C++--如何实现SDI程序使用CSplitterWnd创建的多个视图的动态地显示和关闭视图

为了实现该功能我们需要对CSplitterWnd进行增强，具体实现如下：

一、定义头文件
//////////////////////////////////////////////////////////////////
//
// splitex.h
class CSplitterWndEx : public CSplitterWnd
{
protected:
int m_nHidedCol; // hide column number, -1 if all columns
// are shown

public:
CSplitterWndEx();

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

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CSplitterWndEx)
//}}AFX_VIRTUAL

// Generated message map functions
protected:
//{{AFX_MSG(CSplitterWndEx)
// NOTE - the ClassWizard will add and remove member
// functions here.
//}}AFX_MSG

DECLARE_MESSAGE_MAP()
};

二、具体实现代码
//////////////////////////////////////////////////////////////////
//
// splitex.cpp
#include "stdafx.h"
#include "splitex.h"

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

//////////////////////////////////////////////////////////////////
/
// CSplitterWndEx

CSplitterWndEx::CSplitterWndEx() :
m_nHidedCol(-1)
{
}

void CSplitterWndEx::ShowColumn()
{
ASSERT_VALID(this);
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);
pPaneShow->ShowWindow(SW_SHOWNA);

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;
RecalcLayout();
}

void CSplitterWndEx::HideColumn(int colHide)
{
ASSERT_VALID(this);
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);
pPaneHide->ShowWindow(SW_HIDE);
pPaneHide->SetDlgCtrlID(
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_nCols--;
m_pColInfo[m_nCols].nCurSize = m_pColInfo[colHide].nCurSize;
RecalcLayout();
}

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