split on-event

diff --git a/examples/05-user-interface.scm b/examples/05-user-interface.scm
index e723f9486c24b7b50fbb3f5631301755d1b408b8..83740778e23d14859655b76c64d265dee99fb9d4 100644 (file)
--- a/examples/05-user-interface.scm
+++ b/examples/05-user-interface.scm
@@ -134,45 +134,52 @@
                               #:word-wrap #f
                               #:parent window)))))
 
+(define (on-scrollbar-event id caller)
+  (if (= id GUI-ID-TRANSPARENCY-SCROLLBAR)
+      (let ((pos (get-position caller)))
+        (set-skin-transparency pos (get-skin gui-env))))
+  #f)
+
+(define (on-button-event id)
+  (cond ((= id GUI-ID-QUIT-BUTTON)
+         ;; quit
+         (close-device device)
+         #t)
+
+        ((= id GUI-ID-NEW-WINDOW-BUTTON)
+         ;; new-window
+         (open-new-window)
+         #t)
+
+        ((= id GUI-ID-FILE-OPEN-BUTTON)
+         ;; open file
+         (add-item! listbox "File open")
+         (add-file-open-dialog! gui-env
+                                #:title "Please choose a file"
+                                #:restore-cwd #t)
+         #t)
+
+        (else #f)))
+
+(define (on-file-selected-event caller)
+  (add-item! listbox (get-file-name caller))
+  #f)
+
+(define (on-gui-event event)
+  (let* ((caller (get-event-gui-caller event))
+         (id (get-id caller))
+         (event-type (get-event-gui-type event)))
+    (cond ((equal? event-type 'scrollbar-changed)
+           (on-scrollbar-event id caller))
+          ((equal? event-type 'button-clicked)
+           (on-button-event id))
+          ((equal? event-type 'file-selected)
+           (on-file-selected-event caller))
+          (else #f))))
+
 (define (on-event event)
   (if (equal? (get-event-type event) 'gui-event)
-      (let* ((caller (get-event-gui-caller event))
-             (id (get-id caller))
-             (event-type (get-event-gui-type event)))
-
-        (cond ((equal? event-type 'scrollbar-changed)
-               (if (= id GUI-ID-TRANSPARENCY-SCROLLBAR)
-                   (let ((pos (get-position caller)))
-                     (set-skin-transparency pos (get-skin gui-env))))
-               #f)
-
-              ((equal? event-type 'button-clicked)
-               (cond ((= id GUI-ID-QUIT-BUTTON)
-                      ;; quit
-                      (close-device device)
-                      #t)
-
-                     ((= id GUI-ID-NEW-WINDOW-BUTTON)
-                      ;; new-window
-                      (open-new-window)
-                      #t)
-
-                     ((= id GUI-ID-FILE-OPEN-BUTTON)
-                      ;; open file
-                      (add-item! listbox "File open")
-                      (add-file-open-dialog! gui-env
-                                             #:title "Please choose a file"
-                                             #:restore-cwd #t)
-                      #t)
-
-                     (else #f)))
-
-              ((equal? event-type 'file-selected)
-               (add-item! listbox (get-file-name caller))
-               #f)
-
-              (else #f)))
-
+      (on-gui-event event)
       #f))
 
 (set-event-receiver! device (make-event-receiver on-event))