In flutter i have a challenge that i want to have a simple Listview
with some items which each item have a image and text on bottom of that, you suppose we have Instagram
card,
as we know, when we have a vertical ListView
we can scroll that top or bottom, scrolling the listview can be happen on each item of the listview.
now on each item of this listview i want to swipe top like with scrolling top, instead of scrolling the listview to top i want to show another widget on this item
my question is how can i avoid scrolling the listview during we swipe on image into card
You can wrap your image widget with GestureDetector
and use this method to disable the scroll behavior when users tap down on the image widget.
A convenient behavior I found with this method is users can still scroll up or down if they want to (tap down and swipe IMMEDIATELY instead of tap down THEN swipe). This may not be the best way because I can't only block the scroll-up behavior.
This is my example:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
final String title;
const MyHomePage({
Key? key,
required this.title,
}) : super(key: key);
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
ScrollPhysics physics = const AlwaysScrollableScrollPhysics();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: ListView(
// Add the scroll physics controller here
physics: physics,
children: [
for (int i = 0; i < 20; i++) ...[
// Wrap the Widget with GestureDetector
GestureDetector(
// Disable the scroll behavior when users tap down
onTapDown: (_) {
setState(() {
physics = const NeverScrollableScrollPhysics();
});
},
// Enable the scroll behavior when user leave
onTapCancel: () {
setState(() {
physics = const AlwaysScrollableScrollPhysics();
});
},
onPanUpdate: (details) {
// Catch the swipe up action.
if (details.delta.dy < 0) {
print('Swiping up the element $i');
}
// Catch the swipe down action.
if (details.delta.dy > 0) {
print('Swiping down the element $i');
}
},
// Your image widget here
child: Padding(
padding: const EdgeInsets.all(20),
child: Container(
width: 100,
height: 100,
color: Colors.red,
),
),
),
Center(child: Text('Element $i')),
],
],
),
);
}
}
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