142 lines
4.9 KiB
Python
142 lines
4.9 KiB
Python
# Copyright (c) Jupyter Development Team.
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
"""String class.
|
|
|
|
Represents a unicode string using a widget.
|
|
"""
|
|
|
|
from .widget_description import DescriptionWidget
|
|
from .valuewidget import ValueWidget
|
|
from .widget import CallbackDispatcher, register
|
|
from .widget_core import CoreWidget
|
|
from .trait_types import TypedTuple
|
|
from traitlets import Unicode, Bool, Int
|
|
from warnings import warn
|
|
|
|
|
|
class _String(DescriptionWidget, ValueWidget, CoreWidget):
|
|
"""Base class used to create widgets that represent a string."""
|
|
|
|
value = Unicode(help="String value").tag(sync=True)
|
|
|
|
# We set a zero-width space as a default placeholder to make sure the baseline matches
|
|
# the text, not the bottom margin. See the last paragraph of
|
|
# https://www.w3.org/TR/CSS2/visudet.html#leading
|
|
placeholder = Unicode(u'\u200b', help="Placeholder text to display when nothing has been typed").tag(sync=True)
|
|
|
|
|
|
def __init__(self, value=None, **kwargs):
|
|
if value is not None:
|
|
kwargs['value'] = value
|
|
super(_String, self).__init__(**kwargs)
|
|
|
|
_model_name = Unicode('StringModel').tag(sync=True)
|
|
|
|
|
|
@register
|
|
class HTML(_String):
|
|
"""Renders the string `value` as HTML."""
|
|
_view_name = Unicode('HTMLView').tag(sync=True)
|
|
_model_name = Unicode('HTMLModel').tag(sync=True)
|
|
|
|
@register
|
|
class HTMLMath(_String):
|
|
"""Renders the string `value` as HTML, and render mathematics."""
|
|
_view_name = Unicode('HTMLMathView').tag(sync=True)
|
|
_model_name = Unicode('HTMLMathModel').tag(sync=True)
|
|
|
|
|
|
@register
|
|
class Label(_String):
|
|
"""Label widget.
|
|
|
|
It also renders math inside the string `value` as Latex (requires $ $ or
|
|
$$ $$ and similar latex tags).
|
|
"""
|
|
_view_name = Unicode('LabelView').tag(sync=True)
|
|
_model_name = Unicode('LabelModel').tag(sync=True)
|
|
|
|
|
|
@register
|
|
class Textarea(_String):
|
|
"""Multiline text area widget."""
|
|
_view_name = Unicode('TextareaView').tag(sync=True)
|
|
_model_name = Unicode('TextareaModel').tag(sync=True)
|
|
rows = Int(None, allow_none=True, help="The number of rows to display.").tag(sync=True)
|
|
disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
|
|
continuous_update = Bool(True, help="Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.").tag(sync=True)
|
|
|
|
@register
|
|
class Text(_String):
|
|
"""Single line textbox widget."""
|
|
_view_name = Unicode('TextView').tag(sync=True)
|
|
_model_name = Unicode('TextModel').tag(sync=True)
|
|
disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
|
|
continuous_update = Bool(True, help="Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.").tag(sync=True)
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(Text, self).__init__(*args, **kwargs)
|
|
self._submission_callbacks = CallbackDispatcher()
|
|
self.on_msg(self._handle_string_msg)
|
|
|
|
def _handle_string_msg(self, _, content, buffers):
|
|
"""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
|
|
"""
|
|
import warnings
|
|
warnings.warn("on_submit is deprecated. Instead, set the .continuous_update attribute to False and observe the value changing with: mywidget.observe(callback, 'value').", DeprecationWarning)
|
|
self._submission_callbacks.register_callback(callback, remove=remove)
|
|
|
|
|
|
@register
|
|
class Password(Text):
|
|
"""Single line textbox widget."""
|
|
_view_name = Unicode('PasswordView').tag(sync=True)
|
|
_model_name = Unicode('PasswordModel').tag(sync=True)
|
|
disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
|
|
|
|
def _repr_keys(self):
|
|
# Don't include password value in repr!
|
|
super_keys = super(Password, self)._repr_keys()
|
|
for key in super_keys:
|
|
if key != 'value':
|
|
yield key
|
|
|
|
|
|
@register
|
|
class Combobox(Text):
|
|
"""Single line textbox widget with a dropdown and autocompletion.
|
|
"""
|
|
_model_name = Unicode('ComboboxModel').tag(sync=True)
|
|
_view_name = Unicode('ComboboxView').tag(sync=True)
|
|
|
|
options = TypedTuple(
|
|
trait=Unicode(),
|
|
help="Dropdown options for the combobox"
|
|
).tag(sync=True)
|
|
|
|
ensure_option = Bool(
|
|
False,
|
|
help='If set, ensure value is in options. Implies continuous_update=False.'
|
|
).tag(sync=True)
|