[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#20100: 24.4.91; Can't scroll a window while in minibuffer
From: |
martin rudalics |
Subject: |
bug#20100: 24.4.91; Can't scroll a window while in minibuffer |
Date: |
Fri, 13 Mar 2015 17:58:04 +0100 |
> I'm trying to write a completion package using `read-from-minibuffer'
> combined with `post-command-hook'.
>
> Everything is working OK, except when I want to sync the current
> completion candidate (one of buffer's lines) with the corresponding line
> in the buffer.
>
> This code, specifically `recenter', doesn't work:
>
> (with-current-buffer buf
> (goto-char (point-min))
> (forward-line (1- num))
> (recenter))
I suppose that at the time you invoke `recenter', the selected window
doesn't show `buf'. When with emacs -Q I do
(let ((buffer (get-buffer-create "*buffer*"))
(line 0))
(set-window-buffer nil buffer)
(with-current-buffer buffer
(while (< line 100)
(insert (format "%02d\n" line))
(setq line (1+ line))))
(with-current-buffer buffer
(goto-char (point-min))
(forward-line 25)
(recenter)))
then I see the line starting with "25" centered in the selected window.
Can you try modifying my example such that it "doesn't work for you"?
> However, this code will scroll the window (`buf' and `wnd' correspond to
> each other):
>
> (with-current-buffer buf
> (goto-char (point-min))
> (forward-line (1- num))
> (setf (window-point wnd)
> (point)))
The fact that you apparently have to
(setf (window-point wnd) (point))
seems to suport my claim above, namely that `wnd' is not selected at
that time.
> Still, it's not a perfect solution, since even after setting
> `window-point', (window-start wnd) and (window-end wnd t) will not
> return the correct thing.
What is the wrong thing and what would the correct thing be? The only
function that should work "correctly" here is `set-window-start'.
> I'm pretty sure it's a bug and the code above should work as is, but I'd
> also appreciate pointers for achieving the scrolling and window bounds
> re-calculation for the current Emacs.
Beyond what you can read in the documentations, explaining `recenter' is
hardly possible without explaining redisplay as well. You have to look
at its implementation.
martin