tooltip_for_disabled_control2.shtml

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   <TITLE>Controls - Tooltip for disabled controls (2)</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
Tooltip for disabled controls (2)
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This article was contributed by <A HREF="mailto:ray@apso.com">Ray Auchterlounie</A>.

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<p>As an alternative to the <a href="tooltip_for_disabled_control.shtml">method</a>
suggested by Ran Almog, you can replicate MFCs fix in the dialog's PreTranslateMessage override.

<p>The MFC code to look at is in the function <tt>RelayToolTipMessage</tt> in the
file TOOLTIP.CPP.

<p>This method has the advantage that it uses the tooltip itself to find
the child window, the relevant CToolTipCtrl function is
CToolTipCtrl::OnWindowFromPoint()  - which has other fixes for special
cases as well as the disabled control case. 

<p><b>Example</b>: if using the DeveloperStudio Tooltip component, change the
block it adds in <tt>PreTranslateMessage</tt> from:

<FONT COLOR="#990000"><TT><PRE>
	// CG: The following block was added by the ToolTips component.
	{
		// Let the ToolTip process this message.
		m_tooltip.RelayEvent(pMsg);
	}
</tt></PRE></FONT>

<p>to:

<FONT COLOR="#990000"><TT><PRE>
	// CG: The following block was added by the ToolTips component.
	{
		// transate the message based on TTM_WINDOWFROMPOINT
		MSG msg = *pMsg;
		msg.hwnd = (HWND)m_tooltip.SendMessage(TTM_WINDOWFROMPOINT, 0, (LPARAM)&msg.pt);
		CPoint pt = pMsg->pt;
		if (msg.message >= WM_MOUSEFIRST && msg.message <= WM_MOUSELAST)
			::ScreenToClient(msg.hwnd, &pt);
		msg.lParam = MAKELONG(pt.x, pt.y);

		// Let the ToolTip process this message.
		m_tooltip.RelayEvent(&msg);
	}
</tt></PRE></FONT>

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<p>Last updated: 22 June 1998

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