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b670783a | 1 | ;;; tooltip.el --- show tooltip windows |
7840ced1 | 2 | |
0d30b337 TTN |
3 | ;; Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, |
4 | ;; 2005 Free Software Foundation, Inc. | |
7840ced1 GM |
5 | |
6 | ;; Author: Gerd Moellmann <gerd@acm.org> | |
7 | ;; Keywords: help c mouse tools | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
086add15 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
7840ced1 GM |
25 | |
26 | ;;; Commentary: | |
27 | ||
7840ced1 GM |
28 | ;;; Code: |
29 | ||
5673b222 JB |
30 | (defvar comint-prompt-regexp) |
31 | ||
7840ced1 GM |
32 | ;;; Customizable settings |
33 | ||
34 | (defgroup tooltip nil | |
35 | "Customization group for the `tooltip' package." | |
36 | :group 'help | |
3e6ed970 | 37 | :group 'gud |
7840ced1 GM |
38 | :group 'mouse |
39 | :group 'tools | |
01b23b99 | 40 | :version "21.1" |
7840ced1 GM |
41 | :tag "Tool Tips") |
42 | ||
88751b11 | 43 | (defcustom tooltip-delay 0.7 |
7840ced1 GM |
44 | "Seconds to wait before displaying a tooltip the first time." |
45 | :tag "Delay" | |
46 | :type 'number | |
47 | :group 'tooltip) | |
48 | ||
7840ced1 GM |
49 | (defcustom tooltip-short-delay 0.1 |
50 | "Seconds to wait between subsequent tooltips on different items." | |
51 | :tag "Short delay" | |
52 | :type 'number | |
53 | :group 'tooltip) | |
54 | ||
7840ced1 | 55 | (defcustom tooltip-recent-seconds 1 |
01b23b99 DL |
56 | "Display tooltips if changing tip items within this many seconds. |
57 | Do so after `tooltip-short-delay'." | |
7840ced1 GM |
58 | :tag "Recent seconds" |
59 | :type 'number | |
60 | :group 'tooltip) | |
61 | ||
88751b11 | 62 | (defcustom tooltip-hide-delay 10 |
a93c8ba8 GM |
63 | "Hide tooltips automatically after this many seconds." |
64 | :tag "Hide delay" | |
65 | :type 'number | |
66 | :group 'tooltip) | |
67 | ||
5fddd8e6 | 68 | (defcustom tooltip-x-offset 5 |
37a29d46 | 69 | "X offset, in pixels, for the display of tooltips. |
e4df9b40 GM |
70 | The offset is relative to the position of the mouse. It must |
71 | be chosen so that the tooltip window doesn't contain the mouse | |
5fddd8e6 | 72 | when it pops up. |
7142670a EZ |
73 | |
74 | If `tooltip-frame-parameters' includes the `left' parameter, | |
75 | the value of `tooltip-x-offset' is ignored." | |
e4df9b40 | 76 | :tag "X offset" |
5fddd8e6 | 77 | :type 'integer |
e4df9b40 GM |
78 | :group 'tooltip) |
79 | ||
5fddd8e6 | 80 | (defcustom tooltip-y-offset +40 |
37a29d46 | 81 | "Y offset, in pixels, for the display of tooltips. |
e4df9b40 GM |
82 | The offset is relative to the position of the mouse. It must |
83 | be chosen so that the tooltip window doesn't contain the mouse | |
5fddd8e6 | 84 | when it pops up. |
7142670a EZ |
85 | |
86 | If `tooltip-frame-parameters' includes the `top' parameter, | |
87 | the value of `tooltip-y-offset' is ignored." | |
e4df9b40 | 88 | :tag "Y offset" |
5fddd8e6 | 89 | :type 'integer |
e4df9b40 GM |
90 | :group 'tooltip) |
91 | ||
7840ced1 GM |
92 | (defcustom tooltip-frame-parameters |
93 | '((name . "tooltip") | |
5fddd8e6 | 94 | (internal-border-width . 2) |
7840ced1 | 95 | (border-width . 1)) |
7142670a EZ |
96 | "Frame parameters used for tooltips. |
97 | ||
98 | If `left' or `top' parameters are included, they specify the absolute | |
99 | position to pop up the tooltip." | |
7840ced1 GM |
100 | :type 'sexp |
101 | :tag "Frame Parameters" | |
102 | :group 'tooltip) | |
103 | ||
2621f5a9 GM |
104 | (defface tooltip |
105 | '((((class color)) | |
39440204 JPW |
106 | :background "lightyellow" |
107 | :foreground "black" | |
108 | :inherit variable-pitch) | |
109 | (t | |
110 | :inherit variable-pitch)) | |
