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viewers.py
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viewers.py
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from enthought.traits.api import Str, Bool, Range, HasTraits, Instance, on_trait_change, List
from enthought.traits.ui.api import Item, View
import threading as t
import time
from variables import Variables
class Viewer(HasTraits):
name = Str('Viewer')
refresh_rate = Range(0.5, 30, 10)
variables = Instance(Variables)
view = View(
Item(label='Viewer')
)
traits_view = View(
Item(name = 'name'),
Item(name = 'refresh_rate'),
title = 'Viewer'
)
def start(self):
pass
def stop(self):
pass
def show(self):
pass
def hide(self):
pass
def update(self):
pass
class Viewers(HasTraits, t.Thread):
viewers = List(Viewer)
variables = Instance(Variables) # Variables instance to provide the data context for all of our viewers
selected_viewer = Instance(Viewer)
name = Str('Viewers') # for thread debugging
_wants_to_terminate = Bool(False)
def __init__(self, **kwargs):
t.Thread.__init__(self)
HasTraits.__init__(self, **kwargs)
@on_trait_change('variables.add_var_event')
def add_expr_to_viewer(self, evt):
if self.selected_viewer:
self.selected_viewer.add_expr(evt.item[0])
def run(self):
""" Thread to update viewers. """
while not self._wants_to_terminate:
if self.selected_viewer:
self.selected_viewer.update()
time.sleep(1.0/self.selected_viewer.refresh_rate)
else:
time.sleep(0.5)
self._stopped()
def select_viewer(self, viewer):
if self.selected_viewer:
self.selected_viewer.hide()
self.selected_viewer = viewer
viewer.show()
def stop(self):
self._wants_to_terminate = True
def _stopped(self):
"""
Called after thread finally stops, use internally
for final clean-up.
"""
map(lambda v: v.stop(), self.viewers)
def _add_viewer(self, viewer):
viewer.variables = self.variables
self.viewers += [viewer]
viewer.start()
def _remove_viewer(self, viewer):
viewer.stop()
self.viewers.remove(viewer)