145 lines
4 KiB
Dart
145 lines
4 KiB
Dart
import 'dart:math';
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import 'dart:typed_data';
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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:aves/widgets/common/icons.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 StatelessWidget {
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final ImageEntry 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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Widget build(BuildContext context) {
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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: Stack(
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alignment: AlignmentDirectional.bottomStart,
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children: [
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ThumbnailImage(
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entry: entry,
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extent: extent,
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devicePixelRatio: devicePixelRatio,
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),
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_buildOverlayIcons(),
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],
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),
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);
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}
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Widget _buildOverlayIcons() {
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final fontSize = min(14.0, (extent / 8).roundToDouble());
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final iconSize = fontSize * 2;
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return DefaultTextStyle(
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style: TextStyle(
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color: Colors.grey[200],
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fontSize: fontSize,
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),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.end,
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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if (entry.hasGps) GpsIcon(iconSize: iconSize),
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if (entry.isGif)
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GifIcon(iconSize: iconSize)
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else if (entry.isVideo)
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VideoIcon(
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entry: entry,
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iconSize: 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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class ThumbnailImage extends StatefulWidget {
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final ImageEntry entry;
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final double extent;
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final double devicePixelRatio;
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const ThumbnailImage({
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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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State<StatefulWidget> createState() => ThumbnailImageState();
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}
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class ThumbnailImageState extends State<ThumbnailImage> {
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Future<Uint8List> _byteLoader;
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Listenable _entryChangeNotifier;
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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([entry.imageChangeNotifier, entry.metadataChangeNotifier]);
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_entryChangeNotifier.addListener(onEntryChange);
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initByteLoader();
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}
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@override
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void didUpdateWidget(ThumbnailImage oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.extent == oldWidget.extent && uri == oldWidget.entry.uri && widget.entry.width == oldWidget.entry.width && widget.entry.height == oldWidget.entry.height && widget.entry.orientationDegrees == oldWidget.entry.orientationDegrees) return;
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initByteLoader();
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}
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initByteLoader() {
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final dim = (widget.extent * widget.devicePixelRatio).round();
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_byteLoader = ImageFileService.getImageBytes(widget.entry, dim, dim);
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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.length > 0
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? Hero(
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tag: entry.uri,
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child: LayoutBuilder(builder: (context, constraints) {
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final dim = min(constraints.maxWidth, constraints.maxHeight);
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return 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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: Icon(Icons.error);
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});
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}
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}
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