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YUI.add('moodle-course-categoryexpander', function (Y, NAME) {
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* Adds toggling of subcategory with automatic loading using AJAX.
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* This also includes application of an animation to improve user experience.
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* @module moodle-course-categoryexpander
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* The course category expander.
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* @class Y.Moodle.course.categoryexpander
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CONTENTNODE: 'content',
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COLLAPSEALL: 'collapse-all',
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NOTLOADED: 'notloaded',
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SECTIONCOLLAPSED: 'collapsed',
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SECTIONEXPANDED: 'expanded',
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HASCHILDREN: 'with_children'
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LOADEDTREES: '.with_children.loaded',
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CONTENTNODE: '.content',
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CATEGORYLISTENLINK: '.category .info .name',
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CATEGORYSPINNERLOCATION: '.name',
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CATEGORYWITHCOLLAPSEDLOADEDCHILDREN: '.category.with_children.loaded.collapsed',
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CATEGORYWITHMAXIMISEDLOADEDCHILDREN: '.category.with_children.loaded.expanded',
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COLLAPSEEXPAND: '.collapseexpand',
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COURSEBOX: '.coursebox',
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COURSEBOXLISTENLINK: '.coursebox .moreinfo',
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COURSEBOXSPINNERLOCATION: '.name a',
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COURSECATEGORYTREE: '.course_category_tree',
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PARENTWITHCHILDREN: '.category'
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NS = Y.namespace('Moodle.course.categoryexpander'),
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URL = M.cfg.wwwroot + '/course/category.ajax.php';
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* Set up the category expander.
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* No arguments are required.
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NS.init = function() {
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var doc = Y.one(Y.config.doc);
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doc.delegate('click', this.toggle_category_expansion, SELECTORS.CATEGORYLISTENLINK, this);
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doc.delegate('click', this.toggle_coursebox_expansion, SELECTORS.COURSEBOXLISTENLINK, this);
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doc.delegate('click', this.collapse_expand_all, SELECTORS.COLLAPSEEXPAND, this);
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// Only set up they keybaord listeners when tab is first pressed - it
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// may never happen and modifying the DOM on a large number of nodes
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// can be very expensive.
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doc.once('key', this.setup_keyboard_listeners, 'tab', this);
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* Set up keyboard expansion for course content.
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* This includes setting up the delegation but also adding the nodes to the
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* @method setup_keyboard_listeners
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NS.setup_keyboard_listeners = function() {
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var doc = Y.one(Y.config.doc);
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doc.all(SELECTORS.CATEGORYLISTENLINK, SELECTORS.COURSEBOXLISTENLINK, SELECTORS.COLLAPSEEXPAND).setAttribute('tabindex', '0');
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Y.one(Y.config.doc).delegate('key', this.toggle_category_expansion, 'enter', SELECTORS.CATEGORYLISTENLINK, this);
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Y.one(Y.config.doc).delegate('key', this.toggle_coursebox_expansion, 'enter', SELECTORS.COURSEBOXLISTENLINK, this);
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Y.one(Y.config.doc).delegate('key', this.collapse_expand_all, 'enter', SELECTORS.COLLAPSEEXPAND, this);
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* Toggle the animation of the clicked category node.
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* @method toggle_category_expansion
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* @param {EventFacade} e
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NS.toggle_category_expansion = function(e) {
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// Load the actual dependencies now that we've been called.
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Y.use('io-base', 'json-parse', 'moodle-core-notification', 'anim-node-plugin', function() {
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// Overload the toggle_category_expansion with the _toggle_category_expansion function to ensure that
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// this function isn't called in the future, and call it for the first time.
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NS.toggle_category_expansion = NS._toggle_category_expansion;
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NS.toggle_category_expansion(e);
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* Toggle the animation of the clicked coursebox node.
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* @method toggle_coursebox_expansion
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* @param {EventFacade} e
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NS.toggle_coursebox_expansion = function(e) {
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// Load the actual dependencies now that we've been called.
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Y.use('io-base', 'json-parse', 'moodle-core-notification', 'anim-node-plugin', function() {
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// Overload the toggle_coursebox_expansion with the _toggle_coursebox_expansion function to ensure that
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// this function isn't called in the future, and call it for the first time.
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NS.toggle_coursebox_expansion = NS._toggle_coursebox_expansion;
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NS.toggle_coursebox_expansion(e);
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NS._toggle_coursebox_expansion = function(e) {
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// Grab the parent category container - this is where the new content will be added.
