wpPopulate - Example Code

This example performs special processing upon first opening a folder.

SOM_Scope HWND SOMLINK myfold_wpOpen(MYFOLDER *somSelf,
                                     HWND hwndCnr,
                                     ULONG ulView,
                                     ULONG param)

{
  HWND hwndFromParentOpen = NULLHANDLE;
  MYFOLDERData *somThis = MYFOLDERGetData(somSelf);
  MYFOLDERMethodDebug("MYFOLDER","myfold_wpOpen");

  if (_queryFirstViewHandle(somSelf) == NULLHANDLE)
  {
    /* ONLY do this on FIRST open of the folder */
    if (_wpPopulate(somSelf, NULLHANDLE, NULL, FALSE))
    {
      WPObject *Obj;
      WPObject *LastFoundObj = NULL;
       /* Check contents of folder and see which are instances of  */
       /* WPFolder, we'll delete any WPFolders as a cleanup step   */
       for (Obj = _wpQueryContent(somSelf,NULL,(ULONG)QC_First);
       Obj;
       Obj = _wpQueryContent(somSelf, Obj, (ULONG) QC_Next))

       {
         /* Delete the last object found on the previous iteration */
         /* of the loop.  It couldn't be deleted then, because it  */
         /* was needed at the top of the loop for this iteration.  */
         if (LastFoundObj)
         {
           _wpDelete(LastFoundObj,0);
           LastFoundObj = NULL;
         } /* endif */

         /* Make sure that all previously existing folders */
         /* are deleted                                    */
         if (_somIsA(Obj, _WPFolder))
         {
           LastFoundObj = Obj;
         }  /* endif */
       }  /* endfor */

       /* If there is still one object left to delete, do it now */
       if (LastFoundObj)
       {
         _wpDelete(LastFoundObj,0);
         LastFoundObj = NULL;
       } /* endif */
     } /* end if populate */
   } /* end if first open */

   /* Show the opened folder */
   hwndFromParentOpen = parent_wpOpen(somSelf, hwndCnr, ulView, param);

   /* If this is the first open folder, set the global flag */
   if (_queryFirstViewHandle(somSelf) == NULLHANDLE)
   {
     _setFirstViewHandle(somSelf, hwndFromParentOpen);
   } /* endif */
   return(hwndFromParentOpen);
}