TCanvas.OnChange property

Declaration

property OnChange: TNotifyEvent read FOnChange write FOnChange;

Description

OnChange is a TNotifyEvent property which contains an event handler signalled after values in the canvas have been changed. The event handler is signalled (when assigned) from the Changed method, which is called when drawing operations are completed that alter the Pixels on the canvas.

Assign an object procedure to the property which implements the signature in TNotifyEvent to respond to the event notification.

Use OnChanging to respond to the notification that occurs prior to a drawing operation.

See also

• OnChanging