sinoMedCloud/lib/shared/widgets/loading_view.dart

import 'package:flutter/material.dart';

/// 加载状态视图组件
class LoadingView extends StatelessWidget {
  final String? message;
  final Color? color;
  final double? size;

  const LoadingView({
    super.key,
    this.message,
    this.color,
    this.size,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          SizedBox(
            width: size ?? 40,
            height: size ?? 40,
            child: CircularProgressIndicator(
              strokeWidth: 3,
              valueColor: AlwaysStoppedAnimation<Color>(
                color ?? Theme.of(context).colorScheme.primary,
              ),
            ),
          ),
          
          if (message != null) ...[
            const SizedBox(height: 16),
            Text(
              message!,
              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                color: Theme.of(context).colorScheme.onSurface.withOpacity(0.6),
              ),
            ),
          ],
        ],
      ),
    );
  }
}

/// 全屏加载遮罩
class LoadingOverlay extends StatelessWidget {
  final bool isLoading;
  final Widget child;
  final String? message;
  final Color? backgroundColor;

  const LoadingOverlay({
    super.key,
    required this.isLoading,
    required this.child,
    this.message,
    this.backgroundColor,
  });

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        child,
        if (isLoading)
          Container(
            color: backgroundColor ?? Colors.black.withOpacity(0.3),
            child: LoadingView(message: message),
          ),
      ],
    );
  }
}