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e0620570 | 1 | ;;; font-setting.el --- Support dynamic font changes |
637fa988 | 2 | |
114f9c96 | 3 | ;; Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
637fa988 JD |
4 | |
5 | ;; Author: Jan Djärv <jan.h.d@swipnet.se> | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: font, system-font | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software: you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation, either version 3 of the License, or | |
14 | ;; (at your option) any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; This file provides the lisp part of the GConf and XSetting code in | |
27 | ;; xsetting.c. But it is nothing that prevents it from being used by | |
28 | ;; other configuration schemes. | |
29 | ||
30 | ;;; Code: | |
31 | ||
32 | ;;; Customizable variables | |
33 | ||
637fa988 JD |
34 | (declare-function font-get-system-font "xsettings.c" ()) |
35 | ||
e0620570 JB |
36 | (defvar font-use-system-font) |
37 | ||
637fa988 JD |
38 | (defun font-setting-change-default-font (display-or-frame set-font) |
39 | "Change font and/or font settings for frames on display DISPLAY-OR-FRAME. | |
40 | If DISPLAY-OR-FRAME is a frame, the display is the one for that frame. | |
41 | ||
e0620570 | 42 | If SET-FONT is non-nil, change the font for frames. Otherwise re-apply the |
637fa988 JD |
43 | current form for the frame (i.e. hinting or somesuch changed)." |
44 | ||
e0620570 | 45 | (let ((new-font (and (fboundp 'font-get-system-font) |
637fa988 JD |
46 | (font-get-system-font)))) |
47 | (when new-font | |
48 | ;; Be careful here: when set-face-attribute is called for the | |
49 | ;; :font attribute, Emacs tries to guess the best matching font | |
50 | ;; by examining the other face attributes (Bug#2476). | |
51 | ||
52 | (clear-font-cache) | |
53 | ;; Set for current frames. Only change font for those that have | |
54 | ;; the old font now. If they don't have the old font, the user | |
55 | ;; probably changed it. | |
56 | (dolist (f (frames-on-display-list display-or-frame)) | |
57 | (if (display-graphic-p f) | |
e0620570 | 58 | (let* ((frame-font |
637fa988 | 59 | (or (font-get (face-attribute 'default :font f |
42707278 | 60 | 'default) :user-spec) |
637fa988 JD |
61 | (frame-parameter f 'font-parameter))) |
62 | (font-to-set | |
63 | (if set-font new-font | |
64 | ;; else set font again, hinting etc. may have changed. | |
65 | frame-font))) | |
dfb3c4c6 JD |
66 | (if font-to-set |
67 | (progn | |
68 | (message "setting %s" font-to-set) | |
69 | (set-frame-parameter f 'font-parameter font-to-set) | |
e0620570 | 70 | (set-face-attribute 'default f |
dfb3c4c6 JD |
71 | :width 'normal |
72 | :weight 'normal | |
73 | :slant 'normal | |
74 | :font font-to-set)))))) | |
e0620570 | 75 | |
637fa988 JD |
76 | ;; Set for future frames. |
77 | (set-face-attribute 'default t :font new-font) | |
78 | (let ((spec (list (list t (face-attr-construct 'default))))) | |
79 | (progn | |
80 | (put 'default 'customized-face spec) | |
81 | (custom-push-theme 'theme-face 'default 'user 'set spec) | |
82 | (put 'default 'face-modified nil)))))) | |
83 | ||
84 | (defun font-setting-handle-config-changed-event (event) | |
85 | "Handle config-changed-event to change fonts on the display in EVENT. | |
86 | If `font-use-system-font' is nil, the font is not changed." | |
87 | (interactive "e") | |
88 | (let ((type (nth 1 event)) ;; font-name or font-render | |
89 | (display-name (nth 2 event))) | |
90 | (if (or (not (eq type 'font-name)) | |
91 | font-use-system-font) | |
92 | (font-setting-change-default-font display-name | |
93 | (eq type 'font-name))))) | |
94 | ||
95 | (if (or (featurep 'system-font-setting) (featurep 'font-render-setting)) | |
e0620570 | 96 | (define-key special-event-map [config-changed-event] |
637fa988 JD |
97 | 'font-setting-handle-config-changed-event)) |
98 | ||
99 | (provide 'font-setting) | |
964f5b2b MB |
100 | |
101 | ;; arch-tag: 3a57e78f-1cd6-48b6-ab75-98f160dcc017 |