core&ui: add homework files & enhance delete operation (#755)

packages/ui-default/templates/homework_files.html

@@ -0,0 +1,24 @@
+{% extends "layout/basic.html" %}
+{% block content %}
+{{ set(UiContext, 'tdoc', tdoc) }}
+<div class="row">
+  <div class="medium-9 columns">
+    <div class="section">
+      <div class="section__header">
+        <h1 class="section__title">{{ _('Files') }}</h1>
+        <div class="section__tools">
+          <button class="primary rounded button" name="upload_file">{{ _('Upload File') }}</button>
+        </div>
+      </div>
+      {{ noscript_note.render() }}
+      {% include "partials/files.html" %}
+      <div class="section__body">
+        <button class="rounded button" name="remove_selected">{{ _('Remove Selected') }}</button>
+      </div>
+    </div>
+  </div>
+  <div class="medium-3 columns">
+    {% include "partials/homework_sidebar.html" %}
+  </div>
+</div>
+{% endblock %}

packages/ui-default/templates/partials/homework_sidebar.html

@@ -55,6 +55,9 @@
       <li class="menu__item"><a class="menu__link" href="{{ url('homework_edit', tid=tdoc.docId) }}">
         <span class="icon icon-edit"></span> {{ _('Edit Homework') }}
       </a></li>
+      <li class="menu__item"><a class="menu__link" href="{{ url('homework_files', tid=tdoc.docId) }}">
+        <span class="icon icon-file"></span> {{ _('Files') }}
+      </a></li>
     {% endif %}
     {% if handler.user.own(tdoc) or handler.user.hasPriv(PRIV.PRIV_READ_RECORD_CODE) or handler.user.hasPerm(perm.PERM_READ_RECORD_CODE) %}
       <li class="menu__item"><a class="menu__link" href="{{ url('homework_code', tid=tdoc.docId) }}" data-no-instant>