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"""Selection classes.
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Represents an enumeration 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 collections import OrderedDict
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from threading import Lock
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from .widget import DOMWidget, register
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from IPython.utils.traitlets import (
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Unicode, Bool, Any, Dict, TraitError, CaselessStrEnum, Tuple, List
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)
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from IPython.utils.py3compat import unicode_type
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from .deprecated import DeprecatedClass
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class _Selection(DOMWidget):
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"""Base class for Selection widgets
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``options`` can be specified as a list or dict. If given as a list,
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it will be transformed to a dict of the form ``{str(value):value}``.
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When programmatically setting the value, a reverse lookup is performed
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among the options to set the value of ``selected_label`` accordingly. The
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reverse lookup uses the equality operator by default, but an other
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predicate may be provided via the ``equals`` argument. For example, when
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dealing with numpy arrays, one may set equals=np.array_equal.
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"""
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value = Any(help="Selected value")
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selected_label = Unicode(help="The label of the selected value", sync=True)
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options = Any(help="""List of (key, value) tuples or dict of values that the
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user can select.
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The keys of this list are the strings that will be displayed in the UI,
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representing the actual Python choices.
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The keys of this list are also available as _options_labels.
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""")
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_options_dict = Dict()
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_options_labels = Tuple(sync=True)
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_options_values = Tuple()
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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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def __init__(self, *args, **kwargs):
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self.value_lock = Lock()
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self.options_lock = Lock()
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self.equals = kwargs.pop('equals', lambda x, y: x == y)
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self.on_trait_change(self._options_readonly_changed, ['_options_dict', '_options_labels', '_options_values', '_options'])
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if 'options' in kwargs:
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self.options = kwargs.pop('options')
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DOMWidget.__init__(self, *args, **kwargs)
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self._value_in_options()
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def _make_options(self, x):
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# If x is a dict, convert it to list format.
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if isinstance(x, (OrderedDict, dict)):
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return [(k, v) for k, v in x.items()]
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# Make sure x is a list or tuple.
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if not isinstance(x, (list, tuple)):
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raise ValueError('x')
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# If x is an ordinary list, use the option values as names.
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for y in x:
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if not isinstance(y, (list, tuple)) or len(y) < 2:
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return [(i, i) for i in x]
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# Value is already in the correct format.
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return x
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def _options_changed(self, name, old, new):
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"""Handles when the options tuple has been changed.
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Setting options implies setting option labels from the keys of the dict.
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"""
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if self.options_lock.acquire(False):
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try:
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self.options = new
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options = self._make_options(new)
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self._options_dict = {i[0]: i[1] for i in options}
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self._options_labels = [i[0] for i in options]
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self._options_values = [i[1] for i in options]
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self._value_in_options()
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finally:
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self.options_lock.release()
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def _value_in_options(self):
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# ensure that the chosen value is one of the choices
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if self._options_values:
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if self.value not in self._options_values:
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self.value = next(iter(self._options_values))
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def _options_readonly_changed(self, name, old, new):
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if not self.options_lock.locked():
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raise TraitError("`.%s` is a read-only trait. Use the `.options` tuple instead." % name)
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def _value_changed(self, name, old, new):
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"""Called when value has been changed"""
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if self.value_lock.acquire(False):
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try:
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# Reverse dictionary lookup for the value name
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for k, v in self._options_dict.items():
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if self.equals(new, v):
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# set the selected value name
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self.selected_label = k
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return
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# undo the change, and raise KeyError
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self.value = old
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raise KeyError(new)
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finally:
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self.value_lock.release()
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def _selected_label_changed(self, name, old, new):
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"""Called when the value name has been changed (typically by the frontend)."""
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if self.value_lock.acquire(False):
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try:
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self.value = self._options_dict[new]
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finally:
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self.value_lock.release()
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class _MultipleSelection(_Selection):
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"""Base class for MultipleSelection widgets.
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As with ``_Selection``, ``options`` can be specified as a list or dict. If
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given as a list, it will be transformed to a dict of the form
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``{str(value): value}``.
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Despite their names, ``value`` (and ``selected_label``) will be tuples, even
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if only a single option is selected.
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"""
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value = Tuple(help="Selected values")
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selected_labels = Tuple(help="The labels of the selected options",
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sync=True)
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@property
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def selected_label(self):
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raise AttributeError(
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"Does not support selected_label, use selected_labels")
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def _value_in_options(self):
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# ensure that the chosen value is one of the choices
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if self.options:
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old_value = self.value or []
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new_value = []
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for value in old_value:
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if value in self._options_dict.values():
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new_value.append(value)
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if new_value:
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self.value = new_value
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else:
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self.value = [next(iter(self._options_dict.values()))]
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def _value_changed(self, name, old, new):
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"""Called when value has been changed"""
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if self.value_lock.acquire(False):
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try:
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self.selected_labels = [
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self._options_labels[self._options_values.index(v)]
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for v in new
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]
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except:
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self.value = old
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raise KeyError(new)
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finally:
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self.value_lock.release()
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def _selected_labels_changed(self, name, old, new):
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"""Called when the selected label has been changed (typically by the
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frontend)."""
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if self.value_lock.acquire(False):
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try:
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self.value = [self._options_dict[name] for name in new]
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finally:
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self.value_lock.release()
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@register('IPython.ToggleButtons')
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class ToggleButtons(_Selection):
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"""Group of toggle buttons that represent an enumeration. Only one toggle
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button can be toggled at any point in time."""
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_view_name = Unicode('ToggleButtonsView', sync=True)
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tooltips = List(Unicode(), sync=True)
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icons = List(Unicode(), sync=True)
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button_style = CaselessStrEnum(
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values=['primary', 'success', 'info', 'warning', 'danger', ''],
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default_value='', allow_none=True, sync=True, help="""Use a
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predefined styling for the buttons.""")
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@register('IPython.Dropdown')
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class Dropdown(_Selection):
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"""Allows you to select a single item from a dropdown."""
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_view_name = Unicode('DropdownView', sync=True)
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button_style = CaselessStrEnum(
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values=['primary', 'success', 'info', 'warning', 'danger', ''],
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default_value='', allow_none=True, sync=True, help="""Use a
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predefined styling for the buttons.""")
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@register('IPython.RadioButtons')
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class RadioButtons(_Selection):
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"""Group of radio buttons that represent an enumeration. Only one radio
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button can be toggled at any point in time."""
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_view_name = Unicode('RadioButtonsView', sync=True)
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@register('IPython.Select')
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class Select(_Selection):
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"""Listbox that only allows one item to be selected at any given time."""
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_view_name = Unicode('SelectView', sync=True)
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@register('IPython.SelectMultiple')
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class SelectMultiple(_MultipleSelection):
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"""Listbox that allows many items to be selected at any given time.
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Despite their names, inherited from ``_Selection``, the currently chosen
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option values, ``value``, or their labels, ``selected_labels`` must both be
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updated with a list-like object."""
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_view_name = Unicode('SelectMultipleView', sync=True)
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# Remove in IPython 4.0
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ToggleButtonsWidget = DeprecatedClass(ToggleButtons, 'ToggleButtonsWidget')
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DropdownWidget = DeprecatedClass(Dropdown, 'DropdownWidget')
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RadioButtonsWidget = DeprecatedClass(RadioButtons, 'RadioButtonsWidget')
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SelectWidget = DeprecatedClass(Select, 'SelectWidget')
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