|
|
"""
|
|
|
This module contains factory functions that attempt
|
|
|
to return Qt submodules from the various python Qt bindings.
|
|
|
|
|
|
It also protects against double-importing Qt with different
|
|
|
bindings, which is unstable and likely to crash
|
|
|
|
|
|
This is used primarily by qt and qt_for_kernel, and shouldn't
|
|
|
be accessed directly from the outside
|
|
|
"""
|
|
|
import sys
|
|
|
import types
|
|
|
from functools import partial
|
|
|
from importlib import import_module
|
|
|
|
|
|
from IPython.utils.version import check_version
|
|
|
|
|
|
# Available APIs.
|
|
|
QT_API_PYQT = 'pyqt' # Force version 2
|
|
|
QT_API_PYQT5 = 'pyqt5'
|
|
|
QT_API_PYQTv1 = 'pyqtv1' # Force version 2
|
|
|
QT_API_PYQT_DEFAULT = 'pyqtdefault' # use system default for version 1 vs. 2
|
|
|
QT_API_PYSIDE = 'pyside'
|
|
|
QT_API_PYSIDE2 = 'pyside2'
|
|
|
|
|
|
api_to_module = {QT_API_PYSIDE2: 'PySide2',
|
|
|
QT_API_PYSIDE: 'PySide',
|
|
|
QT_API_PYQT: 'PyQt4',
|
|
|
QT_API_PYQTv1: 'PyQt4',
|
|
|
QT_API_PYQT5: 'PyQt5',
|
|
|
QT_API_PYQT_DEFAULT: 'PyQt4',
|
|
|
}
|
|
|
|
|
|
|
|
|
class ImportDenier(object):
|
|
|
"""Import Hook that will guard against bad Qt imports
|
|
|
once IPython commits to a specific binding
|
|
|
"""
|
|
|
|
|
|
def __init__(self):
|
|
|
self.__forbidden = set()
|
|
|
|
|
|
def forbid(self, module_name):
|
|
|
sys.modules.pop(module_name, None)
|
|
|
self.__forbidden.add(module_name)
|
|
|
|
|
|
def find_module(self, fullname, path=None):
|
|
|
if path:
|
|
|
return
|
|
|
if fullname in self.__forbidden:
|
|
|
return self
|
|
|
|
|
|
def load_module(self, fullname):
|
|
|
raise ImportError("""
|
|
|
Importing %s disabled by IPython, which has
|
|
|
already imported an Incompatible QT Binding: %s
|
|
|
""" % (fullname, loaded_api()))
|
|
|
|
|
|
ID = ImportDenier()
|
|
|
sys.meta_path.insert(0, ID)
|
|
|
|
|
|
|
|
|
def commit_api(api):
|
|
|
"""Commit to a particular API, and trigger ImportErrors on subsequent
|
|
|
dangerous imports"""
|
|
|
|
|
|
if api == QT_API_PYSIDE2:
|
|
|
ID.forbid('PySide')
|
|
|
ID.forbid('PyQt4')
|
|
|
ID.forbid('PyQt5')
|
|
|
elif api == QT_API_PYSIDE:
|
|
|
ID.forbid('PySide2')
|
|
|
ID.forbid('PyQt4')
|
|
|
ID.forbid('PyQt5')
|
|
|
elif api == QT_API_PYQT5:
|
|
|
ID.forbid('PySide2')
|
|
|
ID.forbid('PySide')
|
|
|
ID.forbid('PyQt4')
|
|
|
else: # There are three other possibilities, all representing PyQt4
|
|
|
ID.forbid('PyQt5')
|
|
|
ID.forbid('PySide2')
|
|
|
ID.forbid('PySide')
|
|
|
|
|
|
|
|
|
def loaded_api():
|
|
|
"""Return which API is loaded, if any
|
|
|
|
|
|
If this returns anything besides None,
|
|
|
importing any other Qt binding is unsafe.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
None, 'pyside2', 'pyside', 'pyqt', 'pyqt5', or 'pyqtv1'
|
|
|
"""
|
|
|
if 'PyQt4.QtCore' in sys.modules:
|
|
|
if qtapi_version() == 2:
|
|
|
return QT_API_PYQT
|
|
|
else:
|
|
|
return QT_API_PYQTv1
|
|
|
elif 'PySide.QtCore' in sys.modules:
|
|
|
return QT_API_PYSIDE
|
|
|
elif 'PySide2.QtCore' in sys.modules:
|
|
|
return QT_API_PYSIDE2
|
|
|
elif 'PyQt5.QtCore' in sys.modules:
|
|
|
return QT_API_PYQT5
|
|
|
return None
|
|
|
|
|
|
|
|
|
