Re: How to reorder MDI documents gracefully?

Ajay Kalra <>
Tue, 25 Nov 2008 07:45:20 -0800 (PST)
On Nov 22, 3:35 pm, Bruce L <> wrote:

On Nov 21, 8:41 pm, Joseph M. Newcomer <> wrote:

What do you mean by "reorder"? Z-axis positioning? That should be=


SetWindowPos should do the job.

On Fri, 21 Nov 2008 18:07:01 -0800 (PST), Bruce L <Bruce.Lam...@gmail.c=

om> wrote:


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 defin=


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 n=


   // desired order (add docs back to cdt in this order too)

   CDocTemplate *cdt = theApp.pHDRTemplate; //GetNextDocTemplat=


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

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

ist->GetItemText(n, 0);

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


                   if (pathname == path2)
           POSITION vp = before[pos]->GetFirstViewPosit=


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





Does anyone know of a better way to do this?

Any help much appreciated...


Joseph M. Newcomer [MVP]
MVP Tips:

Yes I did mean change Z-order,

Unfortunately its not called ChangeZOrder... And then there is tab
order which is same Z order... :-)


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