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bug#25408: Remove Decorations Around Emacs Frame (Windows OS)

From: Alan Third
Subject: bug#25408: Remove Decorations Around Emacs Frame (Windows OS)
Date: Thu, 13 Apr 2017 11:30:26 +0100
User-agent: Mutt/1.7.2 (2016-11-26)

On Thu, Apr 13, 2017 at 09:10:26AM +0200, martin rudalics wrote:
> >> When can you remove the decorations?  Does it flicker when you do that?
> >
> > I mean, it *can* resize after I remove the decorations.
> I wanted to know "when" in the sense of "what do you have to wait for"
> to remove the decorations?  Can you send two requests in a row - a first
> one to create a decorated frame and a second one to remove the
> decorations - or do you have to wait for a response for the first
> request before issuing the second one.

I’ve worked it out: the toolbar is considered a ‘decoration’ by Cocoa,
so it is automatically removed when I change a frame to undecorated.
However, when I create a new undecorated frame the frame redrawing
code waits for the toolbar to be drawn, which will never happen.

I think this gives me two options:

  1. Get Emacs to disable the toolbar when switching to undecorated

  2. Use a different method of removing the titlebar when the toolbar
     is enabled than when the toolbar is disabled. This option will
     only work in macOS 10.11 and above.

Option 1 seems preferable to me, although we could add option 2 later.

> Can you look also into three other things I added:
> - Provide a `move-frame-functions' hook.
> - Provide "frame restacking" which should work via orderWindow.  I
>   suppose NS has no equivalent for z-groups.
> - Provide "child frames" which should work via parentWindow.
> I don't know whether NS child windows always behave like NS "drawers" or
> may also occlude the parent frame like under X or Windows.  Eventually
> I'd like to have them both (like Wayland's subsurfaces if I understand
> them correctly).  Drawers look like a pain when you are in fullscreen
> mode - IIUC there's no way to open them "into" a fullscreen frame.
> X/Windows child windows are annoying when you are in a normal, fairly
> small frame where they get clipped too easily.

I don’t know enough about NS to be able to answer this. I’ll give it a
go and see what happens.
Alan Third

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