125 lines
3.4 KiB
Dart
125 lines
3.4 KiB
Dart
import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:logger/logger.dart';
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import 'package:myapp/core/lru_map.dart';
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import 'package:myapp/models/photo.dart';
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import 'package:photo_view/photo_view.dart';
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import 'extents_page_view.dart';
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import 'loading_widget.dart';
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import 'package:myapp/utils/share_util.dart';
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class DetailPage extends StatefulWidget {
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final List<Photo> photos;
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final int selectedIndex;
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DetailPage(this.photos, this.selectedIndex, {Key key}) : super(key: key);
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@override
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_DetailPageState createState() => _DetailPageState();
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}
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class _DetailPageState extends State<DetailPage> {
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bool _shouldDisableScroll = false;
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int _selectedIndex = 0;
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final _cachedImages = LRUMap<int, ZoomableImage>(5);
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@override
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Widget build(BuildContext context) {
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_selectedIndex = widget.selectedIndex;
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Logger().i("Loading " + widget.photos[_selectedIndex].toString());
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var pageController = PageController(initialPage: _selectedIndex);
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return Scaffold(
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appBar: _buildAppBar(),
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body: Center(
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child: Container(
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child: ExtentsPageView.extents(
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itemBuilder: (context, index) {
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if (_cachedImages.get(index) != null) {
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return _cachedImages.get(index);
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}
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final image = ZoomableImage(
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photo: widget.photos[index],
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shouldDisableScroll: (value) {
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setState(() {
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_shouldDisableScroll = value;
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});
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},
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);
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_cachedImages.put(index, image);
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return image;
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},
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onPageChanged: (int index) {
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_selectedIndex = index;
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},
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physics: _shouldDisableScroll
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? NeverScrollableScrollPhysics()
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: PageScrollPhysics(),
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controller: pageController,
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itemCount: widget.photos.length,
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),
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),
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),
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);
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}
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AppBar _buildAppBar() {
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return AppBar(
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actions: <Widget>[
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IconButton(
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icon: Icon(Icons.share),
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onPressed: () async {
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share(widget.photos[_selectedIndex]);
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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 ZoomableImage extends StatelessWidget {
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final Function(bool) shouldDisableScroll;
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const ZoomableImage({
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Key key,
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@required this.photo,
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this.shouldDisableScroll,
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}) : super(key: key);
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final Photo photo;
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@override
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Widget build(BuildContext context) {
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Logger().i("Building " + photo.toString());
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if (ImageLruCache.getData(photo.generatedId) != null) {
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return _buildPhotoView(ImageLruCache.getData(photo.generatedId));
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}
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return FutureBuilder<Uint8List>(
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future: photo.getBytes(),
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builder: (_, snapshot) {
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if (snapshot.hasData) {
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return _buildPhotoView(snapshot.data);
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} else if (snapshot.hasError) {
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return Text(snapshot.error.toString());
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} else {
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return loadWidget;
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}
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},
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);
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}
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Widget _buildPhotoView(Uint8List imageData) {
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ValueChanged<PhotoViewScaleState> scaleStateChangedCallback = (value) {
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if (shouldDisableScroll != null) {
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shouldDisableScroll(value != PhotoViewScaleState.initial);
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}
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};
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return PhotoView(
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imageProvider: Image.memory(imageData).image,
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scaleStateChangedCallback: scaleStateChangedCallback,
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minScale: PhotoViewComputedScale.contained,
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);
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}
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}
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