Re: How to reorder MDI documents gracefully?

Hi,

I have been grappling with this for a while and can't find any other
solutions out there yet. Hopefully some kind reader will know of some
better way to do this...

I have an image-viewer MDI app where each (derived) CDocument holds a
single (derived) CView (one view = 1 image). I have keystrokes defined
in CView::OnKeyDown so that the 'Page Up' & 'Page Down' keys cause the
next/previous image to be displayed. I also have a custom CListCtrl in
a pop-up dialog which displays the list of images currently open and
allows the order of the images in the list to be changed. However I
can't find a decent way to get this reorder to propagate back to the
actual displayed image windows. I managed to hack a way that works but
it's unacceptably slow. What I do is minimize all the open windows in
the old order, remove all the CDocuments from the CDocTemplate, then
restore them one at a time in the new order adding the CDocs back to
the CDocTemplate. As you can imagine, with say 20 images open and XPs
slick animation effects (!), this takes a good 5 seconds, when really
I would just like to shortcut to having the reordered CDocument jump
into it's new position.

My current reordering strategy code:
------------------------------------------------------------------------=

void CMainFrame::ReorderImages(CListCtrl* imgList) {

   // change ordering of windows in an MDIFrameWnd by minimizing
   // all windows, removing docs from cdt then restoring in the new
   // desired order (add docs back to cdt in this order too)

   CDocTemplate *cdt = theApp.pHDRTemplate; //GetNextDocTemplate(=

   POSITION p = cdt->GetFirstDocPosition();
   std::vector<CDoc* > before;// = new CDoc*[GetDocCount()];
   while (p) {
           CDoc *cd = (CDoc *) cdt->GetNextDoc(p);
           before.push_back(cd);
           POSITION vp = cd->GetFirstViewPosition();
           CView* v = (CView* )cd->GetNextView(vp);
           v->GetParent()->ShowWindow(SW_SHOWMINIMIZED);
           cdt->RemoveDocument(cd);
   }

   CString pathname, path2;
   int pos;
   for (int n = before.size()-1; n >= 0; n--) {
           pathname = imgList->GetItemText(n, 1) + imgLis=

           pos = 0;
           while (pos < before.size()) {
                   path2 = before[pos]->GetPathNa=

                   if (pathname == path2)
                           break;
                   pos++;
           }
           cdt->AddDocument(before[pos]);
           POSITION vp = before[pos]->GetFirstViewPositio=

           CView* v = (CView* )before[pos]->GetNextView(v=

           v->GetParent()->ShowWindow(SW_RESTORE);
   }

}
------------------------------------------------------------------------=

Does anyone know of a better way to do this?

Any help much appreciated...

Bruce