初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
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+import 'package:flutter/material.dart';
+import 'package:hgdj/assets_tool/images.dart';
+import 'package:hgdj/hj_model/video_model.dart';
+import 'package:hgdj/hj_utils/const.dart';
+import 'package:hgdj/hj_utils/screen.dart';
+import 'package:hgdj/tools_base/video_download/media_download_manager.dart';
+
+/// 视频下载按钮，短视频 / 长视频 / 短剧 / 动漫共用。
+/// 只管画状态和转发点击；权限、扣次、落记录、进度回调全在 [MediaDownloadManager]
+class DownloadButton extends StatefulWidget {
+  final VideoModel? video;
+
+  /// true 竖排(短视频那套图标)，false 横排(长视频)，只影响外观
+  final bool isShort;
+
+  /// 缓存记录落哪个桶。不传时按 [isShort] 推断（短视频 / 影视 / 动漫）；
+  /// 短剧在操作台里排版同短视频，但要单独归类，所以显式传 [MediaStyle.Drama]
+  final MediaStyle? style;
+
+  const DownloadButton(
+      {super.key, this.video, this.isShort = true, this.style});
+
+  @override
+  State<DownloadButton> createState() => _DownloadButtonState();
+}
+
+class _DownloadButtonState extends State<DownloadButton> {
+  late DownloadTask _task;
+
+  /// 免费下载一套图标，短视频/长视频各一套
+  String get _icon => (widget.video?.isFreeDownload == true
+          ? "download_free.png"
+          : widget.isShort
+              ? "download_short.png"
+              : "download.png")
+      .videoPath;
+
+  /// 保存到缓存库时的媒体类型
+  MediaStyle get _mediaStyle {
+    final style = widget.style;
+    if (style != null) return style;
+    if (widget.isShort) return MediaStyle.ShortVideo;
+    return widget.video?.videoType == 1 ? MediaStyle.Cartoon : MediaStyle.Video;
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _task = MediaDownloadManager.instance
+        .attach(video: widget.video, style: _mediaStyle, onChanged: _refresh);
+  }
+
+  @override
+  void didUpdateWidget(covariant DownloadButton oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    //列表/PageView 复用 State 时会换 model，会话得跟着换：不换的话按钮画的是上一条的状态，
+    //点下载下的也是上一条。同一个对象(父级只是重建)就别白折腾
+    if (identical(oldWidget.video, widget.video)) return;
+    _task.detach();
+    _task = MediaDownloadManager.instance
+        .attach(video: widget.video, style: _mediaStyle, onChanged: _refresh);
+  }
+
+  @override
+  void dispose() {
+    _task.detach();
+    super.dispose();
+  }
+
+  /// 本按钮在短视频列表里随滑动大量创建/销毁，下载回调由单例持有、dispose 后仍可能被调到，统一判 mounted
+  void _refresh() {
+    if (mounted) setState(() {});
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final isShort = widget.isShort;
+    final icon = SizedBox(
+      width: isShort ? 30 : 24,
+      height: isShort ? 30 : 24,
+      child: Image.asset(_icon),
+    );
+    final label = Text(
+      _task.state.desc,
+      style: isShort
+          ? const TextStyle(
+              color: Color(0xffdcdcdc),
+              fontSize: 12,
+              fontWeight: FontWeight.w500)
+          : const TextStyle(color: Color(0xff989898), fontSize: 12),
+    );
+    return InkWell(
+      enableFeedback: false,
+      onTap: _task.start,
+      child: isShort
+          ? Column(mainAxisSize: MainAxisSize.min, children: [icon, label])
+          : Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [icon, 2.sizeBoxW, label]),
+    );
+  }
+}