flutter - 如何在颤动中剪辑定位小部件的角

Question

这是我得到的输出：

我想用灰色 Container 的圆角将绿色的 Positioned 小部件夹在角落上。任何帮助将不胜感激。

我当前的代码：

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: CustomCard(
          title: 'Custom Card', percentage: 50.0, color: Colors.green),
    );
  }
}

class CustomCard extends StatelessWidget {
  final String title;
  final double percentage;
  final Color color;
  CustomCard(
      {required this.title, required this.percentage, required this.color});
  @override
  Widget build(BuildContext context) {
    double width = MediaQuery.of(context).size.width;
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Stack(clipBehavior: Clip.antiAliasWithSaveLayer, children: [
          Container(
            height: 100.0,
            width: width,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(10),
              color: Colors.grey,
            ),
          ),
          Positioned(
            left: -(percentage / 100) * width,
            top: -(percentage / 100) * width,
            child: Container(
              height: (percentage / 100) * width * 2,
              width: (percentage / 100) * width * 2,
              decoration: BoxDecoration(
                borderRadius:
                    BorderRadius.circular(((percentage / 100) * width)),
                color: color,
              ),
            ),
          ),
        ]),
      ),
    );
  }
}

谢谢你。

标签： flutterflutter-layoutflutter-positioned

Answer 1

您可以使用 ClipRRect 来实现，检查代码

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: CustomCard(
          title: 'Custom Card', percentage: 50.0, color: Colors.green),
    );
  }
}

class CustomCard extends StatelessWidget {
  final String title;
  final double percentage;
  final Color color;
  CustomCard(
      {required this.title, required this.percentage, required this.color});
  
  Widget positionedWidget(double width){
   return Stack(clipBehavior: Clip.antiAliasWithSaveLayer, children: [
          Container(
            height: 100.0,
            width: width,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(10),
              color: Colors.grey,
            ),
          ),
          Positioned(
            left: -(percentage / 100) * width,
            top: -(percentage / 100) * width,
            child: Container(
              height: (percentage / 100) * width * 2,
              width: (percentage / 100) * width * 2,
              decoration: BoxDecoration(
               
                color: color,
              ),
            ),
          ),
        ]
      );
    
  }
  @override
  Widget build(BuildContext context) {
    double width = MediaQuery.of(context).size.width;
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Padding(padding: EdgeInsets.all(10), child: ClipRRect(borderRadius:  BorderRadius.circular(30),
      child: positionedWidget(width))));
  }
}