112 lines
3.5 KiB
Dart
112 lines
3.5 KiB
Dart
import 'dart:math';
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import 'dart:typed_data';
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import 'package:aves/model/image_fetcher.dart';
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import 'package:aves/model/mime_types.dart';
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import 'package:flutter/material.dart';
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import 'package:transparent_image/transparent_image.dart';
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class Thumbnail extends StatefulWidget {
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final Map entry;
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final double extent;
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final double devicePixelRatio;
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const Thumbnail({
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Key key,
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@required this.entry,
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@required this.extent,
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@required this.devicePixelRatio,
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}) : super(key: key);
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@override
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ThumbnailState createState() => ThumbnailState();
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}
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class ThumbnailState extends State<Thumbnail> {
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Future<Uint8List> _byteLoader;
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String get mimeType => widget.entry['mimeType'];
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String get uri => widget.entry['uri'];
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@override
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void initState() {
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super.initState();
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// debugPrint('initState with uri=$uri entry=${widget.entry['path']}');
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initByteLoader();
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}
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@override
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void didUpdateWidget(Thumbnail oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (uri == oldWidget.entry['uri'] && widget.extent == oldWidget.extent) return;
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// debugPrint('didUpdateWidget FROM uri=${oldWidget.entry['uri']} TO uri=$uri entry=${widget.entry['path']}');
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initByteLoader();
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}
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initByteLoader() {
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var dim = (widget.extent * widget.devicePixelRatio).round();
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_byteLoader = ImageFetcher.getImageBytes(widget.entry, dim, dim);
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}
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@override
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void dispose() {
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// debugPrint('dispose with uri=$uri entry=${widget.entry['path']}');
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ImageFetcher.cancelGetImageBytes(uri);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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var isVideo = mimeType.startsWith(MimeTypes.MIME_VIDEO);
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var isGif = mimeType == MimeTypes.MIME_GIF;
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var iconSize = widget.extent / 4;
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return Container(
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decoration: BoxDecoration(
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border: Border.all(
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color: Colors.grey.shade700,
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width: 0.5,
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),
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),
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child: FutureBuilder(
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future: _byteLoader,
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builder: (futureContext, AsyncSnapshot<Uint8List> snapshot) {
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var bytes = (snapshot.connectionState == ConnectionState.done && !snapshot.hasError) ? snapshot.data : kTransparentImage;
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return Stack(
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alignment: AlignmentDirectional.bottomStart,
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children: [
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Hero(
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tag: uri,
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child: LayoutBuilder(builder: (context, constraints) {
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// during hero animation back from a fullscreen image,
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// the image covers the whole screen (because of the 'fit' prop and the full screen hero constraints)
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// so we wrap the image to apply better constraints
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var dim = min(constraints.maxWidth, constraints.maxHeight);
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return Container(
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alignment: Alignment.center,
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constraints: BoxConstraints.tight(Size(dim, dim)),
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child: Image.memory(
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bytes,
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width: dim,
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height: dim,
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fit: BoxFit.cover,
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),
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);
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}),
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),
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if (isVideo)
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Icon(
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Icons.play_circle_outline,
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size: iconSize,
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),
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if (isGif)
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Icon(
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Icons.gif,
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size: iconSize,
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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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