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Allow scrolling while querying multiple choice

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* lisp/subr.el (read-multiple-choice): Allow scrolling the
buffer while querying (bug#22827).
This commit is contained in:
Lars Ingebrigtsen 2016-03-04 14:02:11 +00:00
parent 2d5b20f68c
commit cede502627
1 changed files with 27 additions and 1 deletions
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28
lisp/subr.el
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@ -2244,6 +2244,14 @@ might be shortened), and the third, optional entry is a longer
explanation that will be displayed in a help buffer if the user
requests more help.
This function translates user input into responses by consulting
the bindings in `query-replace-map'; see the documentation of
that variable for more information. In this case, the useful
bindings are `recenter', `scroll-up', and `scroll-down'. If the
user enters `recenter', `scroll-up', or `scroll-down' responses,
perform the requested window recentering or scrolling and ask
again.
The return value is the matching entry from the CHOICES list.
Usage example:
@ -2314,9 +2322,27 @@ Usage example:
(let ((cursor-in-echo-area t))
(read-char))
(error nil))))
(setq answer (lookup-key query-replace-map (vector tchar) t))
(setq tchar
(cond
((eq answer 'recenter)
(recenter) t)
((eq answer 'scroll-up)
(ignore-errors (scroll-up-command)) t)
((eq answer 'scroll-down)
(ignore-errors (scroll-down-command)) t)
((eq answer 'scroll-other-window)
(ignore-errors (scroll-other-window)) t)
((eq answer 'scroll-other-window-down)
(ignore-errors (scroll-other-window-down)) t)
(t tchar)))
(when (eq tchar t)
(setq wrong-char nil
tchar nil))
;; The user has entered an invalid choice, so display the
;; help messages.
(when (not (assq tchar choices))
(when (and (not (eq tchar nil))
(not (assq tchar choices)))
(setq wrong-char (not (memq tchar '(?? ?\C-h)))
tchar nil)
(when wrong-char