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From: "rgb" <rbielaws@i1.net>
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Subject: Re: Toggle fullscreen with one key
Date: 18 Mar 2005 16:30:32 -0800
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This seems to work pretty well for me.
If you use the restore/maximize buttons or double click the
title bar (etc) my-frame-state could get out of sync but it
re-syncs every time my-frame-maximize or my-frame-restore
are called.

(make-variable-frame-local 'my-frame-state)
>
> (defun my-frame-maximize () "Maximize Emacs window in win32"
> (interactive)
  (modify-frame-parameters nil '((my-frame-state . t)))
> (w32-send-sys-command ?\xf030))
>
> (defun my-frame-restore () "Restore Emacs window in win32"
> (interactive)
  (modify-frame-parameters nil '((my-frame-state . nil)))
> (w32-send-sys-command ?\xF120))
>
(defun my-frame-toggle ()
  "Maximize/Restore Emacs frame based on `my-frame-state'"
  (interactive)
  (if my-frame-state
       (my-frame-restore)
     (my-frame-maximize)))
> --- keys
> 
(global-set-key [f2] 'my-frame-toggle) 
>