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   <TITLE>StatusBar - Show scrolling text in a status bar pane</TITLE>
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<FONT COLOR="#AOAO99">Show scrolling text in a status bar pane</FONT></H3></CENTER>

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This article was contributed by <A HREF="mailto:S.Saxena@pbc.be.philips.com">Sushil Saxena</A>. 


<p>This simple trick uses string pointer manipulation to give scrolling 
effect in a status bar. The code is not robust. It only demonstrates 
how it could be done.

<p>1. Derive your own CMyStatusBar from CstatusBar.

<p>2. In MainFrm.h, change the type of status bar as:

<PRE><TT><FONT COLOR="#990000">	CMyStatusBar m_wndStatusBar;
</FONT></TT></PRE>

<p>3. Also change the indicator array in MainFrm.cpp as:
      
<PRE><TT><FONT COLOR="#990000">	static UINT indicators[] =
	{
		ID_SEPARATOR, 
		IDS_SCROLL_PANE,				//scrolling text
		ID_INDICATOR_CAPS,
		ID_INDICATOR_NUM,
		ID_INDICATOR_SCRL,
	};
</FONT></TT></PRE>
      
<p>4. Add IDS_SCROLL_PANE in the string table with few blanks. The size 
of pane will depend on this blank string. There are other painfull 
ways of sizing a pane too.

<p>5. Add following member to CMyStatusBar:

Cstring m_strScrollText;

<p>6. Add OnTimer() to the CMyStatusBar:

<PRE><TT><FONT COLOR="#990000">void CMyStatusBar::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
	
	if (m_strScrollText.IsEmpty())
	{
		KillTimer(1);
		SetPaneText(CommandToIndex(IDS_SCROLL_PANE), "");
		return;
	}
	static UINT str_idx = 0;        //offset into string
	
	//if end of string, return to top
	if (str_idx >= (UINT) (m_strScrollText.GetLength() / 2) - 1)
	{
		str_idx = 0;
	}
	
	//display string
	SetPaneText(CommandToIndex(IDS_SCROLL_PANE), ((LPCSTR) 
		m_strScrollText)+str_idx); 
	
	//scroll one character
	str_idx = str_idx + 1;
	
	CStatusBar::OnTimer(nIDEvent);
}
</FONT></TT></PRE>

<p>7. Destroy timer:

<PRE><TT><FONT COLOR="#990000">void CMyStatusBar::OnDestroy() 
{
	CStatusBar::OnDestroy();
	
	// TODO: Add your message handler code here
	
	KillTimer(1);
}
</FONT></TT></PRE>

<p>8. Add a method to start scrolling text. This method must be called 
after the mainframe (and the status bar) has been constructed to 
display scrolling text. Perhaps from the CWinApp::InitInstance().

<PRE><TT><FONT COLOR="#990000">void CMyStatusBar::StartDisplay(void) 
{
	//set text for scrolling
	m_strScrollText = "   Hello! World.   "
		
		//to make it circular scroll
		m_strScrollText += m_strScrollText;
	
	KillTimer(1);
	VERIFY(SetTimer(1, 200, NULL) != 0);    //timer
}
</FONT></TT></PRE>




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<CENTER><FONT SIZE=-2>&copy; 1998 Zafir Anjum</FONT>&nbsp;</CENTER>
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<DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A>&nbsp;</FONT></DIV>
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