From 0acba204f0de2a46fa8f0c113a10a7b3308fcde1 Mon Sep 17 00:00:00 2001
From: Gideon Thomas <r.gideonthomas@gmail.com>
Date: Fri, 8 Sep 2017 12:14:35 -0400
Subject: [PATCH] Add Homepage admin view (#723)

---
 network-api/app/networkapi/homepage/admin.py  | 79 ++++++++++++++++++-
 .../homepage/templatetags/__init__.py         |  0
 .../templatetags/homepage_customization.py    | 53 +++++++++++++
 .../homepage/edit_inline/stacked.html         | 55 +++++++++++++
 .../homepage/homepage/includes/fieldset.html  | 31 ++++++++
 5 files changed, 216 insertions(+), 2 deletions(-)
 create mode 100644 network-api/app/networkapi/homepage/templatetags/__init__.py
 create mode 100644 network-api/app/networkapi/homepage/templatetags/homepage_customization.py
 create mode 100644 network-api/app/networkapi/templates/admin/homepage/homepage/edit_inline/stacked.html
 create mode 100644 network-api/app/networkapi/templates/admin/homepage/homepage/includes/fieldset.html

diff --git a/network-api/app/networkapi/homepage/admin.py b/network-api/app/networkapi/homepage/admin.py
index 4185d360e9a..b2aaaa0677b 100644
--- a/network-api/app/networkapi/homepage/admin.py
+++ b/network-api/app/networkapi/homepage/admin.py
@@ -1,3 +1,78 @@
-# from django.contrib import admin
+from django.contrib import admin
+from mezzanine.utils.admin import SingletonAdmin
 
