我想用顫振繪制黑色容器形狀。

uj5u.com熱心網友回復:
有很多方法可以做到這一點,第一次我以為是剪輯,我在想一個ClipPath小部件,但現在我看到你的黑色頂部有一個圓形小部件Container。
這是一個例子:
class FunnyContainer extends StatelessWidget {
const FunnyContainer({Key? key}) : super(key: key);
Widget _childContainer() {
return Padding(
padding: const EdgeInsets.all(20.0),
child: DecoratedBox(
decoration: BoxDecoration(
color: Colors.white,
border: Border.all(
color: Colors.yellow,
width: 4,
),
borderRadius: const BorderRadius.all(Radius.circular(20)),
),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 20.0, vertical: 40),
child: Container(
height: 400,
decoration: const BoxDecoration(
color: Colors.black,
borderRadius: BorderRadius.all(Radius.circular(20)),
),
child: Stack(
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
const SizedBox(height: 40),
Expanded(child: _childContainer()),
Expanded(child: _childContainer()),
Expanded(child: _childContainer()),
],
),
const Positioned(
left: 0,
right: 0,
top: -50,
child: CircleAvatar(
backgroundColor: Colors.white,
radius: 40,
),
)
],
),
),
),
);
}
}
結果:

更新(使用您更新的設計)
現在您更新了您的帖子,這可以使用 Clippers 完成,問題是剪輯需要 Shadow,所以我使用了以下代碼:
您只需要更新 Path 以獲得Container.
uj5u.com熱心網友回復:
您可以使用Stackwhich 可以在容器頂部寫畫圈,如下所示:
class BlackContainer extends StatelessWidget {
const BlackContainer({
Key? key,
required this.child,
}) : super(key: key);
final Widget child;
@override
Widget build(BuildContext context) {
return Stack(
clipBehavior: Clip.none,
alignment: Alignment.center,
children: [
Container(
child: child,
padding: const EdgeInsets.all(24),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.black,
boxShadow: const [
BoxShadow(
color: Colors.grey,
spreadRadius: 5,
blurRadius: 10,
),
],
),
),
Positioned(
top: -25,
child: Container(
decoration: const BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
),
width: 40,
height: 40,
),
),
],
);
}
}
并像這樣使用它:
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: BlackContainer(
child: Text(
'Content here',
style: Theme.of(context)
.textTheme
.bodyText2!
.copyWith(color: Colors.white),
),
),
),
);
}
}
uj5u.com熱心網友回復:
在容器頂部放置一個透明的 png。
child: Container(
width: 200,
height: 300,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30),
color: Colors.black,
boxShadow: [
BoxShadow(
color: Colors.grey.withOpacity(0.5),
spreadRadius: 5,
blurRadius: 7,
offset: Offset(0, 3),
),
],
),
child: Container(
child: Image.asset('assets/images/half-circle.png', fit: BoxFit.contain, alignment: new Alignment(-1.0, -1.0)),
margin: EdgeInsets.only(left: 50.0, right: 50.0),
),
),
圖片:

活生生的例子
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