91 lines
3.3 KiB
EmacsLisp
91 lines
3.3 KiB
EmacsLisp
;;; dynamic-setting.el --- Support dynamic changes -*- lexical-binding: t -*-
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;; Copyright (C) 2009-2024 Free Software Foundation, Inc.
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;; Author: Jan Djärv <jan.h.d@swipnet.se>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: font, system-font, tool-bar-style
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides the Lisp part of the GConf and XSetting code in
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;; xsetting.c. But there is nothing that prevents it from being used by
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;; other configuration schemes.
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;;; Code:
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;;; Customizable variables
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(declare-function font-get-system-font "xsettings.c" ())
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(declare-function reconsider-frame-font "frame.c" ())
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(defvar font-use-system-font)
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(defun font-setting-change-default-font (display-or-frame set-font)
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"Change font and/or font settings for frames on display DISPLAY-OR-FRAME.
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If DISPLAY-OR-FRAME is a frame, the display is the one for that frame.
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If SET-FONT is non-nil, change the font for frames. Otherwise re-apply
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the current form for the frame (i.e. hinting or somesuch changed)."
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(let ((new-font (and (fboundp 'font-get-system-font)
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(font-get-system-font)))
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(frame-list (frames-on-display-list display-or-frame)))
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(when (and new-font (display-graphic-p display-or-frame))
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(clear-font-cache)
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(if set-font
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;; Set the font on all current and future frames, as though
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;; the `default' face had been "set for this session":
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(set-frame-font new-font nil frame-list)
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;; Just reconsider the existing fonts on all frames on each
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;; display, by clearing the font and face caches. This will
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;; cause all fonts to be recreated.
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(dolist (frame frame-list)
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(reconsider-frame-fonts frame))))))
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(defun dynamic-setting-handle-config-changed-event (event)
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"Handle config-changed-event on the display in EVENT.
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Changes can be
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The monospace font. If `font-use-system-font' is nil,
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the font is not changed.
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The normal font.
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Xft parameters, like DPI and hinting.
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The Gtk+ theme name.
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The tool bar style."
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(interactive "e")
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(let ((type (nth 1 event))
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(display-name (nth 2 event)))
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(cond ((and (eq type 'monospace-font-name) font-use-system-font)
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(font-setting-change-default-font display-name t))
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((eq type 'font-render)
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(font-setting-change-default-font display-name nil))
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;; This is a bit heavy, ideally we would just clear faces
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;; on the affected display, and perhaps only the relevant
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;; faces. Oh well.
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((eq type 'theme-name) (clear-face-cache))
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((eq type 'tool-bar-style) (force-mode-line-update t)))))
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(define-key special-event-map [config-changed-event]
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#'dynamic-setting-handle-config-changed-event)
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(provide 'dynamic-setting)
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;;; dynamic-setting.el ends here
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