Show/Hide Static Panes

MFC static splitter windows have a significant limitation. Their panes can't be hidden or shown dynamically. To solve the problem I overrode the CSplitterWnd. The new class can hide a splitter window column. Sure, it's only one approach to the problem, but it's a good example anyway.

// splitex.h
// (c) 1997, Oleg G. Galkin

class CSplitterWndEx : public CSplitterWnd
   int m_nHidedCol;    // hide column number, -1 if all columns
                       // are shown


   void ShowColumn();
   void HideColumn(int colHide);

// ClassWizard generated virtual function overrides

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


// splitex.cpp
// (c) 1997, Oleg G. Galkin

#include "stdafx.h"
#include "splitex.h"

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

// CSplitterWndEx

CSplitterWndEx::CSplitterWndEx() :

void CSplitterWndEx::ShowColumn()
   ASSERT(m_nCols < m_nMaxCols);
   ASSERT(m_nHidedCol != -1);

   int colNew = m_nHidedCol;
   m_nHidedCol = -1;
   int cxNew = m_pColInfo[m_nCols].nCurSize;
   m_nCols++;    // add a column
   ASSERT(m_nCols == m_nMaxCols);

   // fill the hidden column
   int col;
   for (int row = 0; row < m_nRows; row++)
      CWnd* pPaneShow = GetDlgItem(
         AFX_IDW_PANE_FIRST + row * 16 + m_nCols);
      ASSERT(pPaneShow != NULL);

      for (col = m_nCols - 2; col >= colNew; col--)
         CWnd* pPane = GetPane(row, col);
         ASSERT(pPane != NULL);
         pPane->SetDlgCtrlID(IdFromRowCol(row, col + 1));

      pPaneShow->SetDlgCtrlID(IdFromRowCol(row, colNew));

   // new panes have been created -- recalculate layout
   for (col = colNew + 1; col < m_nCols; col++)
      m_pColInfo[col].nIdealSize = m_pColInfo[col - 1].nCurSize;
   m_pColInfo[colNew].nIdealSize = cxNew;

void CSplitterWndEx::HideColumn(int colHide)
   ASSERT(m_nCols > 1);
   ASSERT(colHide < m_nCols);
   ASSERT(m_nHidedCol == -1);
   m_nHidedCol = colHide;

   // if the column has an active window -- change it
   int rowActive, colActive;
   if (GetActivePane(&rowActive, &colActive) != NULL &&
       colActive == colHide)
      if (++colActive >= m_nCols)
         colActive = 0;
      SetActivePane(rowActive, colActive);

   // hide all column panes
   for (int row = 0; row < m_nRows; row++)
      CWnd* pPaneHide = GetPane(row, colHide);
      ASSERT(pPaneHide != NULL);
         AFX_IDW_PANE_FIRST + row * 16 + m_nCols);

      for (int col = colHide + 1; col < m_nCols; col++)
         CWnd* pPane = GetPane(row, col);
         ASSERT(pPane != NULL);
         pPane->SetDlgCtrlID(IdFromRowCol(row, col - 1));
   m_pColInfo[m_nCols].nCurSize = m_pColInfo[colHide].nCurSize;

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


  • Dr

    Posted by wang gang on 03/05/2015 06:42pm

    Very usefule!Thanks

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