Mercurial > hg > xemacs-beta
annotate lisp/mode-motion.el @ 5818:15b0715c204d
Avoid passing patterns to with charset property to FcNameUnparse.
Prevents crash reported by Raymond Toy.
| author | Stephen J. Turnbull <stephen@xemacs.org> |
|---|---|
| date | Sat, 18 Oct 2014 21:20:42 +0900 |
| parents | 308d34e9f07d |
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| rev | line source |
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| 428 | 1 ;;; mode-motion.el --- Mode-specific mouse-highlighting of text. |
| 2 | |
| 3 ;; Copyright (C) 1992, 1993, 1997 Free Software Foundation, Inc. | |
| 4 | |
| 5 ;; Maintainer: XEmacs Development Team | |
| 6 ;; Keywords: internal, mouse, dumped | |
| 7 | |
| 8 ;; This file is part of XEmacs. | |
| 9 | |
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10 ;; XEmacs is free software: you can redistribute it and/or modify it |
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11 ;; under the terms of the GNU General Public License as published by the |
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12 ;; Free Software Foundation, either version 3 of the License, or (at your |
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13 ;; option) any later version. |
| 428 | 14 |
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15 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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16 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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17 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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18 ;; for more details. |
| 428 | 19 |
| 20 ;; You should have received a copy of the GNU General Public License | |
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21 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 428 | 22 |
| 23 ;;; Synched up with: Not in FSF. | |
| 24 | |
| 25 ;;; Commentary: | |
| 26 | |
| 27 ;; This file is dumped with XEmacs (when window system support is compiled in). | |
| 28 | |
| 29 ;;; Code: | |
| 30 | |
| 31 (defvar mode-motion-hook nil | |
| 32 "Function or functions which are called whenever the mouse moves. | |
| 33 Each function must take a single argument of the motion event. | |
| 34 You should normally use this rather than `mouse-motion-handler', which | |
| 35 does some additional window-system-dependent things. This hook is local | |
| 36 to every buffer, and should normally be set up by major-modes which want | |
| 37 to use special highlighting. Every time the mouse moves over a window, | |
| 38 the mode-motion-hook of the buffer of that window is run.") | |
| 39 | |
| 40 (make-variable-buffer-local 'mode-motion-hook) | |
| 41 | |
| 42 (defvar mode-motion-extent nil) | |
| 43 (make-variable-buffer-local 'mode-motion-extent) | |
| 44 | |
| 45 (defvar mode-motion-help-echo-string nil | |
| 46 "String to be added as the 'help-echo property of the mode-motion extent. | |
| 47 In order for this to work, you need to add the hook function | |
| 48 `mode-motion-add-help-echo' to the mode-motion hook. If this is a function, | |
| 49 it will be called with one argument (the event) and should return a string | |
| 50 to be added. This variable is local to every buffer.") | |
| 51 (make-variable-buffer-local 'mode-motion-help-echo-string) | |
| 52 | |
| 53 (defun mode-motion-ensure-extent-ok (event) | |
| 54 (let ((buffer (event-buffer event))) | |
| 55 (if (and (extent-live-p mode-motion-extent) | |
| 56 (eq buffer (extent-object mode-motion-extent))) | |
| 57 nil | |
| 58 (setq mode-motion-extent (make-extent nil nil buffer)) | |
| 59 (set-extent-property mode-motion-extent 'mouse-face 'highlight)))) | |
| 60 | |
| 61 (defun mode-motion-highlight-internal (event backward forward) | |
| 62 (let* ((buffer (event-buffer event)) | |