def has_binding(api):
|
|
|
"""Safely check for PyQt4/5, PySide or PySide2, without importing submodules
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
api : str [ 'pyqtv1' | 'pyqt' | 'pyqt5' | 'pyside' | 'pyside2' | 'pyqtdefault']
|
|
|
Which module to check for
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
True if the relevant module appears to be importable
|
|
|
"""
|
|
|
module_name = api_to_module[api]
|
|
|
from importlib.util import find_spec
|
|
|
|
|
|
required = ['QtCore', 'QtGui', 'QtSvg']
|
|
|
if api in (QT_API_PYQT5, QT_API_PYSIDE2):
|
|
|
# QT5 requires QtWidgets too
|
|
|
required.append('QtWidgets')
|
|
|
|
|
|
for submod in required:
|
|
|
try:
|
|
|
spec = find_spec('%s.%s' % (module_name, submod))
|
|
|
except ImportError:
|
|
|
# Package (e.g. PyQt5) not found
|
|
|
return False
|
|
|
else:
|
|
|
if spec is None:
|
|
|
# Submodule (e.g. PyQt5.QtCore) not found
|
|
|
return False
|
|
|
|
|
|
if api == QT_API_PYSIDE:
|
|
|
# We can also safely check PySide version
|
|
|
import PySide
|
|
|
return check_version(PySide.__version__, '1.0.3')
|
|
|
|
|
|
return True
|
|
|
|
|
|
|
|
|
def qtapi_version():
|
|
|
"""Return which QString API has been set, if any
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The QString API version (1 or 2), or None if not set
|
|
|
"""
|
|
|
try:
|
|
|
import sip
|
|
|
except ImportError:
|
|
|
return
|
|
|
try:
|
|
|
return sip.getapi('QString')
|
|
|
except ValueError:
|
|
|
return
|
|
|
|
|
|
|
|
|
def can_import(api):
|
|
|
"""Safely query whether an API is importable, without importing it"""
|
|
|
if not has_binding(api):
|
|
|
return False
|
|
|
|
|
|
current = loaded_api()
|
|
|
if api == QT_API_PYQT_DEFAULT:
|
|
|
return current in [QT_API_PYQT, QT_API_PYQTv1, None]
|
|
|
else:
|
|
|
return current in [api, None]
|
|
|
|
|
|
|
|
|
def import_pyqt4(version=2):
|
|
|
"""
|
|
|
Import PyQt4
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
version : 1, 2, or None
|
|
|
Which QString/QVariant API to use. Set to None to use the system
|
|
|
default
|
|
|
|
|
|
ImportErrors rasied within this function are non-recoverable
|
|
|
"""
|
|
|
# The new-style string API (version=2) automatically
|
|
|
# converts QStrings to Unicode Python strings. Also, automatically unpacks
|
|
|
# QVariants to their underlying objects.
|
|
|
import sip
|
|
|
|
|
|
if version is not None:
|
|
|
sip.setapi('QString', version)
|
|
|
sip.setapi('QVariant', version)
|
|
|
|
|
|
from PyQt4 import QtGui, QtCore, QtSvg
|
|
|
|
|
|
if not check_version(QtCore.PYQT_VERSION_STR, '4.7'):
|
|
|
raise ImportError("IPython requires PyQt4 >= 4.7, found %s" %
|
|
|
QtCore.PYQT_VERSION_STR)
|
|
|
|
|
|
# Alias PyQt-specific functions for PySide compatibility.
|
|
|
QtCore.Signal = QtCore.pyqtSignal
|
|
|
QtCore.Slot = QtCore.pyqtSlot
|
|
|
|
|
|
# query for the API version (in case version == None)
|
|
|
version = sip.getapi('QString')
|
|
|
api = QT_API_PYQTv1 if version == 1 else QT_API_PYQT
|
|
|
return QtCore, QtGui, QtSvg, api
|
|
|
|
|
|
|
|
|
def import_pyqt5():
|
|
|
"""
|
|
|
Import PyQt5
|
|
|
|
|
|
ImportErrors rasied within this function are non-recoverable
|
|
|
"""
