New pretixdroid configuration system

src/pretix/plugins/pretixdroid/forms.py

@@ -0,0 +1,23 @@
+from django import forms
+
+from pretix.plugins.pretixdroid.models import AppConfiguration
+
+
+class AppConfigurationForm(forms.ModelForm):
+    class Meta:
+        model = AppConfiguration
+        fields = ('all_items', 'items', 'subevent', 'show_info', 'allow_search')
+        widgets = {
+            'items': forms.CheckboxSelectMultiple(attrs={
+                'data-inverse-dependency': '#id_all_items'
+            }),
+        }
+
+    def __init__(self, **kwargs):
+        self.event = kwargs.pop('event')
+        super().__init__(**kwargs)
+        self.fields['items'].queryset = self.event.items.all()
+        if self.event.has_subevents:
+            self.fields['subevent'].queryset = self.event.subevents.all()
+        else:
+            del self.fields['subevent']