TDataSet.OnCalcFields property
Event triggered when values for calculated fields must be computed.
Declaration
property OnCalcFields: TDataSetNotifyEvent read FOnCalcFields write FOnCalcFields;Description
OnCalcFields is triggered whenever the dataset needs to (re)compute the values of any calculated fields in the
dataset. It is called very often, so this event should return as quickly as possible. Only the values of the calculated fields
should be set, no methods of the dataset that change the data or cursor position may be called during the execution of this event handler.
The frequency with which this event is called can be controlled through the
AutoCalcFields property.
Note that the value of lookup fields does not need to be calculated in this event, their value is computed automatically
before this event is triggered.See also
- AutoCalcFields
- Kind
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.