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 * To respond to selection changed events - use tree.on(\"selectionchanged\", handler).\n * The handler will receive an array of nodes, which are the list items that are currently\n * selected. (Or a single node if multiselect is disabled).\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', 'core/url', 'core/log'], function($, url, log) {\n // Private variables and functions.\n /** @var {String} expandedImage The html for an expanded tree node twistie. */\n var expandedImage = $('<img alt=\"\" src=\"' + url.imageUrl('t/expanded') + '\"/>');\n /** @var {String} collapsedImage The html for a collapsed tree node twistie. */\n var collapsedImage = $('<img alt=\"\" src=\"' + url.imageUrl('t/collapsed') + '\"/>');\n\n /**\n * Constructor\n *\n * @param {String} selector\n * @param {Boolean} multiSelect\n */\n var Tree = function(selector, multiSelect) {\n this.treeRoot = $(selector);\n this.multiSelect = (typeof multiSelect === 'undefined' || multiSelect === true);\n\n this.items = this.treeRoot.find('li');\n this.expandAll = this.items.length < 20;\n this.parents = this.treeRoot.find('li:has(ul)');\n\n if (multiSelect) {\n this.treeRoot.attr('aria-multiselectable', 'true');\n }\n\n this.items.attr('aria-selected', 'false');\n\n this.visibleItems = null;\n this.activeItem = null;\n this.lastActiveItem = null;\n\n this.keys = {\n tab: 9,\n enter: 13,\n space: 32,\n pageup: 33,\n pagedown: 34,\n end: 35,\n home: 36,\n left: 37,\n up: 38,\n right: 39,\n down: 40,\n eight: 56,\n asterisk: 106\n };\n\n this.init();\n\n this.bindEventHandlers();\n };\n // Public variables and functions.\n\n /**\n * Init this tree\n * @method init\n */\n Tree.prototype.init = function() {\n this.parents.attr('aria-expanded', 'true');\n this.parents.prepend(expandedImage.clone());\n\n this.items.attr('role', 'tree-item');\n this.items.attr('tabindex', '-1');\n this.parents.attr('role', 'group');\n this.treeRoot.attr('role', 'tree');\n\n this.visibleItems = this.treeRoot.find('li');\n\n var thisObj = this;\n if (!this.expandAll) {\n this.parents.each(function() {\n thisObj.collapseGroup($(this));\n });\n this.expandGroup(this.parents.first());\n }\n };\n\n /**\n * Expand a collapsed group.\n *\n * @method expandGroup\n * @param {Object} item is the jquery id of the parent item of the group\n */\n Tree.prototype.expandGroup = function(item) {\n // Find the first child ul node.\n var group = item.children('ul');\n\n // Expand the group.\n group.show().attr('aria-hidden', 'false');\n\n item.attr('aria-expanded', 'true');\n\n item.children('img').attr('src', expandedImage.attr('src'));\n\n // Update the list of visible items.\n this.visibleItems = this.treeRoot.find('li:visible');\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 var group = item.children('ul');\n\n // Collapse the group.\n group.hide().attr('aria-hidden', 'true');\n\n item.attr('aria-expanded', 'false');\n\n item.children('img').attr('src', collapsedImage.attr('src'));\n\n // Update the list of visible items.\n this.visibleItems = this.treeRoot.find('li:visible');\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 * Whenever the currently selected node has changed, trigger an event using this function.\n *\n * @method triggerChange\n */\n Tree.prototype.triggerChange = function() {\n var allSelected = this.items.filter('[aria-selected=true]');\n if (!this.multiSelect) {\n allSelected = allSelected.first();\n }\n this.treeRoot.trigger('selectionchanged', {selected: allSelected});\n };\n\n /**\n * Select all the items between the last focused item and this currently focused item.\n *\n * @method multiSelectItem\n * @param {Object} item is the jquery id of the newly selected item.\n */\n Tree.prototype.multiSelectItem = function(item) {\n if (!this.multiSelect) {\n this.items.attr('aria-selected', 'false');\n } else if (this.lastActiveItem !== null) {\n var lastIndex = this.visibleItems.index(this.lastActiveItem);\n var currentIndex = this.visibleItems.index(this.activeItem);\n var oneItem = null;\n\n while (lastIndex < currentIndex) {\n oneItem = $(this.visibleItems.get(lastIndex));\n oneItem.attr('aria-selected', 'true');\n lastIndex++;\n }\n while (lastIndex > currentIndex) {\n oneItem = $(this.visibleItems.get(lastIndex));\n oneItem.attr('aria-selected', 'true');\n lastIndex--;\n }\n }\n\n item.attr('aria-selected', 'true');\n this.triggerChange();\n };\n\n /**\n * Select a single item. Make sure all the parents are expanded. De-select all other items.\n *\n * @method selectItem\n * @param {Object} item is the jquery id of the newly selected item.