# Setting the user defined backend
if not IS_EXT_INTERPRETER:
matplotlib.use(mpl_backend)
# Setting the right input hook according to mpl_backend,
# IMPORTANT NOTE: Don't try to abstract the steps to set a PyOS
# input hook callback in a function. It will **crash** the
# interpreter!!
if (mpl_backend == "Qt4Agg" or mpl_backend == "Qt5Agg") and \
os.name == 'nt' and monitor is not None:
# Removing PyQt4 input hook which is not working well on
# Windows since opening a subprocess does not attach a real
# console to it (with keyboard events...)
if qt_api == 'pyqt' or qt_api == 'pyqt5':
inputhooks.remove_pyqt_inputhook()
# Using our own input hook
# NOTE: it's not working correctly for some configurations
# (See issue 1831)
callback = inputhooks.set_pyft_callback(qt_nt_inputhook)
pyos_ih = inputhooks.get_pyos_inputhook()
pyos_ih.value = ctypes.cast(callback, ctypes.c_void_p).value
elif mpl_backend == "Qt4Agg" and qt_api == 'pyside':
# PySide doesn't have an input hook, so we need to install one
# to be able to show plots
# Note: This only works well for Posix systems
callback = inputhooks.set_pyft_callback(inputhooks.qt4)
pyos_ih = inputhooks.get_pyos_inputhook()
pyos_ih.value = ctypes.cast(callback, ctypes.c_void_p).value
elif (mpl_backend != "Qt4Agg" and qt_api == 'pyqt') \
or (mpl_backend != "Qt5Agg" and qt_api == 'pyqt5'):
# Setting the user defined backend
if not IS_EXT_INTERPRETER:
matplotlib.use(mpl_backend)
# Setting the right input hook according to mpl_backend,
# IMPORTANT NOTE: Don't try to abstract the steps to set a PyOS
# input hook callback in a function. It will **crash** the
# interpreter!!
if (mpl_backend == "Qt4Agg" or mpl_backend == "Qt5Agg") and \
os.name == 'nt' and monitor is not None:
# Removing PyQt4 input hook which is not working well on
# Windows since opening a subprocess does not attach a real
# console to it (with keyboard events...)
if qt_api == 'pyqt' or qt_api == 'pyqt5':
inputhooks.remove_pyqt_inputhook()
# Using our own input hook
# NOTE: it's not working correctly for some configurations
# (See issue 1831)
callback = inputhooks.set_pyft_callback(qt_nt_inputhook)
pyos_ih = inputhooks.get_pyos_inputhook()
pyos_ih.value = ctypes.cast(callback, ctypes.c_void_p).value
elif mpl_backend == "Qt4Agg" and qt_api == 'pyside':
# PySide doesn't have an input hook, so we need to install one
# to be able to show plots
# Note: This only works well for Posix systems
callback = inputhooks.set_pyft_callback(inputhooks.qt4)
pyos_ih = inputhooks.get_pyos_inputhook()
pyos_ih.value = ctypes.cast(callback, ctypes.c_void_p).value
elif (mpl_backend != "Qt4Agg" and qt_api == 'pyqt') \
or (mpl_backend != "Qt5Agg" and qt_api == 'pyqt5'):