1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
# (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 editable field interface. """
from traits.api import HasTraits
from .i_field import IField
class IEditableField(IField):
""" The editable field interface.
A editable field is a widget that displays a user-editable value.
"""
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()
|
