Re: WM_LBUTTONDOWN in Multi-document interface

From:

"AliR $VC++ MVP$" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 22 Aug 2007 10:33:13 -0500

Message-ID:

<CKYyi.6338$924.381@newssvr23.news.prodigy.net>

You know that all the messages go through CWinApp::PreTranslateMessaage. So
in essence you can detect all clicks like this

BOOL CMyApp::PreTranslateMessage(MSG* pMsg)
{
   if (pMsg->message == WM_LBUTTONDOWN)
   {
   }
   else if (pMsg->message == WM_NCLBUTTONDOWN)
   {
   }

   return CWinApp::PreTranslateMessage(pMsg);
}

But the I don't know how you would know which window they clicked on, that
is if you care about that at all. Although there is WindowFromPoint() but
then again, finding out who's HWND was just returned is a different story.

AliR.

"RobKinney1" <mydigitalportal.net@gmail.com.NOSPAMPLEASE> wrote in message
news:CB2695DB-D7FE-442A-B68D-8CF32A37B85D@microsoft.com...

Hello Joe,

Please worry about your deadline first! My stuff is not too important at
the moment... our deadline is still 3 weeks away :~].

At the time, I thought that just clicking on the window and gathering
events
through WM_LBUTTONDOWN was enough to gather whether or not someone clicked
on
the app, but as I found out it is more complex than that.

I wish the college I went to for my CS degree actually concentrated on
windows programing. Unfortunately there was hardly any (if any at all...
their idea of visual programing was a class where we did extremely light
development of Java apps)... I have to start at ground 0 for all this
stuff.
But at least I was introduced to subclassing... I didn't even know that
existed! But so goes life I guess... :~]

I did end up intercepting the WM_NCLBUTTONDOWN messages using the class
wizard generated method:
LRESULT CMainFrame::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{...}

So I combine the WM_NCLBUTTONDOWN and WM_SETFOCUS from CMainFrame with the
WM_LBUTTONDOWN from the subclassed m_hWndMDIClient and I have a somewhat
close idea that they clicked the app... probably not the best though....
using this method I will have to wire up something with all my child
windows
to also notify with clicks, but that shouldn't be too bad.

Thanks again for your help. Please only do this at your leisure and if
you
feel like it.

Thanks,

Rob

"Joseph M. Newcomer" wrote:

This goes back to the point of asking the correct question. If you are
trying to see if
there is any mouse click, this is the situation where PreTranslateMessage
is going to
help. So the correct question to ask was not "Why am I not getting
WM_LBUTTONDOWN
messages" but "How can I detect a mouse-down event anywhere in my app?"

I've got a serious deadline coming up, but I'll try to come up with a
better answer.
joe

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm