getOffset method
Gets the top-left offset of a cell at the specified position.
Calculates the cumulative offset by summing the widths of all columns before the specified column and heights of all rows before the specified row.
Parameters:
column(int, required): Zero-based column indexrow(int, required): Zero-based row index
Throws AssertionError if called before layout is complete.
Returns Offset representing the cell's top-left corner position.
Implementation
Offset getOffset(int column, int row) {
assert(_layoutResult != null, 'Layout result is not available');
return _layoutResult!.getOffset(column, row);
}