#------------------------------------------------------------------------------
# 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 the manual specification of a `vbox`.

This example demonstrates how one would manually define the constraints
for a `vbox` style layout. In fact, the `vbox` layout helper generates
the primitive constraints in a fashion very similar to this example.
The intent of this example is to demonstrate that all of the layout
helper functions can be distilled down to a list of primitive
constraints.

<< autodoc-me >>
"""
from enaml.widgets.api import Window, Container, PushButton


enamldef Main(Window):
    Container:
        constraints = [
            # Vertical Constraints
            contents_top == pb1.top,
            pb1.bottom + 10 == pb2.top,
            pb2.bottom + 10 == pb3.top,
            pb3.bottom == contents_bottom,
            # Horizontal Constraints
            (contents_left == pb1.left) | 'medium',
            (contents_left == pb2.left) | 'medium',
            (contents_left == pb3.left) | 'medium',
            (pb1.right == contents_right) | 'medium',
            (pb2.right == contents_right) | 'medium',
            (pb3.right == contents_right) | 'medium',
        ]
        PushButton: pb1:
            text = 'Spam'
        PushButton: pb2:
            text = 'Long Name Foo'
        PushButton: pb3:
            text = 'Bar'

