flutter-template/lib/core/widgets/app_button.dart

import 'package:flutter/material.dart';

/// 带 loading 状态的通用 FilledButton。
class AppButton extends StatelessWidget {
  const AppButton({
    super.key,
    required this.label,
    required this.onPressed,
    this.loading = false,
    this.width = double.infinity,
    this.height = 50.0,
  });

  final String label;
  final VoidCallback? onPressed;
  final bool loading;
  final double width;
  final double height;

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: width,
      height: height,
      child: FilledButton(
        onPressed: loading ? null : onPressed,
        child: loading
            ? const SizedBox(
                width: 20,
                height: 20,
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  color: Colors.white,
                ),
              )
            : Text(label),
      ),
    );
  }
}

/// 带 loading 状态的通用 OutlinedButton。
class AppOutlinedButton extends StatelessWidget {
  const AppOutlinedButton({
    super.key,
    required this.label,
    required this.onPressed,
    this.loading = false,
    this.width = double.infinity,
    this.height = 50.0,
  });

  final String label;
  final VoidCallback? onPressed;
  final bool loading;
  final double width;
  final double height;

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      width: width,
      height: height,
      child: OutlinedButton(
        onPressed: loading ? null : onPressed,
        child: loading
            ? SizedBox(
                width: 20,
                height: 20,
                child: CircularProgressIndicator(
                  strokeWidth: 2,
                  color: Theme.of(context).colorScheme.primary,
                ),
              )
            : Text(label),
      ),
    );
  }
}