| 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 | ;;; Code: |
| 23 | |
| 24 | (defun x-menu-mode () |
| 25 | "Major mode for creating permanent menus for use with X. |
| 26 | These menus are implemented entirely in Lisp; popup menus, implemented |
| 27 | with x-popup-menu, are implemented using XMenu primitives." |
| 28 | (make-local-variable 'x-menu-items-per-line) |
| 29 | (make-local-variable 'x-menu-item-width) |
| 30 | (make-local-variable 'x-menu-items-alist) |
| 31 | (make-local-variable 'x-process-mouse-hook) |
| 32 | (make-local-variable 'x-menu-assoc-buffer) |
| 33 | (setq buffer-read-only t) |
| 34 | (setq truncate-lines t) |
| 35 | (setq x-process-mouse-hook 'x-menu-pick-entry) |
| 36 | (setq mode-line-buffer-identification '("MENU: %32b"))) |
| 37 | |
| 38 | (defvar x-menu-max-width 0) |
| 39 | (defvar x-menu-items-per-line 0) |
| 40 | (defvar x-menu-item-width 0) |
| 41 | (defvar x-menu-items-alist nil) |
| 42 | (defvar x-menu-assoc-buffer nil) |
| 43 | |
| 44 | (defvar x-menu-item-spacing 1 |
| 45 | "*Minimum horizontal spacing between objects in a permanent X menu.") |
| 46 | |
| 47 | (defun x-menu-create-menu (name) |
| 48 | "Create a permanent X menu. |
| 49 | Returns an item which should be used as a |
| 50 | menu object whenever referring to the menu." |
| 51 | (let ((old (current-buffer)) |
| 52 | (buf (get-buffer-create name))) |
| 53 | (set-buffer buf) |
| 54 | (x-menu-mode) |
| 55 | (setq x-menu-assoc-buffer old) |
| 56 | (set-buffer old) |
| 57 | buf)) |
| 58 | |
| 59 | (defun x-menu-change-associated-buffer (menu buffer) |
| 60 | "Change associated buffer of MENU to BUFFER. |
| 61 | BUFFER should be a buffer object." |
| 62 | (let ((old (current-buffer))) |
| 63 | (set-buffer menu) |
| 64 | (setq x-menu-assoc-buffer buffer) |
| 65 | (set-buffer old))) |
| 66 | |
| 67 | (defun x-menu-add-item (menu item binding) |
| 68 | "Add to MENU an item with name ITEM, associated with BINDING. |
| 69 | Following a sequence of calls to x-menu-add-item, a call to x-menu-compute |
| 70 | should be performed before the menu will be made available to the user. |
| 71 | |
| 72 | BINDING should be a function of one argument, which is the numerical |
| 73 | button/key code as defined in x-menu.el." |
| 74 | (let ((old (current-buffer)) |
| 75 | elt) |
| 76 | (set-buffer menu) |
| 77 | (if (setq elt (assoc item x-menu-items-alist)) |
| 78 | (rplacd elt binding) |
| 79 | (setq x-menu-items-alist (append x-menu-items-alist |
| 80 | (list (cons item binding))))) |
| 81 | (set-buffer old) |
| 82 | item)) |
| 83 | |
| 84 | (defun x-menu-delete-item (menu item) |
| 85 | "Delete from MENU the item named ITEM. |
| 86 | Call `x-menu-compute' before making the menu available to the user." |
| 87 | (let ((old (current-buffer)) |
| 88 | elt) |
| 89 | (set-buffer menu) |
| 90 | (if (setq elt (assoc item x-menu-items-alist)) |
| 91 | (rplaca elt nil)) |
| 92 | (set-buffer old) |
| 93 | item)) |
| 94 | |
| 95 | (defun x-menu-activate (menu) |
| 96 | "Compute all necessary parameters for MENU. |
| 97 | This must be called whenever a menu is modified before it is made |
| 98 | available to the user. This also creates the menu itself." |
| 99 | (let ((buf (current-buffer))) |
| 100 | (pop-to-buffer menu) |
| 101 | (let (buffer-read-only) |
| 102 | (setq x-menu-max-width (1- (frame-width))) |
| 103 | (setq x-menu-item-width 0) |
| 104 | (let (items-head |
| 105 | (items-tail x-menu-items-alist)) |
| 106 | (while items-tail |
| 107 | (if (car (car items-tail)) |
| 108 | (progn (setq items-head (cons (car items-tail) items-head)) |
| 109 | (setq x-menu-item-width |
| 110 | (max x-menu-item-width |
| 111 | (length (car (car items-tail))))))) |
| 112 | (setq items-tail (cdr items-tail))) |
| 113 | (setq x-menu-items-alist (reverse items-head))) |
| 114 | (setq x-menu-item-width (+ x-menu-item-spacing x-menu-item-width)) |
| 115 | (setq x-menu-items-per-line |
| 116 | (max 1 (/ x-menu-max-width x-menu-item-width))) |
| 117 | (erase-buffer) |
| 118 | (let ((items-head x-menu-items-alist)) |
| 119 | (while items-head |
| 120 | (let ((items 0)) |
| 121 | (while (and items-head |
| 122 | (<= (setq items (1+ items)) x-menu-items-per-line)) |
| 123 | (insert (format (concat "%" |
| 124 | (int-to-string x-menu-item-width) "s") |
| 125 | (car (car items-head)))) |
| 126 | (setq items-head (cdr items-head)))) |
| 127 | (insert ?\n))) |
| 128 | (shrink-window (max 0 |
| 129 | (- (window-height) |
| 130 | (1+ (count-lines (point-min) (point-max)))))) |
| 131 | (goto-char (point-min))) |
| 132 | (pop-to-buffer buf))) |
| 133 | |
| 134 | (defun x-menu-pick-entry (position event) |
| 135 | "Internal function for dispatching on mouse/menu events" |
| 136 | (let* ((x (min (1- x-menu-items-per-line) |
| 137 | (/ (current-column) x-menu-item-width))) |
| 138 | (y (- (count-lines (point-min) (point)) |
| 139 | (if (zerop (current-column)) 0 1))) |
| 140 | (item (+ x (* y x-menu-items-per-line))) |
| 141 | (litem (cdr (nth item x-menu-items-alist)))) |
| 142 | (and litem (funcall litem event))) |
| 143 | (pop-to-buffer x-menu-assoc-buffer)) |
| 144 | |
| 145 | (provide 'x-menu) |
| 146 | |
| 147 | ;;; x-menu.el ends here |