[英]How can you change the default ScrollPhysics in flutter?
我需要将应用程序中几乎每个可滚动小部件的ScrollPhysics
更改为BouncingScrollPhysics()
。 我试图找到一种方法来做到这一点,而无需在任何地方添加physics
属性,但我还没有找到好的方法。 一种解决方案是使用flutter_platform_widgets并将initialPlatform
设置为 iOS,但这也会改变很多其他事情。
有谁知道这是否可能,在那种情况下如何?
您可以在下面复制粘贴运行完整代码
您可以扩展ScrollBehavior
并放入MaterialApp
的builder
在演示代码中, iOS, macOS, android
将使用BouncingScrollPhysics
代码片段
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);
},
工作演示
完整代码
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),
),
);
}
}
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