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Preserve the listview's scroll position on extra data load

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This commit is contained in:
Vishnu Mohandas 2020-07-15 13:38:10 +05:30
parent f77f14eb79
commit bde40929be
1 changed files with 10 additions and 3 deletions
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13
lib/ui/gallery.dart
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@ -42,13 +42,15 @@ class Gallery extends StatefulWidget {
}
class _GalleryState extends State<Gallery> {
final Logger _logger = Logger("Gallery");
static final int kLoadLimit = 100;
final ScrollController _scrollController = ScrollController();
final Logger _logger = Logger("Gallery");
final List<List<File>> _collatedFiles = List<List<File>>();
ScrollController _scrollController = ScrollController();
bool _requiresLoad = false;
bool _hasLoadedAll = false;
double _scrollOffset = 0;
Set<File> _selectedFiles = HashSet<File>();
List<File> _files;
RefreshController _refreshController = RefreshController();
@ -99,6 +101,9 @@ class _GalleryState extends State<Gallery> {
}
_selectedFiles = widget.selectedFiles ?? Set<File>();
_collateFiles();
_scrollController = ScrollController(
initialScrollOffset: _scrollOffset,
);
final list = ListView.builder(
itemCount: _collatedFiles.length + 1, // h4ck to load the next set
itemBuilder: _buildListItem,
@ -134,6 +139,7 @@ class _GalleryState extends State<Gallery> {
}
widget.asyncLoader(_files.length, 100).then((files) {
setState(() {
_scrollOffset = _scrollController.offset;
if (files.length == 0) {
_hasLoadedAll = true;
}
@ -163,7 +169,8 @@ class _GalleryState extends State<Gallery> {
return GridView.builder(
shrinkWrap: true,
padding: EdgeInsets.only(bottom: 12),
physics: ScrollPhysics(), // to disable GridView's scrolling
physics:
NeverScrollableScrollPhysics(), // to disable GridView's scrolling
itemBuilder: (context, index) {
return _buildFile(context, files[index]);
},