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Set the CMiniDockFrame max and min track size info

Posted on 1997-03-07
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Last Modified: 2013-11-20
Hello,

I am trying to set the min and max tracking size for WM_GETMINMAXINFO when my dialog bar, which is derived from CDialogBar, is floating.  I tried subclassing to the CMiniDockFrameWnd to respond to the WM_GETMINMAXINFO but still does not work. CMiniDockFrameWnd is created automatically by Microsoft  when the dialog bar is floated inside the MFC source code BARDOCK.CPP.  When I ran my code, I do get the messages in the CMiniDockFrameWnd procedure that I have subclassed.  Can anyone help me?  Below is part of my code:
void CNewSldClass::StartFloating()
{
      //need to get the CMiniDockFrameWnd
      CWnd* pFrame = GetDockingFrame();
      m_OldMiniFrameProc = (WNDPROC)GetWindowLong(pFrame -> m_hWnd, GWL_WNDPROC);
      SetWindowLong(pFrame -> m_hWnd,GWL_USERDATA,(LONG)this);
      WNDPROC NewMiniFrameProc = (WNDPROC)CNewSldClass::SubclassMiniFrameProc;
      SetWindowLong (pFrame -> m_hWnd,GWL_WNDPROC,(LONG)NewMiniFrameProc);
}
LRESULT CALLBACK CNewSldClass::SubclassMiniFrameProc(HWND hWnd,UINT nMessage,WPARAM wParam,LPARAM lParam)
{
      CNewSldClass* pSldDlgBar = (CNewSldClass*)GetWindowLong(hWnd, GWL_USERDATA);
 
      switch (nMessage)
      {
            case WM_DESTROY:
                  MessageBeep(0);
            break;

            case WM_GETMINMAXINFO:
            {
                  MINMAXINFO FAR* lpMMI = (MINMAXINFO FAR*)lParam;
                  RECT rect = {0,0,80,70};
                  CWnd* pFrame = FromHandle(hWnd);
                  pFrame -> CalcWindowRect(&rect,0);
                  int iWd = rect.right - rect.left;
                  int iHt = rect.bottom - rect.top;
                lpMMI -> ptMinTrackSize.x = iWd;
                lpMMI -> ptMinTrackSize.y = iHt;
                  return 0L;
            }
            break;

            default:
                  return (CallWindowProc((pSldDlgBar -> m_OldMiniFrameProc), hWnd, nMessage, wParam, lParam));
            break;
      }
      return 0L;
}//endof SubclassMiniFrameProc
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Question by:jli
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1 Comment
 
LVL 23

Accepted Solution

by:
chensu earned 50 total points
ID: 1300222
When you subclass your CMiniDockFrame, you don't need to write so many codes. Instead, you can just override CMiniDockFrame::OnGetMinMaxInfo().

ON_WM_GETMINMAXINFO()

afx_msg void CMiniDockFrame::OnGetMinMaxInfo(MINMAXINFO FAR *lpMMI)
{
    if (bFloating)
    {
        RECT rect = {0,0,80,70};
        this->CalcWindowRect(&rect,0);
        int iWd = rect.right - rect.left;
        int iHt = rect.bottom - rect.top;
        lpMMI -> ptMinTrackSize.x = iWd;
        lpMMI -> ptMinTrackSize.y = iHt;
    }
}

This should work.

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