Custom status messages and tooltips

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

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.

The easiest first; custom statusbar messages:

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


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);
	}
}

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

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.


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 );
}

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.



Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: April 21, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT For mid-sized companies, the challenge of serving people and providing better service is forcing a re-evaluation of their contact centers to improve customer experiences. While these growing enterprises are driving much of the market's innovation, they must remain nimble in how they operate, and be very responsive to customer needs. This upcoming eSeminar reveals five ways mid-size organizations can gain needed agility and examines how delivering …

  • Who can you trust? Learn from the IBM X-Force team in this new quarterly report how the Internet of Things and IP reputation tracking are transforming the security landscape.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date