Type of base layer SpreadsheetData instance
Type of edit layer SpreadsheetData instance
Type of snapshot used by BaseData. By default, inferred from BaseData.
Type of snapshot used by EditData. By default, inferred from EditData.
Creates a LayeredSpreadsheetData instance from two existing SpreadsheetData instances.
All type parameters can be inferred from the constructor arguments.
Format of specified cell using 0-based row and column indexes
Value of specified cell using 0-based row and column indexes
Number of columns in the spreadsheet
ItemOffsetMapping which describes sizes and offsets to start of columns
Number of rows in the spreadsheet
ItemOffsetMapping which describes sizes and offsets to start of rows
Return a snapshot to use when accessing values at a consistent point in time
Subscribe to data changes
Implementation of SpreadsheetData that layers two other
SpreadsheetDatainstances on top of each other.There's an "edit" layer on top where any changes are stored, with a "base" layer underneath. If a value is
undefinedin the edit layer, the corresponding value is returned from the base layer instead.Common use case is a read only reference data source as the base layer with an initially empty edit layer that accepts changes.