Allow to cancel subevents by date range

src/pretix/control/forms/orders.py

@@ -586,7 +586,21 @@ class EventCancelForm(forms.Form):
     all_subevents = forms.BooleanField(
         label=_('Cancel all dates'),
         initial=False,
-        required=False
+        required=False,
+    )
+    subevents_from = forms.SplitDateTimeField(
+        widget=SplitDateTimePickerWidget(attrs={
+            'data-inverse-dependency': '#id_all_subevents',
+        }),
+        label=pgettext_lazy('subevent', 'All dates starting at or after'),
+        required=False,
+    )
+    subevents_to = forms.SplitDateTimeField(
+        widget=SplitDateTimePickerWidget(attrs={
+            'data-inverse-dependency': '#id_all_subevents',
+        }),
+        label=pgettext_lazy('subevent', 'All dates starting before'),
+        required=False,
     )
     auto_refund = forms.BooleanField(
         label=_('Automatically refund money if possible'),
@@ -731,6 +745,7 @@ class EventCancelForm(forms.Form):
             self.fields['subevent'].queryset = self.event.subevents.all()
             self.fields['subevent'].widget = Select2(
                 attrs={
+                    'data-inverse-dependency': '#id_all_subevents',
                     'data-model-select2': 'event',
                     'data-select2-url': reverse('control:event.subevents.select2', kwargs={
                         'event': self.event.slug,
@@ -747,6 +762,12 @@ class EventCancelForm(forms.Form):
 
     def clean(self):
         d = super().clean()
-        if self.event.has_subevents and not d['subevent'] and not d['all_subevents']:
+        if d.get('subevent') and d.get('subevents_from'):
+            raise ValidationError(pgettext_lazy('subevent', 'Please either select a specific date or a date range, not both.'))
+        if d.get('all_subevents') and d.get('subevent_from'):
+            raise ValidationError(pgettext_lazy('subevent', 'Please either select all subevents or a date range, not both.'))
+        if bool(d.get('subevents_from')) != bool(d.get('subevents_to')):
+            raise ValidationError(pgettext_lazy('subevent', 'If you set a date range, please set both a start and an end.'))
+        if self.event.has_subevents and not d['subevent'] and not d['all_subevents'] and not d.get('subevents_from'):
             raise ValidationError(_('Please confirm that you want to cancel ALL dates in this event series.'))
         return d

src/pretix/control/templates/pretixcontrol/orders/cancel.html

@@ -27,8 +27,10 @@
         {% if request.event.has_subevents %}
             <fieldset>
                 <legend>{% trans "Select date" context "subevents" %}</legend>
-                {% bootstrap_field form.subevent layout="control" %}
                 {% bootstrap_field form.all_subevents layout="control" %}
+                {% bootstrap_field form.subevent layout="control" %}
+                {% bootstrap_field form.subevents_from layout="control" %}
+                {% bootstrap_field form.subevents_to layout="control" %}
             </fieldset>
         {% endif %}
         <fieldset>

src/pretix/control/views/orders.py

@@ -2074,6 +2074,8 @@ class EventCancel(EventPermissionRequiredMixin, AsyncAction, FormView):
         return self.do(
             self.request.event.pk,
             subevent=form.cleaned_data['subevent'].pk if form.cleaned_data.get('subevent') else None,
+            subevents_from=form.cleaned_data.get('subevents_from'),
+            subevents_to=form.cleaned_data.get('subevents_to'),
             auto_refund=form.cleaned_data.get('auto_refund'),
             manual_refund=form.cleaned_data.get('manual_refund'),
             refund_as_giftcard=form.cleaned_data.get('refund_as_giftcard'),