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244 lines
7.8 KiB
Python
244 lines
7.8 KiB
Python
"""Interactive figures in the IPython notebook."""
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# Note: There is a notebook in
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# lib/matplotlib/backends/web_backend/nbagg_uat.ipynb to help verify
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# that changes made maintain expected behaviour.
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from base64 import b64encode
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import io
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import json
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import pathlib
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import uuid
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from ipykernel.comm import Comm
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from IPython.display import display, Javascript, HTML
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from matplotlib import is_interactive
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from matplotlib._pylab_helpers import Gcf
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from matplotlib.backend_bases import _Backend, CloseEvent, NavigationToolbar2
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from .backend_webagg_core import (
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FigureCanvasWebAggCore, FigureManagerWebAgg, NavigationToolbar2WebAgg)
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from .backend_webagg_core import ( # noqa: F401 # pylint: disable=W0611
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TimerTornado, TimerAsyncio)
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def connection_info():
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"""
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Return a string showing the figure and connection status for the backend.
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This is intended as a diagnostic tool, and not for general use.
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"""
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result = [
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'{fig} - {socket}'.format(
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fig=(manager.canvas.figure.get_label()
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or f"Figure {manager.num}"),
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socket=manager.web_sockets)
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for manager in Gcf.get_all_fig_managers()
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]
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if not is_interactive():
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result.append(f'Figures pending show: {len(Gcf.figs)}')
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return '\n'.join(result)
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_FONT_AWESOME_CLASSES = { # font-awesome 4 names
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'home': 'fa fa-home',
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'back': 'fa fa-arrow-left',
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'forward': 'fa fa-arrow-right',
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'zoom_to_rect': 'fa fa-square-o',
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'move': 'fa fa-arrows',
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'download': 'fa fa-floppy-o',
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None: None
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}
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class NavigationIPy(NavigationToolbar2WebAgg):
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# Use the standard toolbar items + download button
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toolitems = [(text, tooltip_text,
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_FONT_AWESOME_CLASSES[image_file], name_of_method)
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for text, tooltip_text, image_file, name_of_method
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in (NavigationToolbar2.toolitems +
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(('Download', 'Download plot', 'download', 'download'),))
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if image_file in _FONT_AWESOME_CLASSES]
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class FigureManagerNbAgg(FigureManagerWebAgg):
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_toolbar2_class = ToolbarCls = NavigationIPy
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def __init__(self, canvas, num):
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self._shown = False
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super().__init__(canvas, num)
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@classmethod
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def create_with_canvas(cls, canvas_class, figure, num):
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canvas = canvas_class(figure)
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manager = cls(canvas, num)
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if is_interactive():
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manager.show()
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canvas.draw_idle()
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def destroy(event):
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canvas.mpl_disconnect(cid)
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Gcf.destroy(manager)
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cid = canvas.mpl_connect('close_event', destroy)
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return manager
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def display_js(self):
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# XXX How to do this just once? It has to deal with multiple
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# browser instances using the same kernel (require.js - but the
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# file isn't static?).
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display(Javascript(FigureManagerNbAgg.get_javascript()))
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def show(self):
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if not self._shown:
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self.display_js()
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self._create_comm()
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else:
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self.canvas.draw_idle()
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self._shown = True
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# plt.figure adds an event which makes the figure in focus the active
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# one. Disable this behaviour, as it results in figures being put as
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# the active figure after they have been shown, even in non-interactive
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# mode.
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if hasattr(self, '_cidgcf'):
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self.canvas.mpl_disconnect(self._cidgcf)
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if not is_interactive():
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from matplotlib._pylab_helpers import Gcf
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Gcf.figs.pop(self.num, None)
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def reshow(self):
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"""
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A special method to re-show the figure in the notebook.
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"""
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self._shown = False
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self.show()
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@property
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def connected(self):
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return bool(self.web_sockets)
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@classmethod
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def get_javascript(cls, stream=None):
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if stream is None:
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output = io.StringIO()
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else:
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output = stream
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super().get_javascript(stream=output)
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output.write((pathlib.Path(__file__).parent
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/ "web_backend/js/nbagg_mpl.js")
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.read_text(encoding="utf-8"))
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if stream is None:
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return output.getvalue()
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def _create_comm(self):
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comm = CommSocket(self)
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self.add_web_socket(comm)
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return comm
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def destroy(self):
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self._send_event('close')
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# need to copy comms as callbacks will modify this list
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for comm in list(self.web_sockets):
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comm.on_close()
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self.clearup_closed()
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def clearup_closed(self):
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"""Clear up any closed Comms."""
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self.web_sockets = {socket for socket in self.web_sockets
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if socket.is_open()}
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if len(self.web_sockets) == 0:
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CloseEvent("close_event", self.canvas)._process()
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def remove_comm(self, comm_id):
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self.web_sockets = {socket for socket in self.web_sockets
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if socket.comm.comm_id != comm_id}
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class FigureCanvasNbAgg(FigureCanvasWebAggCore):
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manager_class = FigureManagerNbAgg
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class CommSocket:
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"""
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Manages the Comm connection between IPython and the browser (client).
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Comms are 2 way, with the CommSocket being able to publish a message
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via the send_json method, and handle a message with on_message. On the
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JS side figure.send_message and figure.ws.onmessage do the sending and
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receiving respectively.
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"""
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def __init__(self, manager):
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self.supports_binary = None
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self.manager = manager
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self.uuid = str(uuid.uuid4())
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# Publish an output area with a unique ID. The javascript can then
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# hook into this area.
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display(HTML("<div id=%r></div>" % self.uuid))
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try:
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self.comm = Comm('matplotlib', data={'id': self.uuid})
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except AttributeError as err:
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raise RuntimeError('Unable to create an IPython notebook Comm '
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'instance. Are you in the IPython '
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'notebook?') from err
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self.comm.on_msg(self.on_message)
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manager = self.manager
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self._ext_close = False
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def _on_close(close_message):
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self._ext_close = True
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manager.remove_comm(close_message['content']['comm_id'])
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manager.clearup_closed()
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self.comm.on_close(_on_close)
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def is_open(self):
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return not (self._ext_close or self.comm._closed)
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def on_close(self):
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# When the socket is closed, deregister the websocket with
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# the FigureManager.
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if self.is_open():
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try:
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self.comm.close()
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except KeyError:
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# apparently already cleaned it up?
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pass
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def send_json(self, content):
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self.comm.send({'data': json.dumps(content)})
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def send_binary(self, blob):
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if self.supports_binary:
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self.comm.send({'blob': 'image/png'}, buffers=[blob])
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else:
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# The comm is ASCII, so we send the image in base64 encoded data
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# URL form.
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data = b64encode(blob).decode('ascii')
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data_uri = f"data:image/png;base64,{data}"
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self.comm.send({'data': data_uri})
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def on_message(self, message):
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# The 'supports_binary' message is relevant to the
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# websocket itself. The other messages get passed along
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# to matplotlib as-is.
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# Every message has a "type" and a "figure_id".
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message = json.loads(message['content']['data'])
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if message['type'] == 'closing':
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self.on_close()
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self.manager.clearup_closed()
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elif message['type'] == 'supports_binary':
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self.supports_binary = message['value']
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else:
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self.manager.handle_json(message)
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@_Backend.export
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class _BackendNbAgg(_Backend):
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FigureCanvas = FigureCanvasNbAgg
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FigureManager = FigureManagerNbAgg
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