2621f5a9 | 111 | "Face for tooltips." |
daf96a41 JL |
112 | :group 'tooltip |
113 | :group 'basic-faces) | |
2621f5a9 | 114 | |
90aff7c6 NR |
115 | (defcustom tooltip-use-echo-area nil |
116 | "Use the echo area instead of tooltip frames for help and GUD tooltips." | |
117 | :type 'boolean | |
118 | :tag "Use echo area" | |
119 | :group 'tooltip) | |
120 | ||
7840ced1 GM |
121 | \f |
122 | ;;; Variables that are not customizable. | |
123 | ||
124 | (defvar tooltip-hook nil | |
125 | "Functions to call to display tooltips. | |
126 | Each function is called with one argument EVENT which is a copy of | |
127 | the last mouse movement event that occurred.") | |
128 | ||
7840ced1 GM |
129 | (defvar tooltip-timeout-id nil |
130 | "The id of the timeout started when Emacs becomes idle.") | |
131 | ||
7840ced1 GM |
132 | (defvar tooltip-last-mouse-motion-event nil |
133 | "A copy of the last mouse motion event seen.") | |
134 | ||
7840ced1 GM |
135 | (defvar tooltip-hide-time nil |
136 | "Time when the last tooltip was hidden.") | |
137 | ||
1af98f07 RS |
138 | (defvar gud-tooltip-mode) ;; Prevent warning. |
139 | ||
7840ced1 GM |
140 | ;;; Event accessors |
141 | ||
142 | (defun tooltip-event-buffer (event) | |
143 | "Return the buffer over which event EVENT occurred. | |
144 | This might return nil if the event did not occur over a buffer." | |
145 | (let ((window (posn-window (event-end event)))) | |
146 | (and window (window-buffer window)))) | |
147 | ||
7840ced1 GM |
148 | ;;; Switching tooltips on/off |
149 | ||
150 | ;; We don't set track-mouse globally because this is a big redisplay | |
151 | ;; problem in buffers having a pre-command-hook or such installed, | |
152 | ;; which does a set-buffer, like the summary buffer of Gnus. Calling | |
153 | ;; set-buffer prevents redisplay optimizations, so every mouse motion | |
154 | ;; would be accompanied by a full redisplay. | |
155 | ||
8bc973e9 NR |
156 | (define-minor-mode tooltip-mode |
157 | "Toggle Tooltip display. | |
7840ced1 | 158 | With ARG, turn tooltip mode on if and only if ARG is positive." |
8bc973e9 | 159 | :global t |
d5e2843d | 160 | :init-value (not (or noninteractive |
5eca5ecd | 161 | emacs-basic-display |
5fc54662 | 162 | (not (display-graphic-p)) |
d5e2843d | 163 | (not (fboundp 'x-show-tip)))) |
5fc54662 | 164 | :initialize 'custom-initialize-safe-default |
8bc973e9 | 165 | :group 'tooltip |
ef75a647 | 166 | (unless (or (null tooltip-mode) (fboundp 'x-show-tip)) |
c6da4eb4 | 167 | (error "Sorry, tooltips are not yet available on this system")) |
a93d8344 NR |
168 | (if tooltip-mode |
169 | (progn | |
170 | (add-hook 'pre-command-hook 'tooltip-hide) | |
171 | (add-hook 'tooltip-hook 'tooltip-help-tips)) | |
172 | (unless (and (boundp 'gud-tooltip-mode) gud-tooltip-mode) | |
173 | (remove-hook 'pre-command-hook 'tooltip-hide)) | |
174 | (remove-hook 'tooltip-hook 'tooltip-help-tips)) | |
175 | (setq show-help-function | |
90aff7c6 | 176 | (if tooltip-mode 'tooltip-show-help nil))) |
dea87733 | 177 | |
7840ced1 GM |
178 | \f |
179 | ;;; Timeout for tooltip display | |
180 | ||
7840ced1 GM |
181 | (defun tooltip-delay () |
182 | "Return the delay in seconds for the next tooltip." | |
183 | (let ((delay tooltip-delay) | |
a1f84f6d | 184 | (now (float-time))) |
7840ced1 GM |
185 | (when (and tooltip-hide-time |
186 | (< (- now tooltip-hide-time) tooltip-recent-seconds)) | |
187 | (setq delay tooltip-short-delay)) | |
188 | delay)) | |
189 | ||
06f76f9f | 190 | (defun tooltip-cancel-delayed-tip () |
7840ced1 GM |
191 | "Disable the tooltip timeout." |
192 | (when tooltip-timeout-id | |
193 | (disable-timeout tooltip-timeout-id) | |
194 | (setq tooltip-timeout-id nil))) | |
195 | ||
