RAD Studio VCL Reference
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TAggregate.OnUpdate Event

Occurs when the value of the aggregate is recalculated.

Pascal
property OnUpdate: TAggUpdateEvent;
C++
__property TAggUpdateEvent OnUpdate;

Write an OnUpdate event handler to respond when the aggregate value is recomputed. For example, write code in an OnUpdate event handler to invalidate any controls that display the value of the aggregate so that they can repaint with the new value. 

 

Value 

InUse 

Invalidate

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