272 lines
8.7 KiB
Python
272 lines
8.7 KiB
Python
"""Interactive figures in the IPython notebook"""
|
|
# Note: There is a notebook in
|
|
# lib/matplotlib/backends/web_backend/nbagg_uat.ipynb to help verify
|
|
# that changes made maintain expected behaviour.
|
|
|
|
from base64 import b64encode
|
|
import io
|
|
import json
|
|
import pathlib
|
|
import uuid
|
|
|
|
from IPython.display import display, Javascript, HTML
|
|
try:
|
|
# Jupyter/IPython 4.x or later
|
|
from ipykernel.comm import Comm
|
|
except ImportError:
|
|
# Jupyter/IPython 3.x or earlier
|
|
from IPython.kernel.comm import Comm
|
|
|
|
from matplotlib import cbook, is_interactive
|
|
from matplotlib._pylab_helpers import Gcf
|
|
from matplotlib.backend_bases import (
|
|
_Backend, FigureCanvasBase, NavigationToolbar2)
|
|
from matplotlib.backends.backend_webagg_core import (
|
|
FigureCanvasWebAggCore, FigureManagerWebAgg, NavigationToolbar2WebAgg,
|
|
TimerTornado)
|
|
|
|
|
|
def connection_info():
|
|
"""
|
|
Return a string showing the figure and connection status for the backend.
|
|
|
|
This is intended as a diagnostic tool, and not for general use.
|
|
"""
|
|
result = [
|
|
'{fig} - {socket}'.format(
|
|
fig=(manager.canvas.figure.get_label()
|
|
or "Figure {}".format(manager.num)),
|
|
socket=manager.web_sockets)
|
|
for manager in Gcf.get_all_fig_managers()
|
|
]
|
|
if not is_interactive():
|
|
result.append(f'Figures pending show: {len(Gcf.figs)}')
|
|
return '\n'.join(result)
|
|
|
|
|
|
# Note: Version 3.2 and 4.x icons
|
|
# http://fontawesome.io/3.2.1/icons/
|
|
# http://fontawesome.io/
|
|
# the `fa fa-xxx` part targets font-awesome 4, (IPython 3.x)
|
|
# the icon-xxx targets font awesome 3.21 (IPython 2.x)
|
|
_FONT_AWESOME_CLASSES = {
|
|
'home': 'fa fa-home icon-home',
|
|
'back': 'fa fa-arrow-left icon-arrow-left',
|
|
'forward': 'fa fa-arrow-right icon-arrow-right',
|
|
'zoom_to_rect': 'fa fa-square-o icon-check-empty',
|
|
'move': 'fa fa-arrows icon-move',
|
|
'download': 'fa fa-floppy-o icon-save',
|
|
None: None
|
|
}
|
|
|
|
|
|
class NavigationIPy(NavigationToolbar2WebAgg):
|
|
|
|
# Use the standard toolbar items + download button
|
|
toolitems = [(text, tooltip_text,
|
|
_FONT_AWESOME_CLASSES[image_file], name_of_method)
|
|
for text, tooltip_text, image_file, name_of_method
|
|
in (NavigationToolbar2.toolitems +
|
|
(('Download', 'Download plot', 'download', 'download'),))
|
|
if image_file in _FONT_AWESOME_CLASSES]
|
|
|
|
|
|
class FigureManagerNbAgg(FigureManagerWebAgg):
|
|
ToolbarCls = NavigationIPy
|
|
|
|
def __init__(self, canvas, num):
|
|
self._shown = False
|
|
FigureManagerWebAgg.__init__(self, canvas, num)
|
|
|
|
def display_js(self):
|
|
# XXX How to do this just once? It has to deal with multiple
|
|
# browser instances using the same kernel (require.js - but the
|
|
# file isn't static?).
|
|
display(Javascript(FigureManagerNbAgg.get_javascript()))
|
|
|
|
def show(self):
|
|
if not self._shown:
|
|
self.display_js()
|
|
self._create_comm()
|
|
else:
|
|
self.canvas.draw_idle()
|
|
self._shown = True
|
|
|
|
def reshow(self):
|
|
"""
|
|
A special method to re-show the figure in the notebook.
|
|
|
|
"""
|
|
self._shown = False
|
|
self.show()
|
|
|
|
@property
|
|
def connected(self):
|
|
return bool(self.web_sockets)
|
|
|
|
@classmethod
|
|
def get_javascript(cls, stream=None):
|
|
if stream is None:
|
|
output = io.StringIO()
|
|
else:
|
|
output = stream
|
|
super().get_javascript(stream=output)
|
|
output.write((pathlib.Path(__file__).parent
|
|
/ "web_backend/js/nbagg_mpl.js")
|
|
.read_text(encoding="utf-8"))
|
|
if stream is None:
|
|
return output.getvalue()
|
|
|
|
def _create_comm(self):
|
|
comm = CommSocket(self)
|
|
self.add_web_socket(comm)
|
|
return comm
|
|
|
|
def destroy(self):
|
|
self._send_event('close')
|
|
# need to copy comms as callbacks will modify this list
|
|
for comm in list(self.web_sockets):
|
|
comm.on_close()
|
|
self.clearup_closed()
|
|
|
|
def clearup_closed(self):
|
|
"""Clear up any closed Comms."""
