Your IP : 192.168.165.1
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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Implement an accessible aria tree widget, from a nested unordered list.\n * Based on http://oaa-accessibility.org/example/41/.\n *\n * @module tool_lp/tree\n * @package core\n * @copyright 2015 Damyon Wiese <damyon@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery'], function($) {\n // Private variables and functions.\n var SELECTORS = {\n ITEM: '[role=treeitem]',\n GROUP: '[role=treeitem]:has([role=group]), [role=treeitem][aria-owns], [role=treeitem][data-requires-ajax=true]',\n CLOSED_GROUP: '[role=treeitem]:has([role=group])[aria-expanded=false], [role=treeitem][aria-owns][aria-expanded=false], ' +\n '[role=treeitem][data-requires-ajax=true][aria-expanded=false]',\n FIRST_ITEM: '[role=treeitem]:first',\n VISIBLE_ITEM: '[role=treeitem]:visible',\n UNLOADED_AJAX_ITEM: '[role=treeitem][data-requires-ajax=true][data-loaded=false][aria-expanded=true]'\n };\n\n /**\n * Constructor.\n *\n * @param {String} selector\n * @param {function} selectCallback Called when the active node is changed.\n */\n var Tree = function(selector, selectCallback) {\n this.treeRoot = $(selector);\n\n this.treeRoot.data('activeItem', null);\n this.selectCallback = selectCallback;\n this.keys = {\n tab: 9,\n enter: 13,\n space: 32,\n pageup: 33,\n pagedown: 34,\n end: 35,\n home: 36,\n left: 37,\n up: 38,\n right: 39,\n down: 40,\n asterisk: 106\n };\n\n // Apply the standard default initialisation for all nodes, starting with the tree root.\n this.initialiseNodes(this.treeRoot);\n // Make the first item the active item for the tree so that it is added to the tab order.\n this.setActiveItem(this.treeRoot.find(SELECTORS.FIRST_ITEM));\n // Create the cache of the visible items.\n this.refreshVisibleItemsCache();\n // Create the event handlers for the tree.\n this.bindEventHandlers();\n };\n\n Tree.prototype.registerEnterCallback = function(callback) {\n this.enterCallback = callback;\n };\n\n /**\n * Find all visible tree items and save a cache of them on the tree object.\n *\n * @method refreshVisibleItemsCache\n */\n Tree.prototype.refreshVisibleItemsCache = function() {\n this.treeRoot.data('visibleItems', this.treeRoot.find(SELECTORS.VISIBLE_ITEM));\n };\n\n /**\n * Get all visible tree items.\n *\n * @method getVisibleItems\n * @return {Object} visible items\n */\n Tree.prototype.getVisibleItems = function() {\n return this.treeRoot.data('visibleItems');\n };\n\n /**\n * Mark the given item as active within the tree and fire the callback for when the active item is set.\n *\n * @method setActiveItem\n * @param {object} item jquery object representing an item on the tree.\n */\n Tree.prototype.setActiveItem = function(item) {\n var currentActive = this.treeRoot.data('activeItem');\n if (item === currentActive) {\n return;\n }\n\n // Remove previous active from tab order.\n if (currentActive) {\n currentActive.attr('tabindex', '-1');\n currentActive.attr('aria-selected', 'false');\n }\n item.attr('tabindex', '0');\n item.attr('aria-selected', 'true');\n\n // Set the new active item.\n this.treeRoot.data('activeItem', item);\n\n if (typeof this.selectCallback === 'function') {\n this.selectCallback(item);\n }\n };\n\n /**\n * Determines if the given item is a group item (contains child tree items) in the tree.\n *\n * @method isGroupItem\n * @param {object} item jquery object representing an item on the tree.\n * @returns {bool}\n */\n Tree.prototype.isGroupItem = function(item) {\n return item.is(SELECTORS.GROUP);\n };\n\n /**\n * Determines if the given item is a group item (contains child tree items) in the tree.\n *\n * @method isGroupItem\n * @param {object} item jquery object representing an item on the tree.\n * @returns {bool}\n */\n Tree.prototype.getGroupFromItem = function(item) {\n var ariaowns = this.treeRoot.find('#' + item.attr('aria-owns'));\n var plain = item.children('[role=group]');\n if (ariaowns.length > plain.length) {\n return ariaowns;\n } else {\n return plain;\n }\n };\n\n /**\n * Determines if the given group item (contains child tree items) is collapsed.\n *\n * @method isGroupCollapsed\n * @param {object} item jquery object representing a group item on the tree.\n * @returns {bool}\n */\n Tree.prototype.isGroupCollapsed = function(item) {\n return item.attr('aria-expanded') === 'false';\n };\n\n /**\n * Determines if the given group item (contains child tree items) can be collapsed.\n *\n * @method isGroupCollapsible\n * @param {object} item jquery object representing a group item on the tree.\n * @returns {bool}\n */\n Tree.prototype.isGroupCollapsible = function(item) {\n return item.attr('data-collapsible') !