Use _repr_mimebundle_ instead of _ipython_display

Fixes jupyter-widgets#1811

ipywidgets/widgets/interaction.py

@@ -228,8 +228,7 @@ 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/widget.py

@@ -20,7 +20,6 @@
     HasTraits, Unicode, Dict, Instance, List, Int, Set, Bytes, observe, default, Container,
     Undefined)
 from ipython_genutils.py3compat import string_types, PY3
-from IPython.display import display
 from json import loads as jsonloads, dumps as jsondumps
 
 from base64 import standard_b64encode
@@ -400,7 +399,6 @@ def _default_keys(self):
     _property_lock = Dict()
     _holding_sync = False
     _states_to_send = Set()
-    _display_callbacks = Instance(CallbackDispatcher, ())
     _msg_callbacks = Instance(CallbackDispatcher, ())
 
     #-------------------------------------------------------------------------
@@ -468,7 +466,7 @@ 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.
@@ -570,21 +568,6 @@ 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(Widget, self).add_traits(**traits)
@@ -692,10 +675,6 @@ 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."""
@@ -706,9 +685,8 @@ 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] + '…'
@@ -726,10 +704,7 @@ 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

@@ -62,11 +62,6 @@ class Box(DOMWidget, CoreWidget):
     def __init__(self, children=(), **kwargs):
         kwargs['children'] = children
         super(Box, self).__init__(**kwargs)
-        self.on_displayed(Box._fire_children_displayed)
-
-    def _fire_children_displayed(self):
-        for child in self.children:
-            child._handle_displayed()
 
 
 @register