DataBrowserTrackingProcPtr

DataBrowserTrackingProcPtr
Header:	ControlDefinitions.h		Carbon status:	Under Evaluation

typedef SInt16(* DataBrowserTrackingProcPtr) (
    ControlRef browser, 
    DataBrowserItemID itemID, 
    DataBrowserPropertyID property, 
    const Rect *theRect, 
    const EventRecord *event, 
    EventModifiers modifiers
);

You would declare your function like this if you were to name it MyDataBrowserTrackingCallback:

SInt16 MyDataBrowserTrackingCallback (
    ControlRef browser, 
    DataBrowserItemID itemID, 
    DataBrowserPropertyID property, 
    const Rect *theRect, 
    const EventRecord *event, 
    EventModifiers modifiers
);