Event dashboard with a flat design and plugin hooks

src/pretix/control/views/event_dashboard.py

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+from decimal import Decimal
+
+from django.core.urlresolvers import reverse
+from django.db.models import Sum
+from django.dispatch import receiver
+from django.shortcuts import render
+from django.utils import formats
+from django.utils.translation import ugettext_lazy as _
+
+from pretix.base.models import Item, Order, OrderPosition
+from pretix.control.signals import event_dashboard_widgets
+
+NUM_WIDGET = '<div class="numwidget"><span class="num">{num}</span><span class="text">{text}</span></div>'
+
+
+@receiver(signal=event_dashboard_widgets)
+def base_widgets(sender, **kwargs):
+    prodc = Item.objects.filter(
+        event=sender, active=True,
+    ).count()
+
+    tickc = OrderPosition.objects.filter(
+        order__event=sender, item__admission=True
+    ).count()
+
+    paidc = OrderPosition.objects.filter(
+        order__event=sender, item__admission=True,
+        order__status=Order.STATUS_PAID,
+    ).count()
+
+    rev = Order.objects.filter(
+        event=sender,
+        status=Order.STATUS_PAID
+    ).aggregate(sum=Sum('total'))['sum'] or Decimal('0.00')
+
+    return [
+        {
+            'content': NUM_WIDGET.format(num=tickc, text=_('Attendees (ordered)')),
+            'width': 3,
+            'priority': 100,
+            'url': reverse('control:event.orders', kwargs={
+                'event': sender.slug,
+                'organizer': sender.organizer.slug
+            })
+        },
+        {
+            'content': NUM_WIDGET.format(num=paidc, text=_('Attendees (paid)')),
+            'width': 3,
+            'priority': 100,
+            'url': reverse('control:event.orders.overview', kwargs={
+                'event': sender.slug,
+                'organizer': sender.organizer.slug
+            })
+        },
+        {
+            'content': NUM_WIDGET.format(
+                num=formats.localize(rev), text=_('Total revenue ({currency})').format(currency=sender.currency)),
+            'width': 3,
+            'priority': 100,
+            'url': reverse('control:event.orders.overview', kwargs={
+                'event': sender.slug,
+                'organizer': sender.organizer.slug
+            })
+        },
+        {
+            'content': NUM_WIDGET.format(num=prodc, text=_('Active products')),
+            'width': 3,
+            'priority': 100,
+            'url': reverse('control:event.items', kwargs={
+                'event': sender.slug,
+                'organizer': sender.organizer.slug
+            })
+        },
+    ]
+
+
+def index(request, organizer, event):
+    widgets = []
+    for r, result in event_dashboard_widgets.send(sender=request.event):
+        widgets.extend(result)
+    ctx = {
+        'widgets': rearrange(widgets),
+    }
+    return render(request, 'pretixcontrol/event/index.html', ctx)
+
+
+def rearrange(widgets: list):
+    """
+    Small and stupid algorithm to arrange widget boxes without too many gaps while respecting
+    priority. Doing this siginificantly better might be *really* hard.
+    """
+    oldlist = sorted(widgets, key=lambda w: -1 * w.get('priority', 1))
+    newlist = []
+    cpos = 0
+    while len(oldlist) > 0:
+        max_prio = max([w.get('priority', 1) for w in oldlist])
+        try:
+            best = max([w for w in oldlist if w.get('priority', 1) == max_prio and cpos + w.get('width', 3) <= 12],
+                       key=lambda w: w.get('width', 3))
+            cpos = (cpos + best.get('width', 3)) % 12
+        except ValueError:  # max() arg is an empty sequence
+            best = [w for w in oldlist if w.get('priority', 1) == max_prio][0]
+            cpos = best.get('width', 3)
+        oldlist.remove(best)
+        newlist.append(best)
+
+    return newlist