Conditional Example¶

#------------------------------------------------------------------------------
# Copyright (c) 2013, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#------------------------------------------------------------------------------
""" An example of using Conditional to generate the views.

This example shows how Conditional can be used to generate views for
objects which are not known until runtime.

<< autodoc-me >>
"""
import random

from enaml.core.api import Conditional, Looper
from enaml.widgets.api import (
    Window, Container, Field, PushButton, CheckBox, Separator, ScrollArea
)


class Foo(object): pass
class Bar(object): pass
class Baz(object): pass


enamldef FooView(Container):
    attr model: Foo
    PushButton: text = str(model)
    PushButton: text = str(model)
    PushButton: text = str(model)


enamldef BarView(Container):
    attr model: Bar
    Field: text = str(model)
    Field: text = str(model)
    Field: text = str(model)


enamldef BazView(Container):
    attr model: Baz
    CheckBox: text = str(model)
    CheckBox: text = str(model)
    CheckBox: text = str(model)


CLASSES = [Foo, Bar, Baz]
def generate(n):
    return [random.choice(CLASSES)() for _ in xrange(n)]


enamldef Main(Window): main:
    attr models = generate(5)
    Container:
        CheckBox: show_bar:
            text = 'Show Bar Views'
            checked = True
        PushButton:
            text = 'Regenerate Models'
            clicked :: main.models = generate(random.randint(1, 10))
        ScrollArea:
            Container:
                Looper:
                    iterable << models
                    Conditional:
                        condition = isinstance(loop_item, Foo)
                        FooView:
                            model = loop_item
                    Conditional:
                        condition << isinstance(loop_item, Bar) and show_bar.checked
                        BarView:
                            model = loop_item
                    Conditional:
                        condition = isinstance(loop_item, Baz)
                        BazView:
                            model = loop_item
                    Conditional:
                        condition << (
                            (loop_index != len(main.models) - 1) and
                            (show_bar.checked if isinstance(loop_item, Bar) else True)
                        )
                        Separator:
                            orientation = 'horizontal'