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#------------------------------------------------------------------------------
# Copyright (c) 2013-2025, 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 which demonstrates linear relational constraints.
This example shows how one may define a constraint as a linear relation
of some other constraint. In this example, the horizontal position and
width of a `PushButton` depends up the width of the `Container`, and the
vertical position of another `PushButton` depends upon the width of the
other `PushButton`.
This is a contrieved example, but serves to demonstrate the feature.
<< autodoc-me >>
"""
from enaml.widgets.api import Window, Container, PushButton
enamldef Main(Window):
Container:
constraints = [
# Pin the first push button to the top contents anchor.
pb1.top == contents_top,
# Relate the left side of the push button to the width
# of the container.
pb1.left == 0.3 * width,
# Relate the width of the push button to the width of
# the container
pb1.width == 0.5 * width,
# Pin the second push button to the left contents anchor.
pb2.left == contents_left,
# Relate the top of the push button to width of the first
# push button.
pb2.top == 0.3 * pb1.width + 10
]
PushButton: pb1:
text = 'Horizontal'
PushButton: pb2:
text = 'Long Name Foo'
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