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c0551649 GM |
1 | ;;; x-menu.el --- menu support for X |
2 | ||
f2e3589a | 3 | ;; Copyright (C) 1986, 2001, 2002, 2003, 2004, 2005, |
2f043267 | 4 | ;; 2006, 2007, 2008 Free Software Foundation, Inc. |
c0551649 GM |
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 | |
5a9dffec | 10 | ;; the Free Software Foundation; either version 3, or (at your option) |
c0551649 GM |
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 | |
3a35cf56 LK |
20 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | ;; Boston, MA 02110-1301, USA. | |
c0551649 GM |
22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;;; Code: | |
26 | ||
35d886bb JB |
27 | (defvar x-process-mouse-hook) |
28 | ||
c0551649 GM |
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 | ||
cbee283d | 152 | ;; arch-tag: 889f6d49-c01b-49e7-aaef-b0c6966c2961 |
c0551649 | 153 | ;;; x-menu.el ends here |