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;;; x-menu.el --- menu support for X
;; Copyright (C) 1986 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Code:
(defmacro caar (conscell)
(list 'car (list 'car conscell)))
(defmacro cdar (conscell)
(list 'cdr (list 'car conscell)))
(defun x-menu-mode ()
"Major mode for creating permanent menus for use with X.
These menus are implemented entirely in Lisp; popup menus, implemented
with x-popup-menu, are implemented using XMenu primitives."
(make-local-variable 'x-menu-items-per-line)
(make-local-variable 'x-menu-item-width)
(make-local-variable 'x-menu-items-alist)
(make-local-variable 'x-process-mouse-hook)
(make-local-variable 'x-menu-assoc-buffer)
(setq buffer-read-only t)
(setq truncate-lines t)
(setq x-process-mouse-hook 'x-menu-pick-entry)
(setq mode-line-buffer-identification '("MENU: %32b")))
(defvar x-menu-max-width 0)
(defvar x-menu-items-per-line 0)
(defvar x-menu-item-width 0)
(defvar x-menu-items-alist nil)
(defvar x-menu-assoc-buffer nil)
(defvar x-menu-item-spacing 1
"*Minimum horizontal spacing between objects in a permanent X menu.")
(defun x-menu-create-menu (name)
"Create a permanent X menu. Returns an item which should be used as a
menu object whenever referring to the menu."
(let ((old (current-buffer))
(buf (get-buffer-create name)))
(set-buffer buf)
(x-menu-mode)
(setq x-menu-assoc-buffer old)
(set-buffer old)
buf))
(defun x-menu-change-associated-buffer (menu buffer)
"Change associated buffer of MENU to BUFFER. BUFFER should be a buffer
object."
(let ((old (current-buffer)))
(set-buffer menu)
(setq x-menu-assoc-buffer buffer)
(set-buffer old)))
(defun x-menu-add-item (menu item binding)
"Adds to MENU an item with name ITEM, associated with BINDING.
Following a sequence of calls to x-menu-add-item, a call to x-menu-compute
should be performed before the menu will be made available to the user.
BINDING should be a function of one argument, which is the numerical
button/key code as defined in x-menu.el."
(let ((old (current-buffer))
elt)
(set-buffer menu)
(if (setq elt (assoc item x-menu-items-alist))
(rplacd elt binding)
(setq x-menu-items-alist (append x-menu-items-alist
(list (cons item binding)))))
(set-buffer old)
item))
(defun x-menu-delete-item (menu item)
"Deletes from MENU the item named ITEM. x-menu-compute should be called
before the menu is made available to the user."
(let ((old (current-buffer))
elt)
(set-buffer menu)
(if (setq elt (assoc item x-menu-items-alist))
(rplaca elt nil))
(set-buffer old)
item))
(defun x-menu-activate (menu)
"Computes all necessary parameters for MENU. This must be called whenever
a menu is modified before it is made available to the user.
This also creates the menu itself."
(let ((buf (current-buffer)))
(pop-to-buffer menu)
(let (buffer-read-only)
(setq x-menu-max-width (1- (frame-width)))
(setq x-menu-item-width 0)
(let (items-head
(items-tail x-menu-items-alist))
(while items-tail
(if (caar items-tail)
(progn (setq items-head (cons (car items-tail) items-head))
(setq x-menu-item-width
(max x-menu-item-width
(length (caar items-tail))))))
(setq items-tail (cdr items-tail)))
(setq x-menu-items-alist (reverse items-head)))
(setq x-menu-item-width (+ x-menu-item-spacing x-menu-item-width))
(setq x-menu-items-per-line
(max 1 (/ x-menu-max-width x-menu-item-width)))
(erase-buffer)
(let ((items-head x-menu-items-alist))
(while items-head
(let ((items 0))
(while (and items-head
(<= (setq items (1+ items)) x-menu-items-per-line))
(insert (format (concat "%"
(int-to-string x-menu-item-width) "s")
(caar items-head)))
(setq items-head (cdr items-head))))
(insert ?\n)))
(shrink-window (max 0
(- (window-height)
(1+ (count-lines (point-min) (point-max))))))
(goto-char (point-min)))
(pop-to-buffer buf)))
(defun x-menu-pick-entry (position event)
"Internal function for dispatching on mouse/menu events"
(let* ((x (min (1- x-menu-items-per-line)
(/ (current-column) x-menu-item-width)))
(y (- (count-lines (point-min) (point))
(if (zerop (current-column)) 0 1)))
(item (+ x (* y x-menu-items-per-line)))
(litem (cdr (nth item x-menu-items-alist))))
(and litem (funcall litem event)))
(pop-to-buffer x-menu-assoc-buffer))
;;; x-menu.el ends here
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