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"""StringWidget class.
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Represents a unicode string using a widget.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, the IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from .widget import DOMWidget, CallbackDispatcher
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from IPython.utils.traitlets import Unicode, Bool
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class _StringWidget(DOMWidget):
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value = Unicode(help="String value", sync=True)
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disabled = Bool(False, help="Enable or disable user changes", sync=True)
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description = Unicode(help="Description of the value this widget represents", sync=True)
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placeholder = Unicode("", help="Placeholder text to display when nothing has been typed", sync=True)
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class HTMLWidget(_StringWidget):
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_view_name = Unicode('HTMLView', sync=True)
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class LatexWidget(_StringWidget):
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_view_name = Unicode('LatexView', sync=True)
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class TextareaWidget(_StringWidget):
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_view_name = Unicode('TextareaView', sync=True)
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def scroll_to_bottom(self):
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self.send({"method": "scroll_to_bottom"})
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class TextWidget(_StringWidget):
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_view_name = Unicode('TextView', sync=True)
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def __init__(self, **kwargs):
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super(TextWidget, self).__init__(**kwargs)
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self._submission_callbacks = CallbackDispatcher()
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self.on_msg(self._handle_string_msg)
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def _handle_string_msg(self, _, content):
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"""Handle a msg from the front-end.
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Parameters
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----------
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content: dict
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Content of the msg."""
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if content.get('event', '') == 'submit':
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self._submission_callbacks(self)
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def on_submit(self, callback, remove=False):
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"""(Un)Register a callback to handle text submission.
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Triggered when the user clicks enter.
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Parameters
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----------
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callback: callable
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Will be called with exactly one argument: the Widget instance
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remove: bool (optional)
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Whether to unregister the callback"""
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self._submission_callbacks.register_callback(callback, remove=remove)
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