ClipRect 矩形裁剪

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "ClipRect矩形裁剪",
      home: Scaffold(
        appBar: AppBar(
          title: Text("ClipRect矩形裁剪"),
        ),
        body: Center(
          child: ClipRect(
            clipper: RectClipper(),
            child: SizedBox(
              width: 300.0,
              height: 300.0,
              child: Image.network(
                "https://start.lidong.me/asset/dong.png",
                fit: BoxFit.cover,
              ),
            ),
          ),
        ),
      ),
    );
  }
}

//自定义 Clipper 类型为 Rect
class RectClipper extends CustomClipper<Rect> {
//  重写获取剪裁范围
  @override
  Rect getClip(Size size) {
    return Rect.fromLTRB(100.0, 100.0, size.width, size.height);
  }

// 重写是否重新裁剪
  @override
  bool shouldReclip(CustomClipper<Rect> oldClipper) {
    return true;
  }
}