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() > 0)
 {
  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