Dialog & Windows

11.响应对话框的最大化、最小化、关闭、恢复事件
     方法一：添加 WM_SYSCOMMAND 消息映射函数

     void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)
     {
          if ( (nID & 0xFFF0) == IDM_ABOUTBOX )
          {
               CAboutDlg dlgAbout;
               dlgAbout.DoModal();
      }
     else
     {
          if ( nID == SC_MAXIMIZE )
          {
               AfxMessageBox(_T("最大化"));
          }
          else if ( nID == SC_MINIMIZE )  
          {
               AfxMessageBox(_T("最小化"));
          }
          else if ( nID == SC_CLOSE )
          {
               AfxMessageBox(_T("关闭"));
          }

          CDialog::OnSysCommand(nID, lParam);
    }

     方法二：添加 WM_SIZE 消息映射函数

     void CTest6Dlg::OnSize(UINT nType, int cx, int cy)
     {
          CDialog::OnSize(nType, cx, cy);

          if ( nType == SIZE_MAXIMIZED )
          {
               AfxMessageBox(_T("最大化"));
          }
          else if ( nType == SIZE_MINIMIZED )
          {
               AfxMessageBox(_T("最小化"));
          }  
          else if ( nType == SIZE_RESTORED )
          {
               AfxMessageBox(_T("恢复"));
          }
     }

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12.代码实现窗口最小化，最大化，关闭

PostMessage(WM_SYSCOMMAND,  SC_MINIMIZE);
PostMessage(WM_SYSCOMMAND,  SC_MAXIMIZE);
PostMessage(WM_SYSCOMMAND,  SC_CLOSE);

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13.按下ESC和ENTER键时禁止关闭对话框

   
    方法一：

     (1) 重载OnCancel和OnOk，屏蔽其中的CDialog::OnCancel()和CDialog::OnOk();
     (2) 添加以下代码 
     void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)
     {
         if ((nID & 0xFFF0) == IDM_ABOUTBOX)
          {
             CAboutDlg dlgAbout;   //if you have an about dialog
              dlgAbout.DoModal();
          }
          else if ((nID & 0xFFF0) == SC_CLOSE)
          {
              //用户点击右上角"X"
              EndDialog(IDOK);  
       
          }
          else
          {
              CDialog::OnSysCommand(nID, lParam);
          }
     }

    方法二：

     BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)
     {
          if ( pMsg->message == WM_KEYDOWN )
          {
               switch(pMsg->wParam)
               {
               case VK_ESCAPE:
                return TRUE; //直接返回TRUE
                break;
               case VK_RETURN:
                return TRUE;
                break;
               }
          }
          return CDialog::PreTranslateMessage(pMsg);
     }

     方法三：
         Q122489：
         How to Disable Default Pushbutton Handling for MFC Dialog
         http://support.microsoft.com/kb/122489/en-us

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14.在对话框中处理键盘鼠标消息

处理PreTranslateMessage消息

以下代码示例只演示了键盘WM_KEYDOWN消息，你也可以处理鼠标消息，比如WM_LBUTTONDOWN,WM_LBUTTONUP,WM_RBUTTONDOWN等。

BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)  
{ 
    /**********************************************************/
    /*    当焦点在combobox(drop down风格)的edit上,响应回车            */ 
    /***********************************************************/ 
    if ( pMsg->message == WM_KEYDOWN ) 
    {         
        switch( pMsg->wParam ) 
        { 
        case VK_RETURN: 
            CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD); 
            if(pMsg->hwnd == pEdit->m_hWnd ) 
            {  
                 AfxMessageBox("在combobox的edit中按下了Enter!"); 
            }             
            return TRUE; 
        } 
    } 
 
    /****************************************/ 
    /*   ALT为WM_SYSKEYDOWN                  */ 
    /****************************************/
    if( pMsg->message == WM_SYSKEYDOWN ) 
    {    
        switch( pMsg->wParam ) 
        { 
        case VK_F1:     
            if(::GetKeyState(VK_MENU) < 0)//ALT+F1
            { 
                AfxMessageBox("按下了ALT+F1"); 
                return TRUE; 
            }             
        }         
    } 
    
