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""" Defines an in-process KernelManager with signals and slots.
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"""
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# Local imports.
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from IPython.external.qt import QtCore
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from IPython.kernel.inprocess import (
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InProcessHBChannel, InProcessKernelClient, InProcessKernelManager,
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)
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from IPython.kernel.inprocess.channels import InProcessChannel
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from IPython.utils.traitlets import Type
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from .util import SuperQObject
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from .kernel_mixins import (
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QtKernelClientMixin, QtKernelManagerMixin,
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)
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class QtInProcessChannel(SuperQObject, InProcessChannel):
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# Emitted when the channel is started.
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started = QtCore.Signal()
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# Emitted when the channel is stopped.
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stopped = QtCore.Signal()
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# Emitted when any message is received.
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message_received = QtCore.Signal(object)
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def start(self):
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""" Reimplemented to emit signal.
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"""
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super(QtInProcessChannel, self).start()
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self.started.emit()
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def stop(self):
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""" Reimplemented to emit signal.
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"""
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super(QtInProcessChannel, self).stop()
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self.stopped.emit()
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def call_handlers_later(self, *args, **kwds):
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""" Call the message handlers later.
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"""
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do_later = lambda: self.call_handlers(*args, **kwds)
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QtCore.QTimer.singleShot(0, do_later)
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def call_handlers(self, msg):
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self.message_received.emit(msg)
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def process_events(self):
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""" Process any pending GUI events.
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"""
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QtCore.QCoreApplication.instance().processEvents()
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def flush(self, timeout=1.0):
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""" Reimplemented to ensure that signals are dispatched immediately.
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"""
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super(QtInProcessChannel, self).flush()
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self.process_events()
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class QtInProcessHBChannel(SuperQObject, InProcessHBChannel):
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# This signal will never be fired, but it needs to exist
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kernel_died = QtCore.Signal()
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class QtInProcessKernelClient(QtKernelClientMixin, InProcessKernelClient):
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""" An in-process KernelManager with signals and slots.
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"""
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iopub_channel_class = Type(QtInProcessChannel)
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shell_channel_class = Type(QtInProcessChannel)
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stdin_channel_class = Type(QtInProcessChannel)
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hb_channel_class = Type(QtInProcessHBChannel)
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class QtInProcessKernelManager(QtKernelManagerMixin, InProcessKernelManager):
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client_class = __module__ + '.QtInProcessKernelClient'
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