def log_ipywidget(self, toolbar=False, height=200):
l = LogView(layout=Layout(height='%ipx' % height, overflow_y='auto'),
value=self._log_txt())
l.source = self
self._log_ipywidgets.append(l)
if not toolbar:
return l
t = LogToolBar(l)
layout = VBox([t, l])
layout.log_view = l
layout.toolbar = t
return layout