    /****************************************/ 
    /*     在clistctrl中按ctrl+A选中所有项  */ 
    /****************************************/ 
    if( pMsg->message == WM_KEYDOWN ) 
    {    
        if(pMsg->hwnd == GetDlgItem(IDC_LIST1)->m_hWnd) 
        { 
            switch( pMsg->wParam ) 
            { 
            case 65://A     
              if(::GetKeyState(VK_CONTROL) < 0)//Shift+enter 
              { 
                    for(int i=0; i<m_list.GetItemCount(); i++) 
                    { 
                        m_list.SetItemState(i, LVIS_SELECTED|LVIS_FOCUSED, 
                                            LVIS_SELECTED|LVIS_FOCUSED); 
                    } 
              } 
              return TRUE; 
            } 
        } 
    }  
 
    /****************************************/ 
    /*    当焦点在combobox,弹出自定义菜单   */ 
    /****************************************/      
    if(pMsg->message == WM_RBUTTONDOWN) 
    { 
        CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD); 
        if(pMsg->hwnd == pEdit->m_hWnd) 
        { 
            DWORD dwPos = GetMessagePos(); 
            CPoint point( LOWORD(dwPos), HIWORD(dwPos) ); 
            ScreenToClient(&point); 
            ClientToScreen(&point); 
             
            CMenu menu; 
            VERIFY( menu.LoadMenu( IDR_MENU1 ) ); 
            CMenu* popup = menu.GetSubMenu(0); 
            ASSERT( popup != NULL ); 
            popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this ); 
        }         
    } 
 
    return CDialog::PreTranslateMessage(pMsg); 
}

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15.对话框启动即隐藏

 
    添加 WM_SHOWWINDOW 的消息映射

     void CTest6Dlg::OnShowWindow(BOOL bShow, UINT nStatus)
     {
          if ( GetStyle() & WS_VISIBLE )
          {
               CDialog::OnShowWindow(bShow, nStatus);
          }
          else
          {
               long Style = ::GetWindowLong(*this, GWL_STYLE);
               ::SetWindowLong(*this, GWL_STYLE, Style | WS_VISIBLE);
               CDialog::OnShowWindow(SW_HIDE, nStatus);
          }
     }

---

16.对话框自动停靠在屏幕边

    const int DETASTEP = 50;
     BOOL AdjustPos(CWnd *pWnd, CRect* lpRect)
     {
        //自动靠边
        int iSX = GetSystemMetrics(SM_CXFULLSCREEN);
        int iSY = GetSystemMetrics(SM_CYFULLSCREEN);
        RECT rWorkArea;
        BOOL bResult = SystemParametersInfo(SPI_GETWORKAREA, sizeof(RECT), &rWorkArea, 0);

        CRect rcWA;
        if ( !bResult )
        {
            //如果调用不成功就利用GetSystemMetrics获取屏幕面积
            rcWA = CRect(0,0,iSX,iSY);
        }
        else
            rcWA = rWorkArea;

        int iX = lpRect->left;
        int iY = lpRect->top;
        if ( iX < rcWA.left + DETASTEP && iX!=rcWA.left )
        {
            //调整左
            pWnd->SetWindowPos(NULL,rcWA.left,iY,0,0,SWP_NOSIZE);
            lpRect->OffsetRect(rcWA.left-iX,0);
            AdjustPos(lpRect);
            return TRUE;
        }
        if ( iY < rcWA.top + DETASTEP && iY!=rcWA.top )
        {
            //调整上
            pWnd->SetWindowPos(NULL ,iX,rcWA.top,0,0,SWP_NOSIZE);
            lpRect->OffsetRect(0,rcWA.top-iY);
            AdjustPos(lpRect);
            return TRUE;
        }
        if ( iX + lpRect->Width() > rcWA.right - DETASTEP && iX !=rcWA.right-lpRect->Width() )
        {
            //调整右
            pWnd->SetWindowPos(NULL ,rcWA.right-rcW.Width(),iY,0,0,SWP_NOSIZE);
            lpRect->OffsetRect(rcWA.right-lpRect->right,0);
            AdjustPos(lpRect);
            return TRUE;
        }
        if ( iY + lpRect->Height() > rcWA.bottom - DETASTEP && iY !=rcWA.bottom-lpRect->Height() )
        {
            //调整下
            pWnd->SetWindowPos(NULL ,iX,rcWA.bottom-rcW.Height(),0,0,SWP_NOSIZE);
            lpRect->OffsetRect(0,rcWA.bottom-lpRect->bottom);
            return TRUE;
        }
        return FALSE;
    }

