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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2004-2017 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
"""This module provides an IPython console widget.
You can push variables - any python object - to the
console's interactive namespace. This provides users with an advanced way
of interacting with your program. For instance, if your program has a
:class:`PlotWidget` or a :class:`PlotWindow`, you can push a reference to
these widgets to allow your users to add curves, save data to files… by using
the widgets' methods from the console.
.. note::
This module has a dependency on
`IPython <https://pypi.python.org/pypi/ipython>`_ and
`qtconsole <https://pypi.python.org/pypi/qtconsole>`_ (or *ipython.qt* for
older versions of *IPython*). An ``ImportError`` will be raised if it is
imported while the dependencies are not satisfied.
Basic usage example::
from silx.gui import qt
from silx.gui.console import IPythonWidget
app = qt.QApplication([])
hello_button = qt.QPushButton("Hello World!", None)
hello_button.show()
console = IPythonWidget()
console.show()
console.pushVariables({"the_button": hello_button})
app.exec_()
This program will display a console widget and a push button in two separate
windows. You will be able to interact with the button from the console,
for example change its text::
>>> the_button.setText("Spam spam")
An IPython interactive console is a powerful tool that enables you to work
with data and plot it.
See `this tutorial <https://plot.ly/python/ipython-notebook-tutorial/>`_
for more information on some of the rich features of IPython.
"""
__authors__ = ["Tim Rae", "V.A. Sole", "P. Knobel"]
__license__ = "MIT"
__date__ = "24/05/2016"
import logging
from . import qt
_logger = logging.getLogger(__name__)
try:
import IPython
except ImportError as e:
raise ImportError("Failed to import IPython, required by " + __name__)
# This widget cannot be used inside an interactive IPython shell.
# It would raise MultipleInstanceError("Multiple incompatible subclass
# instances of InProcessInteractiveShell are being created").
try:
__IPYTHON__
except NameError:
pass # Not in IPython
else:
msg = "Module " + __name__ + " cannot be used within an IPython shell"
raise ImportError(msg)
# qtconsole is a separate module in recent versions of IPython/Jupyter
# http://blog.jupyter.org/2015/04/15/the-big-split/
if IPython.__version__.startswith("2"):
qtconsole = None
else:
try:
import qtconsole
except ImportError:
qtconsole = None
if qtconsole is not None:
try:
from qtconsole.rich_ipython_widget import RichJupyterWidget as \
RichIPythonWidget
except ImportError:
try:
from qtconsole.rich_ipython_widget import RichIPythonWidget
except ImportError as e:
qtconsole = None
else:
from qtconsole.inprocess import QtInProcessKernelManager
else:
from qtconsole.inprocess import QtInProcessKernelManager
if qtconsole is None:
# Import the console machinery from ipython
# The `has_binding` test of IPython does not find the Qt bindings
# in case silx is used in a frozen binary
import IPython.external.qt_loaders
def has_binding(*var, **kw):
return True
IPython.external.qt_loaders.has_binding = has_binding
from IPython.qt.console.rich_ipython_widget import RichIPythonWidget
from IPython.qt.inprocess import QtInProcessKernelManager
class IPythonWidget(RichIPythonWidget):
"""Live IPython console widget.
.. image:: img/IPythonWidget.png
:param custom_banner: Custom welcome message to be printed at the top of
the console.
"""
def __init__(self, parent=None, custom_banner=None, *args, **kwargs):
if parent is not None:
kwargs["parent"] = parent
super(IPythonWidget, self).__init__(*args, **kwargs)
if custom_banner is not None:
self.banner = custom_banner
self.setWindowTitle(self.banner)
self.kernel_manager = kernel_manager = QtInProcessKernelManager()
kernel_manager.start_kernel()
self.kernel_client = kernel_client = self._kernel_manager.client()
kernel_client.start_channels()
def stop():
kernel_client.stop_channels()
kernel_manager.shutdown_kernel()
self.exit_requested.connect(stop)
def sizeHint(self):
"""Return a reasonable default size for usage in :class:`PlotWindow`"""
return qt.QSize(500, 300)
def pushVariables(self, variable_dict):
""" Given a dictionary containing name / value pairs, push those
variables to the IPython console widget.
:param variable_dict: Dictionary of variables to be pushed to the
console's interactive namespace (```{variable_name: object, …}```)
"""
self.kernel_manager.kernel.shell.push(variable_dict)
class IPythonDockWidget(qt.QDockWidget):
"""Dock Widget including a :class:`IPythonWidget` inside
a vertical layout.
.. image:: img/IPythonDockWidget.png
:param available_vars: Dictionary of variables to be pushed to the
console's interactive namespace: ``{"variable_name": object, …}``
:param custom_banner: Custom welcome message to be printed at the top of
the console
:param title: Dock widget title
:param parent: Parent :class:`qt.QMainWindow` containing this
:class:`qt.QDockWidget`
"""
def __init__(self, parent=None, available_vars=None, custom_banner=None,
title="Console"):
super(IPythonDockWidget, self).__init__(title, parent)
self.ipyconsole = IPythonWidget(custom_banner=custom_banner)
self.layout().setContentsMargins(0, 0, 0, 0)
self.setWidget(self.ipyconsole)
if available_vars is not None:
self.ipyconsole.pushVariables(available_vars)
def showEvent(self, event):
"""Make sure this widget is raised when it is shown
(when it is first created as a tab in PlotWindow or when it is shown
again after hiding).
"""
self.raise_()
def main():
"""Run a Qt app with an IPython console"""
app = qt.QApplication([])
widget = IPythonDockWidget()
widget.show()
app.exec_()
if __name__ == '__main__':
main()
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