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100 lines
3.5 KiB
EmacsLisp
100 lines
3.5 KiB
EmacsLisp
;;; font-setting.el --- Support dynamic font changes
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;; Copyright (C) 2009 Free Software Foundation, Inc.
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;; Author: Jan Djärv <jan.h.d@swipnet.se>
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;; Maintainer: FSF
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;; Keywords: font, system-font
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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 <http://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 it 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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(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 the
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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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(when new-font
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;; Be careful here: when set-face-attribute is called for the
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;; :font attribute, Emacs tries to guess the best matching font
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;; by examining the other face attributes (Bug#2476).
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(clear-font-cache)
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;; Set for current frames. Only change font for those that have
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;; the old font now. If they don't have the old font, the user
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;; probably changed it.
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(dolist (f (frames-on-display-list display-or-frame))
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(if (display-graphic-p f)
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(let* ((frame-font
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(or (font-get (face-attribute 'default :font f
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'default) :name)
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(frame-parameter f 'font-parameter)))
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(font-to-set
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(if set-font new-font
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;; else set font again, hinting etc. may have changed.
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frame-font)))
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(if font-to-set
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(progn
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(message "setting %s" font-to-set)
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(set-frame-parameter f 'font-parameter font-to-set)
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(set-face-attribute 'default f
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:width 'normal
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:weight 'normal
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:slant 'normal
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:font font-to-set))))))
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;; Set for future frames.
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(set-face-attribute 'default t :font new-font)
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(let ((spec (list (list t (face-attr-construct 'default)))))
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(progn
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(put 'default 'customized-face spec)
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(custom-push-theme 'theme-face 'default 'user 'set spec)
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(put 'default 'face-modified nil))))))
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(defun font-setting-handle-config-changed-event (event)
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"Handle config-changed-event to change fonts on the display in EVENT.
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If `font-use-system-font' is nil, the font is not changed."
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(interactive "e")
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(let ((type (nth 1 event)) ;; font-name or font-render
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(display-name (nth 2 event)))
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(if (or (not (eq type 'font-name))
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font-use-system-font)
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(font-setting-change-default-font display-name
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(eq type 'font-name)))))
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(if (or (featurep 'system-font-setting) (featurep 'font-render-setting))
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(define-key special-event-map [config-changed-event]
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'font-setting-handle-config-changed-event))
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(provide 'font-setting)
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