Re: About OnSetFocus - Subnote

From:
"Nobody" <Nobody@yahoo.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 13 Jul 2007 12:44:09 -0700
Message-ID:
<#JtNwYYxHHA.3616@TK2MSFTNGP02.phx.gbl>
Hi David,

I think you're on to something with OnMouseActivate().

Dang straight!

I don't think it's this big a deal.

Maybe not now, but in the future, then it becomes time to do it the =
right way.

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.

Yeah, it is possible to do it that way, but it is a hack.
I didn't know enough and that was how I was doing it at first.
It's the same thing with putting it in OnLButtonDown, OnRButtonDown, =
etc.
It is possible, but it just isn't the right way.

Perhaps you can also look at other controls on CodeProject or Codeguru =

that also use the mouse

and see how they handle focus issues.

What for? I already know.
Like I said, it is possible to do it other ways, but they are just =
hacks.

Thanks,
"David Ching" <dc@remove-this.dcsoft.com> wrote in message =
news:WwLli.18862$Rw1.2832@newssvr25.news.prodigy.net...

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.
 
Cheers,
David
 
"Nobody" <Nobody@yahoo.com> wrote in message
news:u6H85RSxHHA.2432@TK2MSFTNGP04.phx.gbl...
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()
{
      GetControl()->SetFocus();
}
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.
 
Regards,
"Nobody" <Nobody@yahoo.com> wrote in message
news:usIT8ROxHHA.4464@TK2MSFTNGP02.phx.gbl...
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

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

work.
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

active.
Sure enough. down inside of CView::OnMouseActive() it has
     CWnd::OnMouseActivate()
     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.
CControl::OnPreTranslateMessage()
{
  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
automatically.
http://www.codeproject.com:80/miscctrl/customcontrol.asp
 
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.
   GetControl()->InitControl();
}
 
Back to the Drawing board, err make that Keyboard.
 
Thanks,
"Nobody" <Nobody@yahoo.com> wrote in message
news:%23wsX5NExHHA.312@TK2MSFTNGP04.phx.gbl...
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

messages.
(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.
 
P.S.
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...
 
Thanks,
"David Ching" <dc@remove-this.dcsoft.com> wrote in message
news:w3hli.37796$YL5.14917@newssvr29.news.prodigy.net...

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

this.

-- David

"Nobody" <Nobody@yahoo.com> wrote in message
news:eBVB$VCxHHA.4592@TK2MSFTNGP05.phx.gbl...
Hi,

I had to comment out the CWnd::OnKillFocus(). I guess that prevents =

if

from
losing focus.
like it shows here http://www.winterdom.com:80/dev/mfc/PopupEdit.cpp

#include <afxpriv.h> //for WM_INITs

/* If in a dialog */
ON_MESSAGE(WM_INITDIALOG, InitialUpdate)

/* If in a view */
ON_MESSAGE(WM_INITIALUPDATE, InitialUpdate)

Control::InitialUpdate(WPARAM wParam, LPARAM lParam)
{
    SetFocus();
}

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

I haven't tested it in a dialog yet.

Thanks all!

 

 

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