|
|
"""Base class for a Widget"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2013 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import uuid
|
|
|
|
|
|
from IPython.config import LoggingConfigurable
|
|
|
from IPython.utils.traitlets import Instance, Unicode, Bytes, Bool, Dict, Any
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Code
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class Widget(LoggingConfigurable):
|
|
|
|
|
|
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
|
|
|
def _shell_default(self):
|
|
|
return get_ipython()
|
|
|
iopub_socket = Any()
|
|
|
def _iopub_socket_default(self):
|
|
|
return self.shell.parent.iopub_socket
|
|
|
session = Instance('IPython.kernel.zmq.session.Session')
|
|
|
def _session_default(self):
|
|
|
if self.shell is None:
|
|
|
return
|
|
|
return self.shell.parent.session
|
|
|
|
|
|
topic = Bytes()
|
|
|
def _topic_default(self):
|
|
|
return ('widget-%s' % self.widget_id).encode('ascii')
|
|
|
|
|
|
_destroy_data = Dict(help="data dict, if any, to be included in widget_destroy")
|
|
|
_create_data = Dict(help="data dict, if any, to be included in widget_create")
|
|
|
|
|
|
_destroyed = Bool(False)
|
|
|
widget_type = Unicode('widget')
|
|
|
widget_id = Unicode()
|
|
|
def _widget_id_default(self):
|
|
|
return uuid.uuid4().hex
|
|
|
|
|
|
def _publish_msg(self, msg_type, data=None, **keys):
|
|
|
"""Helper for sending a widget message on IOPub"""
|
|
|
data = {} if data is None else data
|
|
|
self.session.send(self.iopub_socket, msg_type,
|
|
|
dict(data=data, widget_id=self.widget_id, **keys),
|
|
|
ident=self.topic,
|
|
|
)
|
|
|
|
|
|
def __del__(self):
|
|
|
"""trigger destroy on gc"""
|
|
|
self.destroy()
|
|
|
|
|
|
# publishing messages
|
|
|
|
|
|
def create(self):
|
|
|
"""Create the frontend-side version of this widget"""
|
|
|
self._publish_msg('widget_create', self._create_data, widget_type = self.widget_type)
|
|
|
|
|
|
def destroy(self):
|
|
|
"""Destroy the frontend-side version of this widget"""
|
|
|
if self._destroyed:
|
|
|
# only destroy once
|
|
|
return
|
|
|
self._publish_msg('widget_destroy', self._destroy_data)
|
|
|
self._destroyed = True
|
|
|
|
|
|
def update(self, data=None):
|
|
|
"""Update the frontend-side version of this widget"""
|
|
|
self._publish_msg('widget_update', data)
|
|
|
|
|
|
# handling of incoming messages
|
|
|
|
|
|
def handle_destroy(self, data):
|
|
|
"""Handle a widget_destroy message"""
|
|
|
self.log.debug("handle_destroy %s", data)
|
|
|
|
|
|
def handle_update(self, data):
|
|
|
"""Handle a widget_update message"""
|
|
|
self.log.debug("handle_update %s", data)
|
|
|
self.update_data = data
|
|
|
|
|
|
|
|
|
__all__ = ['Widget']
|
|
|
|
