VitalApp/lib/components/button.dart

import 'package:flutter/material.dart';

enum VButtonType {
  primary,
  error,
  cancel,
  text,
}

class VButton extends StatelessWidget {
  /// 类型
  final VButtonType type;

  /// 文字
  final String? label;

  /// 自定义子组件
  final Widget? child;

  /// 点击事件回调
  final VoidCallback? onTap;

  const VButton({
    super.key,
    this.type = VButtonType.primary,
    this.label,
    this.child,
    this.onTap,
  }) : assert(label != null || child != null);

  @override
  Widget build(BuildContext context) {
    final colors = _findBgColor(context, type);
    final bgColor = colors.$1;
    final textColor = colors.$2;
    return SizedBox(
      width: 270,
      height: 60,
      child: ElevatedButton(
        onPressed: () {
          onTap?.call();
        },
        style: ButtonStyle(
          foregroundColor: MaterialStatePropertyAll(textColor),
          backgroundColor: MaterialStatePropertyAll(bgColor),
          elevation: const MaterialStatePropertyAll(0),
          padding: const MaterialStatePropertyAll(
            EdgeInsets.symmetric(horizontal: 14, vertical: 8),
          ),
          alignment: Alignment.center,
          shape: MaterialStatePropertyAll(
            RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
          ),
        ),
        child: child ??
            Text(
              label!,
              style: TextStyle(
                color: textColor,
                fontSize: 18,
              ),
            ),
      ),
    );
  }

  (Color c, Color b) _findBgColor(BuildContext context, VButtonType type) {
    switch (type) {
      case VButtonType.primary:
        return (Theme.of(context).primaryColor, Colors.white);
      case VButtonType.error:
        return (Theme.of(context).colorScheme.error, Colors.white);
      case VButtonType.text:
        return (Colors.white, Theme.of(context).primaryColor);
      case VButtonType.cancel:
        return (Colors.grey, Colors.white);
    }
  }
}