| 9 | |
| 10 | |
| 11 | def inputhook(context): |
| 12 | global _appref |
| 13 | app = QtCore.QCoreApplication.instance() |
| 14 | if not app: |
| 15 | if sys.platform == 'linux': |
| 16 | if not os.environ.get('DISPLAY') \ |
| 17 | and not os.environ.get('WAYLAND_DISPLAY'): |
| 18 | import warnings |
| 19 | global _already_warned |
| 20 | if not _already_warned: |
| 21 | _already_warned = True |
| 22 | warnings.warn( |
| 23 | 'The DISPLAY or WAYLAND_DISPLAY environment variable is ' |
| 24 | 'not set or empty and Qt5 requires this environment ' |
| 25 | 'variable. Deactivate Qt5 code.' |
| 26 | ) |
| 27 | return |
| 28 | QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling) |
| 29 | _appref = app = QtGui.QApplication([" "]) |
| 30 | event_loop = QtCore.QEventLoop(app) |
| 31 | |
| 32 | if sys.platform == 'win32': |
| 33 | # The QSocketNotifier method doesn't appear to work on Windows. |
| 34 | # Use polling instead. |
| 35 | timer = QtCore.QTimer() |
| 36 | timer.timeout.connect(event_loop.quit) |
| 37 | while not context.input_is_ready(): |
| 38 | timer.start(50) # 50 ms |
| 39 | event_loop.exec_() |
| 40 | timer.stop() |
| 41 | else: |
| 42 | # On POSIX platforms, we can use a file descriptor to quit the event |
| 43 | # loop when there is input ready to read. |
| 44 | notifier = QtCore.QSocketNotifier(context.fileno(), |
| 45 | QtCore.QSocketNotifier.Read) |
| 46 | try: |
| 47 | # connect the callback we care about before we turn it on |
| 48 | notifier.activated.connect(lambda: event_loop.exit()) |
| 49 | notifier.setEnabled(True) |
| 50 | # only start the event loop we are not already flipped |
| 51 | if not context.input_is_ready(): |
| 52 | event_loop.exec_() |
| 53 | finally: |
| 54 | notifier.setEnabled(False) |