Use _repr_mimebundle_ and require IPython 6.1 or later.

ipywidgets/widgets/interaction.py

@@ -214,8 +214,7 @@ def __init__(self, __interact_f, __options={}, **kwargs):
  else:
  for widget in self.kwargs_widgets:
  widget.observe(self.update, names='value')
-
- self.on_displayed(self.update)
+ self.update()
 
  # Callback function
  def update(self, *args):

ipywidgets/widgets/tests/test_interaction.py

@@ -472,8 +472,8 @@ def test_call_decorated_on_trait_change(clear_display):
  def foo(a='default'):
  d['a'] = a
  return a
- assert len(displayed) == 1
- w = displayed[0].children[0]
+ assert len(displayed) == 2 # display the result and the interact
+ w = displayed[1].children[0]
  check_widget(w,
  cls=widgets.Text,
  value='default',
@@ -487,7 +487,7 @@ def foo(a='default'):
  with patch.object(interaction, 'display', record_display):
  w.value = 'called'
  assert d['a'] == 'called'
- assert len(displayed) == 2
+ assert len(displayed) == 3
  assert w.value == displayed[-1]
 
 def test_call_decorated_kwargs_on_trait_change(clear_display):
@@ -498,8 +498,8 @@ def test_call_decorated_kwargs_on_trait_change(clear_display):
  def foo(a='default'):
  d['a'] = a
  return a
- assert len(displayed) == 1
- w = displayed[0].children[0]
+ assert len(displayed) == 2 # display the result and the interact
+ w = displayed[1].children[0]
  check_widget(w,
  cls=widgets.Text,
  value='kwarg',
@@ -513,7 +513,7 @@ def foo(a='default'):
  with patch.object(interaction, 'display', record_display):
  w.value = 'called'
  assert d['a'] == 'called'
- assert len(displayed) == 2
+ assert len(displayed) == 3
  assert w.value == displayed[-1]
 
 

ipywidgets/widgets/tests/utils.py

@@ -27,10 +27,10 @@ def close(self, *args, **kwargs):
 def setup_test_comm():
  _widget_attrs['_comm_default'] = getattr(Widget, '_comm_default', undefined)
  Widget._comm_default = lambda self: DummyComm()
- _widget_attrs['_ipython_display_'] = Widget._ipython_display_
+ _widget_attrs['_repr_mimebundle_'] = Widget._repr_mimebundle_
  def raise_not_implemented(*args, **kwargs):
  raise NotImplementedError()
- Widget._ipython_display_ = raise_not_implemented
+ Widget._repr_mimebundle_ = raise_not_implemented
 
 def teardown_test_comm():
  for attr, value in _widget_attrs.items():

ipywidgets/widgets/widget.py

@@ -13,7 +13,6 @@
 from traitlets import (
  HasTraits, Unicode, Dict, Instance, List, Int, Set, Bytes, observe, default, Container,
  Undefined)
-from IPython.display import display
 from json import loads as jsonloads, dumps as jsondumps
 
 from base64 import standard_b64encode
@@ -381,7 +380,6 @@ def _default_keys(self):
  _property_lock = Dict()
  _holding_sync = False
  _states_to_send = Set()
- _display_callbacks = Instance(CallbackDispatcher, ())
  _msg_callbacks = Instance(CallbackDispatcher, ())
 
  #-------------------------------------------------------------------------
@@ -449,7 +447,7 @@ def close(self):
  Widget.widgets.pop(self.model_id, None)
  self.comm.close()
  self.comm = None
- self._ipython_display_ = None
+ self._repr_mimebundle_ = None
 
  def send_state(self, key=None):
  """Sends the widget state, or a piece of it, to the front-end, if it exists.
@@ -549,21 +547,6 @@ def on_msg(self, callback, remove=False):
  True if the callback should be unregistered."""
  self._msg_callbacks.register_callback(callback, remove=remove)
 
- def on_displayed(self, callback, remove=False):
- """(Un)Register a widget displayed callback.
-
- Parameters
- ----------
- callback: method handler
- Must have a signature of::
-
- callback(widget, **kwargs)
-
- kwargs from display are passed through without modification.
- remove: bool
- True if the callback should be unregistered."""
- self._display_callbacks.register_callback(callback, remove=remove)
-
  def add_traits(self, **traits):
  """Dynamically add trait attributes to the Widget."""
  super().add_traits(**traits)
@@ -671,10 +654,6 @@ def _handle_custom_msg(self, content, buffers):
  """Called when a custom msg is received."""
  self._msg_callbacks(self, content, buffers)
 
- def _handle_displayed(self, **kwargs):
- """Called when a view has been displayed for this widget instance"""
- self._display_callbacks(self, **kwargs)
-
  @staticmethod
  def _trait_to_json(x, self):
  """Convert a trait value to json."""
@@ -685,9 +664,8 @@ def _trait_from_json(x, self):
  """Convert json values to objects."""
  return x
 
- def _ipython_display_(self, **kwargs):
- """Called when `IPython.display.display` is called on the widget."""
-
+ def _repr_mimebundle_(self, **kwargs):
+ """Called when `IPython.display.display` is called."""
  plaintext = repr(self)
  if len(plaintext) > 110:
  plaintext = plaintext[:110] + '…'
@@ -705,10 +683,7 @@ def _ipython_display_(self, **kwargs):
  'version_minor': 0,
  'model_id': self._model_id
  }
- display(data, raw=True)
-
- if self._view_name is not None:
- self._handle_displayed(**kwargs)
+ return data
 
  def _send(self, msg, buffers=None):
  """Sends a message to the model in the front-end."""

ipywidgets/widgets/widget_box.py

@@ -62,12 +62,6 @@ class Box(DOMWidget, CoreWidget):
  def __init__(self, children=(), **kwargs):
  kwargs['children'] = children
  super().__init__(**kwargs)
- self.on_displayed(Box._fire_children_displayed)
-
- def _fire_children_displayed(self):
- for child in self.children:
- child._handle_displayed()
-
 
 @register
 @doc_subst(_doc_snippets)

setup.py

@@ -108,6 +108,7 @@
 setuptools_args = {}
 install_requires = setuptools_args['install_requires'] = [
  'ipykernel>=4.5.1',
+ 'ipython>=6.1.0', # to use _repr_mimebundle
  'traitlets>=4.3.1',
  # Requiring nbformat to specify bugfix version which is not required by
  # notebook.
@@ -120,7 +121,6 @@
 ]
 
 extras_require = setuptools_args['extras_require'] = {
- '': ['ipython>=4.0.0'],
  'test': ['pytest>=3.6.0', 'pytest-cov'],
 }