带搜索的comboBox组件
?ComboBoxSearch：
package com.view{import flash.events.Event;import flash.events.TimerEvent;import flash.utils.Timer;import flashx.textLayout.operations.CutOperation;import flashx.textLayout.operations.DeleteTextOperation;import flashx.textLayout.operations.FlowOperation;import flashx.textLayout.operations.InsertTextOperation;import mx.core.mx_internal;import org.osmf.events.TimeEvent;import spark.components.ComboBox;import spark.events.DropDownEvent;import spark.events.TextOperationEvent;public class ComboBoxSearch extends ComboBox{private var timer:Timer;private var tempEvent:TextOperationEvent;public function ComboBoxSearch(){super();this.addEventListener(Event.ADDED_TO_STAGE,onAddToStageHandler);this.addEventListener(Event.REMOVED_FROM_STAGE,onRemoveToStageHandler);}private function onAddToStageHandler(event:Event):void{timer = new Timer(300,1);timer.addEventListener(TimerEvent.TIMER,onTimerHandler);}private function onRemoveToStageHandler(event:Event):void{if(timer.running){timer.stop();}timer.removeEventListener(TimerEvent.TIMER,onTimerHandler);timer = null;}override protected function textInput_changeHandler(event:TextOperationEvent):void{tempEvent = event;if(timer.running){timer.stop();}timer.reset();timer.start();}private function onTimerHandler(event1:TimerEvent):void{var operation:FlowOperation = tempEvent.operation;if (operation is DeleteTextOperation || operation is CutOperation){super.mx_internal::changeHighlightedSelection(CUSTOM_SELECTED_ITEM);processInputField();}else{if (openOnInput){if (!isDropDownOpen){openDropDown();addEventListener(DropDownEvent.OPEN, editingOpenHandler);return;} }processInputField();}}private function editingOpenHandler(event:DropDownEvent):void{removeEventListener(DropDownEvent.OPEN, editingOpenHandler);processInputField();}private function processInputField():void{var matchingItems:Vector.<int>;if (!dataProvider || dataProvider.length <= 0)return;if (textInput.text != ""){if (itemMatchingFunction != null)matchingItems = itemMatchingFunction(this, textInput.text);elsematchingItems = findMatchingItems(textInput.text);if (matchingItems.length > 0){super.mx_internal::changeHighlightedSelection(matchingItems[0], true);var typedLength:int = textInput.text.length;var item:Object = dataProvider ? dataProvider.getItemAt(matchingItems[0]) : undefined;if (item){var itemString:String = itemToLabel(item);textInput.selectAll();textInput.insertText(itemString);textInput.selectRange(typedLength, itemString.length);}}else{super.mx_internal::changeHighlightedSelection(CUSTOM_SELECTED_ITEM);}}else{super.mx_internal::changeHighlightedSelection(NO_SELECTION); }}private function findMatchingItems(input:String):Vector.<int>{var startIndex:int;var stopIndex:int;var retVal:int; var retVector:Vector.<int> = new Vector.<int>;retVal = findStringLoop(input, 0, dataProvider.length); if (retVal != -1)retVector.push(retVal);return retVector;}private function findStringLoop(str:String, startIndex:int, stopIndex:int):Number{for (startIndex; startIndex != stopIndex; startIndex++){var itmStr:String = itemToLabel(dataProvider.getItemAt(startIndex));if(itmStr){if(itmStr.toLowerCase().indexOf(str.toLowerCase()) > -1){return startIndex;}}}return 0;}}}?当然，如果你想优化搜索的方法，那么就你只要修改findStringLoop方法即可。
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