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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Alan Mackenzie <acm@muc.de>
Cc: emacs-devel@gnu.org
Subject: Re: What are invisible frames for?
Date: Thu, 22 Apr 2021 08:31:35 -0400	[thread overview]
Message-ID: <jwva6pqjyjb.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <YIFLRsawLKHiXqGg@ACM> (Alan Mackenzie's message of "Thu, 22 Apr 2021 10:09:10 +0000")

> In src/frame.c, the notion of an @dfn{invisible frame} is implemented.
> On a GUI, when a frame is in this invisible state, it appears to be
> completely inaccessible to the user - it doesn't appear anywhere on the
> GUI, there appear to be no commands to access it, and so on.  Only a
> Lisp form can do anything with it, like making it visible again.
>
> What is this facility used for?

I don't know what was it's original intention, but I know it's used in
`server-select-display` (via the frame property `visibility`) to create
a dummy frame that lets us "select a display" without having to select
any of its "real" frames (because it doesn't have any yet).

I have the impression that I've used it elsewhere in a similar "hackish"
way but can neither remember where nor why.  And maybe I'm just misremembering.


        Stefan




  parent reply	other threads:[~2021-04-22 12:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 10:09 What are invisible frames for? Alan Mackenzie
2021-04-22 12:15 ` martin rudalics
2021-04-22 13:18   ` Stefan Monnier
2021-04-22 21:23     ` Clément Pit-Claudel
2021-04-22 14:13   ` Alan Mackenzie
2021-04-22 16:09     ` [External] : " Drew Adams
2021-04-22 12:31 ` Stefan Monnier [this message]
2021-04-22 13:54   ` Michael Welsh Duggan
2021-04-22 14:08     ` Stefan Monnier
2021-04-22 14:13     ` Eli Zaretskii
2021-04-22 14:14 ` tumashu

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