import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_svg/svg.dart';
import 'package:sy_project/config/app_colors.dart';
import 'package:sy_project/core/assets.dart';/// 搜索textview
class CustomSearchBarInput extends StatefulWidget {// 回调函数final Function(String) onSubmitted;final String hintLabel;const CustomSearchBarInput({required this.hintLabel, required this.onSubmitted, super.key});@overrideState<CustomSearchBarInput> createState() => _CustomSearchBarInputState();
}class _CustomSearchBarInputState extends State<CustomSearchBarInput> {// 焦点对象// FocusNode _focusNode = FocusNode();// 文本的值String searchVal = '';//用于清空输入框TextEditingController _controller = TextEditingController();@overridevoid initState() {super.initState();//  获取焦点// WidgetsBinding.instance.addPostFrameCallback((timeStamp) {//   _focusNode.requestFocus();// });}@overrideWidget build(BuildContext context) {return Container(// color: AppColors.baseColor,// margin: EdgeInsets.all(ScreenHelper.pageHorizontalPadding()),height: 35.h,alignment: Alignment.centerLeft,decoration: BoxDecoration(color: Colors.white,borderRadius: BorderRadius.circular(20.h),),child: TextField(textInputAction: TextInputAction.search,controller: _controller,textAlignVertical: TextAlignVertical.center,// //自动获取焦点// focusNode: _focusNode,autofocus: false,onTapOutside: (event){FocusScopeNode currentFocus = FocusScope.of(context);currentFocus.focusedChild?.unfocus();},decoration: InputDecoration(// contentPadding和border的设置是为了让TextField内容实现上下居中contentPadding: const EdgeInsets.all(0),hintText: widget.hintLabel,hintStyle: const TextStyle(color: AppColors.customColor_999),//取消下划线border: const OutlineInputBorder(borderSide: BorderSide.none),icon: Padding(padding: EdgeInsets.only(left: 10.w, right: 0),child: SvgPicture.asset(Assets.images.iconSearch,width: 12.w,height: 12.w,),),// icon: Padding(//     padding: const EdgeInsets.only(left: 0, top: 0),//     child: Icon(//       Icons.search,//       size: 18,//       color: Theme.of(context).primaryColor,//     )),//  关闭按钮，有值时才显示suffixIcon: searchVal.isNotEmpty? IconButton(icon: Icon(Icons.close,size: 15.w,),onPressed: () {//   清空内容setState(() {searchVal = '';_controller.clear();});},): null),onChanged: (value) {setState(() {searchVal = value;// 防止抖动  搜索// VibrationThrottlingUtil.debounce(//     () => widget.onSubmitted(value), 1000);});},onSubmitted: (value) {widget.onSubmitted(value);},),);}
}

防抖就是防止抖动，避免事件的重复触发。
如果某一事件被连续快速地触发多次，只会执行最后那一次。适合输入框输入后自动搜索回调

class VibrationThrottlingUtil {static Timer? _debounceTimer;/// 防抖 (传入所要防抖的方法/回调与延迟时间)static void debounce(Function func, [int delay = 500]) {if (_debounceTimer != null) {_debounceTimer?.cancel();}_debounceTimer = Timer(Duration(milliseconds: delay), () {func.call();_debounceTimer = null;});}