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courseboxnode = e.target.ancestor(SELECTORS.COURSEBOX, true);
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if (courseboxnode.hasClass(CSS.LOADED)) {
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// We've already loaded this content so we just need to toggle the view of it.
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this.run_expansion(courseboxnode);
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this._toggle_generic_expansion({
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parentnode: courseboxnode,
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childnode: courseboxnode.one(SELECTORS.CONTENTNODE),
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spinnerhandle: SELECTORS.COURSEBOXSPINNERLOCATION,
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courseid: courseboxnode.getData('courseid'),
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NS._toggle_category_expansion = function(e) {
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if (e.target.test('a') || e.target.test('img')) {
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// Return early if either an anchor or an image were clicked.
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// Grab the parent category container - this is where the new content will be added.
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categorynode = e.target.ancestor(SELECTORS.PARENTWITHCHILDREN, true);
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if (!categorynode.hasClass(CSS.HASCHILDREN)) {
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// Nothing to do here - this category has no children.
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if (categorynode.hasClass(CSS.LOADED)) {
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// We've already loaded this content so we just need to toggle the view of it.
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this.run_expansion(categorynode);
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// We use Data attributes to store the category.
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categoryid = categorynode.getData('categoryid');
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depth = categorynode.getData('depth');
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if (typeof categoryid === "undefined" || typeof depth === "undefined") {
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this._toggle_generic_expansion({
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parentnode: categorynode,
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childnode: categorynode.one(SELECTORS.CONTENTNODE),
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spinnerhandle: SELECTORS.CATEGORYSPINNERLOCATION,
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categoryid: categoryid,
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showcourses: categorynode.getData('showcourses'),
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* Wrapper function to handle toggling of generic types.
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* @method _toggle_generic_expansion
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* @param {Object} config
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NS._toggle_generic_expansion = function(config) {
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if (config.spinnerhandle) {
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// Add a spinner to give some feedback to the user.
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spinner = M.util.add_spinner(Y, config.parentnode.one(config.spinnerhandle)).show();
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complete: this.process_results
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parentnode: config.parentnode,
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childnode: config.childnode,
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* Apply the animation on the supplied node.
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* @method run_expansion
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* @param {Node} categorynode The node to apply the animation to
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NS.run_expansion = function(categorynode) {
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var categorychildren = categorynode.one(SELECTORS.CONTENTNODE),
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ancestor = categorynode.ancestor(SELECTORS.COURSECATEGORYTREE);
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// Add our animation to the categorychildren.
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this.add_animation(categorychildren);
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// If we already have the class, remove it before showing otherwise we perform the
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// animation whilst the node is hidden.
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if (categorynode.hasClass(CSS.SECTIONCOLLAPSED)) {
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// To avoid a jump effect, we need to set the height of the children to 0 here before removing the SECTIONCOLLAPSED class.
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categorychildren.setStyle('height', '0');
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categorynode.removeClass(CSS.SECTIONCOLLAPSED);
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categorynode.addClass(CSS.SECTIONEXPANDED);
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categorynode.setAttribute('aria-expanded', 'true');
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categorychildren.fx.set('reverse', false);
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categorychildren.fx.set('reverse', true);
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categorychildren.fx.once('end', function(e, categorynode) {
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categorynode.addClass(CSS.SECTIONCOLLAPSED);
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categorynode.removeClass(CSS.SECTIONEXPANDED);
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categorynode.setAttribute('aria-expanded', 'false');
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}, this, categorynode);
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categorychildren.fx.once('end', function(e, categorychildren) {
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// Remove the styles that the animation has set.
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categorychildren.setStyles({
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// To avoid memory gobbling, remove the animation. It will be added back if called again.
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self.update_collapsible_actions(ancestor);
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}, categorychildren.fx, categorychildren);
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// Now that everything has been set up, run the animation.
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categorychildren.fx.run();
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* Toggle collapsing of all nodes.
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* @method collapse_expand_all
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* @param {EventFacade} e
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NS.collapse_expand_all = function(e) {
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// Load the actual dependencies now that we've been called.
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Y.use('io-base', 'json-parse', 'moodle-core-notification', 'anim-node-plugin', function() {
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// Overload the collapse_expand_all with the _collapse_expand_all function to ensure that
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// this function isn't called in the future, and call it for the first time.
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NS.collapse_expand_all = NS._collapse_expand_all;
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NS.collapse_expand_all(e);
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NS._collapse_expand_all = function(e) {
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// The collapse/expand button has no actual target but we need to prevent it's default
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// action to ensure we don't make the page reload/jump.
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if (e.currentTarget.hasClass(CSS.DISABLED)) {
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// The collapse/expand is currently disabled.
