SE> How can I catch the DM_DRAGOVER when it is over a control or child
 SE> window of a dialogue window so that I can return DOR_DROP for that
 SE> button and not just for the background?

 CH> Subclass each control window.

Well, I did that (it was easier than I thought it would be :)) but I still
have a problem.

The DM_DRAGOVER message never seems to be recognized in the subclassed
window procedure.

In the following lstProc() is the old default window procedure for the
listbox (used in my tests) and the subclassing was done as:


lstProc=WinSubclassWindow(WinWindowFromID(hwnd,LIST),ListSubProc);


MRESULT EXPENTRY ListSubProc(HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2 )
{
   switch(msg) {
      case DM_DRAGOVER:
      {
         PDRAGINFO  pdinfo = (PDRAGINFO) mp1;
         PDRAGITEM  pditem = NULL;

         DrgAccessDraginfo(pdinfo);
         pditem = DrgQueryDragitemPtr(pdinfo, 0);
         if(DrgVerifyRMF(pditem, "DRM_OS2FILE", "DRF_TEXT")) {
            DrgFreeDraginfo (pdinfo) ;
            return(MRFROM2SHORT(DOR_DROP, DO_COPY));
         } else {
            DrgFreeDraginfo (pdinfo) ;
            return(MRFROM2SHORT(DOR_NEVERDROP, 0));
         }
      }

      case DM_DROP:
      {
         PDRAGINFO  pdinfo = (PDRAGINFO) mp1;
         PDRAGITEM  pditem = NULL;

         DrgAccessDraginfo(pdinfo);
         pditem = DrgQueryDragitemPtr(pdinfo, 0) ;
         DrgQueryStrName (pditem->hstrContainerName, CCHMAXPATH, tbuf);
         DrgQueryStrName (pditem->hstrSourceName, CCHMAXPATH,
&tbuf[strlen(tbuf)]);
         strupr(tbuf);
         WinSetWindowText(hwnd,tbuf);
         DrgFreeDraginfo (pdinfo) ;
         break;
      }
   }
   return (MRESULT)lstProc(hwnd, msg, mp1, mp2);
}


I have proven that the subclassed procedure is being called but the code
statements in the case of DM_DRAGOVER are never being executed.

Any thoughts?


Simon

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