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# encoding: utf-8
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"""Event loop integration for the ZeroMQ-based kernels.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2011 The IPython Development Team
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import sys
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# System library imports.
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import zmq
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# Local imports.
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from IPython.config.application import Application
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from IPython.utils import io
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#------------------------------------------------------------------------------
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# Eventloops for integrating the Kernel into different GUIs
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#------------------------------------------------------------------------------
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def loop_qt4(kernel):
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"""Start a kernel with PyQt4 event loop integration."""
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from IPython.external.qt_for_kernel import QtCore
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from IPython.lib.guisupport import get_app_qt4, start_event_loop_qt4
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kernel.app = get_app_qt4([" "])
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kernel.app.setQuitOnLastWindowClosed(False)
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kernel.timer = QtCore.QTimer()
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kernel.timer.timeout.connect(kernel.do_one_iteration)
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# Units for the timer are in milliseconds
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kernel.timer.start(1000*kernel._poll_interval)
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start_event_loop_qt4(kernel.app)
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def loop_wx(kernel):
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"""Start a kernel with wx event loop support."""
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import wx
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from IPython.lib.guisupport import start_event_loop_wx
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doi = kernel.do_one_iteration
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# Wx uses milliseconds
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poll_interval = int(1000*kernel._poll_interval)
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# We have to put the wx.Timer in a wx.Frame for it to fire properly.
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# We make the Frame hidden when we create it in the main app below.
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class TimerFrame(wx.Frame):
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def __init__(self, func):
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wx.Frame.__init__(self, None, -1)
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self.timer = wx.Timer(self)
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# Units for the timer are in milliseconds
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self.timer.Start(poll_interval)
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self.Bind(wx.EVT_TIMER, self.on_timer)
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self.func = func
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def on_timer(self, event):
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self.func()
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# We need a custom wx.App to create our Frame subclass that has the
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# wx.Timer to drive the ZMQ event loop.
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class IPWxApp(wx.App):
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def OnInit(self):
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self.frame = TimerFrame(doi)
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self.frame.Show(False)
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return True
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# The redirect=False here makes sure that wx doesn't replace
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# sys.stdout/stderr with its own classes.
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kernel.app = IPWxApp(redirect=False)
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# The import of wx on Linux sets the handler for signal.SIGINT
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# to 0. This is a bug in wx or gtk. We fix by just setting it
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# back to the Python default.
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import signal
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if not callable(signal.getsignal(signal.SIGINT)):
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signal.signal(signal.SIGINT, signal.default_int_handler)
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start_event_loop_wx(kernel.app)
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def loop_tk(kernel):
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"""Start a kernel with the Tk event loop."""
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import Tkinter
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doi = kernel.do_one_iteration
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# Tk uses milliseconds
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poll_interval = int(1000*kernel._poll_interval)
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# For Tkinter, we create a Tk object and call its withdraw method.
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class Timer(object):
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def __init__(self, func):
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self.app = Tkinter.Tk()
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self.app.withdraw()
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self.func = func
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def on_timer(self):
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self.func()
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self.app.after(poll_interval, self.on_timer)
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def start(self):
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self.on_timer() # Call it once to get things going.
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self.app.mainloop()
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kernel.timer = Timer(doi)
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kernel.timer.start()
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def loop_gtk(kernel):
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"""Start the kernel, coordinating with the GTK event loop"""
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from .gui.gtkembed import GTKEmbed
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gtk_kernel = GTKEmbed(kernel)
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gtk_kernel.start()
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def loop_cocoa(kernel):
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"""Start the kernel, coordinating with the Cocoa CFRunLoop event loop
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via the matplotlib MacOSX backend.
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"""
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import matplotlib
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if matplotlib.__version__ < '1.1.0':
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kernel.log.warn(
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"MacOSX backend in matplotlib %s doesn't have a Timer, "
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"falling back on Tk for CFRunLoop integration. Note that "
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"even this won't work if Tk is linked against X11 instead of "
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"Cocoa (e.g. EPD). To use the MacOSX backend in the kernel, "
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"you must use matplotlib >= 1.1.0, or a native libtk."
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)
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return loop_tk(kernel)
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from matplotlib.backends.backend_macosx import TimerMac, show
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# scale interval for sec->ms
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poll_interval = int(1000*kernel._poll_interval)
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real_excepthook = sys.excepthook
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def handle_int(etype, value, tb):
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"""don't let KeyboardInterrupts look like crashes"""
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if etype is KeyboardInterrupt:
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io.raw_print("KeyboardInterrupt caught in CFRunLoop")
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else:
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real_excepthook(etype, value, tb)
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# add doi() as a Timer to the CFRunLoop
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def doi():
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# restore excepthook during IPython code
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sys.excepthook = real_excepthook
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kernel.do_one_iteration()
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# and back:
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sys.excepthook = handle_int
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t = TimerMac(poll_interval)
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t.add_callback(doi)
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t.start()
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# but still need a Poller for when there are no active windows,
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# during which time mainloop() returns immediately
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poller = zmq.Poller()
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if kernel.control_stream:
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poller.register(kernel.control_stream.socket, zmq.POLLIN)
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for stream in kernel.shell_streams:
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poller.register(stream.socket, zmq.POLLIN)
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while True:
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try:
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# double nested try/except, to properly catch KeyboardInterrupt
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# due to pyzmq Issue #130
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try:
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# don't let interrupts during mainloop invoke crash_handler:
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sys.excepthook = handle_int
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show.mainloop()
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sys.excepthook = real_excepthook
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# use poller if mainloop returned (no windows)
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# scale by extra factor of 10, since it's a real poll
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poller.poll(10*poll_interval)
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kernel.do_one_iteration()
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except:
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raise
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except KeyboardInterrupt:
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# Ctrl-C shouldn't crash the kernel
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io.raw_print("KeyboardInterrupt caught in kernel")
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finally:
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# ensure excepthook is restored
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sys.excepthook = real_excepthook
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# mapping of keys to loop functions
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loop_map = {
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'qt' : loop_qt4,
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'qt4': loop_qt4,
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'inline': None,
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'osx': loop_cocoa,
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'wx' : loop_wx,
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'tk' : loop_tk,
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'gtk': loop_gtk,
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None : None,
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}
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def enable_gui(gui, kernel=None):
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"""Enable integration with a given GUI"""
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if gui not in loop_map:
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raise ValueError("GUI %r not supported" % gui)
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if kernel is None:
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if Application.initialized():
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kernel = getattr(Application.instance(), 'kernel', None)
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if kernel is None:
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raise RuntimeError("You didn't specify a kernel,"
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" and no IPython Application with a kernel appears to be running."
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)
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loop = loop_map[gui]
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if kernel.eventloop is not None and kernel.eventloop is not loop:
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raise RuntimeError("Cannot activate multiple GUI eventloops")
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kernel.eventloop = loop
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