-# Register your models here.
+from networkapi.homepage.models import (
+    Homepage,
+    HomepageLeaders,
+    HomepageNews,
+    HomepageHighlights,
+)
+
+
+# Base class for the inline forms for People, News, and Highlights
+# containing the common config for each of the forms
+class FeatureInlineAdmin(admin.StackedInline):
+    extra = 0  # Allows us to show the 'Add another' link
+    min_num = 3
+    # We override the default template for stacked inlines so that we can
+    # customize the label for each field
+    template = 'admin/homepage/homepage/edit_inline/stacked.html'
+
+    # To disable the icons that allow you to add/change the related models,
+    # we set the flags that allow these operations to False on the widgets
+    # associated with those related model fields. We override the formset
+    # method to get access to those fields.
+    def get_formset(self, request, obj=None, **kwargs):
+        formset = super().get_formset(request, obj, **kwargs)
+        base_fields = formset.form.base_fields
+
+        for field in base_fields:
+            base_fields[field].widget.can_add_related = False
+            base_fields[field].widget.can_change_related = False
+            base_fields[field].label = 'Feature'
+
+        return formset
+
+    # Only superusers can add new homepage fields
+    def has_add_permission(self, request):
+        return request.user.is_superuser
+
+
+class LeaderInlineAdmin(FeatureInlineAdmin):
+    model = HomepageLeaders
+    fields = ('leader',)
+
+
+class NewsInlineAdmin(FeatureInlineAdmin):
+    model = HomepageNews
+    fields = ('news',)
+    min_num = 4
+
+
+class HighlightInlineAdmin(FeatureInlineAdmin):
+    model = HomepageHighlights
+    fields = ('highlights',)
+
+
+class HomepageAdmin(SingletonAdmin):
+    inlines = [
+        LeaderInlineAdmin,
+        NewsInlineAdmin,
+        HighlightInlineAdmin,
+    ]
+
+    # We override this function so that we can rename the header shown for this
+    # admin view
+    def change_view(self, request, object_id, form_url='', extra_context=None):
+        extra_context = extra_context or {}
+        extra_context['title'] = 'Homepage Features'
+
+        return super().change_view(
+            request,
+            object_id,
+            form_url,
+            extra_context=extra_context,
+        )
+
+
+admin.site.register(Homepage, HomepageAdmin)
diff --git a/network-api/app/networkapi/homepage/templatetags/__init__.py b/network-api/app/networkapi/homepage/templatetags/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/network-api/app/networkapi/homepage/templatetags/homepage_customization.py b/network-api/app/networkapi/homepage/templatetags/homepage_customization.py
new file mode 100644
index 00000000000..039ac37f73e
--- /dev/null
+++ b/network-api/app/networkapi/homepage/templatetags/homepage_customization.py
@@ -0,0 +1,53 @@
+from django import template
+from django.utils.html import conditional_escape
+from django.utils.safestring import mark_safe
+
+from networkapi.homepage.models import HomepageNews, HomepageHighlights
+
+
+register = template.Library()
+
+
+# This template tag allows us to customize the label for each choice field
+# for People, News, and Highlights. It also allows us to add special case
+# labels for certain fields.
+# Most of this code is copied from
+# django.contrib.admin.helpers.AdminField.label_tag() with some minor tweaks
+@register.simple_tag(takes_context=True)
+def get_label_for_field(context, field_number):
+    admin_field = context['field']
+    classes = []
+    instance = admin_field.field.form.instance
+    label = None
+
+    # Rename the first field for the News section to indicate a video feature
+    if isinstance(instance, HomepageNews):
+        if field_number is 1:
+            label = 'Video Feature'
+        # Since we renamed the label for the first field, every subsequent
+        # field will now be numbered 1 less than what they originally were
+        field_number -= 1
+    # Rename the first field for the Highlights section to indicate a project
+    # feature
+    elif isinstance(instance, HomepageHighlights):
+        if field_number is 1:
+            label = 'Project Feature'
+        field_number -= 1
+
+    # Default label for a field is the initial label followed by the number
+    if label is None:
+        label = '{} {}'.format(admin_field.field.label, field_number)
+
+    contents = conditional_escape(label)
+
+    if admin_field.field.field.required:
+        classes.append('required')
+    if not admin_field.is_first:
+        classes.append('inline')
+    attrs = {'class': ' '.join(classes)} if classes else {}
+
+    return admin_field.field.label_tag(
+        contents=mark_safe(contents),
+        attrs=attrs,
+        label_suffix='',
+    )
diff --git a/network-api/app/networkapi/templates/admin/homepage/homepage/edit_inline/stacked.html b/network-api/app/networkapi/templates/admin/homepage/homepage/edit_inline/stacked.html
new file mode 100644
index 00000000000..bf6dc04e021
--- /dev/null
+++ b/network-api/app/networkapi/templates/admin/homepage/homepage/edit_inline/stacked.html
@@ -0,0 +1,55 @@
+{% load i18n %}
+
+<div id="{{ inline_admin_formset.formset.prefix }}-group"
+     class="inline-group inline-stacked{% if inline_admin_formset.opts.sortable %} sortable{% endif %}{% if inline_admin_formset.opts.classes %} {{ inline_admin_formset.opts.classes|join:" " }}{% endif %}" name="inlinegroup">
+    <h2>{{ inline_admin_formset.opts.verbose_name_plural|title }}</h2>
+    {{ inline_admin_formset.formset.management_form }}
+    {{ inline_admin_formset.formset.non_form_errors }}
+    <div class="items"> <!-- sortable container -->
+        {% for inline_admin_form in inline_admin_formset %}
+        <div id="{{ inline_admin_formset.formset.prefix }}-{% if not forloop.last %}{{ forloop.counter0 }}{% else %}empty{% endif %}"
+             class="inline-related {% if inline_admin_form.original or inline_admin_form.show_url %} has_original{% endif %}{% if forloop.last %} empty-form{% endif %}"> <!-- sortable items -->
+            <!-- fieldsets -->
+            {% if inline_admin_form.form.non_field_errors %}{{ inline_admin_form.form.non_field_errors }}{% endif %}
+            {% with field_number=forloop.counter %}
+            {% for fieldset in inline_admin_form %}
+                {% include "admin/homepage/homepage/includes/fieldset.html" %}
+            {% endfor %}
+            {% endwith %}
+            {% if inline_admin_form.needs_explicit_pk_field %}{{ inline_admin_form.pk_field.field }}{% endif %}
+            {{ inline_admin_form.fk_field.field }}
+        </div>
+        {% endfor %}
+        {{ inline_admin_formset.extra_forms }}
+    </div>
+</div>
+
+<div class="sortablehelper">
+    <h3><b>Sortable Helper</b></h3>
+</div>
+
+<script type="text/javascript">
+(function($) {
+  var prefix = "{{ inline_admin_formset.formset.prefix|escapejs }}";
+  $("#{{ inline_admin_formset.formset.prefix|escapejs }}-group .inline-related").stackedFormset({
+    prefix: prefix,
+    addText: "{% filter escapejs %}{% blocktrans with inline_admin_formset.opts.verbose_name|capfirst as verbose_name %}Add another {{ verbose_name }}{% endblocktrans %}{% endfilter %}",
+    deleteText: "{% filter escapejs %}{% trans 'Delete Item' %}{% endfilter %}",
+  });
+  $(document).on("formset:added", function(event, $row, targetPrefix) {
+    if (targetPrefix === prefix) {
+        // Tweak the Delete link to resemble the ones defined in template
+        var $deleteLink = $row.find(".inline-deletelink");
+        $deleteLink
+            .appendTo($row.find("ul.inline-item-tools"))
+            .wrap("<li/>")
+            .addClass("deletelink")
+            .attr("title", $deleteLink.text())
+            .text("");
+    }
+  });
+  $(function() {
+    $(".items > .inline-related").removeClass("collapsed");
+  });
+})(django.jQuery);
+</script>
diff --git a/network-api/app/networkapi/templates/admin/homepage/homepage/includes/fieldset.html b/network-api/app/networkapi/templates/admin/homepage/homepage/includes/fieldset.html
new file mode 100644
index 00000000000..4f51f936d39
--- /dev/null
+++ b/network-api/app/networkapi/templates/admin/homepage/homepage/includes/fieldset.html
@@ -0,0 +1,31 @@
+{% load homepage_customization %}
+<fieldset class="module aligned {{ fieldset.classes }}">
+    {% if fieldset.name %}<h2>{{ fieldset.name }}</h2>{% endif %}
+
+    {% if fieldset.description %}
+    <div class="description">{{ fieldset.description|safe }}</div>
+    {% endif %}
+
+    {% for line in fieldset %}
+    <div class="form-row{% if line.fields|length_is:'1' and line.errors %} errors{% endif %}{% if not line.has_visible_field %} hidden{% endif %}{% for field in line %}{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% endfor %}">
+        {% if line.fields|length_is:'1' %}{{ line.errors }}{% endif %}
+
+        {% for field in line %}
+        <div{% if not line.fields|length_is:'1' %} class="field-box{% if field.field.name %} field-{{ field.field.name }}{% endif %}{% if not field.is_readonly and field.errors %} errors{% endif %}{% if field.field.is_hidden %} hidden{% endif %}"{% endif %}>
+            {% if not line.fields|length_is:'1' and not field.is_readonly %}{{ field.errors }}{% endif %}
+            {% get_label_for_field field_number %}
+
+            {% if field.is_readonly %}
+                <div class="readonly">{{ field.contents }}</div>
+            {% else %}
+                {{ field.field }}
+            {% endif %}
+
+            {% if field.field.help_text %}
+                <div class="help">{{ field.field.help_text|safe }}</div>
+            {% endif %}
+        </div>
+        {% endfor %}
+    </div>
+    {% endfor %}
+</fieldset>