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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 spin field interface. """
from traits.api import Bool, HasTraits, Int, Property, Range, Tuple
from pyface.fields.i_editable_field import IEditableField
class ISpinField(IEditableField):
""" The spin field interface.
This is for spinners holding integer values.
"""
#: The current value of the spinner
value = Range(low="minimum", high="maximum")
#: The bounds of the spinner
bounds = Tuple(Int, Int)
#: The minimum value
minimum = Property(Int, observe="bounds")
#: The maximum value
maximum = Property(Int, observe="bounds")
#: Whether the values wrap around at maximum and minimum.
wrap = Bool()
class MSpinField(HasTraits):
#: The current value of the spinner
value = Range(low="minimum", high="maximum")
#: The bounds for the spinner
bounds = Tuple(Int, Int)
#: The minimum value for the spinner
minimum = Property(Int, observe="bounds")
#: The maximum value for the spinner
maximum = Property(Int, observe="bounds")
#: Whether the values wrap around at maximum and minimum.
wrap = Bool()
# ------------------------------------------------------------------------
# object interface
# ------------------------------------------------------------------------
def __init__(self, **traits):
value = traits.pop("value", None)
if "bounds" in traits:
traits["value"] = traits["bounds"][0]
super().__init__(**traits)
if value is not None:
self.value = value
# ------------------------------------------------------------------------
# Private interface
# ------------------------------------------------------------------------
def _initialize_control(self):
super()._initialize_control()
self._set_control_bounds(self.bounds)
self._set_control_value(self.value)
self._set_control_wrap(self.wrap)
def _add_event_listeners(self):
""" Set up toolkit-specific bindings for events """
super()._add_event_listeners()
self.observe(self._bounds_updated, "bounds", dispatch="ui")
self.observe(self._wrap_updated, "wrap", dispatch="ui")
if self.control is not None:
self._observe_control_value()
def _remove_event_listeners(self):
""" Remove toolkit-specific bindings for events """
self.observe(
self._bounds_updated, "bounds", dispatch="ui", remove=True
)
self.observe(
self._wrap_updated, "wrap", dispatch="ui", remove=True
)
super()._remove_event_listeners()
# Toolkit control interface ---------------------------------------------
def _get_control_bounds(self):
""" Toolkit specific method to get the control's bounds. """
raise NotImplementedError()
def _set_control_bounds(self, bounds):
""" Toolkit specific method to set the control's bounds. """
raise NotImplementedError()
def _get_control_wrap(self):
""" Toolkit specific method to get whether the control wraps. """
raise NotImplementedError
def _set_control_wrap(self, wrap):
""" Toolkit specific method to set whether the control wraps. """
raise NotImplementedError
# Trait property handlers -----------------------------------------------
def _get_minimum(self):
return self.bounds[0]
def _set_minimum(self, value):
if value > self.maximum:
self.bounds = (value, value)
else:
self.bounds = (value, self.maximum)
if value > self.value:
self.value = value
def _get_maximum(self):
return self.bounds[1]
def _set_maximum(self, value):
if value < self.minimum:
self.bounds = (value, value)
else:
self.bounds = (self.minimum, value)
if value < self.value:
self.value = value
# Trait defaults --------------------------------------------------------
def _value_default(self):
return self.bounds[0]
# Trait change handlers --------------------------------------------------
def _bounds_updated(self, event):
if self.control is not None:
self._set_control_bounds(self.bounds)
def _wrap_updated(self, event):
if self.control is not None:
self._set_control_wrap(event.new)
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