142 lines
4.1 KiB
Dart
142 lines
4.1 KiB
Dart
import 'package:flutter/material.dart';
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import '../theme/app_colors.dart';
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import '../theme/product_theme.dart';
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class GradientButton extends StatelessWidget {
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final String text;
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final VoidCallback? onPressed;
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final double width;
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final double height;
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final bool isLoading;
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final Gradient? gradient;
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final List<BoxShadow>? shadows;
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const GradientButton({
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super.key,
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required this.text,
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this.onPressed,
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this.width = double.infinity,
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this.height = 48.0, // 统一规范高度
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this.isLoading = false,
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this.gradient,
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this.shadows,
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});
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/// 从 ProductThemeData 创建，自动匹配渐变和阴影
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factory GradientButton.fromTheme({
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Key? key,
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required String text,
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required ProductThemeData theme,
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VoidCallback? onPressed,
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double width = double.infinity,
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double height = 48.0,
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bool isLoading = false,
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}) {
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return GradientButton(
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key: key,
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text: text,
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onPressed: onPressed,
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width: width,
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height: height,
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isLoading: isLoading,
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gradient: theme.buttonGradient,
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shadows: theme.buttonShadows,
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);
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}
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List<BoxShadow> get _boxShadows {
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if (shadows != null) return shadows!;
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// 根据渐变颜色自动推断阴影
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if (gradient is LinearGradient) {
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final lg = gradient as LinearGradient;
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if (lg.colors.length >= 2) {
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final shadowColor = lg.colors[lg.colors.length ~/ 2];
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return [
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BoxShadow(
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color: shadowColor.withOpacity(0.4),
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offset: const Offset(0, 4),
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blurRadius: 20,
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),
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BoxShadow(
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color: lg.colors.last.withOpacity(0.2),
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offset: Offset.zero,
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blurRadius: 40,
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),
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];
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}
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}
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return AppColors.shadowPrimaryButton;
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}
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@override
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Widget build(BuildContext context) {
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final bool isDisabled = onPressed == null || isLoading;
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return Opacity(
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opacity: isDisabled ? 0.7 : 1.0,
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child: Container(
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width: width,
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height: height,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(height / 2),
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gradient: gradient ?? AppColors.btnPrimaryGradient,
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boxShadow: _boxShadows,
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),
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child: Stack(
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children: [
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// Shine overlay (top half gradient)
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Positioned.fill(
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child: ClipRRect(
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borderRadius: BorderRadius.circular(height / 2),
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child: DecoratedBox(
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decoration: BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.white.withOpacity(0.15),
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Colors.transparent,
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],
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stops: const [0.0, 0.5],
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),
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),
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),
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),
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),
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// Button content
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Material(
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color: Colors.transparent,
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elevation: 0,
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child: InkWell(
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onTap: isDisabled ? null : onPressed,
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borderRadius: BorderRadius.circular(height / 2),
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splashColor: Colors.white.withOpacity(0.2),
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highlightColor: Colors.white.withOpacity(0.1),
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child: Center(
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child: isLoading
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? const SizedBox(
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width: 24,
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height: 24,
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child: CircularProgressIndicator(
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color: Colors.white,
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strokeWidth: 2.5,
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),
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)
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: Text(
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text,
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style: TextStyle(fontFamily: 'DM Sans',
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fontSize: 17,
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fontWeight: FontWeight.w600,
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color: Colors.white,
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),
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),
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),
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),
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),
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],
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),
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),
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);
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}
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}
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