== 'false';\n };\n\n /**\n * Performs the tree initialisation for all child items from the given node,\n * such as removing everything from the tab order and setting aria selected\n * on items.\n *\n * @method initialiseNodes\n * @param {object} node jquery object representing a node.\n */\n Tree.prototype.initialiseNodes = function(node) {\n this.removeAllFromTabOrder(node);\n this.setAriaSelectedFalseOnItems(node);\n\n // Get all ajax nodes that have been rendered as expanded but haven't loaded the child items yet.\n var thisTree = this;\n node.find(SELECTORS.UNLOADED_AJAX_ITEM).each(function() {\n var unloadedNode = $(this);\n // Collapse and then expand to trigger the ajax loading.\n thisTree.collapseGroup(unloadedNode);\n thisTree.expandGroup(unloadedNode);\n });\n };\n\n /**\n * Removes all child DOM elements of the given node from the tab order.\n *\n * @method removeAllFromTabOrder\n * @param {object} node jquery object representing a node.\n */\n Tree.prototype.removeAllFromTabOrder = function(node) {\n node.find('*').attr('tabindex', '-1');\n this.getGroupFromItem($(node)).find('*').attr('tabindex', '-1');\n };\n\n /**\n * Find all child tree items from the given node and set the aria selected attribute to false.\n *\n * @method setAriaSelectedFalseOnItems\n * @param {object} node jquery object representing a node.\n */\n Tree.prototype.setAriaSelectedFalseOnItems = function(node) {\n node.find(SELECTORS.ITEM).attr('aria-selected', 'false');\n };\n\n /**\n * Expand all group nodes within the tree.\n *\n * @method expandAllGroups\n */\n Tree.prototype.expandAllGroups = function() {\n var thisTree = this;\n\n this.treeRoot.find(SELECTORS.CLOSED_GROUP).each(function() {\n var groupNode = $(this);\n\n thisTree.expandGroup($(this)).done(function() {\n thisTree.expandAllChildGroups(groupNode);\n });\n });\n };\n\n /**\n * Find all child group nodes from the given node and expand them.\n *\n * @method expandAllChildGroups\n * @param {Object} item is the jquery id of the group.\n */\n Tree.prototype.expandAllChildGroups = function(item) {\n var thisTree = this;\n\n this.getGroupFromItem(item).find(SELECTORS.CLOSED_GROUP).each(function() {\n var groupNode = $(this);\n\n thisTree.expandGroup($(this)).done(function() {\n thisTree.expandAllChildGroups(groupNode);\n });\n });\n };\n\n /**\n * Expand a collapsed group.\n *\n * Handles expanding nodes that are ajax loaded (marked with a data-requires-ajax attribute).\n *\n * @method expandGroup\n * @param {Object} item is the jquery id of the parent item of the group.\n * @return {Object} a promise that is resolved when the group has been expanded.\n */\n Tree.prototype.expandGroup = function(item) {\n var promise = $.Deferred();\n // Ignore nodes that are explicitly maked as not expandable or are already expanded.\n if (item.attr('data-expandable') !== 'false' && this.isGroupCollapsed(item)) {\n // If this node requires ajax load and we haven't already loaded it.\n if (item.attr('data-requires-ajax') === 'true' && item.attr('data-loaded') !== 'true') {\n item.attr('data-loaded', false);\n // Get the closes ajax loading module specificed in the tree.\n var moduleName = item.closest('[data-ajax-loader]').attr('data-ajax-loader');\n var thisTree = this;\n // Flag this node as loading.\n item.addClass('loading');\n // Require the ajax module (must be AMD) and try to load the items.\n require([moduleName], function(loader) {\n // All ajax module must implement a \"load\" method.\n loader.load(item).done(function() {\n item.attr('data-loaded', true);\n\n // Set defaults on the newly constructed part of the tree.\n thisTree.initialiseNodes(item);\n thisTree.finishExpandingGroup(item);\n // Make sure no child elements of the item we just loaded are tabbable.\n item.removeClass('loading');\n promise.resolve();\n });\n });\n } else {\n this.finishExpandingGroup(item);\n promise.resolve();\n }\n } else {\n promise.resolve();\n }\n return promise;\n };\n\n /**\n * Perform the necessary DOM changes to display a group item.\n *\n * @method finishExpandingGroup\n * @param {Object} item is the jquery id of the parent item of the group.\n */\n Tree.prototype.finishExpandingGroup = function(item) {\n // Expand the group.\n var group = this.getGroupFromItem(item);\n group.attr('aria-hidden', 'false');\n item.attr('aria-expanded', 'true');\n\n // Update the list of visible items.\n this.refreshVisibleItemsCache();\n };\n\n /**\n * Collapse an expanded group.\n *\n * @method collapseGroup\n * @param {Object} item is the jquery id of the parent item of the group.\n */\n Tree.prototype.collapseGroup = function(item) {\n // If the item is not collapsible or already collapsed then do nothing.\n if (!this.isGroupCollapsible(item) || this.isGroupCollapsed(item)) {\n return;\n }\n\n // Collapse the group.\n var group = this.getGroupFromItem(item);\n group.attr('aria-hidden', 'true');\n item.attr('aria-expanded', 'false');\n\n // Update the list of visible items.