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1 | ;; Copyright (C) 1986 Free Software Foundation, Inc. |
2 | ||
3 | ;; This file is part of GNU Emacs. | |
4 | ||
5 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
6 | ;; it under the terms of the GNU General Public License as published by | |
7 | ;; the Free Software Foundation; either version 1, or (at your option) | |
8 | ;; any later version. | |
9 | ||
10 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | ;; GNU General Public License for more details. | |
14 | ||
15 | ;; You should have received a copy of the GNU General Public License | |
16 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
17 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | ||
19 | ||
20 | (defmacro caar (conscell) | |
21 | (list 'car (list 'car conscell))) | |
22 | ||
23 | (defmacro cdar (conscell) | |
24 | (list 'cdr (list 'car conscell))) | |
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. Returns an item which should be used as a | |
51 | menu object whenever referring to the menu." | |
52 | (let ((old (current-buffer)) | |
53 | (buf (get-buffer-create name))) | |
54 | (set-buffer buf) | |
55 | (x-menu-mode) | |
56 | (setq x-menu-assoc-buffer old) | |
57 | (set-buffer old) | |
58 | buf)) | |
59 | ||
60 | (defun x-menu-change-associated-buffer (menu buffer) | |
61 | "Change associated buffer of MENU to BUFFER. BUFFER should be a buffer | |
62 | object." | |
63 | (let ((old (current-buffer))) | |
64 | (set-buffer menu) | |
65 | (setq x-menu-assoc-buffer buffer) | |
66 | (set-buffer old))) | |
67 | ||
68 | (defun x-menu-add-item (menu item binding) | |
69 | "Adds to MENU an item with name ITEM, associated with BINDING. | |
70 | Following a sequence of calls to x-menu-add-item, a call to x-menu-compute | |
71 | should be performed before the menu will be made available to the user. | |
72 | ||
73 | BINDING should be a function of one argument, which is the numerical | |
74 | button/key code as defined in x-menu.el." | |
75 | (let ((old (current-buffer)) | |
76 | elt) | |
77 | (set-buffer menu) | |
78 | (if (setq elt (assoc item x-menu-items-alist)) | |
79 | (rplacd elt binding) | |
80 | (setq x-menu-items-alist (append x-menu-items-alist | |
81 | (list (cons item binding))))) | |
82 | (set-buffer old) | |
83 | item)) | |
84 | ||
85 | (defun x-menu-delete-item (menu item) | |
86 | "Deletes from MENU the item named ITEM. x-menu-compute should be called | |
87 | before the menu is made available to the user." | |
88 | (let ((old (current-buffer)) | |
89 | elt) | |
90 | (set-buffer menu) | |
91 | (if (setq elt (assoc item x-menu-items-alist)) | |
92 | (rplaca elt nil)) | |
93 | (set-buffer old) | |
94 | item)) | |
95 | ||
96 | (defun x-menu-activate (menu) | |
97 | "Computes all necessary parameters for MENU. This must be called whenever | |
98 | a menu is modified before it is made available to the user. | |
99 | ||
100 | 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- (screen-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 (caar 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 (caar 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 | (caar 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)) |