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ToolTip with popup sound
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This article was contributed by <A HREF="mailto:giancarlo@saria.com">Giancarlo Iovino</A>.
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<img src="tooltip_sound.gif" width="245" height="106">
Download <A HREF="tooltip_sound.zip">Source Code</a> and <A HREF="tooltip_sound_demo.zip">Example</A>
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<p><strong>Introduction</strong></p>
<p>Can we do something to make a tooltip attracts the user
attention on it a little more? If the tooltip plays a sound when
it pops up then maybe the things should get better. Well, this is
a small class called <strong>CWavTipCtrl</strong> that inherits
from CToolTipCtrl and adds exactly this feature.</p>
<p><strong>Implementation details</strong></p>
<p>The key points in the control implementation are:</p>
<ul>
<li>How to play a wave file resource?</li>
<li>How to understand when the tooltip window pops up?</li>
</ul>
<p>The first argument is covered by the article "<a
href="../misc/play_wav_resource.shtml">Play Wav Resource</a>"
by Anthony Petruso.<br>
The answer to the second question isn't so trivial as you can
think. The first idea that comes in mind is to handle the
WM_SHOWWINDOW message: wrong! To find the solution, I browsed in
the MFC source code. Reading the code, it was clear that the
tooltip "pops up" thanks to a call to SetWindowPos()
that moves its window at the top of the Z-order (the depth order
of all the visible windows). The message to be handled is
therefore WM_WINDOWPOSCHANGED. But this message is sent also when
the tooltip window is dismissed. For this reason, in the
OnWindowPosChanged() function, it is necessary to check if the <em>lpwndpos->flag</em>
field contains the SWP_SHOWWINDOW flag. Here is the code:</p>
<pre>void CWavTipCtrl::OnWindowPosChanged(WINDOWPOS FAR* lpwndpos)
{
CToolTipCtrl::OnWindowPosChanged(lpwndpos);
if (lpwndpos->flags & SWP_SHOWWINDOW)
if (m_wWaveResourceID)
PlayResource(m_wWaveResourceID);
}
</pre>
<p><strong>How to use CWavTipCtrl</strong></p>
<p>Using this class is very simple. Include the WavTipCtrl.cpp
(and .h) in your project. Then add a tooltip to your window. For
example, if you want to add CWavTipCtrl to a dialog, first add a
tooltip component to it, then go in to the header file of the
dialog class, #include "WavTipCtrl.h" and replace
CToolTipCtrl with CWavTipCtrl. Include a custom wave resource in
your project (e.g. IDR_TOOLTIP_SOUND). Now, just add a call to <strong>SetPopupSound(IDR_TOOLTIP_SOUND)</strong>
in the OnInitDialog() body of your dialog. A last important
thing: be aware that your program should be linked with the
'winmm.lib' static library, or a link error will occur.</p>
<p><strong>Operations for CWawTipCtrl</strong></p>
<pre>void SetPopupSound(WORD wResourceID);
WORD GetPopupSound() const;</pre>
<p>Note: If you don't want your CWavTipCtrl uses the popup sound,
call SetPopupSound(NULL): NULL is considered as an invalid wave
resource ID.</p>
<h4>Author's note</h4>
<p>I'm continuously working to improve this control. I'll be
grateful to you if you mail me your comments, advice, or bug
apparition reports!.</p>
<p>Updated: May, 21 1998</p>
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