    //然后在ONMOVEING事件中使用如下过程调用
    CRect r=*pRect;
    AdjustPos(this, &r);
    *pRect=(RECT)r;

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17.单击窗口任意位置都可拖动窗口

    方法一：
     添加 WM_LBUTTONDOWN 的消息映射
     void CTest6Dlg::OnLButtonDown(UINT nFlags, CPoint point)
     {
          PostMessage(WM_NCLBUTTONDOWN, HTCAPTION, 0);

          CDialog::OnLButtonDown(nFlags, point);
     }

    方法二：
    添加 WM_NCHITTEST 的消息映射
    注意：在classwizard->message中找不到WM_NCHITTEST的，需要在选项卡class info->message filter中选择window后该消息才会出现在message中。
      void CTest6Dlg::OnNCHitTest(CPoint point)
     {
            return HTCAPTION;
      //    return CDialog::OnNCHitTest(point);
     }

     或者参考
        http://msdn.microsoft.com/msdnmag/issues/02/12/CQA/default.aspx

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18.用Enter键替换Tab键实现焦点切换

     BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)
     {
        if ( pMsg->message == WM_KEYDOWN )
          {
              if ( pMsg->wParam == VK_RETURN )
                   pMsg->wParam = VK_TAB;
          } 
          return CDialog::PreTranslateMessage(pMsg);
     } 

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19.在对话框添加快捷键

     (1) 在CXXXApp中类中添加声明
        HACCEL m_haccel;
     (2) 在resource view中右键点击树的根目录，选择insert，添加一个新的Accelerator，默认ID为IDR_ACCELERATOR1。
         在其中添加相应菜单的快捷键。
     (3) 在BOOL CXXXApp::InitInstance()中添加代码
        m_haccel = LoadAccelerators(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_ACCELERATOR1));
     (4) 添加CXXXApp类的 ProcessMessageFilter 消息映射函数
         BOOL CTest6App::ProcessMessageFilter(int code, LPMSG lpMsg)
         {
              if ( m_haccel )
              {
                  if ( ::TranslateAccelerator(m_pMainWnd->m_hWnd, m_haccel, lpMsg) )
                       return TRUE;
              }
              return CWinApp::ProcessMessageFilter(code, lpMsg);
         }

或者参考
Q100770：
How to use accelerator keys and a main menu on the dialog box in Visual C++
http://support.microsoft.com/kb/100770/en-us

Adding Hot Keys to your Application
http://msdn.microsoft.com/msdnmag/issues/1200/c/default.aspx

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20.对话框全屏

    int cx, cy;
    HDC dc = ::GetDC(NULL);
    cx = GetDeviceCaps(dc,HORZRES) + GetSystemMetrics(SM_CXBORDER);
    cy = GetDeviceCaps(dc,VERTRES) + GetSystemMetrics(SM_CYBORDER);
    ::ReleaseDC(0,dc);

    // Remove caption and border
    SetWindowLong(m_hWnd, GWL_STYLE,
                    GetWindowLong(m_hWnd, GWL_STYLE) & (~(WS_CAPTION | WS_BORDER)));

    // Put window on top and expand it to fill screen
    ::SetWindowPos(m_hWnd, HWND_TOPMOST,
          -(GetSystemMetrics(SM_CXBORDER)+1),
          -(GetSystemMetrics(SM_CYBORDER)+1),
          cx+1,cy+1, SWP_NOZORDER);
    或参考
        http://www.codeguru.com/cpp/w-d/dislog/dialog-basedapplications/article.php/c1837/