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README.md
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README.md
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<!--
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This README describes the package. If you publish this package to pub.dev,
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this README's contents appear on the landing page for your package.
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# yx_async_throttle_flutter
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For information about how to write a good package README, see the guide for
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[writing package pages](https://dart.dev/tools/pub/writing-package-pages).
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一个健壮的 Flutter 异步任务防抖(Debounce)与节流(Throttle)工具类。
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For general information about developing packages, see the Dart guide for
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[creating packages](https://dart.dev/guides/libraries/create-packages)
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and the Flutter guide for
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[developing packages and plugins](https://flutter.dev/to/develop-packages).
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-->
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它完美结合了 **时间策略**(Throttle/Debounce)与 **异步任务锁**(Async Task Locking),旨在解决复杂场景下(如弱网环境或用户快速连点)的重复执行问题。
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TODO: Put a short description of the package here that helps potential users
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know whether this package might be useful for them.
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## 功能特性
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## Features
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- **双重保护机制**:
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- **时间策略**: 防止短时间内快速重复点击(基于 easy_debounce)。
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- **异步锁**: 即使时间间隔已过,如果上一个异步任务(如网络请求)尚未完成,也会阻止新任务执行。
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- **节流模式 (Throttle - 默认)**: 立即执行,并在指定时间内忽略后续调用。非常适合“提交”、“登录”等按钮。
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- **防抖模式 (Debounce)**: 延迟执行,直到停止调用一段时间后才执行。非常适合“搜索框”、“实时输入校验”。
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- **内存安全**: 在防抖模式下正确管理 `Completer`,防止因任务被取消导致的 `await` 永久挂起和内存泄漏。
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- **简单易用**: 单例调用,API 简洁。
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TODO: List what your package can do. Maybe include images, gifs, or videos.
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## 快速开始 (Getting Started)
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## Getting started
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在你的 `pubspec.yaml` 文件中添加依赖:
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TODO: List prerequisites and provide or point to information on how to
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start using the package.
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## Usage
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TODO: Include short and useful examples for package users. Add longer examples
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to `/example` folder.
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```dart
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const like = 'sample';
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```yaml
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dependencies:
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yx_app_upgrade_flutter:
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git:
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url: https://gitea.23544.com/wangyang/yx_async_throttle_flutter.git
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ref: 1.0.0
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```
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## Additional information
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## 使用指南 (Usage)
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TODO: Tell users more about the package: where to find more information, how to
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contribute to the package, how to file issues, what response they can expect
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from the package authors, and more.
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### 1. 基础节流 (按钮防暴力点击)
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适用于“提交订单”、“登录”、“保存”等场景。
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即使网络很慢(请求耗时 > 500ms),或者用户手速很快,该函数也能确保在上一个请求完成**且**时间间隔满足之前,不会重复执行。
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```dart
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import 'package:yx_async_throttle_flutter/async_throttle.dart';
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void onSubmit() async {
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// 使用唯一的 tagId 标识这个动作
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await AsyncThrottle.instance.execute(
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'submit_order_btn',
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() async {
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// 你的异步逻辑(例如 API 调用)
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print('正在提交订单...');
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await Future.delayed(Duration(seconds: 2)); // 模拟耗时网络请求
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print('订单提交完成!');
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},
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duration: Duration(milliseconds: 500), // 默认 300ms
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enableDebounce: false, // 默认 false (节流模式)
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);
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}
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```
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### 2. 防抖模式 (搜索或输入)
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适用于搜索框、实时输入联想等场景。只有当用户停止输入指定时间后,才会触发逻辑。
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```dart
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import 'package:yx_async_throttle_flutter/async_throttle.dart';
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void onSearchChanged(String query) async {
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await AsyncThrottle.instance.execute(
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'search_input',
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() async {
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// 只有当用户停止输入 500ms 后才会执行
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print('搜索内容: $query');
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await fetchSearchResults(query);
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},
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duration: Duration(milliseconds: 500),
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enableDebounce: true, // 启用防抖模式
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);
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}
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```
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### 3. 清除锁 (可选)
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在极少数情况下(例如用户退出登录时),你可能需要强制清除所有内部锁。
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```dart
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AsyncThrottle.instance.clearAllLocks();
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```
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## 核心优势:为什么需要异步锁?
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普通的 `Throttle` 库通常只根据 **时间** 来控制执行。
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**典型 Bug 场景:**
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设定节流时间为 `500ms`。
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1. 用户点击“提交”。请求发出,但网络很慢,耗时 `2000ms`。
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2. 在 `600ms` 时(此时节流时间已过),用户因焦急再次点击“提交”。
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3. **问题**: 普通 Throttle 库会认为 500ms 已到,允许执行第二次请求,导致 **重复下单**。
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**本库的解决方案:**
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`yx_async_throttle_flutter` 会检查 `isExecuting` 状态。虽然时间已过,但因为第一个请求(2000ms)还在运行,第二次点击会被直接拦截,从而完美防止重复提交。
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> **💡 最佳实践**: 如果在 `onExecute` 函数内部再添加 **Loading 蒙层**(UI 阻断),配合本插件即可实现 **“三层防护”**(UI 蒙层 + 时间策略 + 异步锁),彻底杜绝任何异常场景下的重复操作。
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## 其他信息
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本库底层的时间策略依赖于 [easy_debounce](https://pub.dev/packages/easy_debounce)。
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