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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 a factory function to generate constraints.
This example shows how a function can be used as a delegate for generating
the list of layout constraints. This mode of constraint generation is useful
when the children of a container change dynamically at runtime. The factory
will be invoked automatically whenever the internal layout engine determines
that a relayout is necessary.
<< autodoc-me >>
"""
from itertools import zip_longest
from enaml.core.api import Include
from enaml.layout.api import align, grid, factory
from enaml.widgets.api import Window, Container, Form, Field, Label, SpinBox
def generate_grid(container, num_cols):
""" Generate grid constraints with given number of columns.
"""
rows = []
widgets = container.visible_widgets()
row_iters = (iter(widgets),) * num_cols
rows = list(zip_longest(*row_iters))
return [grid(*rows), align('width', *widgets)]
enamldef Main(Window):
title = 'Factory Helper'
Container:
padding = 0
Form:
Label:
text = 'Widget Count'
SpinBox: w_count:
value = 4
Label:
text = 'Column Count'
SpinBox: c_count:
value = 2
minimum = 1
maximum = 5
Container:
# The << operator is only needed for the subscription to
# the column count. The factory is automatically invoked
# whenever the number of children of the container change.
constraints << [factory(generate_grid, c_count.value)]
Include:
objects << [Field(text=str(i)) for i in range(w_count.value)]
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