(or device (setq device (selected-device)))
(console-on-window-system-p (device-console device)))
+(defun call-device-method (name device &rest args)
+ "Call a DEVICE-specific function with the generic name NAME.
+If DEVICE is not provide the selected device is used."
+ (or device (setq device (selected-device)))
+ (or (symbolp name) (error "function name must be a symbol"))
+ (let ((devmeth (intern (concat (symbol-name
+ (device-type device)) "-" (symbol-name name)))))
+ (if (functionp devmeth)
+ (if args
+ (apply devmeth args)
+ (funcall devmeth))
+ nil)))
+
+(defmacro define-device-method (name &optional docstring)
+ "Define NAME to be a device method."
+ `(defun ,name (&rest arglist) ,docstring
+ (apply 'call-device-method (quote ,name) nil arglist)))
+
+(defmacro define-device-method* (name &optional docstring)
+ "Define NAME to be a device method."
+ `(defun* ,name (&rest arglist) ,docstring
+ (apply 'call-device-method (quote ,name) nil arglist)))
+
(defalias 'valid-device-type-p 'valid-console-type-p)
(defalias 'device-type-list 'console-type-list)
(defalias 'device-pixel-depth 'device-bitplanes)