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#------------------------------------------------------------------------------
# Copyright (c) 2014-2024,, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
""" An example of using the FocusTraversal advanced widget feature.
The FocusTraversal is an advanced widget feature for controlling the
order in which widgets receive focus during Tab and Shift+Tab keyboard
events. It enables two methods which can be implemented as declarative
Enaml functions which will compute the next/previous focus widgets on
demand.
In this example, the traversal handlers simply return the next or
previous field from a double-linked list of fields. However, there
is no restriction on how the handlers actually compute the focus
widgets.
<< autodoc-me >>
"""
from enaml.widgets.api import Window, GroupBox, Field, FocusTracker, Container, Feature
enamldef LinkField(Field):
attr next_field
attr prev_field
enamldef Main(Window):
title = 'Focus Traversal'
Container:
features = Feature.FocusTraversal
next_focus_child => (current): # triggered on Tab
return getattr(current, 'next_field', None)
previous_focus_child => (current): # triggered on Shift+Tab
return getattr(current, 'prev_field', None)
FocusTracker:
focused_widget::
print(change["value"])
GroupBox:
title = 'First Group'
LinkField: f1:
placeholder = '1'
next_field = f4
prev_field = f5
LinkField: f2:
placeholder = '5'
next_field = f7
prev_field = f6
LinkField: f3:
placeholder = '3'
next_field = f6
prev_field = f4
LinkField: f4:
placeholder = '2'
next_field = f3
prev_field = f1
GroupBox:
title = 'Second Group'
LinkField: f5:
placeholder = '7'
next_field = f1
prev_field = f7
LinkField: f6:
placeholder = '4'
next_field = f2
prev_field = f3
LinkField: f7:
placeholder = '6'
next_field = f5
prev_field = f2
|
