MDL-32657: Add format.js for topics format and remove default

Using topics format as default is not a great idea, as we can end up
half-working dragdrop for some formats. With the current soiution, drag-drop
will not work for format, unless required js functions have been created in
format.js

course/format/topics/format.js

@@ -0,0 +1,40 @@
+// Javascript functions for course format
+
+M.course = M.course || {};
+
+M.course.format = M.course.format || {};
+
+/**
+ * Get section list for this format
+ *
+ * @param {YUI} Y YUI3 instance
+ * @return {string} section list selector
+ */
+M.course.format.get_section_selector = function(Y) {
+    return 'li.section';
+}
+
+/**
+ * Swap section
+ *
+ * @param {YUI} Y YUI3 instance
+ * @param {string} node1 node to swap to
+ * @param {string} node2 node to swap with
+ * @return {NodeList} section list
+ */
+M.course.format.swap_sections = function(Y, node1, node2) {
+    var CSS = {
+        COURSECONTENT : 'course-content',
+        LEFT : 'left',
+        RIGHT : 'right',
+        SECTIONADDMENUS : 'section_add_menus',
+    };
+
+    var sectionlist = Y.Node.all('.'+CSS.COURSECONTENT+' '+M.course.format.get_section_selector(Y));
+    // Swap left block
+    sectionlist.item(node1).one('.'+CSS.LEFT).swap(sectionlist.item(node2).one('.'+CSS.LEFT));
+    // Swap right block
+    sectionlist.item(node1).one('.'+CSS.RIGHT).swap(sectionlist.item(node2).one('.'+CSS.RIGHT));
+    // Swap menus
+    sectionlist.item(node1).one('.'+CSS.SECTIONADDMENUS).swap(sectionlist.item(node2).one('.'+CSS.SECTIONADDMENUS));
+}

course/format/topics/format.php

@@ -286,3 +286,6 @@ if (!empty($sectionmenu)) {
     $select->formid = 'sectionmenu';
     echo $OUTPUT->render($select);
 }
+
+    // Include course format js module
+    $PAGE->requires->js('/course/format/topics/format.js');