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[iOS][VirtualizedList] Fix scroll over bottom with scrollToIndex #19970

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[iOS][VirtualizedList] Fix scroll over bottom with scrollToIndex #19970

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11 changes: 8 additions & 3 deletions Libraries/Lists/VirtualizedList.js
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Original file line number Diff line number Diff line change
Expand Up @@ -321,12 +321,17 @@ class VirtualizedList extends React.PureComponent<Props, State> {
return;
}
const frame = this._getFrameMetricsApprox(index);

const maxOffset = Math.max(0, this._scrollMetrics.contentLength - this._scrollMetrics.visibleLength);
const offset =
Math.max(
0,
frame.offset -
(viewPosition || 0) *
(this._scrollMetrics.visibleLength - frame.length),
Math.min(
maxOffset,
frame.offset -
(viewPosition || 0) *
(this._scrollMetrics.visibleLength - frame.length),
)
) - (viewOffset || 0);
/* $FlowFixMe(>=0.53.0 site=react_native_fb,react_native_oss) This comment
* suppresses an error when upgrading Flow's support for React. To see the
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