.y + 205;
//大小
list.minWidth = 400;
list.maxHeight = 270;
//注册list外鼠标按下和项目单击事件
list.addEventListener(FlexMouseEvent.MOUSE_DOWN_OUTSIDE, mouseDownOutsideHandler);
list.addEventListener(ListEvent.ITEM_CLICK, itemClik);
//弹出并显示list
PopUpManager.addPopUp(list, this, false);
}
private var associationResult:Object;
private function itemClik(event:ListEvent):void{
associationResult = ArrayCollection(Association(event.target).dataProvider).getItemAt(event.rowIndex);
txtAssociation.text = associationResult.label;
//Alert.show(associationResult.data);
removePopUpIDisplay(Association(event.target));
}
private function mouseDownOutsideHandler(event:MouseEvent):void{
removePopUpIDisplay(Association(event.target));
}
private function removePopUpIDisplay(obj:Association):void{
// 清空临时字符串
temp = '';
obj.removeEventListener(FlexMouseEvent.MOUSE_DOWN_OUTSIDE, mouseDownOutsideHandler);
PopUpManager.removePopUp(obj);
}
/**--------------------------联想-------------------------------**/

还有一个类，这里也贴出来吧。呵呵，共享原则，完全可实现。
复制代码 代码如下:
<?xml version="1.0" encoding="utf-8"?>
<mx:List xmlns:mx="http://www.adobe.com/2006/mxml" initialize="initApp();" xmlns:filters="flash.filters.*"
alternatingItemColors="[#EEEEEE, white]" buttonMode="true" >
<mx:Script>
<!--[CDATA[
private function initApp():void{
showEffect.play();
}
]]-->
</mx:Script>
<mx:itemRenderer>
<mx:Component>
<mx:HBox horizontalGap="0" paddingLeft="5">
<mx:Image source="@Embed('resources/icons/building.png')"/>
<mx:Text text="{data.prefix}" paddingLeft="5"/>
<mx:Text text="{data.str}" color="green"/>
<mx:Text text="{data.suffix}"/>
</mx:HBox>
</mx:Component>
</mx:itemRenderer>
<mx:Parallel id="showEffect" target="{this}" duration="300">
<mx:Fade />
<mx:WipeDown />
</mx:Parallel>
</mx:List>

FLEX--仿Google联想框效果--现在好多地方都用到了这样的效果,当然,现在Google下线了,不让用了,但是跟网上说的一样,想办法,它还是能出来的.呵呵,不过对于我们没有多少必要了.这里在Flex当中也是为了能够更好的实现查询效果.所以也要求做这么一个,动态查询.