Re: CFrameWnd, CSplitterWnd, CView

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 23 May 2006 10:45:32 -0400

Message-ID:

<#YMtHenfGHA.3572@TK2MSFTNGP04.phx.gbl>

asterisc wrote:

There are two ways to switch views in SDI:

1. Create and destroy

2. Show and hide

How can i show-hide a splitter? (not by makeing one pane size = 0!)

If the splitter is in the CMainFrame, there is no option to
destory-create, because it must be created on the: OnCreateClient()
function of the CMainFrame.

Can you please be more specific?

asterisc:

View/spiltters do not "have" to be created in OnCreateClient(). Only the
initially displayed view/splitter needs to be.

But, really, show/hide is the easier way to go. In this case you do
create all the views/splitters in OnCreateClient(). The initially
displayed view/splitter should have the id AFX_IDW_PANE_FIRST, and the
others AFX_IDW_PANE_FIRST+1, etc.

This is the code I use to switch between views or splitters (it makes no
difference which):

int CMainFrame::SetClient(int nNew)
{
   // select new active client (view or splitter)
   // returns previous index
   // m_pViewWnd is an array of CWnd pointers
   // m_nClientIndex holds the currently selected index

   int nOld=m_nClientIndex;
   if(nNew == nOld)
   {
     return nOld;
   }

   CWnd* pOld = m_pViewWnd[nOld];
   CWnd* pNew = m_pViewWnd[nNew];

   UINT iOld = ::GetWindowLong(pOld->m_hWnd, GWL_ID);
   UINT iNew = ::GetWindowLong(pNew->m_hWnd, GWL_ID);

   ::SetWindowLong(pOld->m_hWnd, GWL_ID, iNew);
   ::SetWindowLong(pNew->m_hWnd, GWL_ID, iOld);

   pOld->ShowWindow(SW_HIDE);
   pNew->ShowWindow(SW_SHOW);

   m_nClientIndex = nNew;
   RecalcLayout();
   pNew->Invalidate();
   return nOld;
}

In my specific application, there are two clients. Index 0 is a view and
index 1 is a splitter, containing two views. IMO, you can make the whole
thing more OOP correct if you use a derived splitter class that creates
its own views internally, but this is not necesssary.

David Wilkinson