lemmur-app-android/lib/pages/media_view.dart

156 lines
5.2 KiB
Dart

import 'dart:math' show max, min;
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:matrix4_transform/matrix4_transform.dart';
import 'package:photo_view/photo_view.dart';
import '../util/share.dart';
import '../widgets/bottom_modal.dart';
/// View to interact with a media object. Zoom in/out, download, share, etc.
class MediaViewPage extends HookWidget {
final String url;
static const yThreshold = 150;
static const speedThreshold = 45;
const MediaViewPage(this.url);
@override
Widget build(BuildContext context) {
final showButtons = useState(true);
final isZoomedOut = useState(true);
final scaleIsInitial = useState(true);
final isDragging = useState(false);
final offset = useState(Offset.zero);
final prevOffset = usePrevious(offset.value) ?? Offset.zero;
notImplemented() {
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
content: Text("this feature hasn't been implemented yet 😰")));
}
// TODO: hide navbar and topbar on android without a content jump
sharePhoto() {
showBottomModal(
context: context,
builder: (context) => Column(
children: [
ListTile(
leading: const Icon(Icons.link),
title: const Text('Share link'),
onTap: () {
Navigator.of(context).pop();
share(url, context: context);
},
),
ListTile(
leading: const Icon(Icons.image),
title: const Text('Share file'),
onTap: () {
Navigator.of(context).pop();
notImplemented();
// TODO: share file
},
),
],
),
);
}
return Scaffold(
extendBodyBehindAppBar: true,
extendBody: true,
backgroundColor:
Colors.black.withOpacity(max(0, 1.0 - (offset.value.dy.abs() / 200))),
appBar: showButtons.value
? AppBar(
brightness: Brightness.dark,
iconTheme: const IconThemeData(color: Colors.white),
backgroundColor: Colors.black38,
leading: const CloseButton(),
actions: [
IconButton(
icon: const Icon(Icons.share),
tooltip: 'share',
onPressed: sharePhoto,
),
IconButton(
icon: const Icon(Icons.file_download),
tooltip: 'download',
onPressed: notImplemented,
),
],
)
: null,
body: Listener(
onPointerMove: scaleIsInitial.value
? (event) {
if (!isDragging.value &&
event.delta.dx.abs() > event.delta.dy.abs()) return;
isDragging.value = true;
offset.value += event.delta;
}
: (_) => isDragging.value = false,
onPointerCancel: (_) => offset.value = Offset.zero,
onPointerUp: isZoomedOut.value
? (_) {
if (!isDragging.value) {
showButtons.value = !showButtons.value;
return;
}
isDragging.value = false;
final speed = (offset.value - prevOffset).distance;
if (speed > speedThreshold ||
offset.value.dy.abs() > yThreshold) {
Navigator.of(context).pop();
} else {
offset.value = Offset.zero;
}
}
: (_) {
offset.value = Offset.zero;
isDragging.value = false;
},
child: AnimatedContainer(
transform: Matrix4Transform()
.scale(max(0.9, 1 - offset.value.dy.abs() / 1000))
.translateOffset(offset.value)
.rotate(min(-offset.value.dx / 2000, 0.1))
.matrix4,
duration: isDragging.value
? Duration.zero
: const Duration(milliseconds: 200),
child: PhotoView(
backgroundDecoration:
const BoxDecoration(color: Colors.transparent),
scaleStateChangedCallback: (value) {
isZoomedOut.value = value == PhotoViewScaleState.zoomedOut ||
value == PhotoViewScaleState.initial;
showButtons.value = isZoomedOut.value;
scaleIsInitial.value = value == PhotoViewScaleState.initial;
isDragging.value = false;
offset.value = Offset.zero;
},
onTapUp: isZoomedOut.value
? null
: (_, __, ___) => showButtons.value = !showButtons.value,
minScale: PhotoViewComputedScale.contained,
initialScale: PhotoViewComputedScale.contained,
imageProvider: CachedNetworkImageProvider(url),
heroAttributes: PhotoViewHeroAttributes(tag: url),
loadingBuilder: (context, event) =>
const Center(child: CircularProgressIndicator()),
),
),
),
);
}
}