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
显示代码打印01 //////////////////////////////////////////////////////////////////
02 //
03 // splitex.h
04 class CSplitterWndEx : public CSplitterWnd
05 {
06 protected:
07 int m_nHidedCol; // hide column number, -1 if all columns
08 // are shown
09
10 public:
11 CSplitterWndEx();
12
13 void ShowColumn();
14 void HideColumn(int colHide);
15
16 // ClassWizard generated virtual function overrides
17 //{{AFX_VIRTUAL(CSplitterWndEx)
18 //}}AFX_VIRTUAL
19
20 // Generated message map functions
21 protected:
22 //{{AFX_MSG(CSplitterWndEx)
23 // NOTE - the ClassWizard will add and remove member
24 // functions here.
25 //}}AFX_MSG
26
27 DECLARE_MESSAGE_MAP()
28 };
二、具体实现代码
显示代码打印001 //////////////////////////////////////////////////////////////////
002 //
003 // splitex.cpp
004 #include "stdafx.h"
005 #include "splitex.h"
006
007 #ifdef _DEBUG
008 #define new DEBUG_NEW
009 #undef THIS_FILE
010 static char THIS_FILE[] = __FILE__;
011 #endif
012
013 //////////////////////////////////////////////////////////////////
014 /
015 // CSplitterWndEx
016
017 CSplitterWndEx::CSplitterWndEx() :
018 m_nHidedCol(-1)
019 {
020 }
021
022 void CSplitterWndEx::ShowColumn()
023 {
024 ASSERT_VALID(this);
025 ASSERT(m_nCols < m_nMaxCols);
026 ASSERT(m_nHidedCol != -1);
027
028 int colNew = m_nHidedCol;
029 m_nHidedCol = -1;
030 int cxNew = m_pColInfo[m_nCols].nCurSize;
031 m_nCols++; // add a column
032 ASSERT(m_nCols == m_nMaxCols);
033
034 // fill the hidden column
035 int col;
036 for (int row = 0; row < m_nRows; row++)
037 {
038 CWnd* pPaneShow = GetDlgItem(
039 AFX_IDW_PANE_FIRST + row * 16 + m_nCols);
040 ASSERT(pPaneShow != NULL);
041 pPaneShow->ShowWindow(SW_SHOWNA);
042
043 for (col = m_nCols - 2; col >= colNew; col--)
044 {
045 CWnd* pPane = GetPane(row, col);
046 ASSERT(pPane != NULL);
047 pPane->SetDlgCtrlID(IdFromRowCol(row, col + 1));
048 }
049
050 pPaneShow->SetDlgCtrlID(IdFromRowCol(row, colNew));
051 }
052
053 // new panes have been created -- recalculate layout
054 for (col = colNew + 1; col < m_nCols; col++)
055 m_pColInfo[col].nIdealSize = m_pColInfo[col - 1].nCurSize;
056 m_pColInfo[colNew].nIdealSize = cxNew;
057 RecalcLayout();
058 }
059
060 void CSplitterWndEx::HideColumn(int colHide)
061 {
062 ASSERT_VALID(this);
063 ASSERT(m_nCols > 1);
064 ASSERT(colHide < m_nCols);
065 ASSERT(m_nHidedCol == -1);
066 m_nHidedCol = colHide;
067
068 // if the column has an active window -- change it
069 int rowActive, colActive;
070 if (GetActivePane(&rowActive, &colActive) != NULL &&
071 colActive == colHide)
072 {
073 if (++colActive >= m_nCols)
074 colActive = 0;
075 SetActivePane(rowActive, colActive);
076 }
077
078 // hide all column panes
079 for (int row = 0; row < m_nRows; row++)
080 {
081 CWnd* pPaneHide = GetPane(row, colHide);
082 ASSERT(pPaneHide != NULL);
083 pPaneHide->ShowWindow(SW_HIDE);
084 pPaneHide->SetDlgCtrlID(
085 AFX_IDW_PANE_FIRST + row * 16 + m_nCols);
086
087 for (int col = colHide + 1; col < m_nCols; col++)
088 {
089 CWnd* pPane = GetPane(row, col);
090 ASSERT(pPane != NULL);
091 pPane->SetDlgCtrlID(IdFromRowCol(row, col - 1));
092 }
093 }
094 m_nCols--;
095 m_pColInfo[m_nCols].nCurSize = m_pColInfo[colHide].nCurSize;
096 RecalcLayout();
097 }
098
099 BEGIN_MESSAGE_MAP(CSplitterWndEx, CSplitterWnd)
100 //{{AFX_MSG_MAP(CSplitterWndEx)
101 // NOTE - the ClassWizard will add and remove mapping macros here.
102 //}}AFX_MSG_MAP
103 END_MESSAGE_MAP()
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