feat(mobile): UI-01 theme system, shared components and navigation
Co-Authored-By: Claude Code <noreply@anthropic.com>
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/// 空态(UI-01):图标 + 标题 + 说明 + 可选操作按钮,居中布局。
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///
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/// 用于列表/工作区「暂无内容」的引导(相册为空、队列为空等);标题与
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/// 说明由调用方传入(本地化),操作按钮为次强调(tonal,不与页面主
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/// CTA 争夺层级)。与 ErrorState 的区别:空态是正常状态,无重试语义。
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library;
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import 'package:flutter/material.dart';
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import '../tokens.dart';
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/// 空态视图。
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class EmptyState extends StatelessWidget {
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const EmptyState({
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required this.icon,
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required this.title,
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this.subtitle,
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this.actionLabel,
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this.onAction,
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super.key,
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});
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/// 主题图标(如 [Icons.photo_library_outlined])。
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final IconData icon;
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/// 主文案(如「暂无相册」)。
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final String title;
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/// 补充说明;null 不占位。
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final String? subtitle;
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/// 可选操作按钮文案;null 不显示按钮。
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final String? actionLabel;
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/// 操作回调(与 [actionLabel] 成对提供)。
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final VoidCallback? onAction;
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return Center(
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child: Padding(
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padding: const EdgeInsets.all(kSpace24),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(icon, size: 48, color: theme.colorScheme.onSurfaceVariant),
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const SizedBox(height: kSpace12),
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Text(
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title,
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textAlign: TextAlign.center,
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style: theme.textTheme.titleMedium,
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),
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if (subtitle != null && subtitle!.isNotEmpty) ...[
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const SizedBox(height: kSpace4),
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Text(
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subtitle!,
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textAlign: TextAlign.center,
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style: theme.textTheme.bodySmall?.copyWith(
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color: theme.colorScheme.onSurfaceVariant,
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),
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),
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],
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if (actionLabel != null) ...[
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const SizedBox(height: kSpace16),
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FilledButton.tonal(
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onPressed: onAction,
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child: Text(actionLabel!),
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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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