init

wp-admin/js/theme-plugin-editor.js

@@ -0,0 +1,991 @@
+/* eslint no-magic-numbers: ["error", { "ignore": [-1, 0, 1] }] */
+
+if ( ! window.wp ) {
+	window.wp = {};
+}
+
+wp.themePluginEditor = (function( $ ) {
+	'use strict';
+	var component, TreeLinks;
+
+	component = {
+		l10n: {
+			lintError: {
+				singular: '',
+				plural: ''
+			},
+			saveAlert: '',
+			saveError: ''
+		},
+		codeEditor: {},
+		instance: null,
+		noticeElements: {},
+		dirty: false,
+		lintErrors: []
+	};
+
+	/**
+	 * Initialize component.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param {jQuery}         form - Form element.
+	 * @param {object}         settings - Settings.
+	 * @param {object|boolean} settings.codeEditor - Code editor settings (or `false` if syntax highlighting is disabled).
+	 * @returns {void}
+	 */
+	component.init = function init( form, settings ) {
+
+		component.form = form;
+		if ( settings ) {
+			$.extend( component, settings );
+		}
+
+		component.noticeTemplate = wp.template( 'wp-file-editor-notice' );
+		component.noticesContainer = component.form.find( '.editor-notices' );
+		component.submitButton = component.form.find( ':input[name=submit]' );
+		component.spinner = component.form.find( '.submit .spinner' );
+		component.form.on( 'submit', component.submit );
+		component.textarea = component.form.find( '#newcontent' );
+		component.textarea.on( 'change', component.onChange );
+		component.warning = $( '.file-editor-warning' );
+
+		if ( component.warning.length > 0 ) {
+			component.showWarning();
+		}
+
+		if ( false !== component.codeEditor ) {
+			/*
+			 * Defer adding notices until after DOM ready as workaround for WP Admin injecting
+			 * its own managed dismiss buttons and also to prevent the editor from showing a notice
+			 * when the file had linting errors to begin with.
+			 */
+			_.defer( function() {
+				component.initCodeEditor();
+			} );
+		}
+
+		$( component.initFileBrowser );
+
+		$( window ).on( 'beforeunload', function() {
+			if ( component.dirty ) {
+				return component.l10n.saveAlert;
+			}
+			return undefined;
+		} );
+	};
+
+	/**
+	 * Set up and display the warning modal.
+	 *
+	 * @since 4.9.0
+	 * @returns {void}
+	 */
+	component.showWarning = function() {
+		// Get the text within the modal.
+		var rawMessage = component.warning.find( '.file-editor-warning-message' ).text();
+		// Hide all the #wpwrap content from assistive technologies.
+		$( '#wpwrap' ).attr( 'aria-hidden', 'true' );
+		// Detach the warning modal from its position and append it to the body.
+		$( document.body )
+			.addClass( 'modal-open' )
+			.append( component.warning.detach() );
+		// Reveal the modal and set focus on the go back button.
+		component.warning
+			.removeClass( 'hidden' )
+			.find( '.file-editor-warning-go-back' ).focus();
+		// Get the links and buttons within the modal.
+		component.warningTabbables = component.warning.find( 'a, button' );
+		// Attach event handlers.
+		component.warningTabbables.on( 'keydown', component.constrainTabbing );
+		component.warning.on( 'click', '.file-editor-warning-dismiss', component.dismissWarning );
+		// Make screen readers announce the warning message after a short delay (necessary for some screen readers).
+		setTimeout( function() {
+			wp.a11y.speak( wp.sanitize.stripTags( rawMessage.replace( /\s+/g, ' ' ) ), 'assertive' );
+		}, 1000 );
+	};
+
+	/**
+	 * Constrain tabbing within the warning modal.
+	 *
+	 * @since 4.9.0
+	 * @param {object} event jQuery event object.
+	 * @returns {void}
+	 */
+	component.constrainTabbing = function( event ) {
+		var firstTabbable, lastTabbable;
+
+		if ( 9 !== event.which ) {
+			return;
+		}
+
+		firstTabbable = component.warningTabbables.first()[0];
+		lastTabbable = component.warningTabbables.last()[0];
+
+		if ( lastTabbable === event.target && ! event.shiftKey ) {
+			firstTabbable.focus();
+			event.preventDefault();
+		} else if ( firstTabbable === event.target && event.shiftKey ) {
+			lastTabbable.focus();
+			event.preventDefault();
+		}
+	};
+
+	/**
+	 * Dismiss the warning modal.
