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cocoa emacs の透明度を変更する elisp

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M-x set-alpha で mini buffer に透明度を入力すると(80とか90とか)変更できるよ。

emacs.el
(defun set-alpha (alpha-num)
  "set frame parameter 'alpha"
  (interactive "nAlpha: ")
  (set-frame-parameter nil 'alpha (cons alpha-num '(90))))
marcy_o
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