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qt.py
30 lines | 1.0 KiB | text/x-python | PythonLexer
import sys
from IPython.external.qt_for_kernel import QtCore, QtGui
# If we create a QApplication, keep a reference to it so that it doesn't get
# garbage collected.
_appref = None
def inputhook(context):
global _appref
app = QtCore.QCoreApplication.instance()
if not app:
_appref = app = QtGui.QApplication([" "])
event_loop = QtCore.QEventLoop(app)
if sys.platform == 'win32':
# The QSocketNotifier method doesn't appear to work on Windows.
# Use polling instead.
timer = QtCore.QTimer()
timer.timeout.connect(event_loop.quit)
while not context.input_is_ready():
timer.start(50) # 50 ms
event_loop.exec_()
timer.stop()
else:
# On POSIX platforms, we can use a file descriptor to quit the event
# loop when there is input ready to read.
notifier = QtCore.QSocketNotifier(context.fileno(), QtCore.QSocketNotifier.Read)
notifier.setEnabled(True)
notifier.activated.connect(event_loop.exit)
event_loop.exec_()