+	 *
+	 * @since 4.9.0
+	 * @returns {void}
+	 */
+	component.dismissWarning = function() {
+
+		wp.ajax.post( 'dismiss-wp-pointer', {
+			pointer: component.themeOrPlugin + '_editor_notice'
+		});
+
+		// Hide modal.
+		component.warning.remove();
+		$( '#wpwrap' ).removeAttr( 'aria-hidden' );
+		$( 'body' ).removeClass( 'modal-open' );
+	};
+
+	/**
+	 * Callback for when a change happens.
+	 *
+	 * @since 4.9.0
+	 * @returns {void}
+	 */
+	component.onChange = function() {
+		component.dirty = true;
+		component.removeNotice( 'file_saved' );
+	};
+
+	/**
+	 * Submit file via Ajax.
+	 *
+	 * @since 4.9.0
+	 * @param {jQuery.Event} event - Event.
+	 * @returns {void}
+	 */
+	component.submit = function( event ) {
+		var data = {}, request;
+		event.preventDefault(); // Prevent form submission in favor of Ajax below.
+		$.each( component.form.serializeArray(), function() {
+			data[ this.name ] = this.value;
+		} );
+
+		// Use value from codemirror if present.
+		if ( component.instance ) {
+			data.newcontent = component.instance.codemirror.getValue();
+		}
+
+		if ( component.isSaving ) {
+			return;
+		}
+
+		// Scroll ot the line that has the error.
+		if ( component.lintErrors.length ) {
+			component.instance.codemirror.setCursor( component.lintErrors[0].from.line );
+			return;
+		}
+
+		component.isSaving = true;
+		component.textarea.prop( 'readonly', true );
+		if ( component.instance ) {
+			component.instance.codemirror.setOption( 'readOnly', true );
+		}
+
+		component.spinner.addClass( 'is-active' );
+		request = wp.ajax.post( 'edit-theme-plugin-file', data );
+
+		// Remove previous save notice before saving.
+		if ( component.lastSaveNoticeCode ) {
+			component.removeNotice( component.lastSaveNoticeCode );
+		}
+
+		request.done( function( response ) {
+			component.lastSaveNoticeCode = 'file_saved';
+			component.addNotice({
+				code: component.lastSaveNoticeCode,
+				type: 'success',
+				message: response.message,
+				dismissible: true
+			});
+			component.dirty = false;
+		} );
+
+		request.fail( function( response ) {
+			var notice = $.extend(
+				{
+					code: 'save_error',
+					message: component.l10n.saveError
+				},
+				response,
+				{
+					type: 'error',
+					dismissible: true
+				}
+			);
+			component.lastSaveNoticeCode = notice.code;
+			component.addNotice( notice );
+		} );
+
+		request.always( function() {
+			component.spinner.removeClass( 'is-active' );
+			component.isSaving = false;
+
+			component.textarea.prop( 'readonly', false );
+			if ( component.instance ) {
+				component.instance.codemirror.setOption( 'readOnly', false );
+			}
+		} );
+	};
+
+	/**
+	 * Add notice.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param {object}   notice - Notice.
+	 * @param {string}   notice.code - Code.
+	 * @param {string}   notice.type - Type.
+	 * @param {string}   notice.message - Message.
+	 * @param {boolean}  [notice.dismissible=false] - Dismissible.
+	 * @param {Function} [notice.onDismiss] - Callback for when a user dismisses the notice.
+	 * @returns {jQuery} Notice element.
+	 */
+	component.addNotice = function( notice ) {
+		var noticeElement;
+
+		if ( ! notice.code ) {
+			throw new Error( 'Missing code.' );
+		}
+
+		// Only let one notice of a given type be displayed at a time.
