Add cancel_allow_user_paid_adjust_fees_explanation

src/pretix/api/serializers/event.py

@@ -618,6 +618,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'cancel_allow_user_paid_keep_fees',
         'cancel_allow_user_paid_keep_percentage',
         'cancel_allow_user_paid_adjust_fees',
+        'cancel_allow_user_paid_adjust_fees_explanation',
         'cancel_allow_user_paid_refund_as_giftcard',
         'cancel_allow_user_paid_require_approval',
     ]

src/pretix/base/settings.py

@@ -966,6 +966,23 @@ DEFAULTS = {
             help_text=_("With this option enabled, your customers can choose to get a smaller refund to support you.")
         )
     },
+    'cancel_allow_user_paid_adjust_fees_explanation': {
+        'default': LazyI18nString.from_gettext(gettext_noop(
+            'However, if you want us to help keep the lights on here, please consider using the slider below to '
+            'request a smaller refund. Thank you!'
+        )),
+        'type': LazyI18nString,
+        'serializer_class': I18nField,
+        'form_class': I18nFormField,
+        'form_kwargs': dict(
+            label=_("Voluntary lower refund explanation"),
+            widget=I18nTextarea,
+            widget_kwargs={'attrs': {'rows': '2'}},
+            help_text=_("This text will be shown in between the explanation of how the refunds work and the slider "
+                        "which your customers can use to choose the amount they would like to receive. You can use it "
+                        "e.g. to explain choosing a lower refund will help your organisation.")
+        )
+    },
     'cancel_allow_user_paid_require_approval': {
         'default': 'False',
         'type': bool,

src/pretix/control/forms/event.py

@@ -572,6 +572,7 @@ class CancelSettingsForm(SettingsForm):
         'cancel_allow_user_paid_keep_fees',
         'cancel_allow_user_paid_keep_percentage',
         'cancel_allow_user_paid_adjust_fees',
+        'cancel_allow_user_paid_adjust_fees_explanation',
         'cancel_allow_user_paid_refund_as_giftcard',
         'cancel_allow_user_paid_require_approval',
     ]

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

@@ -20,7 +20,21 @@
                 {% bootstrap_field form.cancel_allow_user_paid_keep_percentage layout="control" %}
                 {% bootstrap_field form.cancel_allow_user_paid_keep_fees layout="control" %}
                 {% bootstrap_field form.cancel_allow_user_paid_until layout="control" %}
-                {% bootstrap_field form.cancel_allow_user_paid_adjust_fees layout="control" %}
+                <div class="form-group">
+                    <div class="col-md-9 col-md-offset-3">
+                        <div class="checkbox">
+                            <label data-toggle="collapse" data-target="#cancel_allow_user_paid_adjust_fees_explanation">
+                                {{ form.cancel_allow_user_paid_adjust_fees }} {{ form.cancel_allow_user_paid_adjust_fees.label }}
+                            </label>
+                        </div>
+                        <div class="help-block">
+                            {{ form.cancel_allow_user_paid_adjust_fees.help_text }}
+                        </div>
+                    </div>
+                </div>
+                <div id="cancel_allow_user_paid_adjust_fees_explanation" class="panel-body panel-collapse collapse {% if form.cancel_allow_user_paid_adjust_fees.value %} in {% else %} out {% endif %}">
+                    {% bootstrap_field form.cancel_allow_user_paid_adjust_fees_explanation layout="control" %}
+                </div>
                 {% bootstrap_field form.cancel_allow_user_paid_refund_as_giftcard layout="control" %}
                 {% if not gets_notification %}
                     <div class="alert alert-warning">

src/pretix/presale/templates/pretixpresale/event/order_cancel.html

@@ -3,6 +3,7 @@
 {% load money %}
 {% load eventurl %}
 {% load l10n %}
+{% load rich_text %}
 {% block title %}{% trans "Cancel order" %}{% endblock %}
 {% block content %}
     <h2>
@@ -48,7 +49,9 @@
                         If you want, you can request a full refund.
                     {% endblocktrans %}
                 {% endif %}
-                {% trans "However, if you want us to help keep the lights on here, please consider using the slider below to request a smaller refund. Thank you!" %}
+            </p>
+            <p>
+                {{ request.event.settings.cancel_allow_user_paid_adjust_fees_explanation|rich_text }}
             </p>
             <div class="cancel-fee-slider">
                 <div id="cancel-fee-keep">Enter how much we can keep:</div>