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Add cache to prevent gallery reloads for each rebuild

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This commit is contained in:
Vishnu Mohandas 2020-06-15 18:16:51 +05:30
parent d5580915e3
commit baeb54f534
1 changed files with 26 additions and 12 deletions
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38
lib/ui/gallery.dart
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@ -35,6 +35,9 @@ class Gallery extends StatefulWidget {
class _GalleryState extends State<Gallery> {
final ScrollController _scrollController = ScrollController();
final List<List<Photo>> _collatedPhotos = List<List<Photo>>();
bool _requiresLoad = false;
AsyncSnapshot<List<Photo>> _lastSnapshot;
Set<Photo> _selectedPhotos = HashSet<Photo>();
List<Photo> _photos;
RefreshController _refreshController = RefreshController();
@ -43,6 +46,7 @@ class _GalleryState extends State<Gallery> {
@override
void initState() {
_requiresLoad = true;
_subscription = Bus.instance.on<PhotoOpenedEvent>().listen((event) {
setState(() {
_openedPhoto = event.photo;
@ -59,26 +63,34 @@ class _GalleryState extends State<Gallery> {
@override
Widget build(BuildContext context) {
// TODO: Investigate reason for multiple rebuilds on selection change
if (!_requiresLoad) {
return _onSnapshotAvailable(_lastSnapshot);
}
return FutureBuilder<List<Photo>>(
future: widget.loadFunction(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return _onDataLoaded(snapshot);
} else if (snapshot.hasError) {
return Center(child: Text(snapshot.error.toString()));
} else {
return Center(child: loadWidget);
}
_requiresLoad = false;
_lastSnapshot = snapshot;
return _onSnapshotAvailable(snapshot);
},
);
}
Widget _onDataLoaded(AsyncSnapshot<List<Photo>> snapshot) {
if (snapshot.data.isEmpty) {
Widget _onSnapshotAvailable(AsyncSnapshot<List<Photo>> snapshot) {
if (snapshot.hasData) {
return _onDataLoaded(snapshot.data);
} else if (snapshot.hasError) {
return Center(child: Text(snapshot.error.toString()));
} else {
return Center(child: loadWidget);
}
}
Widget _onDataLoaded(List<Photo> photos) {
_photos = photos;
if (_photos.isEmpty) {
return Center(child: Text("Nothing to see here."));
}
_photos = snapshot.data;
_selectedPhotos = widget.selectedPhotos ?? Set<Photo>();
_collatePhotos();
final list = ListView.builder(
@ -101,7 +113,9 @@ class _GalleryState extends State<Gallery> {
onRefresh: () {
widget.syncFunction().then((_) {
_refreshController.refreshCompleted();
widget.loadFunction().then((_) => setState(() {}));
widget.loadFunction().then((_) => setState(() {
_requiresLoad = true;
}));
}).catchError((e) {
_refreshController.refreshFailed();
});