add empty cart button

#161

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

@@ -15,19 +15,32 @@
             </div>
             <div class="panel-body">
                 {% include "pretixpresale/event/fragment_cart.html" with cart=cart event=request.event editable=True %}
-                <div class="cart-row row">
-                    <div class="col-md-6 col-xs-12">
-                        <em id="cart-deadline" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}">
-                            {% if cart.minutes_left > 0 %}
-                                {% blocktrans trimmed with minutes=cart.minutes_left %}
-                                    The items in your cart are reserved for you for {{ minutes }} minutes.
-                                {% endblocktrans %}
-                            {% else %}
-                                {% trans "The items in your cart are no longer reserved for you." %}
-                            {% endif %}
-                        </em>
+                <em id="cart-deadline" data-expires="{{ cart.first_expiry|date:"Y-m-d H:i:sO" }}">
+                    {% if cart.minutes_left > 0 %}
+                        {% blocktrans trimmed with minutes=cart.minutes_left %}
+                            The items in your cart are reserved for you for {{ minutes }} minutes.
+                        {% endblocktrans %}
+                    {% else %}
+                        {% trans "The items in your cart are no longer reserved for you." %}
+                    {% endif %}
+                </em>
+                <div class="row checkout-button-row">
+                    <div class="col-md-4 col-xs-12">
+                        <form method="post" data-asynctask action="{% eventurl request.event "presale:event.cart.remove.all" %}" >
+                            {% csrf_token %}
+                            {% for line in cart.positions %}
+                                {% if line.variation %}
+                                    <input type="hidden" name="variation_{{ line.item.id }}_{{ line.variation.id }}" value="{{ line.count }}" />
+                                    <input type="hidden" name="price_{{ line.item.id }}_{{ line.variation.id }}" value="{{ line.price }}" />
+                                {% else %}
+                                    <input type="hidden" name="item_{{ line.item.id }}" value="{{ line.count }}" />
+                                    <input type="hidden" name="price_{{ line.item.id }}" value="{{ line.price }}" />
+                                {% endif %}
+                            {% endfor %}
+                            <button class="btn btn-block btn-default btn-lg" type="submit"><i class="fa fa-close"></i> {% trans "Empty cart" %}</button>
+                        </form>
                     </div>
-                    <div class="col-md-4 col-md-offset-2 col-xs-12">
+                    <div class="col-md-4 col-md-offset-4 col-xs-12">
                         <a class="btn btn-block btn-primary btn-lg"
                                 href="{% eventurl request.event "presale:event.checkout.start" %}">
                             <i class="fa fa-shopping-cart"></i> {% trans "Proceed with checkout" %}

src/pretix/presale/urls.py

@@ -14,6 +14,7 @@ import pretix.presale.views.user
 event_patterns = [
     url(r'^cart/add$', pretix.presale.views.cart.CartAdd.as_view(), name='event.cart.add'),
     url(r'^cart/remove$', pretix.presale.views.cart.CartRemove.as_view(), name='event.cart.remove'),
+    url(r'^cart/removeall$', pretix.presale.views.cart.CartRemoveAll.as_view(), name='event.cart.remove.all'),
     url(r'^checkout/start$', pretix.presale.views.checkout.CheckoutView.as_view(), name='event.checkout.start'),
     url(r'^redeem$', pretix.presale.views.cart.RedeemView.as_view(),
         name='event.redeem'),

src/pretix/presale/views/cart.py

@@ -126,6 +126,32 @@ class CartRemove(EventViewMixin, CartActionMixin, AsyncAction, View):
                 return redirect(self.get_error_url())
 
 
+class CartRemoveAll(EventViewMixin, CartActionMixin, AsyncAction, View):
+    task = remove_items_from_cart
+
+    def get_success_message(self, value):
+        return _('Your cart is empty.')
+
+    def get_error_message(self, exception):
+        if isinstance(exception, dict) and exception['exc_type'] == 'CartError':
+            return exception['exc_message']
+        elif isinstance(exception, CartError):
+            return str(exception)
+        return super().get_error_message(exception)
+
+    def post(self, request, *args, **kwargs):
+        items = self._items_from_post_data()
+        if items:
+            return self.do(self.request.event.id, items, self.request.session.session_key)
+        else:
+            if 'ajax' in self.request.GET or 'ajax' in self.request.POST:
+                return JsonResponse({
+                    'redirect': self.get_error_url()
+                })
+            else:
+                return redirect(self.get_error_url())
+
+
 class CartAdd(EventViewMixin, CartActionMixin, AsyncAction, View):
     task = add_items_to_cart