lisp/obsolete/x-menu.el

   1 ;;; x-menu.el --- menu support for X
   2
   3 ;; Copyright (C) 1986, 2001, 2002, 2003, 2004, 2005,
   4 ;;   2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation; either version 3, or (at your option)
  11 ;; any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  20 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 ;; Boston, MA 02110-1301, USA.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (defvar x-process-mouse-hook)
  28
  29 (defun x-menu-mode ()
  30   "Major mode for creating permanent menus for use with X.
  31 These menus are implemented entirely in Lisp; popup menus, implemented
  32 with x-popup-menu, are implemented using XMenu primitives."
  33   (make-local-variable 'x-menu-items-per-line)
  34   (make-local-variable 'x-menu-item-width)
  35   (make-local-variable 'x-menu-items-alist)
  36   (make-local-variable 'x-process-mouse-hook)
  37   (make-local-variable 'x-menu-assoc-buffer)
  38   (setq buffer-read-only t)
  39   (setq truncate-lines t)
  40   (setq x-process-mouse-hook 'x-menu-pick-entry)
  41   (setq mode-line-buffer-identification '("MENU: %32b")))
  42
  43 (defvar x-menu-max-width 0)
  44 (defvar x-menu-items-per-line 0)
  45 (defvar x-menu-item-width 0)
  46 (defvar x-menu-items-alist nil)
  47 (defvar x-menu-assoc-buffer nil)
  48
  49 (defvar x-menu-item-spacing 1
  50   "*Minimum horizontal spacing between objects in a permanent X menu.")
  51
  52 (defun x-menu-create-menu (name)
  53   "Create a permanent X menu.
  54 Returns an item which should be used as a
  55 menu object whenever referring to the menu."
  56   (let ((old (current-buffer))
  57         (buf (get-buffer-create name)))
  58     (set-buffer buf)
  59     (x-menu-mode)
  60     (setq x-menu-assoc-buffer old)
  61     (set-buffer old)
  62     buf))
  63
  64 (defun x-menu-change-associated-buffer (menu buffer)
  65   "Change associated buffer of MENU to BUFFER.
  66 BUFFER should be a buffer object."
  67   (let ((old (current-buffer)))
  68     (set-buffer menu)
  69     (setq x-menu-assoc-buffer buffer)
  70     (set-buffer old)))
  71
  72 (defun x-menu-add-item (menu item binding)
  73   "Add to MENU an item with name ITEM, associated with BINDING.
  74 Following a sequence of calls to x-menu-add-item, a call to x-menu-compute
  75 should be performed before the menu will be made available to the user.
  76
  77 BINDING should be a function of one argument, which is the numerical
  78 button/key code as defined in x-menu.el."
  79   (let ((old (current-buffer))
  80         elt)
  81     (set-buffer menu)
  82     (if (setq elt (assoc item x-menu-items-alist))
  83         (rplacd elt binding)
  84       (setq x-menu-items-alist (append x-menu-items-alist
  85                                        (list (cons item binding)))))
  86     (set-buffer old)
  87     item))
  88
  89 (defun x-menu-delete-item (menu item)
  90   "Delete from MENU the item named ITEM.
  91 Call `x-menu-compute' before making the menu available to the user."
  92   (let ((old (current-buffer))
  93         elt)
  94     (set-buffer menu)
  95     (if (setq elt (assoc item x-menu-items-alist))
  96         (rplaca elt nil))
  97     (set-buffer old)
  98     item))
  99
 100 (defun x-menu-activate (menu)
 101   "Compute all necessary parameters for MENU.
 102 This must be called whenever a menu is modified before it is made
 103 available to the user.  This also creates the menu itself."
 104   (let ((buf (current-buffer)))
 105     (pop-to-buffer menu)
 106     (let (buffer-read-only)
 107       (setq x-menu-max-width (1- (frame-width)))
 108       (setq x-menu-item-width 0)
 109       (let (items-head
 110             (items-tail x-menu-items-alist))
 111         (while items-tail
 112           (if (car (car items-tail))
 113               (progn (setq items-head (cons (car items-tail) items-head))
 114                      (setq x-menu-item-width
 115                            (max x-menu-item-width
 116                                 (length (car (car items-tail)))))))
 117           (setq items-tail (cdr items-tail)))
 118         (setq x-menu-items-alist (reverse items-head)))
 119       (setq x-menu-item-width (+ x-menu-item-spacing x-menu-item-width))
 120       (setq x-menu-items-per-line
 121             (max 1 (/ x-menu-max-width x-menu-item-width)))
 122       (erase-buffer)
 123       (let ((items-head x-menu-items-alist))
 124         (while items-head
 125           (let ((items 0))
 126             (while (and items-head
 127                         (<= (setq items (1+ items)) x-menu-items-per-line))
 128               (insert (format (concat "%"
 129                                       (int-to-string x-menu-item-width) "s")
 130                               (car (car items-head))))
 131               (setq items-head (cdr items-head))))
 132           (insert ?\n)))
 133       (shrink-window (max 0
 134                           (- (window-height)
 135                              (1+ (count-lines (point-min) (point-max))))))
 136       (goto-char (point-min)))
 137     (pop-to-buffer buf)))
 138
 139 (defun x-menu-pick-entry (position event)
 140   "Internal function for dispatching on mouse/menu events"
 141   (let* ((x (min (1- x-menu-items-per-line)
 142                  (/ (current-column) x-menu-item-width)))
 143          (y (- (count-lines (point-min) (point))
 144                (if (zerop (current-column)) 0 1)))
 145          (item (+ x (* y x-menu-items-per-line)))
 146          (litem (cdr (nth item x-menu-items-alist))))
 147     (and litem (funcall litem event)))
 148   (pop-to-buffer x-menu-assoc-buffer))
 149
 150 (provide 'x-menu)
 151
 152 ;;; arch-tag: 889f6d49-c01b-49e7-aaef-b0c6966c2961
 153 ;;; x-menu.el ends here