How can you change the default ScrollPhysics in flutter?

Question

I need to change the ScrollPhysics for almost every scrollable widget in an app to BouncingScrollPhysics() . I have tried to find a way to do this without adding the physics property everywhere, but I haven't found good a way yet. One solution is to use flutter_platform_widgets and set initialPlatform to iOS, but that will change a lot of other things as well.

Does anyone know if this is possible, and in that case how?

Answer 1

You can copy paste run full code below
You can extend ScrollBehavior and put in builder of MaterialApp
In demo code, iOS, macOS, android will use BouncingScrollPhysics
code snippet

class ScrollBehaviorModified extends ScrollBehavior {
  const ScrollBehaviorModified();
  @override
  ScrollPhysics getScrollPhysics(BuildContext context) {
    switch (getPlatform(context)) {
      case TargetPlatform.iOS:
      case TargetPlatform.macOS:
      case TargetPlatform.android:
        return const BouncingScrollPhysics();
      case TargetPlatform.fuchsia:
      case TargetPlatform.linux:
      case TargetPlatform.windows:
        return const ClampingScrollPhysics();
    }
    return null;
  }
}
...
builder: (context, widget) {
        return ScrollConfiguration(
            behavior: ScrollBehaviorModified(), child: widget);
      },

working demo

full code

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class ScrollBehaviorModified extends ScrollBehavior {
  const ScrollBehaviorModified();
  @override
  ScrollPhysics getScrollPhysics(BuildContext context) {
    switch (getPlatform(context)) {
      case TargetPlatform.iOS:
      case TargetPlatform.macOS:
      case TargetPlatform.android:
        return const BouncingScrollPhysics();
      case TargetPlatform.fuchsia:
      case TargetPlatform.linux:
      case TargetPlatform.windows:
        return const ClampingScrollPhysics();
    }
    return null;
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      builder: (context, widget) {
        return ScrollConfiguration(
            behavior: ScrollBehaviorModified(), child: widget);
      },
      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;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Expanded(
              child: ListView.separated(
                itemBuilder: (BuildContext context, int index) {
                  return Text('Item$index');
                },
                separatorBuilder: (BuildContext context, int index) {
                  return Divider();
                },
                itemCount: 50,
              ),
            ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

Answer 2

simple solution for your particular question is => inside ThemeData

platform: TargetPlatform.iOS,

Snapshot of the Theme code