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;;; dynamic-setting.el --- Support dynamic changes
;; Copyright (C) 2009-2021 Free Software Foundation, Inc.
;; Author: Jan Djärv <jan.h.d@swipnet.se>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: font, system-font, tool-bar-style
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This file provides the lisp part of the GConf and XSetting code in
;; xsetting.c. But it is nothing that prevents it from being used by
;; other configuration schemes.
;;; Code:
;;; Customizable variables
(declare-function font-get-system-font "xsettings.c" ())
(defvar font-use-system-font)
(defun font-setting-change-default-font (display-or-frame set-font)
"Change font and/or font settings for frames on display DISPLAY-OR-FRAME.
If DISPLAY-OR-FRAME is a frame, the display is the one for that frame.
If SET-FONT is non-nil, change the font for frames. Otherwise re-apply
the current form for the frame (i.e. hinting or somesuch changed)."
(let ((new-font (and (fboundp 'font-get-system-font)
(font-get-system-font)))
(frame-list (frames-on-display-list display-or-frame)))
(when (and new-font (display-graphic-p display-or-frame))
(clear-font-cache)
(if set-font
;; Set the font on all current and future frames, as though
;; the `default' face had been "set for this session":
(set-frame-font new-font nil frame-list)
;; Just redraw the existing fonts on all frames:
(dolist (f frame-list)
(let ((frame-font
(or (font-get (face-attribute 'default :font f 'default)
:user-spec)
(frame-parameter f 'font-parameter))))
(when frame-font
(set-frame-parameter f 'font-parameter frame-font)
(set-face-attribute 'default f
:width 'normal
:weight 'normal
:slant 'normal
:font frame-font))))))))
(defun dynamic-setting-handle-config-changed-event (event)
"Handle config-changed-event on the display in EVENT.
Changes can be
The monospace font. If `font-use-system-font' is nil,
the font is not changed.
The normal font.
Xft parameters, like DPI and hinting.
The Gtk+ theme name.
The tool bar style."
(interactive "e")
(let ((type (nth 1 event))
(display-name (nth 2 event)))
(cond ((and (eq type 'monospace-font-name) font-use-system-font)
(font-setting-change-default-font display-name t))
((eq type 'font-render)
(font-setting-change-default-font display-name nil))
;; This is a bit heavy, ideally we would just clear faces
;; on the affected display, and perhaps only the relevant
;; faces. Oh well.
((eq type 'theme-name) (clear-face-cache))
((eq type 'tool-bar-style) (force-mode-line-update t)))))
(define-key special-event-map [config-changed-event]
'dynamic-setting-handle-config-changed-event)
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