MFC窗口和控件大小等比例变化

第一步：在头文件中添加成员变量CList<CRect,CRect&> m_listRect;
第二步：OnInitDialog里保存对话框及其所有子窗体的Rect区域

CRect rect;
  GetWindowRect(&rect);
  m_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
  }

第三步：在类向导里面（Ctrl+W），为窗体添加消息WM_SIZE的响应函数OnSize(）；

第四步：响应OnSize消息

CDialog::OnSize(nType, cx, cy);

// TODO: Add your message handler code here
if (m_listRect.GetCount() > 0)
{
  CRect dlgNow;
  GetWindowRect(&dlgNow);
  POSITION pos = m_listRect.GetHeadPosition();//第一个保存的是对话框的Rect
  
  CRect dlgSaved;
  dlgSaved = m_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 = m_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();
  }
}