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Eagerly load next set of results

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This commit is contained in:
Vishnu Mohandas 2020-07-15 13:56:31 +05:30
parent e96f5f0a1f
commit 89d4feffed
1 changed files with 20 additions and 9 deletions
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29
lib/ui/gallery.dart
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@ -43,6 +43,7 @@ class Gallery extends StatefulWidget {
class _GalleryState extends State<Gallery> {
static final int kLoadLimit = 100;
static final int kEagerLoadTrigger = 10;
final Logger _logger = Logger("Gallery");
final List<List<File>> _collatedFiles = List<List<File>>();
@ -133,19 +134,14 @@ class _GalleryState extends State<Gallery> {
}
Widget _buildListItem(BuildContext context, int index) {
if (_shouldLoadNextItems(index)) {
// Eagerly load next batch
_loadNextItems();
}
if (index == _collatedFiles.length) {
if (_hasLoadedAll || widget.asyncLoader == null) {
return Container();
}
widget.asyncLoader(_files.length, 100).then((files) {
setState(() {
_scrollOffset = _scrollController.offset;
if (files.length == 0) {
_hasLoadedAll = true;
}
_files.addAll(files);
});
});
return loadWidget;
}
var files = _collatedFiles[index];
@ -154,6 +150,21 @@ class _GalleryState extends State<Gallery> {
);
}
bool _shouldLoadNextItems(int index) =>
index == _collatedFiles.length - kEagerLoadTrigger;
void _loadNextItems() {
widget.asyncLoader(_files.length, 100).then((files) {
setState(() {
_scrollOffset = _scrollController.offset;
if (files.length == 0) {
_hasLoadedAll = true;
}
_files.addAll(files);
});
});
}
Widget _getDay(int timestamp) {
return Container(
padding: const EdgeInsets.all(8.0),