108 lines
2.9 KiB
Dart
108 lines
2.9 KiB
Dart
import 'package:wonders/common_libs.dart';
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import 'package:wonders/ui/common/utils/app_haptics.dart';
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class FullscreenUrlImgViewer extends StatefulWidget {
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const FullscreenUrlImgViewer({Key? key, required this.urls, this.index = 0}) : super(key: key);
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final List<String> urls;
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final int index;
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static const double imageScale = 2.5;
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@override
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State<FullscreenUrlImgViewer> createState() => _FullscreenUrlImgViewerState();
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}
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class _FullscreenUrlImgViewerState extends State<FullscreenUrlImgViewer> {
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final _isZoomed = ValueNotifier(false);
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late final _controller = PageController(initialPage: widget.index);
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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void _handleBackPressed() => Navigator.pop(context, _controller.page!.round());
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@override
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Widget build(BuildContext context) {
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Widget content = AnimatedBuilder(
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animation: _isZoomed,
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builder: (_, __) {
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final bool enableSwipe = !_isZoomed.value && widget.urls.length > 1;
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return PageView.builder(
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physics: enableSwipe ? PageScrollPhysics() : NeverScrollableScrollPhysics(),
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controller: _controller,
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itemCount: widget.urls.length,
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itemBuilder: (_, index) => _Viewer(widget.urls[index], _isZoomed),
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onPageChanged: (_) => AppHaptics.lightImpact(),
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);
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},
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);
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content = Semantics(
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label: $strings.fullscreenImageViewerSemanticFull,
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container: true,
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image: true,
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child: ExcludeSemantics(child: content),
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);
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return Container(
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color: $styles.colors.black,
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child: Stack(
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children: [
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Positioned.fill(child: content),
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BackBtn.close(onPressed: _handleBackPressed).safe(),
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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 _Viewer extends StatefulWidget {
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const _Viewer(this.url, this.isZoomed, {Key? key}) : super(key: key);
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final String url;
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final ValueNotifier<bool> isZoomed;
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@override
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State<_Viewer> createState() => _ViewerState();
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}
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class _ViewerState extends State<_Viewer> with SingleTickerProviderStateMixin {
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final _controller = TransformationController();
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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/// Reset zoom level to 1 on double-tap
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void _handleDoubleTap() => _controller.value = Matrix4.identity();
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@override
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Widget build(BuildContext context) {
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return GestureDetector(
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onDoubleTap: _handleDoubleTap,
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child: InteractiveViewer(
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transformationController: _controller,
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onInteractionEnd: (_) => widget.isZoomed.value = _controller.value.getMaxScaleOnAxis() > 1,
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minScale: 1,
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maxScale: 5,
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child: Hero(
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tag: widget.url,
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child: AppImage(
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image: NetworkImage(
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widget.url,
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),
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fit: BoxFit.contain,
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scale: FullscreenUrlImgViewer.imageScale,
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progress: true,
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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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