X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=src%2Fgacela_widgets.scm;h=fedc56338bc3b62e993cba76839896d69b742d31;hb=afd5b9c3d8e3e5ce81893771c7cac53f6469aa07;hp=a0e022357accb8c90aa16d1d62cc3916490790dd;hpb=09fa5781bfe3e7b8406a4cee4eb24923e14527b0;p=gacela.git

diff --git a/src/gacela_widgets.scm b/src/gacela_widgets.scm
index a0e0223..fedc563 100755
--- a/src/gacela_widgets.scm
+++ b/src/gacela_widgets.scm
@@ -17,27 +17,24 @@
 
 ;;; Timers
 
-(defstruct timer (start 0) (paused 0) (state 'stopped))
-
-(defun start-timer (timer)
-  (setf (timer-start timer) (SDL_GetTicks))
-  (setf (timer-state timer) 'running))
-
-(defun stop-timer (timer)
-  (setf (timer-state timer) 'stopped))
-
-(defun get-time (timer)
-  (cond ((eq (timer-state timer) 'stopped) 0)
-        ((eq (timer-state timer) 'paused) (timer-paused timer))
-        (t (- (SDL_GetTicks) (timer-start timer)))))
-
-(defun pause-timer (timer)
-  (cond ((eq (timer-state timer) 'running)
-         (setf (timer-paused timer) (- (SDL_GetTicks) (timer-start timer)))
-         (setf (timer-state timer) 'paused))))
-
-(defun resume-timer (timer)
-  (cond ((eq (timer-state timer) 'paused)
-         (setf (timer-start timer) (- (SDL_GetTicks) (timer-paused timer)))
-         (setf (timer-state timer) 'running))))
-
+(define (make-timer)
+  (let ((start 0) (paused 0) (state 'stopped))
+    (lambda (op)
+      (case op
+	(('start-timer)
+	 (set! start (SDL_GetTicks))
+	 (set! state 'running))
+	(('stop-timer)
+	 (set! state 'stopped))
+	(('get-time)
+	 (cond ((eq? state 'stopped) 0)
+	       ((eq? state 'paused) paused)
+	       (else (- (SDL_GetTicks) start))))
+	(('pause-timer)
+	 (cond ((eq? state 'running)
+		(set! paused (- (SDL_GetTicks) start))
+		(set! state 'paused))))
+	(('resume-timer)
+	 (cond ((eq? state 'paused)
+		(set! start (- (SDL_GetTicks) paused))
+		(set! state 'running))))))))