1 ;;; tooltip.el --- show tooltip windows
3 ;; Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005 Free Software Foundation, Inc.
6 ;; Author: Gerd Moellmann <gerd@acm.org>
7 ;; Keywords: help c mouse tools
9 ;; This file is part of GNU Emacs.
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)
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.
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
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
30 (defvar comint-prompt-regexp
)
32 ;;; Customizable settings
35 "Customization group for the `tooltip' package."
43 (defcustom tooltip-delay
0.7
44 "Seconds to wait before displaying a tooltip the first time."
49 (defcustom tooltip-short-delay
0.1
50 "Seconds to wait between subsequent tooltips on different items."
55 (defcustom tooltip-recent-seconds
1
56 "Display tooltips if changing tip items within this many seconds.
57 Do so after `tooltip-short-delay'."
62 (defcustom tooltip-hide-delay
10
63 "Hide tooltips automatically after this many seconds."
68 (defcustom tooltip-x-offset
5
69 "X offset, in pixels, for the display of tooltips.
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
74 If `tooltip-frame-parameters' includes the `left' parameter,
75 the value of `tooltip-x-offset' is ignored."
80 (defcustom tooltip-y-offset
+40
81 "Y offset, in pixels, for the display of tooltips.
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
86 If `tooltip-frame-parameters' includes the `top' parameter,
87 the value of `tooltip-y-offset' is ignored."
92 (defcustom tooltip-frame-parameters
94 (internal-border-width .
2)
96 "Frame parameters used for tooltips.
98 If `left' or `top' parameters are included, they specify the absolute
99 position to pop up the tooltip."
101 :tag
"Frame Parameters"
106 :background
"lightyellow"
108 :inherit variable-pitch
)
110 :inherit variable-pitch
))
115 (defcustom tooltip-use-echo-area nil
116 "Use the echo area instead of tooltip frames for help and GUD tooltips."
122 ;;; Variables that are not customizable.
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.")
129 (defvar tooltip-timeout-id nil
130 "The id of the timeout started when Emacs becomes idle.")
132 (defvar tooltip-last-mouse-motion-event nil
133 "A copy of the last mouse motion event seen.")
135 (defvar tooltip-hide-time nil
136 "Time when the last tooltip was hidden.")
138 (defvar gud-tooltip-mode
) ;; Prevent warning.
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
))))
148 ;;; Switching tooltips on/off
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.
156 (define-minor-mode tooltip-mode
157 "Toggle Tooltip display.
158 With ARG, turn tooltip mode on if and only if ARG is positive."
160 :init-value
(not (or noninteractive
162 (not (display-graphic-p))
163 (not (fboundp 'x-show-tip
))))
164 :initialize
'custom-initialize-safe-default
166 (unless (or (null tooltip-mode
) (fboundp 'x-show-tip
))
167 (error "Sorry, tooltips are not yet available on this system"))
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
176 (if tooltip-mode
'tooltip-show-help nil
)))
179 ;;; Timeout for tooltip display
181 (defun tooltip-delay ()
182 "Return the delay in seconds for the next tooltip."
183 (let ((delay tooltip-delay
)
185 (when (and tooltip-hide-time
186 (< (- now tooltip-hide-time
) tooltip-recent-seconds
))
187 (setq delay tooltip-short-delay
))
190 (defun tooltip-cancel-delayed-tip ()
191 "Disable the tooltip timeout."
192 (when tooltip-timeout-id
193 (disable-timeout tooltip-timeout-id
)
194 (setq tooltip-timeout-id nil
)))
196 (defun tooltip-start-delayed-tip ()
197 "Add a one-shot timeout to call function `tooltip-timeout'."
198 (setq tooltip-timeout-id
199 (add-timeout (tooltip-delay) 'tooltip-timeout nil
)))
201 (defun tooltip-timeout (object)
202 "Function called when timer with id `tooltip-timeout-id' fires."
203 (run-hook-with-args-until-success 'tooltip-hook
204 tooltip-last-mouse-motion-event
))
209 (defun tooltip-set-param (alist key value
)
210 "Change the value of KEY in alist ALIST to VALUE.
211 If there's no association for KEY in ALIST, add one, otherwise
212 change the existing association. Value is the resulting alist."
213 (let ((param (assq key alist
)))
216 (push (cons key value
) alist
))
219 (defun tooltip-show (text &optional use-echo-area
)
220 "Show a tooltip window displaying TEXT.
222 Text larger than `x-max-tooltip-size' is clipped.
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
230 Optional second arg USE-ECHO-AREA non-nil means to show tooltip
234 (condition-case error
235 (let ((params (copy-sequence tooltip-frame-parameters
))
236 (fg (face-attribute 'tooltip
:foreground
))
237 (bg (face-attribute 'tooltip
:background
)))
239 (setq params
(tooltip-set-param params
'foreground-color fg
))
240 (setq params
(tooltip-set-param params
'border-color fg
)))
242 (setq params
(tooltip-set-param params
'background-color bg
)))
243 (x-show-tip (propertize text
'face
'tooltip
)
250 (message "Error while displaying tooltip: %s" error
)
252 (message "%s" text
)))))
254 (defun tooltip-hide (&optional ignored-arg
)
255 "Hide a tooltip, if one is displayed.
256 Value is non-nil if tooltip was open."
257 (tooltip-cancel-delayed-tip)
259 (setq tooltip-hide-time
(float-time))))
262 ;;; Debugger-related functions
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."
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)))))))
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
)
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
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
)))))
295 (defun tooltip-process-prompt-regexp (process)
296 "Return regexp matching the prompt of PROCESS at the end of a string.
297 The prompt is taken from the value of `comint-prompt-regexp' in
298 the buffer of PROCESS."
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
"$")))
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
)))
313 (when (string-match prompt-regexp output
)
314 (setq output
(substring output
0 (match-beginning 0)))))
320 (defvar tooltip-help-message nil
321 "The last help message received via `tooltip-show-help'.")
323 (defun tooltip-show-help (msg)
324 "Function installed as `show-help-function'.
325 MSG is either a help string to display, or nil to cancel the display."
326 (let ((previous-help tooltip-help-message
))
327 (setq tooltip-help-message msg
)
329 ;; Cancel display. This also cancels a delayed tip, if
332 ((equal previous-help msg
)
333 ;; Same help as before (but possibly the mouse has moved).
334 ;; Keep what we have.
337 ;; A different help. Remove a previous tooltip, and
338 ;; display a new one, with some delay.
340 (tooltip-start-delayed-tip)))))
342 (defun tooltip-help-tips (event)
343 "Hook function to display a help tooltip.
344 This is installed on the hook `tooltip-hook', which is run when
345 the timer with id `tooltip-timeout-id' fires.
346 Value is non-nil if this function handled the tip."
347 (when (stringp tooltip-help-message
)
348 (tooltip-show tooltip-help-message tooltip-use-echo-area
)
353 ;; arch-tag: 3d61135e-4618-4a78-af28-183f6df5636f
354 ;;; tooltip.el ends here