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"""String class.
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Represents a unicode string using a widget.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from .widget import DOMWidget, CallbackDispatcher, register
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from IPython.utils.traitlets import Unicode, Bool
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from .deprecated import DeprecatedClass
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class _String(DOMWidget):
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"""Base class used to create widgets that represent a string."""
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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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def __init__(self, value=None, **kwargs):
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if value is not None:
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kwargs['value'] = value
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super(_String, self).__init__(**kwargs)
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@register('IPython.HTML')
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class HTML(_String):
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"""Renders the string `value` as HTML."""
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_view_name = Unicode('HTMLView', sync=True)
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@register('IPython.Latex')
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class Latex(_String):
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"""Renders math inside the string `value` as Latex (requires $ $ or $$ $$
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and similar latex tags)."""
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_view_name = Unicode('LatexView', sync=True)
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@register('IPython.Textarea')
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class Textarea(_String):
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"""Multiline text area widget."""
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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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@register('IPython.Text')
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class Text(_String):
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"""Single line textbox widget."""
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_view_name = Unicode('TextView', sync=True)
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def __init__(self, *args, **kwargs):
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super(Text, self).__init__(*args, **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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# Remove in IPython 4.0
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HTMLWidget = DeprecatedClass(HTML, 'HTMLWidget')
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LatexWidget = DeprecatedClass(Latex, 'LatexWidget')
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TextareaWidget = DeprecatedClass(Textarea, 'TextareaWidget')
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TextWidget = DeprecatedClass(Text, 'TextWidget')
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