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@@ -1,35 +1,49 b'' | |||
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1 | 1 | import sys |
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2 | import os | |
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2 | 3 | from IPython.external.qt_for_kernel import QtCore, QtGui |
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3 | 4 | |
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4 | 5 | # If we create a QApplication, keep a reference to it so that it doesn't get |
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5 | 6 | # garbage collected. |
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6 | 7 | _appref = None |
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7 | ||
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8 | _already_warned = False | |
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8 | 9 | |
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9 | 10 | def inputhook(context): |
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10 | 11 | global _appref |
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11 | 12 | app = QtCore.QCoreApplication.instance() |
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12 | 13 | if not app: |
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14 | if sys.platform == 'linux': | |
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15 | if not os.environ.get('DISPLAY') \ | |
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16 | and not os.environ.get('WAYLAND_DISPLAY'): | |
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17 | import warnings | |
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18 | global _already_warned | |
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19 | if not _already_warned: | |
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20 | _already_warned = True | |
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21 | warnings.warn( | |
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22 | 'The DISPLAY or WAYLAND_DISPLAY enviroment variable is ' | |
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23 | 'not set or empty and Qt5 requires this enviroment ' | |
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24 | 'variable. Deactivate Qt5 code.' | |
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25 | ) | |
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26 | return | |
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13 | 27 | _appref = app = QtGui.QApplication([" "]) |
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14 | 28 | event_loop = QtCore.QEventLoop(app) |
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15 | 29 | |
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16 | 30 | if sys.platform == 'win32': |
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17 | 31 | # The QSocketNotifier method doesn't appear to work on Windows. |
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18 | 32 | # Use polling instead. |
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19 | 33 | timer = QtCore.QTimer() |
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20 | 34 | timer.timeout.connect(event_loop.quit) |
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21 | 35 | while not context.input_is_ready(): |
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22 | 36 | timer.start(50) # 50 ms |
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23 | 37 | event_loop.exec_() |
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24 | 38 | timer.stop() |
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25 | 39 | else: |
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26 | 40 | # On POSIX platforms, we can use a file descriptor to quit the event |
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27 | 41 | # loop when there is input ready to read. |
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28 | 42 | notifier = QtCore.QSocketNotifier(context.fileno(), |
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29 | 43 | QtCore.QSocketNotifier.Read) |
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30 | 44 | # connect the callback we care about before we turn it on |
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31 | 45 | notifier.activated.connect(event_loop.exit) |
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32 | 46 | notifier.setEnabled(True) |
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33 | 47 | # only start the event loop we are not already flipped |
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34 | 48 | if not context.input_is_ready(): |
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35 | 49 | event_loop.exec_() |
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