100 lines
2.6 KiB
Dart
100 lines
2.6 KiB
Dart
import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:photos/core/cache/lru_map.dart';
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import 'package:photos/models/photo.dart';
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import 'package:photos/ui/extents_page_view.dart';
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import 'package:photos/ui/zoomable_image.dart';
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import 'package:photos/utils/share_util.dart';
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import 'package:logging/logging.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}) : 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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final logger = Logger("DetailPageState");
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bool _shouldDisableScroll = false;
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List<Photo> _photos;
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int _selectedIndex = 0;
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PageController _pageController;
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LRUMap<int, ZoomableImage> _cachedImages;
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@override
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void initState() {
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_photos = widget.photos;
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_selectedIndex = widget.selectedIndex;
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_cachedImages = LRUMap<int, ZoomableImage>(5);
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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logger.info("Opening " +
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_photos[_selectedIndex].toString() +
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". " +
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_selectedIndex.toString() +
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" / " +
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_photos.length.toString() +
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" photos .");
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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: _buildPageView(),
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),
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),
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);
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}
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Widget _buildPageView() {
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_pageController = PageController(initialPage: _selectedIndex);
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return ExtentsPageView.extents(
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itemBuilder: (context, index) {
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final photo = _photos[index];
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if (_cachedImages.get(photo.generatedId) != null) {
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return _cachedImages.get(photo.generatedId);
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}
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final image = ZoomableImage(
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photo,
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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(photo.generatedId, image);
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return image;
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},
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extents: 1,
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onPageChanged: (int index) {
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logger.info("onPageChanged to " + index.toString());
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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: _photos.length,
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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(_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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