崔宝新
ebde2ae977
1. 将ResolveProblemBox从class_update_widgets.dart抽离到公共组件目录 2. 替换静态渐变背景为CDN资源背景图，适配平板和手机端 3. 将点赞评论按钮的图标从内置Icons替换为本地png资源 4. 更新pubspec.yaml添加新的图片资源路径 5. 删除冗余的空行配置
622 lines
18 KiB
Dart
622 lines
18 KiB
Dart
import 'dart:ui' as ui;
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import 'package:cached_network_image/cached_network_image.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_screenutil/flutter_screenutil.dart';
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import 'package:new_learn/core/api/class/model.dart';
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import 'package:new_learn/core/components/image_preview_viewer.dart';
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import 'package:new_learn/core/components/resolve_problem_box.dart';
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import 'package:new_learn/core/components/user_circle_avatar.dart';
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import 'package:new_learn/core/utils/img_url.dart';
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/// ============================================================
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/// 【班级动态组件】由 class_update_view.dart 抽离的展示组件
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///
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/// PostCard（动态卡片，按 type 分发内容 + 相册 + 点赞评论栏）
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/// CardHeader / SubjectTag / AlbumDesc / AlbumGrid / LikeCommentBar / ...
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/// ResolveProblemBox 已抽离到 core/components/resolve_problem_box.dart
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/// LikeCommentBar / MetaButton / CommentPreview / CommentInput
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///
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/// 原为 class_update_view.dart 内的私有组件，重命名去下划线后放到本文件。
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/// 头像复用 core/components/user_circle_avatar.dart。
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/// ============================================================
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/// 动态卡片（对标 SubjectCard + ResolveProblem/文字 + Album + LikeAndComment）
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class PostCard extends StatelessWidget {
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const PostCard({
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super.key,
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required this.post,
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required this.onLike,
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required this.onComment,
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this.showCommentComposer = true,
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this.hasCardBackground = true,
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this.showLikeCommentBar = true,
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});
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final UserPostDto post;
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final VoidCallback onLike;
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final ValueChanged<String> onComment;
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/// 是否显示卡片内嵌的评论预览 + 输入框（列表页 true；详情页由全量留言接管）
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final bool showCommentComposer;
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/// 是否显示白色卡片背景（列表页 true；详情页与留言区共用一张大卡片 → false）
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final bool hasCardBackground;
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/// 是否显示点赞/评论标记栏（列表页 true；详情页不需要 → false）
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final bool showLikeCommentBar;
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String get _avatar {
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final url = ImgUrl.build(post.avatar);
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return url.isEmpty
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? ImgUrl.build('/StaticResource/2026-04-03/fake-avatar.png')
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: url;
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}
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String get _name => post.userName.isEmpty ? '默认姓名' : post.userName;
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String get _subject => post.subjectName.isEmpty ? '数学' : post.subjectName;
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String get _time {
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final t = post.createTime;
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if (t.isEmpty) return '';
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final s = t.replaceFirst('T', ' ').replaceFirst('Z', '');
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return s.length > 16 ? s.substring(0, 16) : s;
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}
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@override
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Widget build(BuildContext context) {
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final card = Stack(
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children: [
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Positioned(
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top: 0,
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left: 0,
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right: 0,
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height: 85.h,
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child: IgnorePointer(
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// 卡片顶部右上角光晕，对标 Vue SubjectCard::before 的双层 radial-gradient
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child: CustomPaint(painter: _CardTopGlowPainter()),
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),
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),
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Padding(
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padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 21.h),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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CardHeader(
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avatar: _avatar,
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name: _name,
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subject: _subject,
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time: _time,
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),
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if (post.type == 1) ...[
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SizedBox(height: 5.h),
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ResolveProblemBox(desc: post.content),
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],
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if (post.type == 2 || post.type == 3) ...[
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SizedBox(height: 15.h),
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AlbumDesc(text: post.content),
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],
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if (post.urls.isNotEmpty) ...[
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SizedBox(height: 15.h),
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AlbumGrid(urls: post.urls.map(ImgUrl.build).toList()),
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],
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SizedBox(height: 10.h),
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if (showLikeCommentBar)
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LikeCommentBar(
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post: post,
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onLike: onLike,
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onComment: onComment,
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showComposer: showCommentComposer,
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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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if (!hasCardBackground) return card;
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return Container(
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margin: EdgeInsets.only(bottom: 10.h),
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clipBehavior: Clip.antiAlias,
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(15.r),
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),
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child: card,
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);
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}
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}
