lisp/obsolete/x-menu.el

   1 ;;; x-menu.el --- menu support for X
   2
   3 ;; Copyright (C) 1986 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 ;; Boston, MA 02111-1307, USA.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 (defun x-menu-mode ()
  27   "Major mode for creating permanent menus for use with X.
  28 These menus are implemented entirely in Lisp; popup menus, implemented
  29 with x-popup-menu, are implemented using XMenu primitives."
  30   (make-local-variable 'x-menu-items-per-line)
  31   (make-local-variable 'x-menu-item-width)
  32   (make-local-variable 'x-menu-items-alist)
  33   (make-local-variable 'x-process-mouse-hook)
  34   (make-local-variable 'x-menu-assoc-buffer)
  35   (setq buffer-read-only t)
  36   (setq truncate-lines t)
  37   (setq x-process-mouse-hook 'x-menu-pick-entry)
  38   (setq mode-line-buffer-identification '("MENU: %32b")))
  39
  40 (defvar x-menu-max-width 0)
  41 (defvar x-menu-items-per-line 0)
  42 (defvar x-menu-item-width 0)
  43 (defvar x-menu-items-alist nil)
  44 (defvar x-menu-assoc-buffer nil)
  45
  46 (defvar x-menu-item-spacing 1
  47   "*Minimum horizontal spacing between objects in a permanent X menu.")
  48
  49 (defun x-menu-create-menu (name)
  50   "Create a permanent X menu.
  51 Returns an item which should be used as a
  52 menu object whenever referring to the menu."
  53   (let ((old (current-buffer))
  54         (buf (get-buffer-create name)))
  55     (set-buffer buf)
  56     (x-menu-mode)
  57     (setq x-menu-assoc-buffer old)
  58     (set-buffer old)
  59     buf))
  60
  61 (defun x-menu-change-associated-buffer (menu buffer)
  62   "Change associated buffer of MENU to BUFFER.
  63 BUFFER should be a buffer object."
  64   (let ((old (current-buffer)))
  65     (set-buffer menu)
  66     (setq x-menu-assoc-buffer buffer)
  67     (set-buffer old)))
  68
  69 (defun x-menu-add-item (menu item binding)
  70   "Add to MENU an item with name ITEM, associated with BINDING.
  71 Following a sequence of calls to x-menu-add-item, a call to x-menu-compute
  72 should be performed before the menu will be made available to the user.
  73
  74 BINDING should be a function of one argument, which is the numerical
  75 button/key code as defined in x-menu.el."
  76   (let ((old (current-buffer))
  77         elt)
  78     (set-buffer menu)
  79     (if (setq elt (assoc item x-menu-items-alist))
  80         (rplacd elt binding)
  81       (setq x-menu-items-alist (append x-menu-items-alist
  82                                        (list (cons item binding)))))
  83     (set-buffer old)
  84     item))
  85
  86 (defun x-menu-delete-item (menu item)
  87   "Delete from MENU the item named ITEM.
  88 Call `x-menu-compute' before making the menu available to the user."
  89   (let ((old (current-buffer))
  90         elt)
  91     (set-buffer menu)
  92     (if (setq elt (assoc item x-menu-items-alist))
  93         (rplaca elt nil))
  94     (set-buffer old)
  95     item))
  96
  97 (defun x-menu-activate (menu)
  98   "Compute all necessary parameters for MENU.
  99 This must be called whenever a menu is modified before it is made
 100 available to the user.  This also creates the menu itself."
 101   (let ((buf (current-buffer)))
 102     (pop-to-buffer menu)
 103     (let (buffer-read-only)
 104       (setq x-menu-max-width (1- (frame-width)))
 105       (setq x-menu-item-width 0)
 106       (let (items-head
 107             (items-tail x-menu-items-alist))
 108         (while items-tail
 109           (if (car (car items-tail))
 110               (progn (setq items-head (cons (car items-tail) items-head))
 111                      (setq x-menu-item-width
 112                            (max x-menu-item-width
 113                                 (length (car (car items-tail)))))))
 114           (setq items-tail (cdr items-tail)))
 115         (setq x-menu-items-alist (reverse items-head)))
 116       (setq x-menu-item-width (+ x-menu-item-spacing x-menu-item-width))
 117       (setq x-menu-items-per-line
 118             (max 1 (/ x-menu-max-width x-menu-item-width)))
 119       (erase-buffer)
 120       (let ((items-head x-menu-items-alist))
 121         (while items-head
 122           (let ((items 0))
 123             (while (and items-head
 124                         (<= (setq items (1+ items)) x-menu-items-per-line))
 125               (insert (format (concat "%"
 126                                       (int-to-string x-menu-item-width) "s")
 127                               (car (car items-head))))
 128               (setq items-head (cdr items-head))))
 129           (insert ?\n)))
 130       (shrink-window (max 0
 131                           (- (window-height)
 132                              (1+ (count-lines (point-min) (point-max))))))
 133       (goto-char (point-min)))
 134     (pop-to-buffer buf)))
 135
 136 (defun x-menu-pick-entry (position event)
 137   "Internal function for dispatching on mouse/menu events"
 138   (let* ((x (min (1- x-menu-items-per-line)
 139                  (/ (current-column) x-menu-item-width)))
 140          (y (- (count-lines (point-min) (point))
 141                (if (zerop (current-column)) 0 1)))
 142          (item (+ x (* y x-menu-items-per-line)))
 143          (litem (cdr (nth item x-menu-items-alist))))
 144     (and litem (funcall litem event)))
 145   (pop-to-buffer x-menu-assoc-buffer))
 146
 147 (provide 'x-menu)
 148
 149 ;;; arch-tag: 889f6d49-c01b-49e7-aaef-b0c6966c2961
 150 ;;; x-menu.el ends here