99 lines
2.8 KiB
Dart
99 lines
2.8 KiB
Dart
import 'package:aves/model/image_entry.dart';
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import 'package:aves/utils/constants.dart';
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import 'package:aves/widgets/common/image_providers/thumbnail_provider.dart';
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import 'package:aves/widgets/common/image_providers/uri_image_provider.dart';
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import 'package:aves/widgets/common/transition_image.dart';
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import 'package:flutter/material.dart';
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class ThumbnailRasterImage extends StatefulWidget {
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final ImageEntry entry;
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final double extent;
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final ValueNotifier<bool> isScrollingNotifier;
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final Object heroTag;
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const ThumbnailRasterImage({
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Key key,
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@required this.entry,
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@required this.extent,
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this.isScrollingNotifier,
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this.heroTag,
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}) : super(key: key);
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@override
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_ThumbnailRasterImageState createState() => _ThumbnailRasterImageState();
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}
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class _ThumbnailRasterImageState extends State<ThumbnailRasterImage> {
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ThumbnailProvider _imageProvider;
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ImageEntry get entry => widget.entry;
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double get extent => widget.extent;
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Object get heroTag => widget.heroTag;
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@override
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void initState() {
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super.initState();
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_initProvider();
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}
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@override
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void didUpdateWidget(ThumbnailRasterImage oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (oldWidget.entry != entry) {
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_pauseProvider();
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_initProvider();
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}
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}
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@override
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void dispose() {
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_pauseProvider();
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super.dispose();
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}
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void _initProvider() => _imageProvider = ThumbnailProvider(entry: entry, extent: Constants.thumbnailCacheExtent);
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void _pauseProvider() {
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final isScrolling = widget.isScrollingNotifier?.value ?? false;
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// when the user is scrolling faster than we can retrieve the thumbnails,
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// the retrieval task queue can pile up for thumbnails that got disposed
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// in this case we pause the image retrieval task to get it out of the queue
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if (isScrolling) {
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_imageProvider?.pause();
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}
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}
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@override
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Widget build(BuildContext context) {
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final image = Image(
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image: _imageProvider,
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width: extent,
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height: extent,
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fit: BoxFit.cover,
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);
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return heroTag == null
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? image
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: Hero(
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tag: heroTag,
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flightShuttleBuilder: (flight, animation, direction, fromHero, toHero) {
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ImageProvider heroImageProvider = _imageProvider;
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if (!entry.isVideo && !entry.isSvg) {
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final imageProvider = UriImage(
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uri: entry.uri,
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mimeType: entry.mimeType,
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);
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if (imageCache.statusForKey(imageProvider).keepAlive) {
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heroImageProvider = imageProvider;
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}
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}
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return TransitionImage(
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image: heroImageProvider,
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animation: animation,
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);
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},
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child: image,
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);
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}
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}
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