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/// 卡片顶部光晕：对标 Vue `SubjectCard::before` 的两层 radial-gradient
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/// （椭圆均以右上角为圆心，CSS 先写的在上层）：
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/// radial-gradient(120% 85% at 100% 0%,
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/// rgba(206,233,255,1) 0%, rgba(206,233,255,.26) 10%, rgba(255,255,255,0) 58%)
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/// radial-gradient(75% 55% at 100% 0%,
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/// rgba(196,226,255,.88) 0%, rgba(255,255,255,1) 64%)
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class _CardTopGlowPainter extends CustomPainter {
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@override
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void paint(Canvas canvas, Size size) {
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// 先画下层（更小、偏白的光晕），再画上层（更大的浅蓝光晕）
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_paintGlow(
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canvas,
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size,
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rx: size.width * 0.75,
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ry: size.height * 0.55,
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colors: [const Color(0xFFC4E2FF).withValues(alpha: 0.88), Colors.white],
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stops: const [0, 0.64],
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);
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_paintGlow(
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canvas,
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size,
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rx: size.width * 1.20,
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ry: size.height * 0.85,
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colors: [
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const Color(0xFFCEE9FF),
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const Color(0xFFCEE9FF).withValues(alpha: 0.26),
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Colors.white.withValues(alpha: 0.0),
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],
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stops: const [0, 0.10, 0.58],
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);
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}
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/// 用 canvas.scale 把圆形径向渐变拉成 CSS 的椭圆（圆心 = 右上角）
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void _paintGlow(
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Canvas canvas,
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Size size, {
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required double rx,
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required double ry,
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required List<Color> colors,
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required List<double> stops,
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}) {
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canvas.save();
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canvas.translate(size.width, 0);
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canvas.scale(rx, ry);
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final Paint paint = Paint()
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..shader = ui.Gradient.radial(Offset.zero, 1.0, colors, stops);
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canvas.drawRect(const Rect.fromLTWH(-1, 0, 1, 1), paint);
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canvas.restore();
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
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}
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/// 卡片标题：头像 + 姓名 + 学科标签 + 时间
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class CardHeader extends StatelessWidget {
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const CardHeader({
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super.key,
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required this.avatar,
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required this.name,
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required this.subject,
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required this.time,
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});
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final String avatar;
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final String name;
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final String subject;
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final String time;
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@override
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Widget build(BuildContext context) {
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return Row(
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children: [
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UserCircleAvatar(url: avatar, radius: 20.w),
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SizedBox(width: 12.w),
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Expanded(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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Flexible(
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child: Text(
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name,
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overflow: TextOverflow.ellipsis,
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style: const TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.w600,
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color: Color(0xFF1D2B47),
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),
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),
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),
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SizedBox(width: 8.w),
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SubjectTag(subject: subject),
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],
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),
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SizedBox(height: 2.h),
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Text(
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time,
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style: const TextStyle(fontSize: 12, color: Color(0xFF495A7A)),
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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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/// 学科标签（对标 SubjectTag）
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class SubjectTag extends StatelessWidget {
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const SubjectTag({super.key, required this.subject});
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final String subject;
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static const Map<String, _SubjectColor> _map = {
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'数学': _SubjectColor(0xFF3D7DF5, 0xFFE5F0FF),
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'物理': _SubjectColor(0xFFA45CFF, 0xFFF5ECFF),
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'英语': _SubjectColor(0xFFE5A301, 0xFFFFF6E3),
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'化学': _SubjectColor(0xFF2DB985, 0xFFE5FAF3),
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};
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@override
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Widget build(BuildContext context) {
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final t = subject.trim();
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if (t.isEmpty) return const SizedBox.shrink();
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final c = _map[t] ?? const _SubjectColor(0xFF3D7DF5, 0xFFE5F0FF);
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return Container(
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padding: EdgeInsets.symmetric(horizontal: 7.w, vertical: 2.h),
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decoration: BoxDecoration(
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color: Color(c.bg),
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borderRadius: BorderRadius.circular(6.r),
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),
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child: Text(t, style: TextStyle(fontSize: 11, color: Color(c.fg))),
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);
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}
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}
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/// 纯文字笔记（album-desc，最多 2 行）
