Source code for pyface.fields.i_editable_field
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#
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# license included in LICENSE.txt and may be redistributed only under
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""" The editable field interface. """
from traits.api import HasTraits
from .i_field import IField
[docs]class IEditableField(IField):
""" The editable field interface.
A editable field is a widget that displays a user-editable value.
"""
[docs]class MEditableField(HasTraits):
"""The editable field mix-in.
Classes which use this mixin should implement _observe_control_value to
connect a toolkit handler that calls _update_value.
"""
# ------------------------------------------------------------------------
# IWidget interface
# ------------------------------------------------------------------------
def _add_event_listeners(self):
""" Set up toolkit-specific bindings for events """
super()._add_event_listeners()
self._observe_control_value()
def _remove_event_listeners(self):
""" Remove toolkit-specific bindings for events """
self._observe_control_value(remove=True)
super()._remove_event_listeners()
# ------------------------------------------------------------------------
# Private interface
# ------------------------------------------------------------------------
def _update_value(self, value):
""" Handle a change to the value from user interaction
This is a method suitable for calling from a toolkit event handler.
"""
self.value = self._get_control_value()
# Toolkit control interface ---------------------------------------------
def _observe_control_value(self, remove=False):
""" Toolkit specific method to change the control value observer. """
raise NotImplementedError()