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;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program 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.
;;;
;;; This program 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 this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; SDL event handlers.
;;
;;; Code:
(define-module (sly event)
#:use-module ((sdl2 events) #:prefix sdl2:)
#:export (process-events
register-event-handler))
(define (process-events)
"Process all events in the input event queue."
(let ((e (sdl2:poll-event)))
(when e
(handle-event e)
(process-events))))
(define event-handlers (make-hash-table))
(define (register-event-handler event-type proc)
(hashq-set! event-handlers event-type proc))
(define (handle-event e)
"Run the relevant hook for the event E."
(define (event-type e)
(cond
((sdl2:keyboard-down-event? e)
'key-down)
((sdl2:keyboard-up-event? e)
'key-up)
((sdl2:mouse-button-down-event? e)
'mouse-button-down)
((sdl2:mouse-button-up-event? e)
'mouse-button-up)
((sdl2:mouse-motion-event? e)
'mouse-motion)
((sdl2:joystick-button-down-event? e)
'joy-button-down)
((sdl2:joystick-button-up-event? e)
'joy-button-up)
((sdl2:joystick-axis-event? e)
'joy-axis-motion)
((sdl2:window-resized-event? e)
'window-resize)
((sdl2:quit-event? e)
'quit)))
(let ((handler (hashq-ref event-handlers (event-type e))))
(and handler (handler e))))
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