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pic_swiper.dart
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pic_swiper.dart
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import 'dart:async';
import 'dart:math';
import 'dart:ui';
import 'package:byr_mobile_app/nforum/nforum_service.dart';
import 'package:extended_image/extended_image.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart' hide Image;
import 'package:flutter/rendering.dart';
import 'package:gallery_saver/gallery_saver.dart';
import 'package:get/get.dart';
import 'adaptive_components.dart';
double initScale({Size imageSize, Size size, double initialScale}) {
var n1 = imageSize.height / imageSize.width;
var n2 = size.height / size.width;
if (n1 > n2) {
final FittedSizes fittedSizes = applyBoxFit(BoxFit.contain, imageSize, size);
Size destinationSize = fittedSizes.destination;
return destinationSize.height / size.height;
} else if (n1 / n2 < 1 / 4) {
final FittedSizes fittedSizes = applyBoxFit(BoxFit.contain, imageSize, size);
Size destinationSize = fittedSizes.destination;
return destinationSize.width / size.width;
}
return initialScale;
}
Future<bool> saveNetworkImageToPhoto(String url, {bool useCache: true}) async {
var img = await NForumService.getImage(url);
return await GallerySaver.saveImage(img.path, albumName: 'BYRDownload');
}
class PicSwiperItem {
final String picUrl;
final String des;
PicSwiperItem({
@required this.picUrl,
this.des = "",
});
}
class PicSwiper extends StatefulWidget {
final int index;
final List<PicSwiperItem> pics;
PicSwiper({this.index, this.pics});
@override
_PicSwiperState createState() => _PicSwiperState();
}
class _PicSwiperState extends State<PicSwiper> with SingleTickerProviderStateMixin {
var rebuildIndex = StreamController<int>.broadcast();
var rebuildSwiper = StreamController<bool>.broadcast();
AnimationController _animationController;
Animation<double> _animation;
Function animationListener;
List<double> doubleTapScales = <double>[1.0, 2.0];
GlobalKey<ExtendedImageSlidePageState> slidePagekey = GlobalKey<ExtendedImageSlidePageState>();
int currentIndex;
bool _showSwiper = true;
@override
void initState() {
currentIndex = widget.index;
_animationController = AnimationController(duration: const Duration(milliseconds: 150), vsync: this);
super.initState();
}
@override
void dispose() {
rebuildIndex.close();
rebuildSwiper.close();
_animationController?.dispose();
clearGestureDetailsCache();
super.dispose();
}
@override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
Widget result = Material(
color: Colors.black,
shadowColor: Colors.transparent,
child: Stack(
fit: StackFit.expand,
children: <Widget>[
ExtendedImageGesturePageView.builder(
itemBuilder: (BuildContext context, int index) {
var item = widget.pics[index].picUrl;
Widget image = ExtendedImage.network(
item,
fit: BoxFit.contain,
enableSlideOutPage: true,
mode: ExtendedImageMode.gesture,
heroBuilderForSlidingPage: (Widget result) {
if (index < min(9, widget.pics.length)) {
return Hero(
tag: item,
child: result,
flightShuttleBuilder: (BuildContext flightContext,
Animation<double> animation,
HeroFlightDirection flightDirection,
BuildContext fromHeroContext,
BuildContext toHeroContext) {
final Hero hero = flightDirection == HeroFlightDirection.pop
? fromHeroContext.widget
: toHeroContext.widget;
return hero.child;
},
);
} else {
return result;
}
},
initGestureConfigHandler: (state) {
double initialScale = 1.0;
if (state.extendedImageInfo != null && state.extendedImageInfo.image != null) {
initialScale = initScale(
size: size,
initialScale: initialScale,
imageSize: Size(state.extendedImageInfo.image.width.toDouble(),
state.extendedImageInfo.image.height.toDouble()));
}
return GestureConfig(
inPageView: true,
initialScale: initialScale,
minScale: min(initialScale, 0.8),
maxScale: max(initialScale, 5.0),
animationMaxScale: max(initialScale, 5.0),
initialAlignment: InitialAlignment.center,
cacheGesture: false);
},
onDoubleTap: (ExtendedImageGestureState state) {
var pointerDownPosition = state.pointerDownPosition;
double begin = state.gestureDetails.totalScale;
double end;
_animation?.removeListener(animationListener);
_animationController.stop();
_animationController.reset();
if (begin == doubleTapScales[0]) {
end = doubleTapScales[1];
} else {
end = doubleTapScales[0];
}
animationListener = () {
state.handleDoubleTap(scale: _animation.value, doubleTapPosition: pointerDownPosition);
};
_animation = _animationController.drive(Tween<double>(begin: begin, end: end));
_animation.addListener(animationListener);
_animationController.forward();
},
);
Widget imageWrapper = GestureDetector(
child: image,
onTap: () {
slidePagekey.currentState.popPage();
Navigator.pop(context);
},
);
return imageWrapper;
},
itemCount: widget.pics.length,
onPageChanged: (int index) {
currentIndex = index;
rebuildIndex.add(index);
},
controller: PageController(
initialPage: currentIndex,
),
scrollDirection: Axis.horizontal,
physics: BouncingScrollPhysics(),
),
StreamBuilder<bool>(
builder: (c, d) {
if (d.data == null || !d.data) return Container();
return Positioned(
bottom: 0.0,
top: 0.0,
left: 0.0,
right: 0.0,
child: MySwiperPlugin(widget.pics, currentIndex, rebuildIndex),
);
},
initialData: true,
stream: rebuildSwiper.stream,
)
],
));
result = ExtendedImageSlidePage(
key: slidePagekey,
child: result,
slideAxis: SlideAxis.both,
slideType: SlideType.onlyImage,
onSlidingPage: (state) {
var showSwiper = !state.isSliding;
if (showSwiper != _showSwiper) {
_showSwiper = showSwiper;
rebuildSwiper.add(_showSwiper);
}
},
);
return result;
}
}
class MySwiperPlugin extends StatelessWidget {
final List<PicSwiperItem> pics;
final int index;
final StreamController<int> reBuild;
MySwiperPlugin(this.pics, this.index, this.reBuild);
@override
Widget build(BuildContext context) {
return StreamBuilder<int>(
builder: (BuildContext context, data) {
return Stack(
children: <Widget>[
Positioned(
top: 25,
left: 0.0,
right: 0.0,
child: SafeArea(
child: Container(
alignment: Alignment.center,
child: Text(
"${data.data + 1}/${pics.length}",
style: TextStyle(color: Colors.white, fontSize: 18.0),
),
),
),
),
if (!kIsWeb)
Positioned(
bottom: 25,
left: 0.0,
right: 10.0,
child: SafeArea(
child: GestureDetector(
onTap: () async {
var toDownload = index;
if (data.hasData) {
toDownload = data.data;
}
bool success = await saveNetworkImageToPhoto(pics[toDownload].picUrl);
String result = success ? "succeed".tr : "fail".tr;
AdaptiveComponents.showToast(context, "saveTrans".tr + result);
},
child: Container(
alignment: Alignment.centerRight,
child: Container(
width: 40,
height: 40,
padding: EdgeInsets.all(5),
decoration: BoxDecoration(
color: Colors.grey.withOpacity(0.5),
borderRadius: BorderRadius.circular(5.0),
),
child: Icon(
Icons.save_alt,
color: Colors.white,
),
),
),
),
),
),
],
);
},
initialData: index,
stream: reBuild.stream,
);
}
}