Re: About OnSetFocus - Subnote

"David Ching" <>
Fri, 13 Jul 2007 13:57:10 GMT
I think you're on to something with OnMouseActivate(). Perhaps you can also
look at other controls on CodeProject or Codeguru that also use the mouse
and see how they handle focus issues. I don't think it's this big a deal.
Perhaps because I've always done it the easy way of having the parent window
give the focus to the desired child control, when it gets it.


"Nobody" <> wrote in message
Hi Dave,

I knew commenting out
CView::OnMouseActivate(pDesktopWnd, nHitTest, message);
was going to be bad.

So, to remedy that.
int CMyView::OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest, UINT message)
   CWnd* pWnd = GetFocus(); //Save Current Focus
   int ret = CView::OnMouseActivate(pDesktopWnd, nHitTest, message);
   pWnd->SetFocus(); //Restore it
   return ret;

I suppose I could have done it the easy way.
void CMyView::OnSetFocus()
But, at least I know what is going on now anyways.
And, if I have multiple controls in a View, like that of a Dialog, it will
work just like a Dialog, but without the tab support.

"Nobody" <> wrote in message
Hi David,

I get it now.

It really doesn't matter if you do SetFocus() inside a control in OnInit().
Somebody else could be doing SomethingElse()->SetFocus() afterwards, which
takes the focus away.
I ended up removing OnSetFocus() and OnKillFocus() and the SetFocus() in

I added this to get it to work correctly.
int CControl::OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest, UINT
    // When Control becomes active, get the focus. Makes sense.
    return CWnd::OnMouseActivate(pDesktopWnd, nHitTest, message);

Think of it this way. When you tab to controls in a dialog, you would think
the dialog manager
sets the focus to the next tabbed control, which I suppose is does, since it
was working correctly.
But, what happens when a control is clicked instead of tabbing? It didn't
So, Tabbing works, but not if the control is clicked. That was the reasoning
behind adding OnMouseActivate()

I was also having a problem in the View.
As soon as the Control gets the focus, it was immediately taken away.
Thats probably because when the Control becomes active, it makes the View
active, which in turn takes away the focus.
So, what I did was this
int CMyView::OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest, UINT message)
   // return CView::OnMouseActivate(pDesktopWnd, nHitTest, message);
   return TRUE;
That is what I was looking for. This is the function that makes a window
Sure enough. down inside of CView::OnMouseActive() it has
      HWND hWndFocus ::SetFocus().
*Note that it could be dangerous to just comment out
CView::OnMouseActivate() I will probably have to move CView stuff to here
and just remove ::SetFocus.
I am not having any problems as of yet.

So, that is actually how it works!

Also, in a dialog, I was getting that "Bonk" sound.
I actually don't need the WM_KEYDOWN messages and I just use
PreTranslateMessage instead.
   If(pMsg->message == WM_KEYDOWN)
      UINT nChar = (UINT)pMsg->wParam;
      UINT nRepCnt = (UINT)pMsg->lParam & 0xFF00;
      UINT nFlags = (UINT)pMsg->lParam >> 16;
      OnKeyDown(nChar, nRepCnt, nFlags);
      return TRUE; //No further processing needed. No "Bonk" sound.
   return CWnd::PreTranslateMessage()

More about controls. If interested.

Dialog Initialization is different from Control.Create()
OnCreate() is not called when used in a Dialog.
Which is messing me up somewhat.

It has to do with embedding Custom Controls in a dialog.
A window is automatically created for you.
That way, you don't need to set the Rect Coodinates. It is done

Second, I am not getting the WM_INITDIALOG messages, so I have to intialize
the control manually
BOOL CDlgTest::OnInitDialog()
    //I shouldn't have to be doing it this way.

Back to the Drawing board, err make that Keyboard.

"Nobody" <> wrote in message
Hi David,

Your probably right. I haven't gotten to that point just yet.
Like I said, I have not tested it in a Dialog.

The odd thing is that if I don't comment out the CWnd::OnKillFocus(pNewWnd);
The messages go directly to the View.

The control has the "Focus", (Need a different word) but the WM_KEYDOWN
messages are going to the View.
I'm not sure what makes a window "Active", or if it even cares.
I think it is just another rect and somewhere in the background, it does
something like
IsTopLevelWindow() Yes
PointInRect(point) Yes,
Well then, send mouse messages to that Window.

I don't know exactly what is going on just yet.
I can open a dialog, or any other window and whatever window/control gains
the focus.
and when I come back to my control, it has focus.
(Note that I do not call set focus again. I only call SetFocus once.)
So, that wouldn't be right if it works like your thinking, which sounds
correct, I might add.

Maybe it is working like OnMouseMove().
If somehow, WM_MOUSEMOVE is disabled, the control would never get the mouse
(That could be very well be the case in a static text control, hence the
SS_NOTIFY ... for keyboard messages )
but, you don't have to call SetFocus() for mouse messages, yet the mouse
messages still work in other windows,
That could be very well what is going on.
I could just be enabling Keyboard messages to go to my control instead of
SetCapture() which keeps the messages
from propagating, which is what you and I are thinking.
That is the best I can figure so far.

I'll put the control in a dialog and let you know how things go.

Heck, I am happy I got this far.

Something interesting as far as controls go.
Do you know who sends WM_INITDIALOG or WM_INITIALUPDATE.
That is kind of bugging me. CFrameWnd::OnInitialUpdate() might be doing it
for the View, but I am not sure
who sends the message to the dialog?

P.S.S. Some beer speak. Rambling on...

"David Ching" <> wrote in message

I'm still not sure if it is correct behavior for a control to set focus to
itself on creation. What if the caller doesn't want that? What if there
are 2 or more instances of the control in the dialog; which one should get
focus? The caller (i.e. dialog) needs to have control of this! The world
would be a mess if all the controls in the dialog tried to grab focus like

-- David

"Nobody" <> wrote in message

I had to comment out the CWnd::OnKillFocus(). I guess that prevents if
losing focus.
like it shows here

#include <afxpriv.h> //for WM_INITs

/* If in a dialog */

/* If in a view */

Control::InitialUpdate(WPARAM wParam, LPARAM lParam)

void Control::OnKillFocus(CWnd* pNewWnd)
// CWnd::OnKillFocus(pNewWnd);

I haven't tested it in a dialog yet.

Thanks all!

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