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Handling gestures in Flutter

This Article is posted by seven.srikanth@gmail.com at 06-12-2018 02:57:16



In this article, I'm going to share you an example of how to handle gestures in Flutter.
This is how the final output is going to look. 
    
In this below example you handle onTap, onDoubleTap and onLongPress gestures. Check out https://docs.flutter.io/flutter/widgets/GestureDetector-class.html for more properties. 
Here is the full code from main.dart file. You just need to create a flutter program and replace the code in main.dart file with below code.
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: "Gestures Demo",
home: MyApp(),
));
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
var _action = "Waiting for an action";
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Gestures Demo"),
),
body: Center(
child: Column(
children: <Widget>[
Padding(
padding: EdgeInsets.all(50.0),
),
Text(
"$_action",
),
GestureDetector(
onTap: () {
setState(() {
_action = "Tapped";
});
},
onDoubleTap: () {
setState(() {
_action = "Double Tapped";
});
},
onLongPress: () {
setState(() {
_action = "Log Pressed";
});
},
child: Container(
height: 40.0,
padding: EdgeInsets.all(10.0),
margin: EdgeInsets.symmetric(vertical: 28.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5.0),
color: Colors.lightGreen,
),
child: Text("Do something here"),
),
),
],
)),
);
}
}
Hope this is helpful. 
Thanks,
Srikanth

Tags: Handling gestures in Flutter; handle onTap, onDoubleTap and onLongPress gestures in flutter;




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