py-traitsui: add new package (#15744)

var/spack/repos/builtin/packages/py-traitsui/package.py

+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+
+class PyTraitsui(PythonPackage):
+    """The TraitsUI project contains a toolkit-independent GUI abstraction
+    layer, which is used to support the "visualization" features of the Traits
+    package. Thus, you can write model in terms of the Traits API and specify a
+    GUI in terms of the primitives supplied by TraitsUI (views, items, editors,
+    etc.), and let TraitsUI and your selected toolkit and back-end take care of
+    the details of displaying them."""
+
+    homepage = "https://docs.enthought.com/traitsui"
+    url      = "https://pypi.io/packages/source/t/traitsui/traitsui-6.1.3.tar.gz"
+
+    version('6.1.3', sha256='48381763b181efc58eaf288431d1d92d028d0d97dfdd33eba7809aae8aef814f')
+
+    variant('backend', default='pyqt5', description='Default backend',
+            values=('wx', 'pyqt', 'pyqt5', 'pyside'), multi=False)
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-traits', type=('build', 'run'))
+    depends_on('py-pyface@6.0.0:', type=('build', 'run'))
+    depends_on('py-six', type=('build', 'run'))
+
+    # Backends
+    depends_on('py-wxpython@2.8.10:', when='backend=wx', type=('build', 'run'))
+    depends_on('py-numpy', when='backend=wx', type=('build', 'run'))
+    depends_on('py-pyqt4@4.10:', when='backend=pyqt', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyqt', type=('build', 'run'))
+    depends_on('py-pyqt5@5:', when='backend=pyqt5', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyqt5', type=('build', 'run'))
+    depends_on('py-pyside@1.2:', when='backend=pyside', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyside', type=('build', 'run'))