\n this.refreshVisibleItemsCache();\n };\n\n /**\n * Expand or collapse a group.\n *\n * @method toggleGroup\n * @param {Object} item is the jquery id of the parent item of the group.\n */\n Tree.prototype.toggleGroup = function(item) {\n if (item.attr('aria-expanded') === 'true') {\n this.collapseGroup(item);\n } else {\n this.expandGroup(item);\n }\n };\n\n /**\n * Handle a key down event - ie navigate the tree.\n *\n * @method handleKeyDown\n * @param {Object} item is the jquery id of the parent item of the group.\n * @param {Event} e The event.\n * @return {Boolean}\n */\n // This function should be simplified. In the meantime..\n // eslint-disable-next-line complexity\n Tree.prototype.handleKeyDown = function(item, e) {\n var currentIndex = this.getVisibleItems().index(item);\n\n if ((e.altKey || e.ctrlKey || e.metaKey) || (e.shiftKey && e.keyCode != this.keys.tab)) {\n // Do nothing.\n return true;\n }\n\n switch (e.keyCode) {\n case this.keys.home: {\n // Jump to first item in tree.\n this.getVisibleItems().first().focus();\n\n e.stopPropagation();\n return false;\n }\n case this.keys.end: {\n // Jump to last visible item.\n this.getVisibleItems().last().focus();\n\n e.stopPropagation();\n return false;\n }\n case this.keys.enter: {\n var links = item.children('a').length ? item.children('a') : item.children().not(SELECTORS.GROUP).find('a');\n if (links.length) {\n // See if we have a callback.\n if (typeof this.enterCallback === 'function') {\n this.enterCallback(item);\n } else {\n window.location.href = links.first().attr('href');\n }\n } else if (this.isGroupItem(item)) {\n this.toggleGroup(item, true);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.space: {\n if (this.isGroupItem(item)) {\n this.toggleGroup(item, true);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.left: {\n var focusParent = function(tree) {\n // Get the immediate visible parent group item that contains this element.\n tree.getVisibleItems().filter(function() {\n return tree.getGroupFromItem($(this)).has(item).length;\n }).focus();\n };\n\n // If this is a goup item then collapse it and focus the parent group\n // in accordance with the aria spec.\n if (this.isGroupItem(item)) {\n if (this.isGroupCollapsed(item)) {\n focusParent(this);\n } else {\n this.collapseGroup(item);\n }\n } else {\n focusParent(this);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.right: {\n // If this is a group item then expand it and focus the first child item\n // in accordance with the aria spec.\n if (this.isGroupItem(item)) {\n if (this.isGroupCollapsed(item)) {\n this.expandGroup(item);\n } else {\n // Move to the first item in the child group.\n this.getGroupFromItem(item).find(SELECTORS.ITEM).first().focus();\n }\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.up: {\n\n if (currentIndex > 0) {\n var prev = this.getVisibleItems().eq(currentIndex - 1);\n\n prev.focus();\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.down: {\n\n if (currentIndex < this.getVisibleItems().length - 1) {\n var next = this.getVisibleItems().eq(currentIndex + 1);\n\n next.focus();\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.asterisk: {\n // Expand all groups.\n this.expandAllGroups();\n e.stopPropagation();\n return false;\n }\n }\n return true;\n };\n\n /**\n * Handle a click (select).\n *\n * @method handleClick\n * @param {Object} item The jquery id of the parent item of the group.\n * @param {Event} e The event.\n * @return {Boolean}\n */\n Tree.prototype.handleClick = function(item, e) {\n\n if (e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) {\n // Do nothing.\n return true;\n }\n\n // Update the active item.\n item.focus();\n\n // If the item is a group node.\n if (this.isGroupItem(item)) {\n this.toggleGroup(item);\n }\n\n e.stopPropagation();\n return true;\n };\n\n /**\n * Handle a focus event.\n *\n * @method handleFocus\n * @param {Object} item The jquery id of the parent item of the group.\n * @param {Event} e The event.\n * @return {Boolean}\n */\n Tree.prototype.handleFocus = function(item, e) {\n\n this.setActiveItem(item);\n\n e.stopPropagation();\n return true;\n };\n\n /**\n * Bind the event listeners we require.\n *\n * @method bindEventHandlers\n */\n Tree.prototype.bindEventHandlers = function() {\n var thisObj = this;\n\n // Bind event handlers to the tree items. Use event delegates to allow\n // for dynamically loaded parts of the tree.\n this.treeRoot.on({\n click: function(e) {\n return thisObj.handleClick($(this), e);\n },\n keydown: function(e) {\n return thisObj.handleKeyDown($(this), e);\n },\n focus: function(e) {\n return thisObj.handleFocus($(this), e);\n },\n }, SELECTORS.ITEM);\n };\n\n return /** @alias module:tool_lp/tree */ Tree;\n});\n"],"file":"tree.min.js"}