+
+(defvar mouse-appearance-menu-map nil)
+(declare-function x-select-font "xfns.c" (&optional frame ignored)) ; USE_GTK
+(declare-function buffer-face-mode-invoke "face-remap"
+ (face arg &optional interactive))
+(declare-function font-face-attributes "font.c" (font &optional frame))
+
+(defun mouse-appearance-menu (event)
+ (interactive "@e")
+ (require 'face-remap)
+ (when (display-multi-font-p)
+ (with-selected-window (car (event-start event))
+ (if mouse-appearance-menu-map
+ nil ; regenerate new fonts
+ ;; Initialize mouse-appearance-menu-map
+ (setq mouse-appearance-menu-map
+ (make-sparse-keymap "Change Default Buffer Face"))
+ (define-key mouse-appearance-menu-map [face-remap-reset-base]
+ '(menu-item "Reset to Default" face-remap-reset-base))
+ (define-key mouse-appearance-menu-map [text-scale-decrease]
+ '(menu-item "Decrease Buffer Text Size" text-scale-decrease))
+ (define-key mouse-appearance-menu-map [text-scale-increase]
+ '(menu-item "Increase Buffer Text Size" text-scale-increase))
+ ;; Font selector
+ (if (functionp 'x-select-font)
+ (define-key mouse-appearance-menu-map [x-select-font]
+ '(menu-item "Change Buffer Font..." x-select-font))
+ ;; If the select-font is unavailable, construct a menu.
+ (let ((font-submenu (make-sparse-keymap "Change Text Font"))
+ (font-alist (cdr (append x-fixed-font-alist
+ (list (generate-fontset-menu))))))
+ (dolist (family font-alist)
+ (let* ((submenu-name (car family))
+ (submenu-map (make-sparse-keymap submenu-name)))
+ (dolist (font (cdr family))
+ (let ((font-name (car font))
+ font-symbol)
+ (if (string= font-name "")
+ (define-key submenu-map [space]
+ '("--"))
+ (setq font-symbol (intern (cadr font)))
+ (define-key submenu-map (vector font-symbol)
+ (list 'menu-item (car font) font-symbol)))))
+ (define-key font-submenu (vector (intern submenu-name))
+ (list 'menu-item submenu-name submenu-map))))
+ (define-key mouse-appearance-menu-map [font-submenu]
+ (list 'menu-item "Change Text Font" font-submenu)))))
+ (let ((choice (x-popup-menu event mouse-appearance-menu-map)))
+ (setq choice (nth (1- (length choice)) choice))
+ (cond ((eq choice 'text-scale-increase)
+ (text-scale-increase 1))
+ ((eq choice 'text-scale-decrease)
+ (text-scale-increase -1))
+ ((eq choice 'face-remap-reset-base)
+ (text-scale-mode 0)
+ (buffer-face-mode 0))
+ (choice
+ ;; Either choice == 'x-select-font, or choice is a
+ ;; symbol whose name is a font.
+ (buffer-face-mode-invoke (font-face-attributes
+ (if (eq choice 'x-select-font)
+ (x-select-font)
+ (symbol-name choice)))
+ t (interactive-p))))))))
+