Handling Events12

The PreviewEvent function is provided so that your preview component can do standard event filtering. See Inside Macintosh: Files for details on the standard dialog event filter function.

PreviewEvent

If your preview component handles events, the PreviewEvent function is called as appropriate.



 
pascal ComponentResult PreviewEvent (pnotComponent p, 

                                          EventRecord *e,

                                          Boolean *handledEvent);

p: Specifies your preview component. You obtain this identifier from the Component Manager's OpenComponent function. See the chapter "Component Manager" in Inside Macintosh: More Macintosh Toolbox for details.
e: Contains a pointer to the event structure for this operation.
handledEvent: Contains a pointer to a Boolean value. If you completely handle an event such as a mouse-down event or keystroke, you should set the handledEvent parameter to true . Otherwise, set it to false .