Reference
VirtualRange
Describes visible and overscanned item bounds plus spacer sizes for a virtual range.
Signature
interface VirtualRangeMembers
bottomSpacerPx: numbercolumnCount: numberendIndex: numberendRow: numberitemCount: numberrowCount: numberstartIndex: numberstartRow: numbertopSpacerPx: numbertotalSizePx: numbervisibleEndIndex: numbervisibleEndRow: numbervisibleStartIndex: numbervisibleStartRow: number