87 lines
2.4 KiB
Dart
87 lines
2.4 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:photos/core/thumbnail_cache.dart';
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import 'package:photos/models/photo.dart';
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import 'package:photos/core/constants.dart';
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class ThumbnailWidget extends StatefulWidget {
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final Photo photo;
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const ThumbnailWidget(
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this.photo, {
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Key key,
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}) : super(key: key);
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@override
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_ThumbnailWidgetState createState() => _ThumbnailWidgetState();
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}
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class _ThumbnailWidgetState extends State<ThumbnailWidget> {
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static final Widget loadingWidget = Container(
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alignment: Alignment.center,
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color: Colors.grey[500],
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);
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bool _hasLoadedThumbnail = false;
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ImageProvider _imageProvider;
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@override
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Widget build(BuildContext context) {
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if (!_hasLoadedThumbnail) {
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final cachedSmallThumbnail =
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ThumbnailLruCache.get(widget.photo, THUMBNAIL_SMALL_SIZE);
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if (cachedSmallThumbnail != null) {
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final imageProvider = Image.memory(cachedSmallThumbnail).image;
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precacheImage(imageProvider, context).then((value) {
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if (mounted) {
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setState(() {
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_imageProvider = imageProvider;
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_hasLoadedThumbnail = true;
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});
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}
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});
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} else {
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widget.photo
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.getAsset()
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.thumbDataWithSize(THUMBNAIL_SMALL_SIZE, THUMBNAIL_SMALL_SIZE)
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.then((data) {
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if (mounted) {
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setState(() {
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if (data != null) {
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final imageProvider = Image.memory(data).image;
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precacheImage(imageProvider, context).then((value) {
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if (mounted) {
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setState(() {
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_imageProvider = imageProvider;
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_hasLoadedThumbnail = true;
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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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ThumbnailLruCache.put(widget.photo, THUMBNAIL_SMALL_SIZE, data);
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});
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}
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}
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if (_imageProvider != null) {
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return Image(
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image: _imageProvider,
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fit: BoxFit.cover,
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);
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} else {
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return loadingWidget;
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}
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}
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@override
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void didUpdateWidget(ThumbnailWidget oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.photo.generatedId != oldWidget.photo.generatedId) {
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setState(() {
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_hasLoadedThumbnail = false;
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_imageProvider = null;
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});
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}
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}
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}
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