Re: Activate/Deactivate Toolbar button(s)

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 24 May 2007 11:32:24 -0500

Message-ID:

<ORmd1ihnHHA.4516@TK2MSFTNGP05.phx.gbl>

divya_rathore_@gmail.com wrote:

On May 24, 7:11 pm, "Tom Serface" <tom.nos...@camaswood.com> wrote:

I would just make individual handlers for each button. Then they will be
dimmed or undimmed depending on the availability of the handler and the
return from the ON_UPDATE_COMMAND calls. MFC does a good job of managing
this sort of thing and it will also translate into proper behavior for any
menu items you have that correspond to buttons.

Tom

I am using ON_UPDATE_COMMAND_UI_RANGE and have been able to implement
it nicely in the MainFrame.
My question was.. where to send the message to the Toolbar to check
for opened docs and disable buttons if none are open.

OnClose of ChildFrame is too early for this as that particular doc/
view is still open. That's why I was wondering if PostNcDestroy is an
appropriate time for this.

Secondly, what message is to be sent? How do I send CCmdUI* as
argument?

I'm not sure I understand the question. You not call the
ON_UPDATE_COMMAND handler yourself. Rather it is called whenever you pop
up a menu, and during idle time (this is how toolbar buttons get
activated/deactivated). Your ON_UPDATE_COMMAND handler should determine
the current situation and enable/disable accordingly.

--
David Wilkinson
Visual C++ MVP