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 (we couldn't delete it then, because we
* needed it at the top of the loop for this iteration)
*/
if (LastFoundObj) {
_wpDelete(LastFoundObj,0);
LastFoundObj = NULL;
} /* endif */
/* we want to 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, set our global flag */
if (_queryFirstViewHandle(somSelf) == NULLHANDLE) {
_setFirstViewHandle(somSelf, hwndFromParentOpen);
} /* endif */
return( hwndFromParentOpen );
}