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<CENTER><H3><FONT COLOR="#AOAO99">DataTip</FONT></H3></CENTER>
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This article was contributed by <A HREF="mailto:simon@techsoft.demon.co.uk">Simon Wilson</A>.
<P>This class shows how I went about implementing my own tooltip window when I
had trouble getting the standard Tooltips to provide the functionality I
wanted. The attached code readily demonstrates the concepts of defining your
own windows for use with MFC, installing keyboard hooks, and handling the
correct clean-up of the system on completion (note the static methods and
instance counting). The windows use the same colour scheme as Tooltips under
Win95/NT (COLOR_INFOBK + COLOR_INFOTEXT) but you can choose your own colours
should you wish (see the OnPaint method).
<P>The class uses the standard two-stage MFC creation process. You use the
class by defining an instance of the class in your view/dialog/etc and then
calling the Create method passing it a pointer to the parent window
(normally in your OnInitialUpdate or OnInitDialog methods).
<P>You then handle the OnMouseMove event and call the Set method passing it a
display point and display string. If the mouse remains static for the
pre-defined delay time (set via SetDelay) then a tip window will be
displayed at the appropiate point. Pressing a key, pressing a mouse button,
or moving the mouse outside of a pre-defined are will remove the tip window
from the display.
<H4>Example:</H4>
<PRE><TT><FONT COLOR="#990000">
class CMyView : public CView
{
:
SIMDataTip m_datatip;
:
};
void CMyView::OnInitialUpdate()
{
CView::OnInitialUpdate();
// enable datatips for this window
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