+		component.removeNotice( notice.code );
+
+		noticeElement = $( component.noticeTemplate( notice ) );
+		noticeElement.hide();
+
+		noticeElement.find( '.notice-dismiss' ).on( 'click', function() {
+			component.removeNotice( notice.code );
+			if ( notice.onDismiss ) {
+				notice.onDismiss( notice );
+			}
+		} );
+
+		wp.a11y.speak( notice.message );
+
+		component.noticesContainer.append( noticeElement );
+		noticeElement.slideDown( 'fast' );
+		component.noticeElements[ notice.code ] = noticeElement;
+		return noticeElement;
+	};
+
+	/**
+	 * Remove notice.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param {string} code - Notice code.
+	 * @returns {boolean} Whether a notice was removed.
+	 */
+	component.removeNotice = function( code ) {
+		if ( component.noticeElements[ code ] ) {
+			component.noticeElements[ code ].slideUp( 'fast', function() {
+				$( this ).remove();
+			} );
+			delete component.noticeElements[ code ];
+			return true;
+		}
+		return false;
+	};
+
+	/**
+	 * Initialize code editor.
+	 *
+	 * @since 4.9.0
+	 * @returns {void}
+	 */
+	component.initCodeEditor = function initCodeEditor() {
+		var codeEditorSettings, editor;
+
+		codeEditorSettings = $.extend( {}, component.codeEditor );
+
+		/**
+		 * Handle tabbing to the field before the editor.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @returns {void}
+		 */
+		codeEditorSettings.onTabPrevious = function() {
+			$( '#templateside' ).find( ':tabbable' ).last().focus();
+		};
+
+		/**
+		 * Handle tabbing to the field after the editor.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @returns {void}
+		 */
+		codeEditorSettings.onTabNext = function() {
+			$( '#template' ).find( ':tabbable:not(.CodeMirror-code)' ).first().focus();
+		};
+
+		/**
+		 * Handle change to the linting errors.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @param {Array} errors - List of linting errors.
+		 * @returns {void}
+		 */
+		codeEditorSettings.onChangeLintingErrors = function( errors ) {
+			component.lintErrors = errors;
+
+			// Only disable the button in onUpdateErrorNotice when there are errors so users can still feel they can click the button.
+			if ( 0 === errors.length ) {
+				component.submitButton.toggleClass( 'disabled', false );
+			}
+		};
+
+		/**
+		 * Update error notice.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @param {Array} errorAnnotations - Error annotations.
+		 * @returns {void}
+		 */
+		codeEditorSettings.onUpdateErrorNotice = function onUpdateErrorNotice( errorAnnotations ) {
+			var message, noticeElement;
+
+			component.submitButton.toggleClass( 'disabled', errorAnnotations.length > 0 );
+
+			if ( 0 !== errorAnnotations.length ) {
+				if ( 1 === errorAnnotations.length ) {
+					message = component.l10n.lintError.singular.replace( '%d', '1' );
+				} else {
+					message = component.l10n.lintError.plural.replace( '%d', String( errorAnnotations.length ) );
+				}
+				noticeElement = component.addNotice({
+					code: 'lint_errors',
+					type: 'error',
+					message: message,
+					dismissible: false
+				});
+				noticeElement.find( 'input[type=checkbox]' ).on( 'click', function() {
+					codeEditorSettings.onChangeLintingErrors( [] );
+					component.removeNotice( 'lint_errors' );
+				} );
+			} else {
+				component.removeNotice( 'lint_errors' );
+			}
+		};
+
+		editor = wp.codeEditor.initialize( $( '#newcontent' ), codeEditorSettings );
+		editor.codemirror.on( 'change', component.onChange );
+
+		// Improve the editor accessibility.
+		$( editor.codemirror.display.lineDiv )
+			.attr({
+				role: 'textbox',
+				'aria-multiline': 'true',
+				'aria-labelledby': 'theme-plugin-editor-label',
+				'aria-describedby': 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4'
+			});
+
+		// Focus the editor when clicking on its label.
+		$( '#theme-plugin-editor-label' ).on( 'click', function() {
+			editor.codemirror.focus();
+		});
+
+		component.instance = editor;
+	};
+
+	/**
+	 * Initialization of the file browser's folder states.
+	 *
+	 * @since 4.9.0
+	 * @returns {void}
+	 */
+	component.initFileBrowser = function initFileBrowser() {
+
+		var $templateside = $( '#templateside' );
+
+		// Collapse all folders.
