def __init__(self, **traits):
""" Initialize the Qt server. This simply configures the widget to serve
the Python model.
"""
# This statement makes sure that when we dispatch traits events on the
# 'ui' thread, it passes on those events through the Qt layer.
set_ui_handler(ui_handler)
super(QtServer, self).__init__(**traits)
self.webview.setUrl(self.home_url)
self._enable_qwidget_embedding()
return
def __init__(self, **traits):
""" Initialize the Qt server.
This simply configures the widget to serve the Python model.
"""
# This statement makes sure that when we dispatch traits events on the
# 'ui' thread, it passes on those events through the Qt layer.
set_ui_handler(ui_handler)
super(QtServer, self).__init__(**traits)
self.webview.setUrl(self.home_url)
self._enable_qwidget_embedding()
return
Created on Jan 4, 2018
@author: brian
'''
# select the 'null' pyface toolkit. an exception is raised if the qt toolkit
# is subsequently imported, but that's better than trying to actually create
# a Qt app if PyQt is accidentally imported.
from traits.etsconfig.api import ETSConfig
ETSConfig.toolkit = 'null'
# even so, sometimes events get dispatched to the UI handler.
# make sure they go into a black hole
from traits.trait_notifiers import set_ui_handler
set_ui_handler(lambda *x, **y: None)
# use the sphinx autodoc module-mocker to mock out traitsui.qt4
# because when it's imported, it starts a Qt Application
from cytoflowgui.tests.sphinx_mock import MockFinder
import sys
sys.meta_path.insert(0, MockFinder(['traitsui.qt4']))
# make sure that even if we're running locally, we're using the Agg output
import matplotlib
matplotlib.use("Agg")
import unittest, multiprocessing, os, logging
from logging.handlers import QueueHandler, QueueListener
def _finished(self):
""" Remove the call from the list, so it can be garbage collected.
"""
self._calls_mutex.lock()
del self._calls[self._calls.index(self)]
self._calls_mutex.unlock()
def ui_handler(handler, *args, **kwds):
""" Handles UI notification handler requests that occur on a thread other
than the UI thread.
"""
_CallAfter(handler, *args, **kwds)
# Tell the traits notification handlers to use this UI handler
set_ui_handler(ui_handler)
#-------------------------------------------------------------------------
# 'GUIToolkit' class:
#-------------------------------------------------------------------------
class GUIToolkit(Toolkit):
""" Implementation class for PyQt toolkit.
"""
#-------------------------------------------------------------------------
# Create PyQt specific user interfaces using information from the
# specified UI object:
#-------------------------------------------------------------------------
def ui_panel(self, ui, parent):
import wx
from traits.trait_notifiers import set_ui_handler, ui_handler
from pyface.base_toolkit import Toolkit
from .gui import GUI
# Check the version number is late enough.
if wx.VERSION < (2, 8):
raise RuntimeError("Need wx version 2.8 or higher, but got %s" %
str(wx.VERSION))
# It's possible that it has already been initialised.
_app = wx.GetApp()
if _app is None:
_app = wx.App()
# stop logging to a modal window by default
# (apps can override by setting a different active target)
_log = wx.LogStderr()
wx.Log.SetActiveTarget(_log)
# create the toolkit object
toolkit_object = Toolkit('pyface', 'wx', 'pyface.ui.wx')
# ensure that Traits has a UI handler appropriate for the toolkit.
if ui_handler is None:
# Tell the traits notification handlers to use this UI handler
set_ui_handler(GUI.invoke_later)
def init_traitsui_handler():
''' Setup handler for traits notification in Qt GUI.
This function needs to be called before using traits notification which
trigger GUI modification from non-principal threads.
**WARNING**: depending on the Qt bindings (PyQt or PySide), this function
may instantiate a QApplication. It seems that when using PyQt4,
QApplication is not instantiated, whereas when using PySide, it is.
This means that after this function has been called, one must check if
the application has been created before recreating it:
::
app = QtGui.QApplication.instance()
if not app:
app = QtGui.QApplication(sys.argv)
This behaviour is triggered somewhere in the traitsui.qt4.toolkit module,
we cannot change it easily.
'''
global traits_ui_handler_initialized
from . import QtCore, QtGui
if traits_ui_handler_initialized:
return # already done
try:
if get_qt_backend() in ('PyQt4', 'PySide'):
from traitsui.qt4 import toolkit
else:
# if using Qt5 we must not import traitsui.qt4, which would cause
# a crash. Then use the code taken from traitsui.qt4.toolkit
# in a qt-independent manner
raise ImportError('traitsui doesn\'t provide a PyQt5 backend')
except Exception:
# copy of the code from traitsui.qt4.toolkit
from traits.trait_notifiers import set_ui_handler
#-------------------------------------------------------------------------------
# Handles UI notification handler requests that occur on a thread other than
# the UI thread:
#-------------------------------------------------------------------------------
_QT_TRAITS_EVENT = QtCore.QEvent.Type(
QtCore.QEvent.registerEventType())
class _CallAfter(QtCore.QObject):
""" This class dispatches a handler so that it executes in the main GUI
thread (similar to the wx function).
"""
# The list of pending calls.
_calls = []
# The mutex around the list of pending calls.
_calls_mutex = QtCore.QMutex()
def __init__(self, handler, *args, **kwds):
""" Initialise the call.
"""
QtCore.QObject.__init__(self)
# Save the details of the call.
self._handler = handler
self._args = args
self._kwds = kwds
# Add this to the list.
self._calls_mutex.lock()
self._calls.append(self)
self._calls_mutex.unlock()
# Move to the main GUI thread.
self.moveToThread(QtGui.QApplication.instance().thread())
# Post an event to be dispatched on the main GUI thread. Note that
# we do not call QTimer.singleShot, which would be simpler, because
# that only works on QThreads. We want regular Python threads to work.
event = QtCore.QEvent(_QT_TRAITS_EVENT)
QtGui.QApplication.instance().postEvent(self, event)
def event(self, event):
""" QObject event handler.
"""
if event.type() == _QT_TRAITS_EVENT:
# Invoke the handler
self._handler(*self._args, **self._kwds)
# We cannot remove from self._calls here. QObjects don't like being
# garbage collected during event handlers (there are tracebacks,
# plus maybe a memory leak, I think).
QtCore.QTimer.singleShot(0, self._finished)
return True
else:
return QtCore.QObject.event(self, event)
def _finished(self):
""" Remove the call from the list, so it can be garbage collected.
"""
self._calls_mutex.lock()
del self._calls[self._calls.index(self)]
self._calls_mutex.unlock()
def ui_handler(handler, *args, **kwds):
""" Handles UI notification handler requests that occur on a thread other
than the UI thread.
"""
_CallAfter(handler, *args, **kwds)
# Tell the traits notification handlers to use this UI handler
set_ui_handler(ui_handler)
from .gui import GUI
# Check the version number is late enough.
if wx.VERSION < (2, 8):
raise RuntimeError(
"Need wx version 2.8 or higher, but got %s" % str(wx.VERSION)
)
# It's possible that it has already been initialised.
_app = wx.GetApp()
if _app is None:
_app = wx.App()
# stop logging to a modal window by default
# (apps can override by setting a different active target)
_log = wx.LogStderr()
wx.Log.SetActiveTarget(_log)
# create the toolkit object
toolkit_object = Toolkit('pyface', 'wx', 'pyface.ui.wx')
# ensure that Traits has a UI handler appropriate for the toolkit.
if ui_handler is None:
# Tell the traits notification handlers to use this UI handler
set_ui_handler(GUI.invoke_later)
