82 lines
2.5 KiB
Dart
82 lines
2.5 KiB
Dart
import 'dart:typed_data';
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import 'package:after_init/after_init.dart';
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import 'package:aves/model/image_entry.dart';
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import 'package:aves/model/image_file_service.dart';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import 'package:transparent_image/transparent_image.dart';
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class ImagePreview extends StatefulWidget {
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final ImageEntry entry;
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final double width, height;
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final Widget Function(Uint8List bytes) builder;
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const ImagePreview({
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Key key,
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@required this.entry,
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@required this.width,
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@required this.height,
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@required this.builder,
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}) : super(key: key);
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@override
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State<StatefulWidget> createState() => ImagePreviewState();
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}
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class ImagePreviewState extends State<ImagePreview> with AfterInitMixin {
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Future<Uint8List> _byteLoader;
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Listenable _entryChangeNotifier;
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double _devicePixelRatio;
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ImageEntry get entry => widget.entry;
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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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_entryChangeNotifier = Listenable.merge([
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entry.imageChangeNotifier,
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entry.metadataChangeNotifier
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]);
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_entryChangeNotifier.addListener(onEntryChange);
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}
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@override
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void didInitState() {
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_devicePixelRatio = Provider.of<MediaQueryData>(context, listen: false).devicePixelRatio;
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initByteLoader();
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}
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@override
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void didUpdateWidget(ImagePreview old) {
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super.didUpdateWidget(old);
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if (widget.width == old.width && widget.height == old.height && uri == old.entry.uri && widget.entry.width == old.entry.width && widget.entry.height == old.entry.height && widget.entry.orientationDegrees == old.entry.orientationDegrees) return;
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initByteLoader();
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}
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initByteLoader() {
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final width = (widget.width * _devicePixelRatio).round();
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final height = (widget.height * _devicePixelRatio).round();
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_byteLoader = ImageFileService.getImageBytes(widget.entry, width, height);
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}
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onEntryChange() => setState(() => initByteLoader());
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@override
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void dispose() {
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_entryChangeNotifier.removeListener(onEntryChange);
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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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return FutureBuilder(
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future: _byteLoader,
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builder: (futureContext, AsyncSnapshot<Uint8List> snapshot) {
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final bytes = (snapshot.connectionState == ConnectionState.done && !snapshot.hasError) ? snapshot.data : kTransparentImage;
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return bytes.isNotEmpty ? widget.builder(bytes) : Icon(Icons.error);
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});
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}
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}
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