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@@ -1,15 +1,32 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 | try: | |
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16 | os.environ['DISPLAY'] # DISPLAY is set | |
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17 | assert os.environ['DISPLAY'] != '' # DISPLAY is not empty | |
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18 | except Exception: | |
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19 | import warnings | |
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20 | global _already_warned | |
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21 | if not _already_warned: | |
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22 | _already_warned = True | |
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23 | warnings.warn( | |
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24 | 'The DISPLAY enviroment variable is not set or empty ' | |
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25 | 'and qt requires this enviroment variable. ' | |
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26 | 'Deaktivate qt code.\n' | |
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27 | 'Backend: {}'.format(QtGui) | |
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28 | ) | |
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29 | return | |
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13 | 30 | _appref = app = QtGui.QApplication([" "]) |
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14 | 31 | event_loop = QtCore.QEventLoop(app) |
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15 | 32 |
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