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class AlbumDesc extends StatelessWidget {
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const AlbumDesc({super.key, required this.text});
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final String text;
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@override
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Widget build(BuildContext context) {
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return Text(
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text,
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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style: const TextStyle(
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fontSize: 15,
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fontWeight: FontWeight.w400,
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color: Color(0xFF495A7A),
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height: 42 / 30,
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),
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);
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}
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}
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/// 九宫格相册（最多展示 9 张，第 9 张叠加 +N）
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class AlbumGrid extends StatelessWidget {
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const AlbumGrid({super.key, required this.urls});
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final List<String> urls;
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@override
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Widget build(BuildContext context) {
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final displayed = urls.take(9).toList();
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return Wrap(
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spacing: 9.w,
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runSpacing: 9.h,
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children: [
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for (int i = 0; i < displayed.length; i++)
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GestureDetector(
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onTap: () => _preview(context, urls, i),
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child: _gridItem(displayed[i], i, urls.length),
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),
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],
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);
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}
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/// 点击相册图：进入整组大图预览，定位到点中的那张
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void _preview(BuildContext context, List<String> allUrls, int index) {
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ImagePreviewViewer.show(
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context,
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items: [
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for (final u in allUrls)
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PreviewImageItem(imageProvider: CachedNetworkImageProvider(u)),
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],
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initialIndex: index,
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);
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}
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Widget _gridItem(String url, int index, int total) {
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final more = total > 9 && index == 8 ? total - 9 : 0;
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return ClipRRect(
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borderRadius: BorderRadius.circular(8.r),
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child: SizedBox(
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width: 99.w,
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height: 99.h,
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child: Stack(
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fit: StackFit.expand,
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children: [
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CachedNetworkImage(
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imageUrl: url,
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fit: BoxFit.cover,
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errorWidget: (_, _, _) =>
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const ColoredBox(color: Color(0xFFF0F2F5)),
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),
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if (more > 0)
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ColoredBox(
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color: const Color(0x66000000),
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child: Center(
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child: Text(
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'+$more',
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style: const TextStyle(
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fontSize: 25,
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fontWeight: FontWeight.bold,
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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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/// 点赞 / 评论栏（对标 LikeAndComment）
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class LikeCommentBar extends StatelessWidget {
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const LikeCommentBar({
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super.key,
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required this.post,
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required this.onLike,
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required this.onComment,
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this.showComposer = true,
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});
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final UserPostDto post;
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final VoidCallback onLike;
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final ValueChanged<String> onComment;
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/// 是否显示评论预览 + 输入框（列表页 true；详情页 false，由全量留言列表接管）
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final bool showComposer;
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@override
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Widget build(BuildContext context) {
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return Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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mainAxisAlignment: MainAxisAlignment.end,
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children: [
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MetaButton(
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icon: Image.asset(
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post.userLikeStatus
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? 'assets/img/class/like-check-icon.png'
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: 'assets/img/class/like-icon.png',
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width: 13.w,
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height: 13.w,
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),
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count: post.likeCount,
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active: post.userLikeStatus,
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onTap: onLike,
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),
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SizedBox(width: 8.w),
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MetaButton(
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icon: Image.asset(
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'assets/img/class/comment-icon.png',
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width: 13.w,
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height: 13.w,
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),
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count: post.replyCount,
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),
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],
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),
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if (showComposer) ...[
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if (post.commons.isNotEmpty) ...[
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SizedBox(height: 12.h),
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CommentPreview(post: post),
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],
