FMX.StdActns.TCustomValueRange.BeforeChange
Delphi
property BeforeChange: TNotifyEvent read FBeforeChange write FBeforeChange;
C++
__property System::Classes::TNotifyEvent BeforeChange = {read=FBeforeChange, write=FBeforeChange};
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| event | public | FMX.StdActns.pas FMX.StdActns.hpp |
FMX.StdActns | TCustomValueRange |
Description
This event is fired before new values of the ValueRange properties become effective.
The BeforeChange event is fired before new values of the ValueRange properties (Value, Min, Max, ViewportSize, and Frequency) become effective. For example, Min still contains an old value, while the new value is kept only in the New.Min parameter. The BeforeChange event is fired if Tracking = True.