Re: What is the difference between down-mouse-3 and mouse-3

["Ye Wenbin" <wenbinye@gmail.com>]

On Tue, 15 Apr 2008 22:45:52 +0800, Stefan Monnier  
<monnier@iro.umontreal.ca> wrote:

> Don't know, it works for me (tried both with the trunk and with 22.1).
> What do you mean by "does not work"?
Really, I test both emacs22 (GNU Emacs 22.1.1 (i486-pc-linux-gnu,  
GTK+ Version 2.10.11) of 2007-11-21 on vernadsky)
and emacs23(GNU Emacs 23.0.60.7 (i686-pc-linux-gnu, GTK+ Version 2.10.11)  
of 2008-03-29 on ywb-laptop),
if bind the menu to mouse-3, the command in submenu does not called. I  
test as following:
  1. `emacs -q' start emacs
  2. in *scratch* buffer, paste code:
(define-derived-mode foo-mode text-mode "Foo"
   "Test major mode"
   )
(easy-menu-define foo-menu foo-mode-map "My own menu"
   '("Foo"
     ["Next Line" next-line t]
     ("Sub Menu"
      ["Previous Line" previous-line t])))

(define-key foo-mode-map [mouse-3] 'mouse-popup-menubar-stuff)

  3. M-x eval-buffer
  4. click right mouse button, select "Sub Menu" "Previous Line", the  
cursor does not
  go to previous line, but if select "Next Line", the cursor moves.

>
> This said, binding it to down-mouse-3 is *much* better so you can do
> "press-button, select-entry, release-button".
That may be the answer. But if it is true that bind mouse menu to mouse-3  
doesn't work for submenu,
I think the elisp manual should emphasize this. After I figure out the  
problem, I only find a paragraph
metion it:

22.17.2 Menus and the Mouse

    It's often best to use a button-down event to trigger the menu.  Then
the user can select a menu item by releasing the button.

-- 
Best Regards,
Ye Wenbin