|
|
|
|
|
|
from PyQt5 import QtCore, QtSvg, QtWidgets, QtGui
|
|
|
|
|
|
# Alias PyQt-specific functions for PySide compatibility.
|
|
|
QtCore.Signal = QtCore.pyqtSignal
|
|
|
QtCore.Slot = QtCore.pyqtSlot
|
|
|
|
|
|
# Join QtGui and QtWidgets for Qt4 compatibility.
|
|
|
QtGuiCompat = types.ModuleType('QtGuiCompat')
|
|
|
QtGuiCompat.__dict__.update(QtGui.__dict__)
|
|
|
QtGuiCompat.__dict__.update(QtWidgets.__dict__)
|
|
|
|
|
|
api = QT_API_PYQT5
|
|
|
return QtCore, QtGuiCompat, QtSvg, api
|
|
|
|
|
|
|
|
|
def import_pyside():
|
|
|
"""
|
|
|
Import PySide
|
|
|
|
|
|
ImportErrors raised within this function are non-recoverable
|
|
|
"""
|
|
|
from PySide import QtGui, QtCore, QtSvg
|
|
|
return QtCore, QtGui, QtSvg, QT_API_PYSIDE
|
|
|
|
|
|
def import_pyside2():
|
|
|
"""
|
|
|
Import PySide2
|
|
|
|
|
|
ImportErrors raised within this function are non-recoverable
|
|
|
"""
|
|
|
from PySide2 import QtGui, QtCore, QtSvg, QtWidgets, QtPrintSupport
|
|
|
|
|
|
# Join QtGui and QtWidgets for Qt4 compatibility.
|
|
|
QtGuiCompat = types.ModuleType('QtGuiCompat')
|
|
|
QtGuiCompat.__dict__.update(QtGui.__dict__)
|
|
|
QtGuiCompat.__dict__.update(QtWidgets.__dict__)
|
|
|
QtGuiCompat.__dict__.update(QtPrintSupport.__dict__)
|
|
|
|
|
|
return QtCore, QtGuiCompat, QtSvg, QT_API_PYSIDE2
|
|
|
|
|
|
|
|
|
def load_qt(api_options):
|
|
|
"""
|
|
|
Attempt to import Qt, given a preference list
|
|
|
of permissible bindings
|
|
|
|
|
|
It is safe to call this function multiple times.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
api_options: List of strings
|
|
|
The order of APIs to try. Valid items are 'pyside', 'pyside2',
|
|
|
'pyqt', 'pyqt5', 'pyqtv1' and 'pyqtdefault'
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
|
|
|
A tuple of QtCore, QtGui, QtSvg, QT_API
|
|
|
The first three are the Qt modules. The last is the
|
|
|
string indicating which module was loaded.
|
|
|
|
|
|
Raises
|
|
|
------
|
|
|
ImportError, if it isn't possible to import any requested
|
|
|
bindings (either because they aren't installed, or because
|
|
|
an incompatible library has already been installed)
|
|
|
"""
|
|
|
loaders = {
|
|
|
QT_API_PYSIDE2: import_pyside2,
|
|
|
QT_API_PYSIDE: import_pyside,
|
|
|
QT_API_PYQT: import_pyqt4,
|
|
|
QT_API_PYQT5: import_pyqt5,
|
|
|
QT_API_PYQTv1: partial(import_pyqt4, version=1),
|
|
|
QT_API_PYQT_DEFAULT: partial(import_pyqt4, version=None)
|
|
|
}
|
|
|
|
|
|
for api in api_options:
|
|
|
|
|
|
if api not in loaders:
|
|
|
raise RuntimeError(
|
|
|
"Invalid Qt API %r, valid values are: %s" %
|
|
|
(api, ", ".join(["%r" % k for k in loaders.keys()])))
|
|
|
|
|
|
if not can_import(api):
|
|
|
continue
|
|
|
|
|
|
#cannot safely recover from an ImportError during this
|
|
|
result = loaders[api]()
|
|
|
api = result[-1] # changed if api = QT_API_PYQT_DEFAULT
|
|
|
commit_api(api)
|
|
|
return result
|
|
|
else:
|
|
|
raise ImportError("""
|
|
|
Could not load requested Qt binding. Please ensure that
|
|
|
PyQt4 >= 4.7, PyQt5, PySide >= 1.0.3 or PySide2 is available,
|
|
|
and only one is imported per session.
|
|
|
|
|
|
Currently-imported Qt library: %r
|
|
|
PyQt4 available (requires QtCore, QtGui, QtSvg): %s
|
|
|
PyQt5 available (requires QtCore, QtGui, QtSvg, QtWidgets): %s
|
|
|
PySide >= 1.0.3 installed: %s
|
|
|
PySide2 installed: %s
|
|
|
Tried to load: %r
|
|
|
""" % (loaded_api(),
|
|
|
has_binding(QT_API_PYQT),
|
|
|
has_binding(QT_API_PYQT5),
|
|
|
has_binding(QT_API_PYSIDE),
|
|
|
has_binding(QT_API_PYSIDE2),
|
|
|
api_options))
|
|
|
|
