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correct offset when scrollController with initialScrollOffset #7

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correct offset when scrollController with initialScrollOffset #7

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10 changes: 10 additions & 0 deletions lib/draggable_scrollbar.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -346,6 +346,16 @@ class _DraggableScrollbarState extends State<DraggableScrollbar>
parent: _labelAnimationController,
curve: Curves.fastOutSlowIn,
);

WidgetsBinding.instance.addPostFrameCallback((_) =>
_initOffsetForScrollInitialOffset());
}

/// init offset when widgets finish loading
void _initOffsetForScrollInitialOffset() {
_viewOffset = widget.controller.initialScrollOffset;
_barOffset = _viewOffset / viewMaxScrollExtent * barMaxScrollExtent;
setState(() {});
}

@override
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