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