如何实现点一下对话框外面的区域,自动隐藏对话框?

清泛编译
43.如何实现点一下对话框外面的区域,自动隐藏对话框?

 [问题提出]
  如果想在点击对话框外面的地方使得对话框关闭,该如何做?

 [解决方法]
  试试下面的代码,原理是在激活对话框时,捕获鼠标的动作,当鼠标点击时判断是否点击在对话框外,是的话就释放对话框.

 [程序实现]
  建立名为My的对话框程序.实现如下步骤:
  在MyDlg.h中加入:

  class CShowWindow1Dlg : public CDialog
  {
   // Construction
   public:
     int m_cx;
     int m_cy;
     ......
  };

  在MyDlg.cpp中:

  //定义消息映象,处理鼠标单击及激活
  BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
    //{{AFX_MSG_MAP(CMyDlg)
    ON_WM_LBUTTONDOWN()
    ON_WM_ACTIVATE()
    //}}AFX_MSG_MAP
  END_MESSAGE_MAP()

  void CMyDlg::OnLButtonDown(UINT nFlags, CPoint point)
  {
    CRect rect;
    GetClientRect(&rect);
    rect.InflateRect(m_cx, m_cy);
 
    //Release dialog if the user click outside it.
    if(!rect.PtInRect(point))
    {
      EndDialog(IDCANCEL);
    }

    CDialog::OnLButtonDown(nFlags, point);
  }

  void CMyDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized)
  {
    CDialog::OnActivate(nState, pWndOther, bMinimized);

    if( nState == WA_ACTIVE || nState == WA_CLICKACTIVE)
      SetCapture();
    else
      ReleaseCapture();
  }

  BOOL CMyDlg::OnInitDialog()
  {
    CDialog::OnInitDialog();
    .....
    
    OSVERSIONINFO info;
    memset((char*)&info, 0, sizeof(OSVERSIONINFO));
    info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if(GetVersionEx(&info))
    { //we don't run on Win32s, so check only two values
      if(info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
      { //On windows 95
       m_cx = GetSystemMetrics(SM_CXFIXEDFRAME);
       m_cy = GetSystemMetrics(SM_CYFIXEDFRAME);
      }
      else
      { //On NT
       m_cx = GetSystemMetrics(SM_CXDLGFRAME);
       m_cy = GetSystemMetrics(SM_CYDLGFRAME);
      }
    }
  }

   说明:
    1)WM_ACTIVATE消息在ClassWizard中没有,按如下步骤添加,右击CMyDlg类,选Add Windows Message Handle,接着在Filter for messages available to中选Window,在New Windows messages/events列表中就会出现WM_ACTIVATE,选中,点击Add Handler
   2)SM_CXDLGFRAME,SM_CYDLGFRAME  NT中取得有WS_DLGFRAMEstyle风格的窗口的高和宽 95中已经废弃而采用SM_CX_FIXEDFRAME和SM_CYFIXEDFRAME

本文导航

MFC 总结 技巧

分享到:
评论加载中,请稍后...
App Inventor 2 中文网,少儿编程首选平台!
回到顶部