有时候需要防止用户误点击按钮,特别是用flutter web做前端, 和后端交互的时候.
通过对点击按钮事件的时间间隔做控制,来实现对按钮点击的控制.
方法定义
var lastPopTime = DateTime.now();
void intervalClick(int needTime){
// 防重复提交
if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
print(lastPopTime);
lastPopTime = DateTime.now();
print("允许点击");
}else{
// lastPopTime = DateTime.now(); //如果不注释这行,则强制用户一定要间隔2s后才能成功点击. 而不是以上一次点击成功的时间开始计算.
print("请勿重复点击！");
}
}
调用
floatingActionButton: FloatingActionButton(
onPressed:(){
intervalClick(2);
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
完整demo代码
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
var lastPopTime = DateTime.now();
void intervalClick(int needTime){
// 防重复提交
if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
print(lastPopTime);
lastPopTime = DateTime.now();
print("允许点击");
}else{
// lastPopTime = DateTime.now(); //如果不注释这行,则强制用户一定要间隔2s后才能成功点击. 而不是以上一次点击成功的时间开始计算.
print("请勿重复点击！");
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed:(){
intervalClick(2);
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
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