Method test_after_idle

Lib/test/test_tkinter/test_misc.py:181–217

(self)

        self.assertEqual(count, 54)

    def test_after_idle(self):
        root = self.root

        def callback(start=0, step=1, *, end=0):
            nonlocal count
            count = start + step + end

        # Set up with callback with no args.
        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(count, 1)
        with self.assertRaises(tkinter.TclError):
            root.tk.call(script)

        # Set up with callback with args.
        count = 0
        idle1 = root.after_idle(callback, 42, 11)
        root.update_idletasks()  # Process all pending events.
        self.assertEqual(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(count, 53)
        with self.assertRaises(tkinter.TclError):
            root.tk.call(script)

        # Set up with callback with keyword args.
        count = 0
        idle1 = root.after_idle(callback, 42, step=11, end=1)
        root.update()  # Process all pending events.
        self.assertEqual(count, 54)

    def test_after_cancel(self):
        root = self.root