mirror of
https://github.com/python/cpython.git
synced 2026-06-21 18:41:52 -04:00
Serhiy Storchaka
2a126a534b
Drive the drag-and-drop protocol (dnd_start and the DndHandler enter/ motion/commit, leave/cancel and end callbacks). Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
99 lines
3.2 KiB
Python
99 lines
3.2 KiB
Python
import unittest
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import tkinter
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from tkinter import dnd
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from test.support import requires
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from test.test_tkinter.support import setUpModule # noqa: F401
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from test.test_tkinter.support import AbstractTkTest
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requires('gui')
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class Target:
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def __init__(self, widget, log):
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self.widget = widget
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self.log = log
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widget.dnd_accept = self.dnd_accept
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def dnd_accept(self, source, event):
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self.log.append('accept')
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return self
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def dnd_enter(self, source, event):
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self.log.append('enter')
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def dnd_motion(self, source, event):
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self.log.append('motion')
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def dnd_leave(self, source, event):
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self.log.append('leave')
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def dnd_commit(self, source, event):
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self.log.append('commit')
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class Source:
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def __init__(self, log):
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self.log = log
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def dnd_end(self, target, event):
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self.log.append('end')
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class FakeEvent:
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def __init__(self, widget, num=1):
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self.num = num
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self.widget = widget
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self.x = self.y = self.x_root = self.y_root = 0
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class DndTest(AbstractTkTest, unittest.TestCase):
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def setUp(self):
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super().setUp()
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self.canvas = tkinter.Canvas(self.root)
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self.canvas.pack()
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# on_motion() locates the target with winfo_containing(). Bypass that
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# real screen lookup, which depends on the window being visible and
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# unobscured, so the test does not hinge on the window manager.
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self.canvas.winfo_containing = lambda x, y: self.canvas
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self.log = []
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self.source = Source(self.log)
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self.target = Target(self.canvas, self.log)
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def test_drag_and_drop(self):
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handler = dnd.dnd_start(self.source, FakeEvent(self.canvas))
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self.assertIsNotNone(handler)
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handler.on_motion(FakeEvent(self.canvas)) # Enter the target.
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handler.on_motion(FakeEvent(self.canvas)) # Move within the target.
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handler.on_release(FakeEvent(self.canvas)) # Drop on the target.
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self.assertEqual(self.log,
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['accept', 'enter', 'accept', 'motion', 'commit', 'end'])
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def test_cancel(self):
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handler = dnd.dnd_start(self.source, FakeEvent(self.canvas))
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handler.on_motion(FakeEvent(self.canvas)) # Enter the target.
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handler.cancel() # Leaves the target without committing.
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self.assertEqual(self.log, ['accept', 'enter', 'leave', 'end'])
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def test_no_target(self):
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# Nothing under the pointer accepts the drag.
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self.canvas.winfo_containing = lambda x, y: None
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handler = dnd.dnd_start(self.source, FakeEvent(self.canvas))
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handler.on_motion(FakeEvent(self.canvas))
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handler.on_release(FakeEvent(self.canvas))
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self.assertEqual(self.log, ['end'])
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def test_no_recursive_start(self):
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handler = dnd.dnd_start(self.source, FakeEvent(self.canvas))
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self.assertIsNotNone(handler)
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# A drag is already in progress, so a second start is ignored.
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self.assertIsNone(dnd.dnd_start(self.source, FakeEvent(self.canvas)))
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handler.cancel()
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def test_high_button_number_ignored(self):
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self.assertIsNone(dnd.dnd_start(self.source, FakeEvent(self.canvas, num=6)))
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if __name__ == "__main__":
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unittest.main()
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