Emacs: Set background color for specific window

Is it possible to set the background color of a specific emacs window?

I am using the "dedicated window" functionality to pin an emacs buffer to a frame. However, I also want that window to be recognizable as a dedicated window.

Currently I am using buffer-face-mode to set a buffer-specific default font with a slightly darker background color. However, this formatting also applies to windows viewing the same buffer, that are not dedicated to the buffer. Being able to set the font on a per-window basis would remove that problem.

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Doing it for one specific window is not a feature Emacs supports right now. OTOH you can do it for a specific frame, so if your window is inside a frame with a single window (as is often the case for dedicated windows), you can definitely set the background-color frame-paramter (and should be able to set it directly from display-buffer-alist or special-display-regexps .

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What you want is to specify the buffer as being "special-display". That does just what you want.

You can customize one or both of these options (variables):

special-display-regexps

special-display-buffer-names

That's the easy way. Emacs likes to consider these options obsolete since release 24.3, and it recommends that you use the incredibly complicated option display-buffer-alist instead.

This is all I do, to have all buffers with names that start and end with * to be displayed in their own, dedicated frames:

(setq special-display-regexps '("[ ]?[*][^*]+[*]"))

To get special-display frames to have different properties (ie, frame parameters), such as a different color background, customize option special-display-frame-alist .

This is essentially the definition I use:

(setq special-display-alist
      '((font . "-*-Lucida Console-normal-r-*-*-14-*-*-*-c-*-iso8859-1")
        (width . 80)
        (height . 14)
        (mouse-color . "Yellow")
        (cursor-color . "Yellow")
        (menu-bar-lines . 1)
        (foreground-color . "Black")
        (background-color . "LightSteelBlue")
        (top . 0)
        (left . 0)
        (unsplittable . t)
        (user-position . t)
        (vertical-scroll-bars . right)))

But I recommend that you use Customize to set the value of all such options.

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The method that worked for me in Emacs 25.1.1 was using the face-remapping-alist variable. When the buffer is initialized, modify the :background attribute of the default face to the color you want. Eg, I make the background color of my Treemacs buffer different than everything else by adding something like this to my .emacs file:

(defun treemacs-mode-handler()
  (set (make-local-variable 'face-remapping-alist)
       '((default :background "#303030"))))

(add-hook 'treemacs-mode-hook 'treemacs-mode-handler)

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