GNU bug report logs - #7381
24.0.50; Provide a hook run when a window is selected

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From: Štěpán Němec <stepnem <at> gmail.com>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 7381 <at> debbugs.gnu.org
Subject: bug#7381: 24.0.50; Provide a hook run when a window is selected
Date: Fri, 12 Nov 2010 12:31:52 +0100

martin rudalics <rudalics <at> gmx.at> writes:

>> Use case: I wanted to make myself a command to select the last selected
>> window (i.e., repeating the command would toggle between two windows).
>>
>> After some head-scratching, the best I could come up with is this:
>>
>> (defun .goto-mru-window ()
>>   (interactive)
>>   (select-window (frame-parameter nil '.last-selected-window)))
>>
>> (defadvice select-window (before .save-selected-window activate)
>>   (set-frame-parameter nil '.last-selected-window (selected-window)))
>>
>> ...which seems to work most of the time, but using an advice doesn't
>> feel that great, esp. with C functions.
>
> You might want to have a look at my window-pub branch.  It has
>
> window-use-time is a built-in function in `window.c'.
>
> (window-use-time &optional WINDOW)
>
> Return WINDOW's use time.
> WINDOW defaults to the selected window.  The window with the highest use
> time is the most recently selected one.  The window with the lowest use
> time is the least recently selected one.
>
> and
>
> get-mru-window is a compiled Lisp function in `window.el'.
>
> (get-mru-window &optional ALL-FRAMES)
>
> Return the most recently used window on frames specified by ALL-FRAMES.
> Do not return a minibuffer window.
>
> The following non-nil values of the optional argument ALL-FRAMES
> have special meanings:
>
> - t means consider all windows on all existing frames.
>
> - `visible' means consider all windows on all visible frames.
>
> - 0 (the number zero) means consider all windows on all visible
>     and iconified frames.
>
> - A frame means consider all windows on that frame only.
>
> Any other value of ALL-FRAMES means consider all windows on the
> selected frame and no others.

This is great, thank you! I'll have a look.

Any reason not to have `get-mru-window' in the trunk (I actually
searched for exactly that before resorting to the advice hack)?

(And I guess the hook proposal still stands as well, or are there any
arguments against that? One might want to do other things triggered by
window selection.)

  Štěpán

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