\n */\n Tree.prototype.selectItem = function(item) {\n // Expand all nodes up the tree.\n var walk = item.parent();\n while (walk.attr('role') != 'tree') {\n walk = walk.parent();\n if (walk.attr('aria-expanded') == 'false') {\n this.expandGroup(walk);\n }\n walk = walk.parent();\n }\n this.items.attr('aria-selected', 'false');\n item.attr('aria-selected', 'true');\n this.triggerChange();\n };\n\n /**\n * Toggle the selected state for an item back and forth.\n *\n * @method toggleItem\n * @param {Object} item is the jquery id of the item to toggle.\n */\n Tree.prototype.toggleItem = function(item) {\n if (!this.multiSelect) {\n this.selectItem(item);\n return;\n }\n\n var current = item.attr('aria-selected');\n if (current === 'true') {\n current = 'false';\n } else {\n current = 'true';\n }\n item.attr('aria-selected', current);\n this.triggerChange();\n };\n\n /**\n * Set the focus to this item.\n *\n * @method updateFocus\n * @param {Object} item is the jquery id of the parent item of the group\n */\n Tree.prototype.updateFocus = function(item) {\n this.lastActiveItem = this.activeItem;\n this.activeItem = item;\n // Expand all nodes up the tree.\n var walk = item.parent();\n while (walk.attr('role') != 'tree') {\n walk = walk.parent();\n if (walk.attr('aria-expanded') == 'false') {\n this.expandGroup(walk);\n }\n walk = walk.parent();\n }\n this.items.attr('tabindex', '-1');\n item.attr('tabindex', 0);\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.visibleItems.index(item);\n var newItem = null;\n var hasKeyModifier = e.shiftKey || e.ctrlKey || e.metaKey || e.altKey;\n var thisObj = this;\n\n switch (e.keyCode) {\n case this.keys.home: {\n // Jump to first item in tree.\n newItem = this.parents.first();\n newItem.focus();\n if (e.shiftKey) {\n this.multiSelectItem(newItem);\n } else if (!hasKeyModifier) {\n this.selectItem(newItem);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.end: {\n // Jump to last visible item.\n newItem = this.visibleItems.last();\n newItem.focus();\n if (e.shiftKey) {\n this.multiSelectItem(newItem);\n } else if (!hasKeyModifier) {\n this.selectItem(newItem);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.enter:\n case this.keys.space: {\n\n if (e.shiftKey) {\n this.multiSelectItem(item);\n } else if (e.metaKey || e.ctrlKey) {\n this.toggleItem(item);\n } else {\n this.selectItem(item);\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.left: {\n if (item.has('ul') && item.attr('aria-expanded') == 'true') {\n this.collapseGroup(item);\n } else {\n // Move up to the parent.\n var itemUL = item.parent();\n var itemParent = itemUL.parent();\n if (itemParent.is('li')) {\n itemParent.focus();\n if (e.shiftKey) {\n this.multiSelectItem(itemParent);\n } else if (!hasKeyModifier) {\n this.selectItem(itemParent);\n }\n }\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.right: {\n if (item.has('ul') && item.attr('aria-expanded') == 'false') {\n this.expandGroup(item);\n } else {\n // Move to the first item in the child group.\n newItem = item.children('ul').children('li').first();\n if (newItem.length > 0) {\n newItem.focus();\n if (e.shiftKey) {\n this.multiSelectItem(newItem);\n } else if (!hasKeyModifier) {\n this.selectItem(newItem);\n }\n }\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.up: {\n\n if (currentIndex > 0) {\n var prev = this.visibleItems.eq(currentIndex - 1);\n prev.focus();\n if (e.shiftKey) {\n this.multiSelectItem(prev);\n } else if (!hasKeyModifier) {\n this.selectItem(prev);\n }\n }\n\n e.stopPropagation();\n return false;\n }\n case this.keys.down: {\n\n if (currentIndex < this.visibleItems.length - 1) {\n var next = this.visibleItems.eq(currentIndex + 1);\n next.focus();\n if (e.shiftKey) {\n this.multiSelectItem(next);\n } else if (!hasKeyModifier) {\n this.selectItem(next);\n }\n }\n e.stopPropagation();\n return false;\n }\n case this.keys.asterisk: {\n // Expand all groups.\n this.parents.each(function() {\n thisObj.expandGroup($(this));\n });\n\n e.stopPropagation();\n return false;\n }\n case this.keys.eight: {\n if (e.shiftKey) {\n // Expand all groups.\n this.parents.each(function() {\n thisObj.expandGroup($(this));\n });\n\n e.stopPropagation();\n }\n\n return false;\n }\n }\n\n return true;\n };\n\n /**\n * Handle a key press event - ie navigate the tree.\n *\n * @method handleKeyPress\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 Tree.prototype.handleKeyPress = function(item, e) {\n if (e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) {\n // Do nothing.