+		$templateside.find( '[role="group"]' ).parent().attr( 'aria-expanded', false );
+
+		// Expand ancestors to the current file.
+		$templateside.find( '.notice' ).parents( '[aria-expanded]' ).attr( 'aria-expanded', true );
+
+		// Find Tree elements and enhance them.
+		$templateside.find( '[role="tree"]' ).each( function() {
+			var treeLinks = new TreeLinks( this );
+			treeLinks.init();
+		} );
+
+		// Scroll the current file into view.
+		$templateside.find( '.current-file:first' ).each( function() {
+			if ( this.scrollIntoViewIfNeeded ) {
+				this.scrollIntoViewIfNeeded();
+			} else {
+				this.scrollIntoView( false );
+			}
+		} );
+	};
+
+	/* jshint ignore:start */
+	/* jscs:disable */
+	/* eslint-disable */
+
+	/**
+	 * Creates a new TreeitemLink.
+	 *
+	 * @since 4.9.0
+	 * @class
+	 * @private
+	 * @see {@link https://www.w3.org/TR/wai-aria-practices-1.1/examples/treeview/treeview-2/treeview-2b.html|W3C Treeview Example}
+	 * @license W3C-20150513
+	 */
+	var TreeitemLink = (function () {
+		/**
+		 *   This content is licensed according to the W3C Software License at
+		 *   https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
+		 *
+		 *   File:   TreeitemLink.js
+		 *
+		 *   Desc:   Treeitem widget that implements ARIA Authoring Practices
+		 *           for a tree being used as a file viewer
+		 *
+		 *   Author: Jon Gunderson, Ku Ja Eun and Nicholas Hoyt
+		 */
+
+		/**
+		 *   @constructor
+		 *
+		 *   @desc
+		 *       Treeitem object for representing the state and user interactions for a
+		 *       treeItem widget
+		 *
+		 *   @param node
+		 *       An element with the role=tree attribute
+		 */
+
+		var TreeitemLink = function (node, treeObj, group) {
+
+			// Check whether node is a DOM element
+			if (typeof node !== 'object') {
+				return;
+			}
+
+			node.tabIndex = -1;
+			this.tree = treeObj;
+			this.groupTreeitem = group;
+			this.domNode = node;
+			this.label = node.textContent.trim();
+			this.stopDefaultClick = false;
+
+			if (node.getAttribute('aria-label')) {
+				this.label = node.getAttribute('aria-label').trim();
+			}
+
+			this.isExpandable = false;
+			this.isVisible = false;
+			this.inGroup = false;
+
+			if (group) {
+				this.inGroup = true;
+			}
+
+			var elem = node.firstElementChild;
+
+			while (elem) {
+
+				if (elem.tagName.toLowerCase() == 'ul') {
+					elem.setAttribute('role', 'group');
+					this.isExpandable = true;
+					break;
+				}
+
+				elem = elem.nextElementSibling;
+			}
+
+			this.keyCode = Object.freeze({
+				RETURN: 13,
+				SPACE: 32,
+				PAGEUP: 33,
+				PAGEDOWN: 34,
+				END: 35,
+				HOME: 36,
+				LEFT: 37,
+				UP: 38,
+				RIGHT: 39,
+				DOWN: 40
+			});
+		};
+
+		TreeitemLink.prototype.init = function () {
+			this.domNode.tabIndex = -1;
+
+			if (!this.domNode.getAttribute('role')) {
+				this.domNode.setAttribute('role', 'treeitem');
+			}
+
+			this.domNode.addEventListener('keydown', this.handleKeydown.bind(this));
+			this.domNode.addEventListener('click', this.handleClick.bind(this));
+			this.domNode.addEventListener('focus', this.handleFocus.bind(this));
+			this.domNode.addEventListener('blur', this.handleBlur.bind(this));
+
+			if (this.isExpandable) {
+				this.domNode.firstElementChild.addEventListener('mouseover', this.handleMouseOver.bind(this));
+				this.domNode.firstElementChild.addEventListener('mouseout', this.handleMouseOut.bind(this));
+			}
+			else {
+				this.domNode.addEventListener('mouseover', this.handleMouseOver.bind(this));
+				this.domNode.addEventListener('mouseout', this.handleMouseOut.bind(this));