06f76f9f | 196 | (defun tooltip-start-delayed-tip () |
04cedb11 | 197 | "Add a one-shot timeout to call function `tooltip-timeout'." |
7840ced1 GM |
198 | (setq tooltip-timeout-id |
199 | (add-timeout (tooltip-delay) 'tooltip-timeout nil))) | |
200 | ||
7840ced1 | 201 | (defun tooltip-timeout (object) |
04cedb11 | 202 | "Function called when timer with id `tooltip-timeout-id' fires." |
7840ced1 GM |
203 | (run-hook-with-args-until-success 'tooltip-hook |
204 | tooltip-last-mouse-motion-event)) | |
205 | ||
7840ced1 | 206 | \f |
7840ced1 GM |
207 | ;;; Displaying tips |
208 | ||
2621f5a9 | 209 | (defun tooltip-set-param (alist key value) |
4b2bb9be | 210 | "Change the value of KEY in alist ALIST to VALUE. |
f1180544 | 211 | If there's no association for KEY in ALIST, add one, otherwise |
2621f5a9 GM |
212 | change the existing association. Value is the resulting alist." |
213 | (let ((param (assq key alist))) | |
214 | (if (consp param) | |
215 | (setcdr param value) | |
216 | (push (cons key value) alist)) | |
217 | alist)) | |
218 | ||
cae07240 | 219 | (defun tooltip-show (text &optional use-echo-area) |
7142670a EZ |
220 | "Show a tooltip window displaying TEXT. |
221 | ||
1d6197fb | 222 | Text larger than `x-max-tooltip-size' is clipped. |
7142670a EZ |
223 | |
224 | If the alist in `tooltip-frame-parameters' includes `left' and `top' | |
225 | parameters, they determine the x and y position where the tooltip | |
226 | is displayed. Otherwise, the tooltip pops at offsets specified by | |
227 | `tooltip-x-offset' and `tooltip-y-offset' from the current mouse | |
1d6197fb NR |
228 | position. |
229 | ||
cae07240 KS |
230 | Optional second arg USE-ECHO-AREA non-nil means to show tooltip |
231 | in echo area." | |
232 | (if use-echo-area | |
72200f89 | 233 | (message "%s" text) |
e5603149 | 234 | (condition-case error |
2621f5a9 GM |
235 | (let ((params (copy-sequence tooltip-frame-parameters)) |
236 | (fg (face-attribute 'tooltip :foreground)) | |
237 | (bg (face-attribute 'tooltip :background))) | |
06f76f9f GM |
238 | (when (stringp fg) |
239 | (setq params (tooltip-set-param params 'foreground-color fg)) | |
240 | (setq params (tooltip-set-param params 'border-color fg))) | |
241 | (when (stringp bg) | |
242 | (setq params (tooltip-set-param params 'background-color bg))) | |
2621f5a9 GM |
243 | (x-show-tip (propertize text 'face 'tooltip) |
244 | (selected-frame) | |
f3b05e99 | 245 | params |
a93c8ba8 | 246 | tooltip-hide-delay |
2621f5a9 GM |
247 | tooltip-x-offset |
248 | tooltip-y-offset)) | |
f1180544 | 249 | (error |
e5603149 GM |
250 | (message "Error while displaying tooltip: %s" error) |
251 | (sit-for 1) | |
252 | (message "%s" text))))) | |
253 | ||
7840ced1 GM |
254 | (defun tooltip-hide (&optional ignored-arg) |
255 | "Hide a tooltip, if one is displayed. | |
256 | Value is non-nil if tooltip was open." | |
06f76f9f | 257 | (tooltip-cancel-delayed-tip) |
7840ced1 | 258 | (when (x-hide-tip) |
a1f84f6d | 259 | (setq tooltip-hide-time (float-time)))) |
7840ced1 | 260 | |
7840ced1 GM |
261 | \f |
262 | ;;; Debugger-related functions | |
263 | ||
264 | (defun tooltip-identifier-from-point (point) | |
265 | "Extract the identifier at POINT, if any. | |
266 | Value is nil if no identifier exists at point. Identifier extraction | |
267 | is based on the current syntax table." | |
268 | (save-excursion | |
269 | (goto-char point) | |
270 | (let ((start (progn (skip-syntax-backward "w_") (point)))) | |
271 | (unless (looking-at "[0-9]") | |
272 | (skip-syntax-forward "w_") | |
273 | (when (> (point) start) | |
274 | (buffer-substring start (point))))))) | |
275 | ||
7840ced1 GM |
276 | (defmacro tooltip-region-active-p () |
277 | "Value is non-nil if the region is currently active." | |
