--- /dev/null
+;;; dynamic-setting.el --- Support dynamic changes
+
+;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+
+;; Author: Jan Djärv <jan.h.d@swipnet.se>
+;; Maintainer: FSF
+;; Keywords: font, system-font, tool-bar-style
+
+;; 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 <http://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))))
+ (when new-font
+ ;; Be careful here: when set-face-attribute is called for the
+ ;; :font attribute, Emacs tries to guess the best matching font
+ ;; by examining the other face attributes (Bug#2476).
+
+ (clear-font-cache)
+ ;; Set for current frames. Only change font for those that have
+ ;; the old font now. If they don't have the old font, the user
+ ;; probably changed it.
+ (dolist (f (frames-on-display-list display-or-frame))
+ (if (display-graphic-p f)
+ (let* ((frame-font
+ (or (font-get (face-attribute 'default :font f
+ 'default) :user-spec)
+ (frame-parameter f 'font-parameter)))
+ (font-to-set
+ (if set-font new-font
+ ;; else set font again, hinting etc. may have changed.
+ frame-font)))
+ (if font-to-set
+ (progn
+ (message "setting %s" font-to-set)
+ (set-frame-parameter f 'font-parameter font-to-set)
+ (set-face-attribute 'default f
+ :width 'normal
+ :weight 'normal
+ :slant 'normal
+ :font font-to-set))))))
+
+ ;; Set for future frames.
+ (set-face-attribute 'default t :font new-font)
+ (let ((spec (list (list t (face-attr-construct 'default)))))
+ (progn
+ (put 'default 'customized-face spec)
+ (custom-push-theme 'theme-face 'default 'user 'set spec)
+ (put 'default 'face-modified nil))))))
+
+(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.
+ Xft parameters, like DPI and hinting.
+ 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))
+
+ ((eq type 'tool-bar-style) (force-mode-line-update t)))))
+
+(define-key special-event-map [config-changed-event]
+ 'dynamic-setting-handle-config-changed-event)
+
+;; arch-tag: 3a57e78f-1cd6-48b6-ab75-98f160dcc017