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var ancestor = e.currentTarget.ancestor(SELECTORS.COURSECATEGORYTREE);
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var collapseall = ancestor.one(SELECTORS.COLLAPSEEXPAND);
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if (collapseall.hasClass(CSS.COLLAPSEALL)) {
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this.collapse_all(ancestor);
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this.expand_all(ancestor);
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this.update_collapsible_actions(ancestor);
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NS.expand_all = function(ancestor) {
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var finalexpansions = [];
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ancestor.all(SELECTORS.CATEGORYWITHCOLLAPSEDLOADEDCHILDREN)
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if (c.ancestor(SELECTORS.CATEGORYWITHCOLLAPSEDLOADEDCHILDREN)) {
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// Expand the hidden children first without animation.
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c.removeClass(CSS.SECTIONCOLLAPSED);
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c.addClass(CSS.SECTIONEXPANDED);
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c.all(SELECTORS.LOADEDTREES).removeClass(CSS.SECTIONCOLLAPSED);
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finalexpansions.push(c);
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// Run the final expansion with animation on the visible items.
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Y.all(finalexpansions).each(function(c) {
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this.run_expansion(c);
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NS.collapse_all = function(ancestor) {
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var finalcollapses = [];
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ancestor.all(SELECTORS.CATEGORYWITHMAXIMISEDLOADEDCHILDREN)
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if (c.ancestor(SELECTORS.CATEGORYWITHMAXIMISEDLOADEDCHILDREN)) {
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finalcollapses.push(c);
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// Collapse the visible items first
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this.run_expansion(c);
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// Run the final collapses now that the these are hidden hidden.
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Y.all(finalcollapses).each(function(c) {
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c.addClass(CSS.SECTIONCOLLAPSED);
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c.removeClass(CSS.SECTIONEXPANDED);
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c.all(SELECTORS.LOADEDTREES).addClass(CSS.SECTIONCOLLAPSED);
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NS.update_collapsible_actions = function(ancestor) {
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var foundmaximisedchildren = false,
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// Grab the anchor for the collapseexpand all link.
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togglelink = ancestor.one(SELECTORS.COLLAPSEEXPAND);
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// We should always have a togglelink but ensure.
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// Search for any visibly expanded children.
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ancestor.all(SELECTORS.CATEGORYWITHMAXIMISEDLOADEDCHILDREN).each(function(n) {
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// If we can find any collapsed ancestors, skip.
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if (n.ancestor(SELECTORS.CATEGORYWITHCOLLAPSEDLOADEDCHILDREN)) {
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foundmaximisedchildren = true;
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if (foundmaximisedchildren) {
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// At least one maximised child found. Show the collapseall.
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togglelink.setHTML(M.util.get_string('collapseall', 'moodle'))
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.addClass(CSS.COLLAPSEALL)
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.removeClass(CSS.DISABLED);
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// No maximised children found but there are collapsed children. Show the expandall.
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togglelink.setHTML(M.util.get_string('expandall', 'moodle'))
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.removeClass(CSS.COLLAPSEALL)
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.removeClass(CSS.DISABLED);
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* Process the data returned by Y.io.
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* This includes appending it to the relevant part of the DOM, and applying our animations.
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* @method process_results
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* @param {String} tid The Transaction ID
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* @param {Object} response The Reponse returned by Y.IO
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* @param {Object} ioargs The additional arguments provided by Y.IO
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NS.process_results = function(tid, response, args) {
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data = Y.JSON.parse(response.responseText);
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return new M.core.ajaxException(data);
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return new M.core.exception(e);
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// Insert the returned data into a new Node.
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newnode = Y.Node.create(data);
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// Append to the existing child location.
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args.childnode.appendChild(newnode);
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// Now that we have content, we can swap the classes on the toggled container.
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.addClass(CSS.LOADED)
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.removeClass(CSS.NOTLOADED);
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// Toggle the open/close status of the node now that it's content has been loaded.
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this.run_expansion(args.parentnode);
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// Remove the spinner now that we've started to show the content.
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args.spinner.hide().destroy();
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* Add our animation to the Node.
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* @method add_animation
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* @param {Node} childnode
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NS.add_animation = function(childnode) {
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if (typeof childnode.fx !== "undefined") {
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// The animation has already been plugged to this node.
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childnode.plug(Y.Plugin.NodeFX, {
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// This sets a dynamic height in case the node content changes.
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height: function(node) {
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// Get expanded height (offsetHeight may be zero).
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return node.get('scrollHeight');
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}, '@VERSION@', {"requires": ["node", "event-key"]});