Embed fixes (#677)

* Ensure that ColumnDataChangeEvents referencing old columns are dropped

* Fixed embed functionality on Select widgets

panel/io/model.py

@@ -6,6 +6,7 @@
 import textwrap
 
 from bokeh.document import Document
+from bokeh.document.events import ColumnDataChangedEvent
 from bokeh.models import Model, Box
 from bokeh.protocol import Protocol
 
@@ -24,6 +25,14 @@ def diff(doc, binary=True, events=None):
     events = list(doc._held_events) if events is None else events
     if not events or state._hold:
         return None
+
+    # Filter ColumnDataChangedEvents which reference non-existing
+    # columns, later event will include the changes
+    fixed_events = []
+    for e in events:
+        if isinstance(e.hint, ColumnDataChangedEvent) and e.hint.cols is not None:
+            e.hint.cols = None
+        fixed_events.append(e)
     msg = Protocol("1.0").create("PATCH-DOC", events, use_buffers=binary)
     doc._held_events = [e for e in doc._held_events if e not in events]
     return msg

panel/widgets/select.py

@@ -109,6 +109,8 @@ class MultiSelect(Select):
 
     _widget_type = _BkMultiSelect
 
+    _supports_embed = False
+
     def _process_param_change(self, msg):
         msg = super(Select, self)._process_param_change(msg)
         labels, values = self.labels, self.values
@@ -132,6 +134,7 @@ def _process_property_change(self, msg):
         return msg
 
 
+
 class AutocompleteInput(Widget):
 
     options = param.List(default=[])
@@ -145,8 +148,11 @@ class AutocompleteInput(Widget):
     _rename = {'name': 'title', 'options': 'completions'}
 
 
+
 class _RadioGroupBase(Select):
 
+    _supports_embed = False
+
     __abstract = True
 
     def _process_param_change(self, msg):
@@ -179,27 +185,40 @@ def _process_property_change(self, msg):
                 msg['value'] = list(self.values)[index]
         return msg
 
+    def _get_embed_state(self, root, max_opts=3):
+        return (self, self._models[root.ref['id']][0], self.values,
+                lambda x: x.active, 'active', 'cb_obj.active')
+
+
 
 class RadioButtonGroup(_RadioGroupBase, _ButtonBase):
 
     _widget_type = _BkRadioButtonGroup
 
     _rename = {'name': 'title'}
 
+    _supports_embed = True
+
+
 
 class RadioBoxGroup(_RadioGroupBase):
 
     inline = param.Boolean(default=False, doc="""
         Whether the items be arrange vertically (``False``) or
         horizontally in-line (``True``).""")
 
+    _supports_embed = True
+
     _widget_type = _BkRadioBoxGroup
 
 
+
 class _CheckGroupBase(Select):
 
     value = param.List(default=[])
 
+    _supports_embed = False
+
     __abstract = True
 
     def _process_param_change(self, msg):
@@ -223,13 +242,15 @@ def _process_property_change(self, msg):
         return msg
 
 
+
 class CheckButtonGroup(_CheckGroupBase, _ButtonBase):
 
     _widget_type = _BkCheckboxButtonGroup
 
     _rename = {'name': 'title'}
 
 
+
 class CheckBoxGroup(_CheckGroupBase):
 
     inline = param.Boolean(default=False, doc="""
@@ -239,6 +260,7 @@ class CheckBoxGroup(_CheckGroupBase):
     _widget_type = _BkCheckboxGroup
 
 
+
 class ToggleGroup(Select):
     """This class is a factory of ToggleGroup widgets.
 
@@ -281,6 +303,7 @@ def __new__(cls, widget_type='button', behavior='check', **params):
                 return RadioBoxGroup(**params)
 
 
+
 class CrossSelector(CompositeWidget, MultiSelect):
     """
     A composite widget which allows selecting from a list of items