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Disable the childframe when open the main frame

Posted on 2001-06-06
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Last Modified: 2013-11-20
I want to know how to disable the childframe(MDI) when I open a mainframe. The childframe is open when only users are asked to choose the size for the childframe

thanks
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Question by:makoto_liang
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4 Comments
 
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Accepted Solution

by:
Meir Rivkin earned 200 total points
ID: 6158923
do u wanna disable the child frame or prevent from being created? ( untill they choose a size? )

anyway if i understand to prevent from creating or opening files do the follow:
m_bChildWndSizeIsValid: indicates if use chose a size for the child window

//mainFrm.h
bool m_bChildWndSizeIsValid;

     afx_msg void OnUpdateFileNew(CCmdUI* pCmdUI);
     afx_msg void OnUpdateFileOpen(CCmdUI* pCmdUI);

//mainFrm.cpp
in the MESSAGE_MAP add:
ON_UPDATE_COMMAND_UI(ID_FILE_NEW, OnUpdateFileNew)
ON_UPDATE_COMMAND_UI(ID_FILE_OPEN, OnUpdateFileOpen)

CMainFrame::CMainFrame()
{
     m_bChildWndSizeIsValid = false;    
}


void CMainFrame::OnUpdateFileOpen(CCmdUI* pCmdUI)
{
pCmdUI->Enable(m_bChildWndSizeIsValid);
}

void CMainFrame::OnUpdateFileNew(CCmdUI* pCmdUI)
{
pCmdUI->Enable(m_bChildWndSizeIsValid);
}


good luck

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LVL 42

Expert Comment

by:Meir Rivkin
ID: 6158954
another thing:,
go to OnNewDocument of your Doc class and change its implementation to this:

BOOL CMyDoc::OnNewDocument()
{
     if(((CMainFrame*)AfxGetMainWnd())->m_bChildWndSizeIsValid == true)
          if (!CDocument::OnNewDocument())
               return FALSE;

     return TRUE;
}

dont forget to declare the m_bChildWndSizeIsValid which is in the CMainFrame class, as public (or use function to retrieve this memebr such as IsChildWndSizeValid()...)

and also m_bChildWndSizeIsValid is set to be false in the cinstrauctor of the CManiFrame, don't forget to change it to true after the user choose a size.


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LVL 1

Expert Comment

by:Moondancer
ID: 6928658
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Expert Comment

by:Moondancer
ID: 7116234
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