[lazarus] Progress

[Jeff Wormsley]

On 9/2/99, at 11:51 AM, Michael A. Hess wrote: 

>No it doesn't. The GTK NEVER sends any messages to the LCL. All it ever
>does is call a callback routine after the event has been handled and
>then if and only if a callback has been assigned to the widget for that
>event. 

Does this mean an application can never prevent an event from being serviced?  Are there any equivalents to "Before" events?  Like a callback that is called before the widget does something, that can return something that prevents or allows the widget to act on the event?  Or are all of the callbacks always "After" the fact?
 
Jeff.