bpo-42721: Improve using simple dialogs without root window (GH-23897)
When simple query dialogs (tkinter.simpledialog), message boxes (tkinter.messagebox) or color choose dialog (tkinter.colorchooser) are created without arguments master and parent, and the default root window is not yet created, a new temporary hidden root window will be created automatically. It will not be set as the default root window and will be destroyed right after closing the dialog window. It will help to use these simple dialog windows in programs which do not need other GUI. Previously, message boxes and color chooser created the blank root window and left it after closing the dialog window, and query dialogs just raised an exception. Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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586f3dbe15
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675c97eb6c
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@ -300,6 +300,31 @@ def _get_default_root(what=None):
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return _default_root
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def _get_temp_root():
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global _support_default_root
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if not _support_default_root:
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raise RuntimeError("No master specified and tkinter is "
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"configured to not support default root")
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root = _default_root
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if root is None:
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assert _support_default_root
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_support_default_root = False
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root = Tk()
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_support_default_root = True
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assert _default_root is None
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root.withdraw()
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root._temporary = True
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return root
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def _destroy_temp_root(master):
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if getattr(master, '_temporary', False):
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try:
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master.destroy()
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except TclError:
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pass
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def _tkerror(err):
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"""Internal function."""
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pass
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@ -10,7 +10,7 @@
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__all__ = ["Dialog"]
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from tkinter import Frame
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from tkinter import Frame, _get_temp_root, _destroy_temp_root
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class Dialog:
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@ -37,22 +37,17 @@ class Dialog:
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self._fixoptions()
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# we need a dummy widget to properly process the options
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# (at least as long as we use Tkinter 1.63)
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w = Frame(self.master)
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master = self.master
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if master is None:
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master = _get_temp_root()
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try:
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s = w.tk.call(self.command, *w._options(self.options))
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s = self._fixresult(w, s)
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self._test_callback(master) # The function below is replaced for some tests.
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s = master.tk.call(self.command, *master._options(self.options))
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s = self._fixresult(master, s)
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finally:
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try:
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# get rid of the widget
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w.destroy()
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except:
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pass
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_destroy_temp_root(master)
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return s
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def _test_callback(self, master):
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pass
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@ -24,7 +24,8 @@ askstring -- get a string from the user
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"""
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from tkinter import *
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from tkinter import messagebox, _get_default_root
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from tkinter import _get_temp_root, _destroy_temp_root
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from tkinter import messagebox
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class SimpleDialog:
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@ -100,7 +101,7 @@ class Dialog(Toplevel):
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'''
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master = parent
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if master is None:
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master = _get_default_root('create dialog window')
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master = _get_temp_root()
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Toplevel.__init__(self, master)
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@ -142,6 +143,7 @@ class Dialog(Toplevel):
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'''Destroy the window'''
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self.initial_focus = None
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Toplevel.destroy(self)
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_destroy_temp_root(self.master)
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#
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# construction hooks
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@ -0,0 +1,39 @@
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import unittest
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import tkinter
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from test.support import requires, run_unittest, swap_attr
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from tkinter.test.support import AbstractDefaultRootTest
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from tkinter.commondialog import Dialog
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from tkinter.colorchooser import askcolor
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requires('gui')
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class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
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def test_askcolor(self):
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def test_callback(dialog, master):
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nonlocal ismapped
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master.update()
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ismapped = master.winfo_ismapped()
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raise ZeroDivisionError
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with swap_attr(Dialog, '_test_callback', test_callback):
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ismapped = None
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self.assertRaises(ZeroDivisionError, askcolor)
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#askcolor()
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self.assertEqual(ismapped, False)
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root = tkinter.Tk()
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ismapped = None
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self.assertRaises(ZeroDivisionError, askcolor)
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self.assertEqual(ismapped, True)
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root.destroy()
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tkinter.NoDefaultRoot()
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self.assertRaises(RuntimeError, askcolor)
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tests_gui = (DefaultRootTest,)
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if __name__ == "__main__":
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run_unittest(*tests_gui)
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@ -0,0 +1,38 @@
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import unittest
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import tkinter
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from test.support import requires, run_unittest, swap_attr
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from tkinter.test.support import AbstractDefaultRootTest
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from tkinter.commondialog import Dialog
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from tkinter.messagebox import showinfo
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requires('gui')
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class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
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def test_showinfo(self):
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def test_callback(dialog, master):
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nonlocal ismapped
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master.update()
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ismapped = master.winfo_ismapped()
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raise ZeroDivisionError
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with swap_attr(Dialog, '_test_callback', test_callback):
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ismapped = None
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self.assertRaises(ZeroDivisionError, showinfo, "Spam", "Egg Information")
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self.assertEqual(ismapped, False)
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root = tkinter.Tk()
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ismapped = None
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self.assertRaises(ZeroDivisionError, showinfo, "Spam", "Egg Information")
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self.assertEqual(ismapped, True)
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root.destroy()
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tkinter.NoDefaultRoot()
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self.assertRaises(RuntimeError, showinfo, "Spam", "Egg Information")
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tests_gui = (DefaultRootTest,)
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if __name__ == "__main__":
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run_unittest(*tests_gui)
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@ -10,11 +10,23 @@ requires('gui')
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class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
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def test_askinteger(self):
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self.assertRaises(RuntimeError, askinteger, "Go To Line", "Line number")
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root = tkinter.Tk()
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with swap_attr(Dialog, 'wait_window', lambda self, w: w.destroy()):
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@staticmethod
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def mock_wait_window(w):
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nonlocal ismapped
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ismapped = w.master.winfo_ismapped()
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w.destroy()
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with swap_attr(Dialog, 'wait_window', mock_wait_window):
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ismapped = None
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askinteger("Go To Line", "Line number")
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self.assertEqual(ismapped, False)
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root = tkinter.Tk()
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ismapped = None
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askinteger("Go To Line", "Line number")
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self.assertEqual(ismapped, True)
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root.destroy()
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tkinter.NoDefaultRoot()
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self.assertRaises(RuntimeError, askinteger, "Go To Line", "Line number")
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@ -0,0 +1,9 @@
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When simple query dialogs (:mod:`tkinter.simpledialog`), message boxes
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(:mod:`tkinter.messagebox`) or color choose dialog
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(:mod:`tkinter.colorchooser`) are created without arguments *master* and
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*parent*, and the default root window is not yet created, and
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:func:`~tkinter.NoDefaultRoot` was not called, a new temporal
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hidden root window will be created automatically. It will not be set as the
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default root window and will be destroyed right after closing the dialog
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window. It will help to use these simple dialog windows in programs which
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do not need other GUI.
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