freezer/lib/ui/cached_image.dart

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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
import 'package:palette_generator/palette_generator.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:photo_view/photo_view.dart';
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ImagesDatabase imagesDatabase = ImagesDatabase();
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class ImagesDatabase {
/*
!!! Using the wrappers so i don't have to rewrite most of the code, because of migration to cached network image
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*/
void saveImage(String url) {
CachedNetworkImageProvider(url);
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}
Future<PaletteGenerator> getPaletteGenerator(String url) {
return PaletteGenerator.fromImageProvider(CachedNetworkImageProvider(url));
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}
Future<Color> getPrimaryColor(String url) async {
PaletteGenerator paletteGenerator = await getPaletteGenerator(url);
return paletteGenerator.colors.first;
}
Future<bool> isDark(String url) async {
PaletteGenerator paletteGenerator = await getPaletteGenerator(url);
return paletteGenerator.colors.first.computeLuminance() > 0.5 ? false : true;
}
}
class CachedImage extends StatefulWidget {
final String url;
final double width;
final double height;
final bool circular;
final bool fullThumb;
final bool rounded;
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const CachedImage({Key key, this.url, this.height, this.width, this.circular = false, this.fullThumb = false, this.rounded = false}): super(key: key);
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@override
_CachedImageState createState() => _CachedImageState();
}
class _CachedImageState extends State<CachedImage> {
@override
Widget build(BuildContext context) {
if (widget.rounded) return ClipRRect(
borderRadius: BorderRadius.circular(8.0),
child: CachedImage(url: widget.url, height: widget.height, width: widget.width, circular: false, rounded: false, fullThumb: widget.fullThumb),
);
if (widget.circular) return ClipOval(
child: CachedImage(url: widget.url, height: widget.height, width: widget.width, circular: false, rounded: false, fullThumb: widget.fullThumb,)
);
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if (!widget.url.startsWith('http'))
return Image.asset(
widget.url,
width: widget.width,
height: widget.height,
);
return CachedNetworkImage(
imageUrl: widget.url,
width: widget.width,
height: widget.height,
placeholder: (context, url) {
if (widget.fullThumb) return Image.asset('assets/cover.jpg', width: widget.width, height: widget.height,);
return Image.asset('assets/cover_thumb.jpg', width: widget.width, height: widget.height);
},
errorWidget: (context, url, error) => Image.asset('assets/cover_thumb.jpg', width: widget.width, height: widget.height),
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);
}
}
class ZoomableImage extends StatefulWidget {
final String url;
final bool rounded;
final double width;
ZoomableImage({@required this.url, this.rounded = false, this.width});
@override
_ZoomableImageState createState() => _ZoomableImageState();
}
class _ZoomableImageState extends State<ZoomableImage> {
BuildContext ctx;
PhotoViewController controller;
bool photoViewOpened = false;
@override
void initState() {
super.initState();
controller = PhotoViewController()
..outputStateStream.listen(listener);
}
// Listener of PhotoView scale changes. Used for closing PhotoView by pinch-in
void listener(PhotoViewControllerValue value) {
if (value.scale < 0.16 && photoViewOpened) {
Navigator.pop(ctx);
photoViewOpened = false; // to avoid multiple pop() when picture are being scaled out too slowly
}
}
@override
Widget build(BuildContext context) {
ctx = context;
return FlatButton(
child: CachedImage(
url: widget.url,
rounded: widget.rounded,
width: widget.width,
fullThumb: true,
),
onPressed: () {
Navigator.of(context).push(PageRouteBuilder(
opaque: false, // transparent background
pageBuilder: (context, a, b) {
photoViewOpened = true;
return PhotoView(
imageProvider: CachedNetworkImageProvider(widget.url),
maxScale: 8.0,
minScale: 0.2,
controller: controller,
backgroundDecoration:
BoxDecoration(color: Color.fromARGB(0x90, 0, 0, 0)));
}));
});
}
}