ddlTrackerCallback() - post tracker callback

ddlTrackerCallback() - post tracker callback
ddlTrackerCallback() - post tracker callback

Prototype:

   void ddlTrackerCallback(
      CONTROL *ctl,
      WtCastPtr UserWord; 
      void (*UserTracker)());

Description:

Posts a callback to perform tracker operation.

ddlTrackerCallback(ctl,UserWord,0) results in tracker callback being turned off.

Currently used by:

Callback Description:

The prototype for the tracker callback is:

void __stdcall UserTracker(
   WtCastPtr UserWord,      /* [IN] From ddlTrackerCallback() */
   WtInt32 indicator,       /* [IN] 1: initialize; 0: track; -1: terminate */
   WtChar8 *msg,            /* [IN] null-terminated message when indicator == 0 */
   WtInt32 top,             /* [IN] top of tracker fraction */
   WtInt32 bottom);         /* [IN] bottom of tracker fraction */

Values returned in Control Structure:

Control.Ans1	NA
Control.Ans2	Previous Tracker Callback pointer cast as (WtInt32)
Control.Ans3	Previous Tracker Callback UserWord cast as (WtInt32)
Control.Ans2L	Previous Tracker Callback pointer cast as (WtLong64)
Control.Ans3L	Previous Tracker Callback UserWord cast as (WtLong64)