MFC窗口和控件大小等比例变化

第一步：OnInitDialog里保存对话框及其所有子窗体的Rect区域

  CRect rect;

  GetWindowRect(&rect);

  listRect.AddTail(rect);//对话框的区域

  CWnd* pWnd = GetWindow(GW_CHILD);//获取子窗体

  while(pWnd)

  {

      pWnd->GetWindowRect(rect);//子窗体的区域

     m_listRect.AddTail(rect);           //CList<CRect,CRect> m_listRect成员变量

      pWnd = pWnd->GetNextWindow();//取下一个子窗体

  }

第二步：响应OnSize消息

  if (listRect.GetCount() > )

  {

   CRect dlgNow;

   GetWindowRect(&dlgNow);

   POSITION pos = listRect.GetHeadPosition();//第一个保存的是对话框的Rect

   CRect dlgSaved;

   dlgSaved = listRect.GetNext(pos);

   ScreenToClient(dlgNow);

   float x = dlgNow.Width() * 1.0 / dlgSaved.Width();//根据当前和之前保存的对话框的宽高求比例

   float y = dlgNow.Height()  *1.0/ dlgSaved.Height();

   ClientToScreen(dlgNow);

   CRect childSaved;

   CWnd* pWnd = GetWindow(GW_CHILD);

   while(pWnd)

   {

    childSaved = listRect.GetNext(pos);//依次获取子窗体的Rect

    childSaved.left = dlgNow.left + (childSaved.left - dlgSaved.left)*x;//根据比例调整控件上下左右距离对话框的距离

    childSaved.right = dlgNow.right + (childSaved.right - dlgSaved.right)*x;

    childSaved.top = dlgNow.top + (childSaved.top - dlgSaved.top)*y;

    childSaved.bottom = dlgNow.bottom + (childSaved.bottom - dlgSaved.bottom)*y;

    ScreenToClient(childSaved);

    pWnd->MoveWindow(childSaved);

    pWnd = pWnd->GetNextWindow();

   }

  }

  //Invalidate(); //强制重绘窗口