TFieldGetTextEvent is the type for event handlers that assign a field's value from a string.
TFieldGetTextEvent = procedure (Sender: TField; var Text: string; DisplayText: Boolean) of object;
(Sender: TField; var Text: string; DisplayText: Boolean) ( TFieldGetTextEvent)();
Sender is the field whose value the event handler supplies.
Text returns a string that represents the field's value.
DisplayText is true if the field's value is to be used for display only; false if the string is to be used for editing the field's value.
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