Changing views in CSplitterWnd

Posted on 1998-12-20
Last Modified: 2013-11-20
IN my app (SDI MFC app), I've got a splitter wnd with 2 views, left and right. The right view has got another splitter with 2 views, top and bottom. How can I switch the top or bottom view to other CFormView derived views, depending on menu items selected by the user? Left and right views are derived from CView. Top and bottom views are derived from CFormView.

// Create left and right view in CMainFrame

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
      if (!m_wndSplitter.CreateStatic(this,1,2))
            TRACE0("Failed to create left-right splitter window\n");
            return FALSE;

      if (!m_wndSplitter.CreateView(0,0,RUNTIME_CLASS(CViewLeft),CSize(58,0),pContext))
            TRACE0("Failed to create left view\n");
            return FALSE;
      if (!m_wndSplitter.CreateView(0,1,RUNTIME_CLASS(CViewRight),CSize(0,0),pContext))
            TRACE0("Failed to create right view\n");
            return FALSE;
      return TRUE;

// Create top and bottom views in CRightView

int CViewRight::OnCreate(LPCREATESTRUCT lpCreateStruct)
        pContext = (CCreateContext *)lpCreateStruct->lpCreateParams;
      if (CView::OnCreate(lpCreateStruct) == -1)
            return -1;
      if (!m_wndSplitter.CreateStatic(this,2,1))
            TRACE0("Failed to create the top-bottom splitter window\n");
            return FALSE;
            if (!m_wndSplitter.CreateView(0,0,RUNTIME_CLASS(CFormTop),CSize(0,130),pContext)) return FALSE;
            if (!m_wndSplitter.CreateView(1,0,RUNTIME_CLASS(CFormBottom),CSize(0,0),pContext)) return FALSE;

      return 0;
Question by:k9
LVL 12

Expert Comment

ID: 1326455
Hi! I think you must derive your own class from CSplitterWnd and add some functionality to manipulate splitter panes.
for example:
class CMySplitter:public CSplitterWnd
BOOL SubstitutePane(int row, int col, CRuntimeClass* pRuntime)

BOOL CMySplitter::SubstitutePane(int row, int col, CRuntimeClass* pRuntime)
int cxCur, cyCur, cxMin, cyMin;
GetRowInfo(row, cyCur, cyMin) ;
GetColumnInfo(col, cxCur, cxMin);
CSize sz(cxCur, cyCur);
if (!CreateView(row, col, pRuntime, sz, NULL))
    return FALSE

Author Comment

ID: 1326456
Thanks for getting back to me. Have previously tried DeleteView and CreateView to switch views. Proggie keeps falling over using above method. DeleteView works (proggie does not complain), but falls over as soon as you try CreateView for new view.

For interest:

Found different way from Ken C Len on

Create static splitter in CMainFrame as above. Derive CRightView from CFrameWnd. Create different CView/CFormView derived classes and create all views to be used in app in CRightView::OnCreateClient. Use ShowWindow(SW_SHOW) and ShowWindow(SW_HIDE) to hide and display views as needed. Couple of bugs in this implementation with CFormView derived classes.
LVL 12

Expert Comment

ID: 1326457
Ok. This way works only for static splitter not dynamic, due to splitter does not store pointers to the panes (he works with window child ID calculated from pane`s row and col).
I think to implement this way to the dynamic view you must dynamically change panes ID by ::SetWindowLong(pPane->m_hWnd, GWL_ID, uValue);
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LVL 12

Expert Comment

ID: 1326458
Can you send me sample code (to I try to resolve problem

Expert Comment

ID: 1326459
in this case ,
i recommend you write some extra code to implement the splitterBar and treat the two views as child.

if you work with Doc Templete change the view will be very hard.


Accepted Solution

appdev earned 400 total points
ID: 1326460
  This is a question that I answered recently...
Maybe, this is the way that you want to change the panes.
You can derive one class from CSplitterWnd.
This is the implementation file :

// Splitter.cpp : implementation file

#include "stdafx.h"              
#include "colf.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;

// CSplitter




BEGIN_MESSAGE_MAP(CSplitter, CSplitterWnd)
// NOTE - the ClassWizard will add and remove mapping macros here.

// CSplitter message handlers

BOOL CSplitter::ReplaceView(int row, int col, CRuntimeClass* pViewClass, SIZE size)
  CCreateContext context;
  BOOL bSetActive;
  //if ((GetPane(row,col)->IsKindOf(pViewClass))==TRUE)
    //   return FALSE;
   // Get pointer to CDocument object so that it can be used in the creation
   // process of the new view
   CDocument * pDoc= ((CView *)GetPane(0,0))->GetDocument();
   CView * pActiveView=GetParentFrame()->GetActiveView();
   if (pActiveView==NULL || pActiveView==GetPane(row,col))

    // set flag so that document will not be deleted when view is destroyed
    // Delete existing view
   ((CView *) GetPane(row,col))->DestroyWindow();
    // set flag back to default
    // Create new view                      
   CreateView(row,col,pViewClass,size, &context);
   CView * pNewView= (CView *)GetPane(row,col);
   if (bSetActive==TRUE)
   return TRUE;

   And this is the header file :

// Splitter.h : header file

// CSplitter frame with splitter

#ifndef __AFXEXT_H__
#include <afxext.h>

class CSplitter : public CSplitterWnd
public: //protected:
CSplitter();           // protected constructor used by dynamic creation

// Attributes

// Operations
BOOL ReplaceView(int row, int col, CRuntimeClass* pViewClass, SIZE size);

// Overrides
// ClassWizard generated virtual function overrides

// Implementation
virtual ~CSplitter();

// Generated message map functions
// NOTE - the ClassWizard will add and remove member functions here.


   Now, in your mainframe class add a member variable, this way :

CSplitter m_wndSplitter;

   Add the WM_CREATE message in the Class Wizard.    

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/,
CCreateContext* pContext)
// create splitter window
if (!m_wndSplitter.CreateStatic(this, 2, 1))
return FALSE;

if (!m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CMyUpView), CSize(200, 100), pContext) ||
!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CMyDownView), CSize(50, 50), pContext))
return FALSE;

return TRUE;

   You can change any view when you want it...
e.g. when the user double click on your View...

CMyUpView::OnDblclk(NMHDR* pNMHDR, LRESULT* pResult)
   ...maybe code to check the place (coordinates, item, etc) of the double click...

   SIZE size;;;
   ((CSplitter *)GetParent())->ReplaceView(1,0,RUNTIME_CLASS(CMyDownView), size);
    ((CSplitter *)GetParent())->ReplaceView(1,0,RUNTIME_CLASS(CBlankView), size);


Hope this help you.


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