widget-tree sync eventloop - 2

scsh/scgame/scgamewidgets.scm

@@ -1,4 +1,5 @@
-;;; scgamewidgets.scm - a scheme game library (needs scx-0.2 or scheme48-fb)
+;;; scgamewidgets.scm - a scheme game library widgets
+;;  (needs scx-0.2 or scheme48-fb)
 ;;;
 ;;; Copyright (c) 2011-2012 Johan Ceuppens
 ;;;
@@ -85,6 +86,21 @@
              #t))
       #f))
 
+(define (draw-widget-tree widget-tree)
+  (define (frec l)
+    (cond ((null? l) #f)
+          ((list? (car l))
+           (frec (car l)))
+          ((widget? (car l))
+           (((car l) 'draw)))
+          (else (frec (cdr l)))))
+
+  (if (widget-node? node)
+      (for-each frec (force node))
+      #f))
+
+
+
 ;; widgets
 
 (define (make-scgame-widget)
@@ -210,18 +226,20 @@
 ;; This is the main loop you call on your window's
 ;; widget tree (see above)
 
-(define (widget-tree-eventloop dpy win widget-tree)
-  (let ((mousex 0)
-        (mousey 0))
+(define (widget-tree-eventloop dpy win tree)
+  (let ((mousex 0))
+    (let ((mousey 0))
+      (let ((widget-tree tree))
         (init-sync-x-events dpy)
         (map-window dpy win)
         (call-with-event-channel
          dpy win (event-mask button-press)
          (lambda (channel)
-       ;; FIXME calibrate at 10 times or using nanosleep
+           ;; FIXME calibrate at 10 times or using nanosleep for your machine
            (let loop ()
              (if
               (let ((e (receive channel)))
+                ;; process events
                 (cond
                  ((motion-event? e)
                   (set! mousex motion-event-x)
@@ -240,6 +258,9 @@
                   (expose-window dpy expose-event-window))
                  ((destroy-widow-event? e)
                   (expose-window dpy destroy-window-event-window))
-             (else #f))))
-         (loop))))))
+                 (else #f))
+                ;; draw widgets in tree
+                (draw-widget-tree widget-tree)
+                ))
+             (loop))))))))