(no commit message)

[gacela.git] / src / gacela_widgets.scm

diff --git a/src/gacela_widgets.scm b/src/gacela_widgets.scm
index 04f2dcb2a3088c7965ed2c8c236e12e02fd0f085..b5ddc478e2563cf940cd98e29ccc519e8b46b1e5 100755 (executable)
--- a/src/gacela_widgets.scm
+++ b/src/gacela_widgets.scm
@@ -18,26 +18,48 @@
 ;;; Timers
 
 (define (make-timer)
-  '((start . 0) (paused . 0) (state . stopped)))
+  (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))))
+
+       ((get-state)
+        state)
+
+       ((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))))))))
 
 (define (start-timer timer)
-  (assoc-set! timer 'start (SDL_GetTicks))
-  (assoc-set! timer state 'running))
+  (timer 'start-timer))
 
 (define (stop-timer timer)
-  (assoc-set! timer 'state 'stopped))
+  (timer 'stop-timer))
 
 (define (get-time timer)
-  (cond ((eq? (assoc 'state timer) 'stopped) 0)
-        ((eq? (assoc 'state timer) 'paused) (assoc 'paused timer))
-        (else (- (SDL_GetTicks) (assoc 'start timer)))))
+  (timer 'get-time))
+
+(define (get-state timer)
+  (timer 'get-state))
 
 (define (pause-timer timer)
-  (cond ((eq? (assoc 'state timer) 'running)
-         (assoc-set! timer 'paused (- (SDL_GetTicks) (assoc 'start timer)))
-         (assoc-set! timer 'state 'paused))))
+  (timer 'pause-timer))
 
 (define (resume-timer timer)
-  (cond ((eq? (assoc 'state timer) 'paused)
-         (assoc-set! timer 'start (- (SDL_GetTicks) (assoc 'paused timer)))
-         (assoc-set! timer 'state 'running))))
+  (timer 'resume-timer))