pangolin/client/lib/widgets/page_body.dart

// page_body.dart — 桌面内容页统一宽度容器(镜像 design/prototype/atoms.css 的 .view-body)。
// 默认 600 居中;wide=true 840(多列网格页,如购买页)。手机屏宽 < 600 时约束自然不生效,可无条件包。
import 'package:flutter/widgets.dart';

const double kViewMaxW = 600; // atoms.css .view-body
const double kViewMaxWWide = 840; // atoms.css .view-body.is-wide

class PageBody extends StatelessWidget {
  const PageBody({super.key, required this.child, this.wide = false});
  final Widget child;
  final bool wide;
  @override
  Widget build(BuildContext context) => Center(
        child: ConstrainedBox(
          constraints:
              BoxConstraints(maxWidth: wide ? kViewMaxWWide : kViewMaxW),
          child: child,
        ),
      );
}