| 63 (point (and buffer (event-point event)))) | |
| 64 (if (and buffer | |
| 65 (not (eq buffer mouse-grabbed-buffer))) | |
| 66 ;; #### ack!! Too many calls to save-window-excursion / | |
| 67 ;; save-excursion (x-track-pointer calls, so does | |
| 68 ;; minibuf-mouse-tracker ...) This needs to be looked | |
| 69 ;; into. It's complicated by the fact that sometimes | |
| 70 ;; a mode-motion-hook might really want to change | |
| 71 ;; the point. | |
| 72 ;; | |
| 73 ;; #### The save-excursion must come before the | |
| 74 ;; save-window-excursion in order to function properly. I | |
| 75 ;; haven't given this much thought. Is it a bug that this | |
| 76 ;; ordering is necessary or is it correct behavior? | |
| 77 (save-excursion | |
| 78 (save-window-excursion | |
| 79 (set-buffer buffer) | |
| 80 (mode-motion-ensure-extent-ok event) | |
| 81 (if point | |
| 82 ;; Use save-excursion here to avoid | |
| 83 ;; save-window-excursion seeing a change in | |
| 84 ;; window point's value which would make the | |
| 85 ;; display code do a whole lot of useless work | |
| 86 ;; and making the display flicker horribly. | |
| 87 (save-excursion | |
| 88 (goto-char point) | |
| 89 (condition-case nil (funcall backward) (error nil)) | |
| 90 (setq point (point)) | |
| 91 (condition-case nil (funcall forward) (error nil)) | |
| 92 (if (eq point (point)) | |
| 93 (detach-extent mode-motion-extent) | |
| 94 (set-extent-endpoints mode-motion-extent point (point)))) | |
| 95 ;; not over text; zero the extent. | |
| 96 (detach-extent mode-motion-extent))))))) | |
| 97 | |
| 98 (defun mode-motion-highlight-line (event) | |
| 99 "For use as the value of `mode-motion-hook' -- highlight line under mouse." | |
| 100 (mode-motion-highlight-internal event 'beginning-of-line 'end-of-line)) | |
| 101 | |
| 102 (defun mode-motion-highlight-word (event) | |
| 103 "For use as the value of `mode-motion-hook' -- highlight word under mouse." | |
| 104 (mode-motion-highlight-internal | |
| 105 event | |
| 106 #'(lambda () (default-mouse-track-beginning-of-word nil)) | |
| 107 #'(lambda () (default-mouse-track-end-of-word nil)))) | |
| 108 | |
| 109 (defun mode-motion-highlight-symbol (event) | |
| 110 "For use as the value of `mode-motion-hook' -- highlight symbol under mouse." | |
| 111 (mode-motion-highlight-internal | |
| 112 event | |
| 113 #'(lambda () (default-mouse-track-beginning-of-word t)) | |
| 114 #'(lambda () (default-mouse-track-end-of-word t)))) | |
| 115 | |
| 116 (defun mode-motion-highlight-sexp (event) | |
| 117 "For use as the value of `mode-motion-hook' -- highlight form under mouse." | |
| 118 (mode-motion-highlight-internal | |
| 119 event | |
| 120 #'(lambda () | |
| 121 (if (= (char-syntax (following-char)) ?\() | |
| 122 nil | |
| 123 (goto-char (scan-sexps (point) -1)))) | |
| 124 #'(lambda () | |
| 125 (if (= (char-syntax (following-char)) ?\)) | |
| 126 (forward-char 1)) | |
| 127 (goto-char (scan-sexps (point) 1))))) | |
| 128 | |
| 129 (defun mode-motion-add-help-echo (event) | |
| 130 "For use as the value of `mode-motion-hook' -- add a 'help-echo property. | |
| 131 This causes the string in the 'help-echo property to be displayed when the | |
| 132 mouse moves over the extent. See `mode-motion-help-echo-string' for | |
| 133 documentation on how to control the string that is added." | |
| 134 (mode-motion-ensure-extent-ok event) | |
| 135 (let ((string (cond ((null mode-motion-help-echo-string) nil) | |
| 136 ((stringp mode-motion-help-echo-string) | |
| 137 mode-motion-help-echo-string) | |
| 138 (t (funcall mode-motion-help-echo-string event))))) | |
| 139 (if (stringp string) | |
| 140 (set-extent-property mode-motion-extent 'help-echo string)))) | |
| 141 | |
| 142 | |
| 143 (provide 'mode-motion) | |
| 144 | |
| 145 ;;; mode-motion.el ends here |