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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" The combo field interface. """
from traits.api import Callable, HasTraits, Enum, List
from pyface.fields.i_editable_field import IEditableField
class IComboField(IEditableField):
""" The combo field interface.
This is for comboboxes holding a list of values.
"""
#: The current value of the combobox.
value = Enum(values="values")
#: The list of available values for the combobox.
values = List()
#: Callable that converts a value to text plus an optional icon.
#: Should return either a uncode string or a tuple of image resource
#: and string.
formatter = Callable(str, allow_none=False)
class MComboField(HasTraits):
#: The current text value of the combobox.
value = Enum(values="values")
#: The list of available values for the combobox.
values = List(minlen=1)
#: Callable that converts a value to text plus an optional icon.
#: Should return either a uncode string or a tuple of image resource
#: and string.
formatter = Callable(str, allow_none=False)
# ------------------------------------------------------------------------
# object interface
# ------------------------------------------------------------------------
def __init__(self, values, **traits):
value = traits.pop("value", values[0])
traits["values"] = values
super().__init__(**traits)
self.value = value
# ------------------------------------------------------------------------
# Private interface
# ------------------------------------------------------------------------
def _initialize_control(self):
super()._initialize_control()
self._set_control_values(self.values)
def _add_event_listeners(self):
""" Set up toolkit-specific bindings for events """
super()._add_event_listeners()
self.observe(
self._values_updated, "values.items,formatter", dispatch="ui"
)
def _remove_event_listeners(self):
""" Remove toolkit-specific bindings for events """
self.observe(
self._values_updated,
"values.items,formatter",
dispatch="ui",
remove=True,
)
super()._remove_event_listeners()
# Toolkit control interface ---------------------------------------------
def _get_control_text_values(self):
""" Toolkit specific method to get the control's text values. """
raise NotImplementedError()
def _set_control_values(self, values):
""" Toolkit specific method to set the control's values. """
raise NotImplementedError()
# Trait change handlers --------------------------------------------------
def _values_updated(self, event):
if self.control is not None:
self._set_control_values(self.values)
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