improve the round index page in model admin

opentech/apply/funds/admin.py

+from django.urls import reverse
+from django.utils.text import mark_safe
+
 from wagtail.contrib.modeladmin.options import ModelAdmin, ModelAdminGroup
+from wagtail.contrib.modeladmin.helpers import PageButtonHelper
 
 from .models import ApplicationForm, FundType, Round
 from opentech.apply.categories.admin import CategoryAdmin
 
 
+class ButtonsWithPreview(PageButtonHelper):
+    def preview_button(self, obj, classnames_add, classnames_exclude):
+        classnames = self.copy_button_classnames + classnames_add
+        cn = self.finalise_classname(classnames, classnames_exclude)
+        return {
+            'url': reverse('wagtailadmin_pages:view_draft', args=(obj.id,)),
+            'label': 'Preview',
+            'classname': cn,
+            'title': 'Preview this %s' % self.verbose_name,
+        }
+
+    def get_buttons_for_obj(self, obj, exclude=list(), classnames_add=list(),
+                            classnames_exclude=list()):
+        btns = super().get_buttons_for_obj(obj, exclude, classnames_add, classnames_exclude)
+
+        # Put preview before delete
+        btns.insert(-1, self.preview_button(obj, classnames_add, classnames_exclude))
+
+        return btns
+
+
 class RoundAdmin(ModelAdmin):
     model = Round
     menu_icon = 'doc-empty'
+    list_display = ('title', 'fund', 'start_date', 'end_date')
+    button_helper_class = ButtonsWithPreview
+
+    def fund(self, obj):
+        return obj.get_parent()
 
 
 class FundAdmin(ModelAdmin):