TTMSFNCCustomDataGrid.ColumnCustomCalculation Method
Computes a custom aggregate for a column.
API unit family: TMSFNCDataGrid
Declaring type: TTMSFNCCustomDataGrid
Syntax
function ColumnCustomCalculation(AColumn: Integer; ACustomCalculationCallback: TTMSFNCDataGridDataCustomColumnCalculationCallback = nil; AFromRow: Integer = -1; AToRow: Integer = -1): Double;
double __fastcall ColumnCustomCalculation(int AColumn, Fmx::Tmsfncdatagriddata::_di_TTMSFNCDataGridDataCustomColumnCalculationCallback ACustomCalculationCallback = Fmx::Tmsfncdatagriddata::_di_TTMSFNCDataGridDataCustomColumnCalculationCallback(), int AFromRow = 0xffffffff, int AToRow = 0xffffffff);
Remarks
When either bound is -1, the range passed on is the rows between the fixed top and fixed bottom rows. The callback is responsible for iterating the rows.
Parameters
| Name | Description |
|---|---|
AColumn |
Zero-based column index. |
ACustomCalculationCallback |
Function called once with (AColumn, ALevel, AFromRow, AToRow) that returns the result; ALevel is 0. When nil, the OnCustomColumnCalculation event is used instead. |
AFromRow |
First row to include, or -1 for the whole data range. |
AToRow |
Last row to include, or -1 for the whole data range. |
Returns
The value returned by the callback or event handler.