The standard library tooltip.el provides the function for displaying a tooltip at mouse position which allows users to easily show it. However, locating tooltip at arbitrary buffer position in window is not easy. This program provides such function to be used by other frontend programs.
This program is tested on GNU Emacs 22, 23 under X window system and Emacs 23 for MS-Windows.
To use pos-tip.el, save this file in a directory listed in load-path together with the programs which use this library, and put the following in your .emacs file:
To use the full features of this program on MS-Windows, put the additional setting in .emacs file:
(pos-tip-w32-max-width-height) ; Maximize frame temporarily
(pos-tip-w32-max-width-height t) ; Keep frame maximized
(defun my-describe-function (function) "Display the full documentation of FUNCTION (a symbol) in tooltip." (interactive (list (function-called-at-point))) (if (null function) (pos-tip-show "** You didn't specify a function! **" '("red")) (pos-tip-show (with-temp-buffer (let ((standard-output (current-buffer)) (help-xref-following t)) (prin1 function) (princ " is ") (describe-function-1 function) (buffer-string))) nil nil nil 0)))
(define-key emacs-lisp-mode-map (kbd "C-;") 'my-describe-function)
You can also try the package clippy.el. It does the same thing with a little twist :)
popup.el itself can show tooltip to display annotation of the menu items, but it’s unreadable when window is small. Here are two solutions for this problem.
Put the following to your .emacs file:
(defadvice popup-menu-show-quick-help (around pos-tip-popup-menu-show-quick-help () activate) "Show quick help using `pos-tip-show'." (if (eq window-system 'x) (let ((doc (popup-menu-document menu (or item (popup-selected-item menu))))) (when (stringp doc) (pos-tip-show doc nil (if (popup-hidden-p menu) (or (plist-get args :point) (point)) (overlay-end (popup-line-overlay menu (+ (popup-offset menu) (popup-selected-line menu))))) nil 0) nil)) ad-do-it))
popup-pos-tip.el is pos-tip.el wrapper library for programs using popup.el.
Save this file as popup-pos-tip.el in a directory that is listed in load-path, and add the following to .emacs:
(require 'popup-pos-tip) (defadvice popup-tip (around popup-pos-tip-wrapper (string &rest args) activate) (if (eq window-system 'x) (apply 'popup-pos-tip string args) ad-do-it))
;; *Change the following lines according to your environment* (setq sdic-inline-eiwa-dictionary "/usr/share/dict/gene.sdic") (setq sdic-inline-waei-dictionary "/usr/share/dict/jedict.sdic")
;; The following is optional. Uncomment if necessary. ;; (mapc (lambda (mode) ;; (add-to-list 'sdic-inline-enable-modes mode)) ;; '(help-mode Info-mode)) ;; (mapc (lambda (face) ;; (add-to-list 'sdic-inline-enable-faces face)) ;; '(font-lock-doc-face))
(setq sdic-inline-search-func 'sdic-inline-search-word-with-stem) (setq sdic-inline-display-func 'sdic-inline-pos-tip-show)
(define-key sdic-inline-map "\C-c\C-p" 'sdic-inline-pos-tip-show)
Some unsolicited feedback. ;-)
*xwininfo*, after the
/usr/bin/bash: xwininfo: command not found. I’m using Cygwin (and Windows). Please state in the file’s Commentary what the prerequisites are (and which Emacs versions are supported).
‘tooltip-show’(calling it, e.g.
‘my-tooltip-show’), and then add this to the body:
(when left (setq params (tooltip-set-param params 'left left))) (when top (setq params (tooltip-set-param params 'top top)))
I agree that it is too bad that there is no simple way to show a tooltip at a specified position. The code should not be tightly coupled to a mouse position, as it is currently. Perhaps you can suggest a change to the Emacs developers, to allow passing the display position explicitly. – DrewAdams
‘tooltip-show’is insufficient because tooltip immediately vanishes if it overlaps with mouse pointer.
‘pos-tip-show’can move out mouse pointer. – irie
‘top’locations, contradicting the doc strings of both
‘tooltip-frame-parameters’. In Emacs 23, it always uses the mouse pointer location, which is wrong. – DrewAdams
‘top’properties of tooltip are useless in non-X environments. – irie
(frame-parameters)in a console (i.e. non-graphic) frame does not have
‘top’to let you know where it is or let you position it. I suppose there’s no way to let you (Emacs) control this.
‘window-edges’will give you the location of a window wrt its frame, and
‘frame-parameters’will give you the location of the frame (except for a console frame). – DrewAdams
‘window-edges’returns the location of window relative to a X window corresponding to
‘frame-parameter’returns the location of a X window corresponding to
‘parent-id’. That is, these two functions regard the different X windows as
‘frame’. Unfortunately, there is no way to obtain the tool-bar height etc. without calling external programs like
xwininfo. – irie
M-x report-emacs-bug– DrewAdams
There is a simple function point-to-coord in ourcomments-util.el in nXhtml that I have suggested adding to Emacs (without success yet) which I have been using for poping up a menu at point. Maybe this can be merged with pos-tip-compute-pixel-position here? – LennartBorgman
‘point-to-coord’returns the pixel position relative to top left corner of frame, but tooltip must be specified it relative to top left corner of display because tooltip itself is a small frame. – irie
Yes, but shouldn’t it be easy to translate to that format? – LennartBorgman
‘posn-at-point’in Emacs for MS-Windows by using Wine, and found that the calculation of absolute coordinates need additional information, the menu-bar height and the width of frame extents (including the title-bar height). At least Emacs doesn’t provide functions which return these amounts. – irie
Maybe you can propose some new function for Emacs that would make it possible?
pos-tip.el uses UTF-8, the first line should read
pos-tip.el -- Show tooltip at point -*- coding: utf-8 -*-
‘pos-tip-show-no-propertize’ passes a
‘foreground-color’ property to
‘x-show-tip’ (line 364), but it has no effect at all, at least in my system. So I’m using this temporal fix:
(defadvice pos-tip-show-no-propertize (before fix-pos-tip-foreground-color) (let ((fg (...))) (ad-set-arg 0 (propertize (ad-get-arg 0) 'face `(cons (foreground-color . ,fg) 'pos-tip-temp)))))
Is this a real bug? or is there any better solution? – SeungcheolJung?
‘pos-tip-show-no-propertize’always shows tooltip text with
‘default’face. – irie
‘-q’… I’m not sure what other elisps mess up it.
‘default-frame-alist’affects foreground color of tooltips made by
‘x-show-tip’. Am I right? – SeungcheolJung?
‘default’face, the foreground colour of the frame is no longer used for drawing text, and instead the colour from the
‘default’face is used. So, essentially, there’s no way to set foreground colour of tooltip text using
‘x-show-tip’, but also face property of the text to display. I used the same approach, and seems to have fixed the issue. However, I also had problem with showing the first tooltip after launching Emacs that seemed to be related with pos-tip using
‘make-face’to create a temporary face for use inside
‘pos-tip-show’. I have replaced that with passing a list of face attributes to
‘propertize’, but I have no idea if I haven’t just broken backwards compatibility.