\n return true;\n }\n\n switch (e.keyCode) {\n case this.keys.tab: {\n return true;\n }\n case this.keys.enter:\n case this.keys.home:\n case this.keys.end:\n case this.keys.left:\n case this.keys.right:\n case this.keys.up:\n case this.keys.down: {\n e.stopPropagation();\n return false;\n }\n default : {\n var chr = String.fromCharCode(e.which);\n var match = false;\n var itemIndex = this.visibleItems.index(item);\n var itemCount = this.visibleItems.length;\n var currentIndex = itemIndex + 1;\n\n // Check if the active item was the last one on the list.\n if (currentIndex == itemCount) {\n currentIndex = 0;\n }\n\n // Iterate through the menu items (starting from the current item and wrapping) until a match is found\n // or the loop returns to the current menu item.\n while (currentIndex != itemIndex) {\n\n var currentItem = this.visibleItems.eq(currentIndex);\n var titleChr = currentItem.text().charAt(0);\n\n if (currentItem.has('ul')) {\n titleChr = currentItem.find('span').text().charAt(0);\n }\n\n if (titleChr.toLowerCase() == chr) {\n match = true;\n break;\n }\n\n currentIndex = currentIndex + 1;\n if (currentIndex == itemCount) {\n // Reached the end of the list, start again at the beginning.\n currentIndex = 0;\n }\n }\n\n if (match === true) {\n this.updateFocus(this.visibleItems.eq(currentIndex));\n }\n e.stopPropagation();\n return false;\n }\n }\n\n // eslint-disable-next-line no-unreachable\n return true;\n };\n\n /**\n * Attach an event listener to the tree.\n *\n * @method on\n * @param {String} eventname This is the name of the event to listen for. Only 'selectionchanged' is supported for now.\n * @param {Function} handler The function to call when the event is triggered.\n */\n Tree.prototype.on = function(eventname, handler) {\n if (eventname !== 'selectionchanged') {\n log.warning('Invalid custom event name for tree. Only \"selectionchanged\" is supported.');\n } else {\n this.treeRoot.on(eventname, handler);\n }\n };\n\n /**\n * Handle a double click (expand/collapse).\n *\n * @method handleDblClick\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 Tree.prototype.handleDblClick = function(item, e) {\n\n if (e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) {\n // Do nothing.\n return true;\n }\n\n // Apply the focus markup.\n this.updateFocus(item);\n\n // Expand or collapse the group.\n this.toggleGroup(item);\n\n e.stopPropagation();\n return false;\n };\n\n /**\n * Handle a click (select).\n *\n * @method handleExpandCollapseClick\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 Tree.prototype.handleExpandCollapseClick = function(item, e) {\n\n // Do not shift the focus.\n this.toggleGroup(item);\n e.stopPropagation();\n return false;\n };\n\n\n /**\n * Handle a click (select).\n *\n * @method handleClick\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 Tree.prototype.handleClick = function(item, e) {\n\n if (e.shiftKey) {\n this.multiSelectItem(item);\n } else if (e.metaKey || e.ctrlKey) {\n this.toggleItem(item);\n } else {\n this.selectItem(item);\n }\n this.updateFocus(item);\n e.stopPropagation();\n return false;\n };\n\n /**\n * Handle a blur event\n *\n * @method handleBlur\n * @param {Object} item item is the jquery id of the parent item of the group\n * @param {Event} e The event.\n * @return {Boolean}\n */\n Tree.prototype.handleBlur = function() {\n return true;\n };\n\n /**\n * Handle a focus event\n *\n * @method handleFocus\n * @param {Object} item item is 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) {\n\n this.updateFocus(item);\n\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 a dblclick handler to the parent items.\n this.parents.dblclick(function(e) {\n return thisObj.handleDblClick($(this), e);\n });\n\n // Bind a click handler.\n this.items.click(function(e) {\n return thisObj.handleClick($(this), e);\n });\n\n // Bind a toggle handler to the expand/collapse icons.\n this.items.children('img').click(function(e) {\n return thisObj.handleExpandCollapseClick($(this).parent(), e);\n });\n\n // Bind a keydown handler.\n this.items.keydown(function(e) {\n return thisObj.handleKeyDown($(this), e);\n });\n\n // Bind a keypress handler.\n this.items.keypress(function(e) {\n return thisObj.handleKeyPress($(this), e);\n });\n\n // Bind a focus handler.\n this.items.focus(function(e) {\n return thisObj.handleFocus($(this), e);\n });\n\n // Bind a blur handler.\n this.items.blur(function(e) {\n return thisObj.handleBlur($(this), e);\n });\n\n };\n\n return /** @alias module:tool_lp/tree */ Tree;\n});\n"],"file":"tree.min.js"}