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Re: Save on losing focus in Emacs

From: Tassilo Horn
Subject: Re: Save on losing focus in Emacs
Date: Mon, 02 Jul 2007 11:41:50 +0200
User-agent: Gnus/5.110007 (No Gnus v0.7) Emacs/22.1.50 (gnu/linux)

Tim X <address@hidden> writes:

Hi Tim,

> However, two functions which may be useful are visible-frame-list and
> filtered-frame-list. To make use of these, I think you would dneed to
> use run-with -idle-timer. Yo could possibly define a function that
> looks to see if visible-frame-list returns anything. If it doesn't,
> then save any buffers with unsaved changes.

One problem might be that the timer has to run very often to save
immediately after losing focus.

> The problem with this is that if you have a big enough display, you
> may have both your emacs frame and some other application both
> 'visible', but focus is in the other application. In which case, this
> wouldn't work.

Hm, I use a tiling window manager, so most of the time all frames are
visible unless they're on another workspace.

> Alternatively, you might be able to use mouse-position to determine
> when the mouse is not in an emacs frame - the docs don't seem very
> clear on this and you may need to experiment to see what this function
> actually returns if it is called when the mouse focus is on another
> app. Its likely emacs will report the last frame the mouse was focused
> on.

I don't use a mouse frequently. Most of the time the pointer is in a
corner of the screen.

> P.S. I do find the OPs example a bit odd. I've used Emacs to develop with for
> years and often need to switch to a browser or some other app and I've never
> ever lost any work.

You got him wrong. Let's assume you edit a html-page in emacs and switch
to the browser to view you changes. But, damn, you forgot to save the
buffer, so you have to switch back to emacs, `C-x C-s' and switch back
to the browser and refresh again. If it had saved your changes
automatically when losing focus, that would not be needed.

Chuck Norris sleeps with a pillow under his gun. 

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