Re: F10 → menu

[john@ankarstrom.se (John Ankarström)]

Jean-Christophe Helary <jean.christophe.helary@gmail.com> writes:

>> On May 28, 2017, at 22:24, John Ankarström <john@ankarstrom.se> wrote:
>
>> I looked at the documentation for `x-popup-menu':
>> 
>>> Pop up a deck-of-cards menu and return user’s selection.
>> 
>> <C-f2>, as defined above, would only return the user's
>> selection without executing it. For example, when selecting
>> Help > Emacs Tutorial, the following is returned:
>> 
>>> (help-menu emacs-tutorial)
>> 
>> I'm not sure on how you'd go about executing that, but I'm
>> sure there's a way.
>
> Ok, I feel better :) I just need to investigate that, it's not
> a problem with my system...

I took a look at the source for `x-menu-bar-open', which is the
function called by `menu-bar-open' (<C-down-mouse-3>):

--8<---------------cut here---------------start------------->8---
(defun x-menu-bar-open (&optional frame)
  "Open the menu bar if it is shown.
`popup-menu' is used if it is off."
  (interactive "i")
  (cond
    ((and (not (zerop (or (frame-parameter nil 'menu-bar-lines) 0)))
          (fboundp 'accelerate-menu))
     (accelerate-menu frame))
    (t
     (popup-menu (mouse-menu-bar-map) last-nonmenu-event))))
--8<---------------cut here---------------end--------------->8---

It calls `popup-menu', which seems to do the pretty much the same
thing as `x-popup-menu', but instead of just returning the
selected item, it executes it:

> Popup the given menu and call the selected option.

Thus, to achieve the functionality you want (which seems to be
opening the menu in the top-left corner of the window?), the
following function would do it:

--8<---------------cut here---------------start------------->8---
(defun menu-bar-open-top-left ()
  (interactive)
  (popup-menu (mouse-menu-bar-map) (list '(0 0) (selected-frame))))

(global-set-key (kbd "<C-f2>") #'menu-bar-open-top-left)
--8<---------------cut here---------------end--------------->8---

Hope that works for you.

- John