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# (C) Copyright 2004-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" Module containing GUI event processing utility for testing purposes.
"""
from traits.etsconfig.api import ETSConfig
def process_cascade_events():
"""Process all posted events, and attempt to process new events posted by
the processed events.
Cautions:
- An infinite cascade of events will cause this function to enter an
infinite loop.
- There still exists technical difficulties with Qt. On Qt4 + OSX,
QEventLoop.processEvents may report false saying it had found no events
to process even though it actually had processed some.
Consequently the internal loop breaks too early such that there are
still cascaded events unprocessed. Problems are also observed on
Qt5 + Appveyor occasionally. At the very least, events that are already
posted prior to calling this function will be processed.
See enthought/traitsui#951
"""
if ETSConfig.toolkit.startswith("qt"):
from pyface.qt import QtCore
event_loop = QtCore.QEventLoop()
while event_loop.processEvents(QtCore.QEventLoop.ProcessEventsFlag.AllEvents):
pass
else:
from pyface.api import GUI
GUI.process_events()
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