98 lines
2.6 KiB
Dart
98 lines
2.6 KiB
Dart
// Author: fruit.com.cn
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import 'dart:async';
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import 'package:flutter/material.dart';
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import '../../../core/data/services/sprite_thumbnail_axis.dart';
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import '../../../core/theme/app_colors.dart';
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import 'scrub_preview_card.dart';
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/// 当前集雪碧图首帧在视频纹理未就绪时占位；空地址交还纯黑底。
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Widget? playerOpeningFrame(
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String? thumbnailsUrl, {
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required SpriteThumbnailAxisSource spriteSource,
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BoxFit fit = BoxFit.cover,
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}) {
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final url = thumbnailsUrl?.trim() ?? '';
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if (url.isEmpty) return null;
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return PlayerOpeningFrame(
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thumbnailsUrl: url,
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spriteSource: spriteSource,
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fit: fit,
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);
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}
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/// 与视频共用全屏父约束和 BoxFit，切换时保持相同可见区域。
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class PlayerOpeningFrame extends StatefulWidget {
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const PlayerOpeningFrame({
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super.key,
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required this.thumbnailsUrl,
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required this.spriteSource,
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this.fit = BoxFit.cover,
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});
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/// 当前视频雪碧图 WebVTT 地址。
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final String thumbnailsUrl;
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/// 进度条拖动预览共用的雪碧图时间轴与解码缓存。
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final SpriteThumbnailAxisSource spriteSource;
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/// 必须与同页视频层使用相同适配规则。
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final BoxFit fit;
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@override
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State<PlayerOpeningFrame> createState() => _PlayerOpeningFrameState();
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}
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class _PlayerOpeningFrameState extends State<PlayerOpeningFrame> {
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@override
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void initState() {
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super.initState();
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widget.spriteSource.addListener(_handleSpriteChanged);
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unawaited(
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widget.spriteSource.prepareAt(widget.thumbnailsUrl, Duration.zero),
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);
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}
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@override
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void didUpdateWidget(covariant PlayerOpeningFrame oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.spriteSource != widget.spriteSource) {
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oldWidget.spriteSource.removeListener(_handleSpriteChanged);
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widget.spriteSource.addListener(_handleSpriteChanged);
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}
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if (oldWidget.thumbnailsUrl != widget.thumbnailsUrl) {
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unawaited(
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widget.spriteSource.prepareAt(widget.thumbnailsUrl, Duration.zero),
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);
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}
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}
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@override
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void dispose() {
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widget.spriteSource.removeListener(_handleSpriteChanged);
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super.dispose();
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}
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void _handleSpriteChanged() {
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if (mounted) setState(() {});
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}
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@override
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Widget build(BuildContext context) => Stack(
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fit: StackFit.expand,
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children: [
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const ColoredBox(color: AppColors.mediaBlack),
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if (widget.spriteSource.cachedFrameAt(widget.thumbnailsUrl, Duration.zero)
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case final frame?)
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SpriteCropPreview(
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key: const Key('player-opening-sprite'),
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image: frame.image,
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sourceRect: frame.sourceRect,
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fit: widget.fit,
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),
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],
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);
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}
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