Add the Event.visibility field

This shows if the event is visible to anyone or just people who are invited.

The calendar view already respects this flag.

calsocial/forms.py

@@ -26,6 +26,8 @@ from wtforms.ext.dateutil.fields import DateTimeField
 from wtforms.validators import DataRequired, Email, StopValidation, ValidationError
 from wtforms.widgets import TextArea
 
+from calsocial.models import EventVisibility, EVENT_VISIBILITY_TRANSLATIONS
+
 
 class UsernameAvailable(object):  # pylint: disable=too-few-public-methods
     """Checks if a username is available
@@ -169,6 +171,36 @@ class TimezoneField(SelectField):
             yield (value, label, value == self.data)
 
 
+class EnumField(SelectField):
+    def __init__(self, enum_type, translations, *args, **kwargs):
+        kwargs.update({'choices': [(value, None) for value in enum_type]})
+        self.data = None
+        self.enum_type = enum_type
+        self.translations = translations
+        SelectField.__init__(self, *args, **kwargs)
+
+    def process_formdata(self, valuelist):
+        if not valuelist:
+            self.data = None
+
+            return
+
+        try:
+            self.data = self.enum_type[valuelist[0]]
+        except KeyError:
+            raise ValueError('Unknown value')
+
+    def iter_choices(self):
+        for value in self.enum_type:
+            label = self.translations[value] if self.translations else value.name
+
+            yield (
+                value.name,
+                self.gettext(self.translations[value]),
+                value == self.data
+            )
+
+
 class EventForm(FlaskForm):
     """Form for event creation/editing
     """
@@ -179,6 +211,7 @@ class EventForm(FlaskForm):
     end_time = DateTimeField(_('End time'), validators=[DataRequired()])
     all_day = BooleanField(_('All day'))
     description = StringField(_('Description'), widget=TextArea())
+    visibility = EnumField(EventVisibility, EVENT_VISIBILITY_TRANSLATIONS, label=_('Visibility'))
 
     def populate_obj(self, obj):
         """Populate ``obj`` with event data