working special connect for fftsink

diff --git a/gr-wxgui/src/python/common.py b/gr-wxgui/src/python/common.py
index 09ce4471944d1d04b80aa4904618ee994376e473..fe080aa4ad08470ff164afe4f841e32df3abc0de 100644 (file)
--- a/gr-wxgui/src/python/common.py
+++ b/gr-wxgui/src/python/common.py
@@ -39,12 +39,7 @@ def bind_to_visible_event(win, callback):
                        my_win = parent
        #call the callback, the arg is shown or not
        def callback_factory(my_win, my_callback):
-               cache = [None]
-               def the_callback(*args):
-                       visible = is_wx_window_visible(my_win)
-                       if cache[0] != visible: my_callback(visible)
-                       cache[0] = visible
-               return the_callback
+               return lambda *args: my_callback(is_wx_window_visible(my_win))
        handler = callback_factory(win, callback)
        #bind the handler to all the parent notebooks
        while win:
@@ -57,19 +52,25 @@ def bind_to_visible_event(win, callback):
 from gnuradio import gr
 
 def special_connect(source, sink, hb, win, size):
-       nulls = [gr.null_sink(size), gr.null_source(size)]
+       nulls = list()
+       cache = [None]
        def callback(visible, init=False):
+               if visible == cache[0]: return
+               cache[0] = visible
                if not init: hb.lock()
+               print 'visible', visible
                if visible:
-                       if not init: hb.disconnect(source, nulls[0])
-                       if not init: hb.disconnect(nulls[1], sink)
+                       if not init:
+                               hb.disconnect(source, nulls[0])
+                               hb.disconnect(nulls[1], nulls[2])
+                               hb.disconnect(nulls[2], sink)
+                               while nulls: nulls.pop()
                        hb.connect(source, sink)
-                       #hb.connect(nulls[1], nulls[0])
                else:
                        if not init: hb.disconnect(source, sink)
-                       #if not init: hb.disconnect(nulls[1], nulls[0])
+                       nulls.extend([gr.null_sink(size), gr.null_source(size), gr.head(size, 0)])
                        hb.connect(source, nulls[0])
-                       hb.connect(nulls[1], sink)
+                       hb.connect(nulls[1], nulls[2], sink)
                if not init: hb.unlock()
        callback(False, init=True) #initially connect
        bind_to_visible_event(win, callback)