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import unittest
import Tkinter as tkinter
from test.test_support import requires, run_unittest
from test_ttk.support import AbstractTkTest
requires('gui')
class MiscTest(AbstractTkTest, unittest.TestCase):
def test_after(self):
root = self.root
cbcount = {'count': 0}
def callback(start=0, step=1):
cbcount['count'] = start + step
# Without function, sleeps for ms.
self.assertIsNone(root.after(1))
# Set up with callback with no args.
cbcount['count'] = 0
timer1 = root.after(0, callback)
self.assertIn(timer1, root.tk.call('after', 'info'))
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', timer1))
root.update() # Process all pending events.
self.assertEqual(cbcount['count'], 1)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
# Set up with callback with args.
cbcount['count'] = 0
timer1 = root.after(0, callback, 42, 11)
root.update() # Process all pending events.
self.assertEqual(cbcount['count'], 53)
# Cancel before called.
timer1 = root.after(1000, callback)
self.assertIn(timer1, root.tk.call('after', 'info'))
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', timer1))
root.after_cancel(timer1) # Cancel this event.
self.assertEqual(cbcount['count'], 53)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
def test_after_idle(self):
root = self.root
cbcount = {'count': 0}
def callback(start=0, step=1):
cbcount['count'] = start + step
# Set up with callback with no args.
cbcount['count'] = 0
idle1 = root.after_idle(callback)
self.assertIn(idle1, root.tk.call('after', 'info'))
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', idle1))
root.update_idletasks() # Process all pending events.
self.assertEqual(cbcount['count'], 1)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
# Set up with callback with args.
cbcount['count'] = 0
idle1 = root.after_idle(callback, 42, 11)
root.update_idletasks() # Process all pending events.
self.assertEqual(cbcount['count'], 53)
# Cancel before called.
idle1 = root.after_idle(callback)
self.assertIn(idle1, root.tk.call('after', 'info'))
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', idle1))
root.after_cancel(idle1) # Cancel this event.
self.assertEqual(cbcount['count'], 53)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
def test_after_cancel(self):
root = self.root
cbcount = {'count': 0}
def callback():
cbcount['count'] += 1
timer1 = root.after(5000, callback)
idle1 = root.after_idle(callback)
# No value for id raises a ValueError.
with self.assertRaises(ValueError):
root.after_cancel(None)
# Cancel timer event.
cbcount['count'] = 0
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', timer1))
root.tk.call(script)
self.assertEqual(cbcount['count'], 1)
root.after_cancel(timer1)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
self.assertEqual(cbcount['count'], 1)
with self.assertRaises(tkinter.TclError):
root.tk.call('after', 'info', timer1)
# Cancel same event - nothing happens.
root.after_cancel(timer1)
# Cancel idle event.
cbcount['count'] = 0
(script, _) = root.tk.splitlist(root.tk.call('after', 'info', idle1))
root.tk.call(script)
self.assertEqual(cbcount['count'], 1)
root.after_cancel(idle1)
with self.assertRaises(tkinter.TclError):
root.tk.call(script)
self.assertEqual(cbcount['count'], 1)
with self.assertRaises(tkinter.TclError):
root.tk.call('after', 'info', idle1)
tests_gui = (MiscTest, )
if __name__ == "__main__":
run_unittest(*tests_gui)