fix #146: Dialog forms with siblings

Add demo to show how to use dialogs in collections with siblings

testapp/forms/cafeteria.py

@@ -0,0 +1,54 @@
+from django.forms.fields import CharField, ChoiceField
+from django.forms.forms import Form
+from django.forms.widgets import RadioSelect
+from formset.collection import FormCollection
+from formset.dialog import ApplyButton, CancelButton, DialogForm
+from formset.fields import Activator
+
+
+class CoffeeForm(Form):
+    nickname = CharField()
+    flavors = Activator(
+        label="Add flavors",
+        help_text="Open the dialog to edit flavors",
+    )
+
+
+class FlavorForm(DialogForm):
+    title = "Choose a Flavor"
+    induce_open = '..coffee.flavors:active'
+    induce_close = '.cancel:active || .apply:active'
+
+    flavors = ChoiceField(
+        choices=(
+            ('caramel', "Caramel Macchiato"),
+            ('cinnamon', "Cinnamon Dolce Latte"),
+            ('hazelnut', "Turkish Hazelnut"),
+            ('vanilla', "Vanilla Latte"),
+            ('chocolate', "Chocolate Fudge"),
+            ('almonds', "Roasted Almonds"),
+            ('cream', "Irish Cream"),
+        ),
+        widget=RadioSelect,
+        required=False,
+    )
+    cancel = Activator(
+        label="Close",
+        widget=CancelButton,
+    )
+    apply = Activator(
+        label="Apply",
+        widget=ApplyButton,
+    )
+
+class CoffeeOrderCollection(FormCollection):
+    legend = "Order your coffee"
+    add_label = "Add Coffee Order"
+    min_siblings = 1
+    extra_siblings = 1
+    coffee = CoffeeForm()
+    flavor = FlavorForm()
+
+
+class CafeteriaCollection(FormCollection):
+    coffee_order = CoffeeOrderCollection()

testapp/views.py

@@ -41,6 +41,7 @@
 )
 from testapp.forms.birthdate import BirthdateBoxForm, BirthdateCalendarForm, BirthdateInputForm, BirthdatePickerForm
 from testapp.forms.booking import BookingBoxForm, BookingCalendarForm, BookingPickerForm
+from testapp.forms.cafeteria import CafeteriaCollection
 from testapp.forms.country import CountryForm
 from testapp.forms.county import CountyForm
 from testapp.forms.customer import CustomerCollection
@@ -573,6 +574,9 @@ class CompleteForm(FormMixin, forms.Form):
         template_name='testapp/form-collection-no-buttons.html',
     ), name='simplecontact'),
     path('issue', IssueCollectionView.as_view(), name='issue'),
+    path('cafeteria', DemoFormCollectionView.as_view(
+        collection_class=CafeteriaCollection,
+    ), name='simplecontact'),
     path('customer', DemoFormCollectionView.as_view(
         collection_class=CustomerCollection,
     ), name='customer'),