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transparency.el

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+;;; transparency.el --- a viewing mode for books and novels.  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019 Robert Rose
+
+;; Author: Robert Rose <overclucker@gmail.com>
+;; Keywords: lisp eww novel book
+;; Version: 0.0.1
+;; Package-Requires ((emacs "24"))
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Toggles transparency on and off with `transparency-toggle'. Customize how it looks in `transparency'
+;; custom group.
+
+;;; Code:
+
+(defvar transparency-state nil
+  "Reflects the current state of transparency.")
+
+(defvar transparency-original-faces '()
+  "Stores original faces while transparency is enable.")
+
+(defgroup transparency nil
+  "Custom group for transparency package.")
+
+(defcustom transparency-alpha 50
+  "The level of transparency used."
+  :type 'integer
+  :group 'transparency)
+
+(defcustom transparency-faces
+  '((default :background "#444")
+    (default :foreground "grey75")
+    (fringe :background "#444")
+    (mode-line :background "#444")
+    (mode-line :foreground "grey75")
+    (mode-line :box nil)
+    (mode-line-inactive :background "#444")
+    (mode-line-inactive :foreground "grey50")
+    (mode-line-inactive :box nil))
+  "Faces used when transparency is enabled."
+  :type '(alist face)
+  :group 'transparency)
+
+
+(setq alpha-prop (if (>= emacs-major-version 29) 
+                        'alpha-background 
+                      'alpha))
+
+(defun transparency-modface (FPV)
+  "Sets new and returns old FPV"
+  (let* ((face (pop FPV))
+	 (prop (pop FPV))
+	 (val (pop FPV))
+	 (prev (face-attribute face prop)))    
+    (set-face-attribute face nil prop val)
+    `(,face ,prop ,prev)))
+
+(defun transparency-toggle ()
+  "better alpha toggle transparency"
+  (interactive)
+  (if transparency-state
+      (progn
+	(set-frame-parameter nil alpha-prop 100)
+	;; (set-frame-parameter nil 'alpha-background 100)
+	(mapcar 'transparency-modface transparency-original-faces)
+	(setq transparency-state nil))
+    (set-frame-parameter nil alpha-prop transparency-alpha)
+    (setq transparency-original-faces
+	  (mapcar 'transparency-modface transparency-faces))
+    (setq transparency-state t)))
+
+(provide 'transparency)
+
+;;; transparency.el ends here