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Save last scroll position

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This commit is contained in:
Vishnu Mohandas 2020-11-16 13:42:42 +05:30
parent 50150f507f
commit f5ae71ca17
1 changed files with 6 additions and 3 deletions
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9
lib/ui/gallery.dart
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@ -73,13 +73,13 @@ class _GalleryState extends State<Gallery> {
if (widget.asyncLoader == null) {
_hasLoadedAll = true;
}
_itemPositionsListener.itemPositions.addListener(_moveScrollbar);
_itemPositionsListener.itemPositions.addListener(_updateScrollbar);
super.initState();
}
@override
void dispose() {
_itemPositionsListener.itemPositions.removeListener(_moveScrollbar);
_itemPositionsListener.itemPositions.removeListener(_updateScrollbar);
super.dispose();
}
@ -119,6 +119,7 @@ class _GalleryState extends State<Gallery> {
_collatedFiles.length + (widget.headerWidget == null ? 1 : 2);
return DraggableScrollbar.semicircle(
key: _scrollKey,
initialScrollIndex: _lastIndex,
labelTextBuilder: (position) {
final index =
min((position * itemCount).floor(), _collatedFiles.length - 1);
@ -146,6 +147,7 @@ class _GalleryState extends State<Gallery> {
itemCount: itemCount,
itemBuilder: _buildListItem,
itemScrollController: _scrollController,
initialScrollIndex: _lastIndex,
minCacheExtent: 1500,
addAutomaticKeepAlives: true,
physics: _MaxVelocityPhysics(velocityThreshold: 128),
@ -315,8 +317,9 @@ class _GalleryState extends State<Gallery> {
firstDate.day == secondDate.day;
}
void _moveScrollbar() {
void _updateScrollbar() {
final index = _itemPositionsListener.itemPositions.value.first.index;
_lastIndex = index;
_scrollKey.currentState?.setPosition(index / _collatedFiles.length);
}
}