| 1 | ;;; dynamic-setting.el --- Support dynamic changes |
| 2 | |
| 3 | ;; Copyright (C) 2009-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Jan Djärv <jan.h.d@swipnet.se> |
| 6 | ;; Maintainer: emacs-devel@gnu.org |
| 7 | ;; Keywords: font, system-font, tool-bar-style |
| 8 | ;; Package: emacs |
| 9 | |
| 10 | ;; This file is part of GNU Emacs. |
| 11 | |
| 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
| 13 | ;; it under the terms of the GNU General Public License as published by |
| 14 | ;; the Free Software Foundation, either version 3 of the License, or |
| 15 | ;; (at your option) any later version. |
| 16 | |
| 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;; GNU General Public License for more details. |
| 21 | |
| 22 | ;; You should have received a copy of the GNU General Public License |
| 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | ;;; Commentary: |
| 26 | |
| 27 | ;; This file provides the lisp part of the GConf and XSetting code in |
| 28 | ;; xsetting.c. But it is nothing that prevents it from being used by |
| 29 | ;; other configuration schemes. |
| 30 | |
| 31 | ;;; Code: |
| 32 | |
| 33 | ;;; Customizable variables |
| 34 | |
| 35 | (declare-function font-get-system-font "xsettings.c" ()) |
| 36 | |
| 37 | (defvar font-use-system-font) |
| 38 | |
| 39 | (defun font-setting-change-default-font (display-or-frame set-font) |
| 40 | "Change font and/or font settings for frames on display DISPLAY-OR-FRAME. |
| 41 | If DISPLAY-OR-FRAME is a frame, the display is the one for that frame. |
| 42 | |
| 43 | If SET-FONT is non-nil, change the font for frames. Otherwise re-apply the |
| 44 | current form for the frame (i.e. hinting or somesuch changed)." |
| 45 | (let ((new-font (and (fboundp 'font-get-system-font) |
| 46 | (font-get-system-font))) |
| 47 | (frame-list (frames-on-display-list display-or-frame))) |
| 48 | (when (and new-font (display-graphic-p display-or-frame)) |
| 49 | (clear-font-cache) |
| 50 | (if set-font |
| 51 | ;; Set the font on all current and future frames, as though |
| 52 | ;; the `default' face had been "set for this session": |
| 53 | (set-frame-font new-font nil frame-list) |
| 54 | ;; Just redraw the existing fonts on all frames: |
| 55 | (dolist (f frame-list) |
| 56 | (let ((frame-font |
| 57 | (or (font-get (face-attribute 'default :font f 'default) |
| 58 | :user-spec) |
| 59 | (frame-parameter f 'font-parameter)))) |
| 60 | (when frame-font |
| 61 | (set-frame-parameter f 'font-parameter frame-font) |
| 62 | (set-face-attribute 'default f |
| 63 | :width 'normal |
| 64 | :weight 'normal |
| 65 | :slant 'normal |
| 66 | :font frame-font)))))))) |
| 67 | |
| 68 | (defun dynamic-setting-handle-config-changed-event (event) |
| 69 | "Handle config-changed-event on the display in EVENT. |
| 70 | Changes can be |
| 71 | The monospace font. If `font-use-system-font' is nil, the font |
| 72 | is not changed. |
| 73 | The normal font. |
| 74 | Xft parameters, like DPI and hinting. |
| 75 | The Gtk+ theme name. |
| 76 | The tool bar style." |
| 77 | (interactive "e") |
| 78 | (let ((type (nth 1 event)) |
| 79 | (display-name (nth 2 event))) |
| 80 | (cond ((and (eq type 'monospace-font-name) font-use-system-font) |
| 81 | (font-setting-change-default-font display-name t)) |
| 82 | |
| 83 | ((eq type 'font-render) |
| 84 | (font-setting-change-default-font display-name nil)) |
| 85 | |
| 86 | ;; This is a bit heavy, ideally we would just clear faces |
| 87 | ;; on the affected display, and perhaps only the relevant |
| 88 | ;; faces. Oh well. |
| 89 | ((eq type 'theme-name) (clear-face-cache)) |
| 90 | |
| 91 | ((eq type 'tool-bar-style) (force-mode-line-update t))))) |
| 92 | |
| 93 | (define-key special-event-map [config-changed-event] |
| 94 | 'dynamic-setting-handle-config-changed-event) |
| 95 | |