From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Detect window switches? Date: Thu, 26 Sep 2013 16:27:04 -0400 Message-ID: References: <83mwmzfjoc.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1380227267 29155 80.91.229.3 (26 Sep 2013 20:27:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 26 Sep 2013 20:27:47 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Sep 26 22:27:50 2013 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VPIA7-0002dd-VD for geh-help-gnu-emacs@m.gmane.org; Thu, 26 Sep 2013 22:27:48 +0200 Original-Received: from localhost ([::1]:59805 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPIA7-0002b2-IZ for geh-help-gnu-emacs@m.gmane.org; Thu, 26 Sep 2013 16:27:47 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48480) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPI9p-0002af-JN for help-gnu-emacs@gnu.org; Thu, 26 Sep 2013 16:27:37 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VPI9h-0006ot-KL for help-gnu-emacs@gnu.org; Thu, 26 Sep 2013 16:27:29 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:41580) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPI9h-0006on-De for help-gnu-emacs@gnu.org; Thu, 26 Sep 2013 16:27:21 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1VPI9f-00028n-5x for help-gnu-emacs@gnu.org; Thu, 26 Sep 2013 22:27:19 +0200 Original-Received: from 184.175.15.200 ([184.175.15.200]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 26 Sep 2013 22:27:19 +0200 Original-Received: from monnier by 184.175.15.200 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 26 Sep 2013 22:27:19 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 17 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 184.175.15.200 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) Cancel-Lock: sha1:2OHkvtSYo8fNW/WDmepHXoCS6zw= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:93640 Archived-At: >> Hmm, starting to sound like a bug. Here's an event that Emacs acts >> on but doesn't make the event visible to ELisp. > No, Emacs doesn't act on this as an event. What happens is that the > next redisplay after a window switch redraws the mode line in a > different face. The redisplay isn't triggered by an event (because > there is no such event), it is triggered by other means, mostly > because Emacs becomes idle. That could happen many seconds after the > switch, if Emacs becomes busy calculating something, for example. Well the event is `redisplay', and indeed if we had a before-redisplay-hook, we could use it to do that in Lisp (although we'd bump into another problem: faces can't be set per-window. Tho maybe with a redisplay-window-hook we could trick the display into using different face settings for different windows). Stefan