|
|
self.web_sockets = {socket for socket in self.web_sockets
|
|
if socket.is_open()}
|
|
|
|
if len(self.web_sockets) == 0:
|
|
self.canvas.close_event()
|
|
|
|
def remove_comm(self, comm_id):
|
|
self.web_sockets = {socket for socket in self.web_sockets
|
|
if socket.comm.comm_id != comm_id}
|
|
|
|
|
|
class FigureCanvasNbAgg(FigureCanvasWebAggCore):
|
|
def new_timer(self, *args, **kwargs):
|
|
# docstring inherited
|
|
return TimerTornado(*args, **kwargs)
|
|
|
|
|
|
class CommSocket:
|
|
"""
|
|
Manages the Comm connection between IPython and the browser (client).
|
|
|
|
Comms are 2 way, with the CommSocket being able to publish a message
|
|
via the send_json method, and handle a message with on_message. On the
|
|
JS side figure.send_message and figure.ws.onmessage do the sending and
|
|
receiving respectively.
|
|
|
|
"""
|
|
def __init__(self, manager):
|
|
self.supports_binary = None
|
|
self.manager = manager
|
|
self.uuid = str(uuid.uuid4())
|
|
# Publish an output area with a unique ID. The javascript can then
|
|
# hook into this area.
|
|
display(HTML("<div id=%r></div>" % self.uuid))
|
|
try:
|
|
self.comm = Comm('matplotlib', data={'id': self.uuid})
|
|
except AttributeError:
|
|
raise RuntimeError('Unable to create an IPython notebook Comm '
|
|
'instance. Are you in the IPython notebook?')
|
|
self.comm.on_msg(self.on_message)
|
|
|
|
manager = self.manager
|
|
self._ext_close = False
|
|
|
|
def _on_close(close_message):
|
|
self._ext_close = True
|
|
manager.remove_comm(close_message['content']['comm_id'])
|
|
manager.clearup_closed()
|
|
|
|
self.comm.on_close(_on_close)
|
|
|
|
def is_open(self):
|
|
return not (self._ext_close or self.comm._closed)
|
|
|
|
def on_close(self):
|
|
# When the socket is closed, deregister the websocket with
|
|
# the FigureManager.
|
|
if self.is_open():
|
|
try:
|
|
self.comm.close()
|
|
except KeyError:
|
|
# apparently already cleaned it up?
|
|
pass
|
|
|
|
def send_json(self, content):
|
|
self.comm.send({'data': json.dumps(content)})
|
|
|
|
def send_binary(self, blob):
|
|
# The comm is ascii, so we always send the image in base64
|
|
# encoded data URL form.
|
|
data = b64encode(blob).decode('ascii')
|
|
data_uri = "data:image/png;base64,{0}".format(data)
|
|
self.comm.send({'data': data_uri})
|
|
|
|
def on_message(self, message):
|
|
# The 'supports_binary' message is relevant to the
|
|
# websocket itself. The other messages get passed along
|
|
# to matplotlib as-is.
|
|
|
|
# Every message has a "type" and a "figure_id".
|
|
message = json.loads(message['content']['data'])
|
|
if message['type'] == 'closing':
|
|
self.on_close()
|
|
self.manager.clearup_closed()
|
|
elif message['type'] == 'supports_binary':
|
|
self.supports_binary = message['value']
|
|
else:
|
|
self.manager.handle_json(message)
|
|
|
|
|
|
@_Backend.export
|
|
class _BackendNbAgg(_Backend):
|
|
FigureCanvas = FigureCanvasNbAgg
|
|
FigureManager = FigureManagerNbAgg
|
|
|
|
@staticmethod
|
|
def new_figure_manager_given_figure(num, figure):
|
|
canvas = FigureCanvasNbAgg(figure)
|
|
manager = FigureManagerNbAgg(canvas, num)
|
|
if is_interactive():
|
|
manager.show()
|
|
figure.canvas.draw_idle()
|
|
canvas.mpl_connect('close_event', lambda event: Gcf.destroy(num))
|
|
return manager
|
|
|
|
@staticmethod
|
|
def trigger_manager_draw(manager):
|
|
manager.show()
|
|
|
|
@staticmethod
|
|
def show(*args, block=None, **kwargs):
|
|
if args or kwargs:
|
|
cbook.warn_deprecated(
|
|
"3.1", message="Passing arguments to show(), other than "
|
|
"passing 'block' by keyword, is deprecated %(since)s, and "
|
|
"support for it will be removed %(removal)s.")
|
|
|
|
## TODO: something to do when keyword block==False ?
|
|
from matplotlib._pylab_helpers import Gcf
|
|
|
|
managers = Gcf.get_all_fig_managers()
|
|
if not managers:
|
|
return
|
|
|
|
interactive = is_interactive()
|
|
|
|
for manager in managers:
|
|
manager.show()
|
|
|
|
# plt.figure adds an event which makes the figure in focus the
|
|
# active one. Disable this behaviour, as it results in
|
|
# figures being put as the active figure after they have been
|
|
# shown, even in non-interactive mode.
|
|
if hasattr(manager, '_cidgcf'):
|
|
manager.canvas.mpl_disconnect(manager._cidgcf)
|
|
|
|
if not interactive:
|
|
Gcf.figs.pop(manager.num, None)
|