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1 | ;;; x-menu.el --- menu support for X |
2 | ||
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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 | |
de49a6d3 | 9 | ;; the Free Software Foundation; either version 2, or (at your option) |
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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 | |
19 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
d46bac56 | 21 | ;;; Code: |
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22 | |
23 | (defmacro caar (conscell) | |
24 | (list 'car (list 'car conscell))) | |
25 | ||
26 | (defmacro cdar (conscell) | |
27 | (list 'cdr (list 'car conscell))) | |
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. Returns an item which should be used as a | |
54 | menu object whenever referring to the menu." | |
55 | (let ((old (current-buffer)) | |
56 | (buf (get-buffer-create name))) | |
57 | (set-buffer buf) | |
58 | (x-menu-mode) | |
59 | (setq x-menu-assoc-buffer old) | |
60 | (set-buffer old) | |
61 | buf)) | |
62 | ||
63 | (defun x-menu-change-associated-buffer (menu buffer) | |
64 | "Change associated buffer of MENU to BUFFER. BUFFER should be a buffer | |
65 | object." | |
66 | (let ((old (current-buffer))) | |
67 | (set-buffer menu) | |
68 | (setq x-menu-assoc-buffer buffer) | |
69 | (set-buffer old))) | |
70 | ||
71 | (defun x-menu-add-item (menu item binding) | |
72 | "Adds to MENU an item with name ITEM, associated with BINDING. | |
73 | Following a sequence of calls to x-menu-add-item, a call to x-menu-compute | |
74 | should be performed before the menu will be made available to the user. | |
75 | ||
76 | BINDING should be a function of one argument, which is the numerical | |
77 | button/key code as defined in x-menu.el." | |
78 | (let ((old (current-buffer)) | |
79 | elt) | |
80 | (set-buffer menu) | |
81 | (if (setq elt (assoc item x-menu-items-alist)) | |
82 | (rplacd elt binding) | |
83 | (setq x-menu-items-alist (append x-menu-items-alist | |
84 | (list (cons item binding))))) | |
85 | (set-buffer old) | |
86 | item)) | |
87 | ||
88 | (defun x-menu-delete-item (menu item) | |
89 | "Deletes from MENU the item named ITEM. x-menu-compute should be called | |
90 | before the menu is made available to the user." | |
91 | (let ((old (current-buffer)) | |
92 | elt) | |
93 | (set-buffer menu) | |
94 | (if (setq elt (assoc item x-menu-items-alist)) | |
95 | (rplaca elt nil)) | |
96 | (set-buffer old) | |
97 | item)) | |
98 | ||
99 | (defun x-menu-activate (menu) | |
100 | "Computes all necessary parameters for MENU. This must be called whenever | |
101 | a menu is modified before it is made available to the user. | |
102 | ||
103 | This also creates the menu itself." | |
104 | (let ((buf (current-buffer))) | |
105 | (pop-to-buffer menu) | |
106 | (let (buffer-read-only) | |
de49a6d3 | 107 | (setq x-menu-max-width (1- (frame-width))) |
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108 | (setq x-menu-item-width 0) |
109 | (let (items-head | |
110 | (items-tail x-menu-items-alist)) | |
111 | (while items-tail | |
112 | (if (caar 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 (caar 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 | (caar 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)) | |
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149 | |
150 | ;;; x-menu.el ends here |