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📁 随书类文件![随书类]MFC_SOURCEBOOK
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   <TITLE>Toolbar - Custom status messages and tooltips</TITLE>
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<FONT COLOR="#AOAO99">Toolbar - Custom status messages and tooltips</FONT></H3></CENTER>

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<H3><HR></H3></CENTER>

This article was contributed by <A HREF="mailto:pal.k.tonder@matek.sintef.no">P錶 K. T鴑der</A>

<P>By default MFC uses string resources with the same ID as
the toolbar buttons for status messages and tooltip text.

<P>Sometimes you might want to change some of these messages
or texts in runtime. This requires a little work. The following
explanations are written for MDI.

<P>The easiest first; custom statusbar messages:

<P>For this you must override the GetMessageString function
of the CMDIFrameWnd. The following is an example:

<PRE><TT><FONT COLOR="#990000">
void CMainFrame::GetMessageString(UINT nID, CString& rMessage) const
{
	// load appropriate string
	if(!m_bCustomMessage) {
		CFrameWnd::GetMessageString(nID, rMessage);
		return;
	}
	
	switch(nID) {
	case ID_LOOK_UP:
		rMessage = _T("Look out");
		break;
	case ID_LOOK_DOWN:
		rMessage = _T("Look down");
		break;
	default:
		CFrameWnd::GetMessageString(nID, rMessage);
	}
}
</FONT></TT></PRE>


<P>Instead of hardcoding the messages, other string resources
than the default can be loaded and assigned. This above functionality
works also for menus.

<P>Now for something slightly more difficult; custom tooltip text.
I had to dig a little for this. To override the default tooltip
text handling two messages must be intercepted in the CMDIChildFrame,
namely TTN_NEEDTEXTW and TTN_NEEDTEXTA. One of these (depending on
unicode/not unicode) is sent when tooltip text is needed for
a toolbar button.

<PRE><TT><FONT COLOR="#990000">
BEGIN_MESSAGE_MAP(CMyChildFrame, CMDIChildWnd)
//{{AFX_MSG_MAP(CNetbasChildFrame)
ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0, 0xFFFF, OnToolTipText)
ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF, OnToolTipText)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyChildFrame message handlers
BOOL CMyChildFrame::GetToolText( UINT nID, CString& strTipText )
{
	switch(nID) {
	case ID_LOOK_UP:
		strTipText = _T("Tip out");
		return TRUE;
	case ID_LOOK_DOWN:
		strTipText = _T("Tip down");
		return TRUE;
	}
	return FALSE;
}

#define _countof(array) (sizeof(array)/sizeof(array[0]))

BOOL CMyChildFrame::OnToolTipText(UINT nID, NMHDR* pNMHDR,
								  LRESULT*pResult)
{
	ASSERT(pNMHDR->code == TTN_NEEDTEXTA || pNMHDR->code == TTN_NEEDTEXTW);
	
	TOOLTIPTEXTA* pTTTA = (TOOLTIPTEXTA*)pNMHDR;
	TOOLTIPTEXTW* pTTTW = (TOOLTIPTEXTW*)pNMHDR;
	
	CString strTipText;
	if ( GetToolText( pNMHDR->idFrom, strTipText ) )
	{
#ifndef _UNICODE
		if (pNMHDR->code == TTN_NEEDTEXTA)
			lstrcpyn(pTTTA->szText, strTipText, _countof(pTTTA->szText));
		else
			_mbstowcsz(pTTTW->szText, strTipText, _countof(pTTTW->szText));
#else
		if (pNMHDR->code == TTN_NEEDTEXTA)
			_wcstombsz(pTTTA->szText, strTipText, _countof(pTTTA->szText));
		else
			lstrcpyn(pTTTW->szText, strTipText, _countof(pTTTW->szText));
#endif
		return TRUE;
	}

	return CMDIChildWnd::OnToolTipText( nID, pNMHDR, pResult );
}
</FONT></TT></PRE>

<P>Here I have implemented a helper function that checks if we want to
override the given button. In
that case we assign a tooltip text. Otherwise we let the message pass
through.




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