Customizing quit event behaviour

[gacela.git] / examples / 02-event-driven-programming / 02-event-driven-programming.scm

diff --git a/examples/02-event-driven-programming/02-event-driven-programming.scm b/examples/02-event-driven-programming/02-event-driven-programming.scm
index 505f4b052a2b59f32e8278a1696a2608eb106def..b15123368cbafcdf90ae2a4f47761976a673db88 100644 (file)
--- a/examples/02-event-driven-programming/02-event-driven-programming.scm
+++ b/examples/02-event-driven-programming/02-event-driven-programming.scm
@@ -19,7 +19,16 @@
 
 (use-modules (gacela))
 
+(define counter-quit #f)
+(let ((n 0))
+  (set! counter-quit
+    (lambda ()
+      (set! n (+ n 1))
+      (format #t "Quit clicked ~a times !!~%" n)
+      (if (> n 2)
+         (stop-game)))))
+
 (display-scene
  (window ((resolution '(640 480))
-         (when-quit (lambda () (format #t "Quit clicked!!~%"))))
+         (when-quit counter-quit))
    (bitmap "x.bmp")))