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Added event for widget construction

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Jonathan Frederic 2013-12-20 15:24:14 -08:00 committed by Jonathan Frederic
parent ea27ae599b
commit f2fefe20ff
1 changed files with 18 additions and 2 deletions
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20
IPython/html/widgets/widget.py
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@ -32,10 +32,24 @@ from IPython.utils.py3compat import string_types
#-----------------------------------------------------------------------------
class Widget(LoggingConfigurable):
# Shared declarations
# Shared declarations (Class level)
_keys = []
widget_construction_callback = None
def on_widget_constructed(callback):
"""Class method, registers a callback to be called when a widget is
constructed. The callback must have the following signature:
callback(widget)"""
Widget.widget_construction_callback = callback
def _handle_widget_constructed(widget):
"""Class method, called when a widget is constructed."""
if Widget.widget_construction_callback is not None and callable(Widget.widget_construction_callback):
Widget.widget_construction_callback(widget)
# Public declarations
# Public declarations (Instance level)
target_name = Unicode('widget', help="""Name of the backbone model
registered in the frontend to create and sync this widget with.""")
default_view_name = Unicode(help="""Default view registered in the frontend
@ -83,6 +97,8 @@ class Widget(LoggingConfigurable):
# Register after init to allow default values to be specified
self.on_trait_change(self._handle_property_changed, self.keys)
Widget._handle_widget_constructed(self)
def __del__(self):