278 | (if (string-match "^GNU" (emacs-version)) | |
279 | `(and transient-mark-mode mark-active) | |
280 | `(region-active-p))) | |
281 | ||
7840ced1 GM |
282 | (defun tooltip-expr-to-print (event) |
283 | "Return an expression that should be printed for EVENT. | |
284 | If a region is active and the mouse is inside the region, print | |
285 | the region. Otherwise, figure out the identifier around the point | |
286 | where the mouse is." | |
287 | (save-excursion | |
288 | (set-buffer (tooltip-event-buffer event)) | |
289 | (let ((point (posn-point (event-end event)))) | |
290 | (if (tooltip-region-active-p) | |
291 | (when (and (<= (region-beginning) point) (<= point (region-end))) | |
292 | (buffer-substring (region-beginning) (region-end))) | |
293 | (tooltip-identifier-from-point point))))) | |
294 | ||
7840ced1 GM |
295 | (defun tooltip-process-prompt-regexp (process) |
296 | "Return regexp matching the prompt of PROCESS at the end of a string. | |
04cedb11 JB |
297 | The prompt is taken from the value of `comint-prompt-regexp' in |
298 | the buffer of PROCESS." | |
7840ced1 GM |
299 | (let ((prompt-regexp (save-excursion |
300 | (set-buffer (process-buffer process)) | |
301 | comint-prompt-regexp))) | |
302 | ;; Most start with `^' but the one for `sdb' cannot be easily | |
303 | ;; stripped. Code the prompt for `sdb' fixed here. | |
304 | (if (= (aref prompt-regexp 0) ?^) | |
305 | (setq prompt-regexp (substring prompt-regexp 1)) | |
306 | (setq prompt-regexp "\\*")) | |
307 | (concat "\n*" prompt-regexp "$"))) | |
308 | ||
7840ced1 GM |
309 | (defun tooltip-strip-prompt (process output) |
310 | "Return OUTPUT with any prompt of PROCESS stripped from its end." | |
311 | (let ((prompt-regexp (tooltip-process-prompt-regexp process))) | |
312 | (save-match-data | |
313 | (when (string-match prompt-regexp output) | |
314 | (setq output (substring output 0 (match-beginning 0))))) | |
315 | output)) | |
316 | ||
7840ced1 | 317 | \f |
7840ced1 GM |
318 | ;;; Tooltip help. |
319 | ||
320 | (defvar tooltip-help-message nil | |
90aff7c6 | 321 | "The last help message received via `tooltip-show-help'.") |
7840ced1 | 322 | |
90aff7c6 | 323 | (defun tooltip-show-help (msg) |
7840ced1 GM |
324 | "Function installed as `show-help-function'. |
325 | MSG is either a help string to display, or nil to cancel the display." | |
86f0d417 | 326 | (let ((previous-help tooltip-help-message)) |
7840ced1 GM |
327 | (setq tooltip-help-message msg) |
328 | (cond ((null msg) | |
06f76f9f GM |
329 | ;; Cancel display. This also cancels a delayed tip, if |
330 | ;; there is one. | |
7840ced1 | 331 | (tooltip-hide)) |
06f76f9f GM |
332 | ((equal previous-help msg) |
333 | ;; Same help as before (but possibly the mouse has moved). | |
334 | ;; Keep what we have. | |
335 | ) | |
7840ced1 | 336 | (t |
f1180544 | 337 | ;; A different help. Remove a previous tooltip, and |
06f76f9f GM |
338 | ;; display a new one, with some delay. |
339 | (tooltip-hide) | |
340 | (tooltip-start-delayed-tip))))) | |
7840ced1 | 341 | |
7840ced1 GM |
342 | (defun tooltip-help-tips (event) |
343 | "Hook function to display a help tooltip. | |
06f76f9f | 344 | This is installed on the hook `tooltip-hook', which is run when |
04cedb11 | 345 | the timer with id `tooltip-timeout-id' fires. |
7840ced1 GM |
346 | Value is non-nil if this function handled the tip." |
347 | (when (stringp tooltip-help-message) | |
90aff7c6 | 348 | (tooltip-show tooltip-help-message tooltip-use-echo-area) |
7840ced1 GM |
349 | t)) |
350 | ||
5ce0fb91 | 351 | (provide 'tooltip) |
7840ced1 | 352 | |
18385083 | 353 | ;; arch-tag: 3d61135e-4618-4a78-af28-183f6df5636f |
7840ced1 | 354 | ;;; tooltip.el ends here |