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SizedBox(height: 12.h),
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CommentInput(onSubmit: onComment),
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],
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],
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);
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}
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}
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class MetaButton extends StatelessWidget {
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const MetaButton({
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super.key,
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required this.icon,
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required this.count,
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this.active = false,
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this.onTap,
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});
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final Widget icon;
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final int count;
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final bool active;
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final VoidCallback? onTap;
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@override
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Widget build(BuildContext context) {
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final color = active ? const Color(0xFF3D7DF5) : const Color(0xFFB4C2E0);
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return GestureDetector(
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onTap: onTap,
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child: Container(
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width: 51.w,
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height: 22.h,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(20.r),
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border: Border.all(
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color: const Color(0xFFB3C2E0).withValues(alpha: 0.3),
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),
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),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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icon,
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SizedBox(width: 4.w),
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Text('$count', style: TextStyle(fontSize: 13, color: color)),
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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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/// 评论预览框（前 3 条 + 共 N 条）
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class CommentPreview extends StatelessWidget {
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const CommentPreview({super.key, required this.post});
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final UserPostDto post;
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@override
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Widget build(BuildContext context) {
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return Container(
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width: double.infinity,
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padding: EdgeInsets.symmetric(horizontal: 19.w, vertical: 12.h),
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decoration: BoxDecoration(
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color: const Color(0xFFF5F8FA),
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borderRadius: BorderRadius.circular(10.r),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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for (final c in post.commons.take(3))
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Padding(
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padding: EdgeInsets.only(bottom: 8.h),
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child: Text.rich(
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TextSpan(
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children: [
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TextSpan(
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text: '${c.userName}：',
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style: const TextStyle(
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fontSize: 13,
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fontWeight: FontWeight.w800,
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color: Color(0xFF1D2B47),
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),
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),
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TextSpan(
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text: c.content,
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style: const TextStyle(
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fontSize: 13,
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color: Color(0xFF495A7A),
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),
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),
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],
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),
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),
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),
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if (post.replyCount > 3)
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Row(
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children: [
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Text(
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'共${post.replyCount}条评论',
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style: const TextStyle(
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fontSize: 12,
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color: Color(0xFF687FAD),
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),
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),
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const Icon(
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Icons.chevron_right,
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size: 14,
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color: Color(0xFF687FAD),
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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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/// 评论输入行
|
||
class CommentInput extends StatefulWidget {
|
||
const CommentInput({super.key, required this.onSubmit});
|
||
|
||
final ValueChanged<String> onSubmit;
|
||
|
||
@override
|
||
State<CommentInput> createState() => _CommentInputState();
|
||
}
|
||
|
||
class _CommentInputState extends State<CommentInput> {
|
||
final TextEditingController _controller = TextEditingController();
|
||
|
||
@override
|
||
void dispose() {
|
||
_controller.dispose();
|
||
super.dispose();
|
||
}
|
||
|
||
void _send() {
|
||
final text = _controller.text.trim();
|
||
if (text.isEmpty) return;
|
||
widget.onSubmit(text);
|
||
_controller.clear();
|
||
}
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
return Row(
|
||
crossAxisAlignment: CrossAxisAlignment.end,
|
||
children: [
|
||
Expanded(
|
||
child: Container(
|
||
constraints: BoxConstraints(minHeight: 30.h),
|
||
padding: EdgeInsets.symmetric(horizontal: 12.w, vertical: 5.h),
|
||
decoration: BoxDecoration(
|
||
color: Colors.white,
|
||
border: Border.all(color: const Color(0xFFE3ECFF)),
|
||
borderRadius: BorderRadius.circular(10.r),
|
||
),
|
||
// multiline：键盘右下角为「换行」，可换行写多条评论
|
||
child: TextField(
|
||
controller: _controller,
|
||
style: const TextStyle(fontSize: 12, color: Color(0xFF1D2B47)),
|
||
keyboardType: TextInputType.multiline,
|
||
textInputAction: TextInputAction.newline,
|
||
minLines: 1,
|
||
maxLines: 4,
|
||
decoration: const InputDecoration(
|
||
isDense: true,
|
||
border: InputBorder.none,
|
||
hintText: '写下你的评论',
|
||
hintStyle: TextStyle(fontSize: 12, color: Color(0xFFB4C2E0)),
|
||
),
|
||
onSubmitted: (_) => _send(),
|
||
),
|
||
),
|
||
),
|
||
SizedBox(width: 10.w),
|
||
GestureDetector(
|
||
onTap: _send,
|
||
child: Container(
|
||
width: 51.w,
|
||
height: 30.h,
|
||
alignment: Alignment.center,
|
||
decoration: BoxDecoration(
|
||
gradient: const LinearGradient(
|
||
begin: Alignment.topCenter,
|
||
end: Alignment.bottomCenter,
|
||
colors: [
|
||
Color(0xFF8AD1FD),
|
||
Color(0xFF3C84FF),
|
||
Color(0xFF3D7DF5),
|
||
],
|
||
),
|
||
borderRadius: BorderRadius.circular(6.r),
|
||
),
|
||
child: const Text(
|
||
'发送',
|
||
style: TextStyle(fontSize: 13, color: Colors.white),
|
||
),
|
||
),
|
||
),
|
||
],
|
||
);
|
||
}
|
||
}
|
||
|
||
class _SubjectColor {
|
||
const _SubjectColor(this.fg, this.bg);
|
||
final int fg;
|
||
final int bg;
|
||
}
|