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"""StringWidget class.
Represents a unicode string using a widget.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2013, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from .widget import DOMWidget, CallbackDispatcher
from IPython.utils.traitlets import Unicode, Bool
#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
class _StringWidget(DOMWidget):
value = Unicode(help="String value", sync=True)
disabled = Bool(False, help="Enable or disable user changes", sync=True)
description = Unicode(help="Description of the value this widget represents", sync=True)
class HTMLWidget(_StringWidget):
_view_name = Unicode('HTMLView', sync=True)
class LatexWidget(_StringWidget):
_view_name = Unicode('LatexView', sync=True)
class TextareaWidget(_StringWidget):
_view_name = Unicode('TextareaView', sync=True)
def scroll_to_bottom(self):
self.send({"method": "scroll_to_bottom"})
class TextWidget(_StringWidget):
_view_name = Unicode('TextView', sync=True)
def __init__(self, **kwargs):
super(TextWidget, self).__init__(**kwargs)
self._submission_callbacks = CallbackDispatcher()
self.on_msg(self._handle_string_msg)
def _handle_string_msg(self, _, content):
"""Handle a msg from the front-end.
Parameters
----------
content: dict
Content of the msg."""
if content.get('event', '') == 'submit':
self._submission_callbacks(self)
def on_submit(self, callback, remove=False):
"""(Un)Register a callback to handle text submission.
Triggered when the user clicks enter.
Parameters
----------
callback: callable
Will be called with exactly one argument: the Widget instance
remove: bool (optional)
Whether to unregister the callback"""
self._submission_callbacks.register_callback(callback, remove=remove)
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