+			}
+		};
+
+		TreeitemLink.prototype.isExpanded = function () {
+
+			if (this.isExpandable) {
+				return this.domNode.getAttribute('aria-expanded') === 'true';
+			}
+
+			return false;
+
+		};
+
+		/* EVENT HANDLERS */
+
+		TreeitemLink.prototype.handleKeydown = function (event) {
+			var tgt = event.currentTarget,
+				flag = false,
+				_char = event.key,
+				clickEvent;
+
+			function isPrintableCharacter(str) {
+				return str.length === 1 && str.match(/\S/);
+			}
+
+			function printableCharacter(item) {
+				if (_char == '*') {
+					item.tree.expandAllSiblingItems(item);
+					flag = true;
+				}
+				else {
+					if (isPrintableCharacter(_char)) {
+						item.tree.setFocusByFirstCharacter(item, _char);
+						flag = true;
+					}
+				}
+			}
+
+			this.stopDefaultClick = false;
+
+			if (event.altKey || event.ctrlKey || event.metaKey) {
+				return;
+			}
+
+			if (event.shift) {
+				if (event.keyCode == this.keyCode.SPACE || event.keyCode == this.keyCode.RETURN) {
+					event.stopPropagation();
+					this.stopDefaultClick = true;
+				}
+				else {
+					if (isPrintableCharacter(_char)) {
+						printableCharacter(this);
+					}
+				}
+			}
+			else {
+				switch (event.keyCode) {
+					case this.keyCode.SPACE:
+					case this.keyCode.RETURN:
+						if (this.isExpandable) {
+							if (this.isExpanded()) {
+								this.tree.collapseTreeitem(this);
+							}
+							else {
+								this.tree.expandTreeitem(this);
+							}
+							flag = true;
+						}
+						else {
+							event.stopPropagation();
+							this.stopDefaultClick = true;
+						}
+						break;
+
+					case this.keyCode.UP:
+						this.tree.setFocusToPreviousItem(this);
+						flag = true;
+						break;
+
+					case this.keyCode.DOWN:
+						this.tree.setFocusToNextItem(this);
+						flag = true;
+						break;
+
+					case this.keyCode.RIGHT:
+						if (this.isExpandable) {
+							if (this.isExpanded()) {
+								this.tree.setFocusToNextItem(this);
+							}
+							else {
+								this.tree.expandTreeitem(this);
+							}
+						}
+						flag = true;
+						break;
+
+					case this.keyCode.LEFT:
+						if (this.isExpandable && this.isExpanded()) {
+							this.tree.collapseTreeitem(this);
+							flag = true;
+						}
+						else {
+							if (this.inGroup) {
+								this.tree.setFocusToParentItem(this);
+								flag = true;
+							}
+						}
+						break;
+
+					case this.keyCode.HOME:
+						this.tree.setFocusToFirstItem();
+						flag = true;
+						break;
+
+					case this.keyCode.END:
+						this.tree.setFocusToLastItem();
+						flag = true;
+						break;
+
+					default:
+						if (isPrintableCharacter(_char)) {
+							printableCharacter(this);
+						}
+						break;
+				}
+			}
+
+			if (flag) {
+				event.stopPropagation();
+				event.preventDefault();
+			}
+		};
+
+		TreeitemLink.prototype.handleClick = function (event) {
+
+			// only process click events that directly happened on this treeitem
+			if (event.target !== this.domNode && event.target !== this.domNode.firstElementChild) {
+				return;
+			}
+
+			if (this.isExpandable) {
+				if (this.isExpanded()) {
+					this.tree.collapseTreeitem(this);
+				}
+				else {
+					this.tree.expandTreeitem(this);
+				}
+				event.stopPropagation();
+			}
+		};
+
+		TreeitemLink.prototype.handleFocus = function (event) {
+			var node = this.domNode;
+			if (this.isExpandable) {
+				node = node.firstElementChild;
+			}
+			node.classList.add('focus');
+		};
+
+		TreeitemLink.prototype.handleBlur = function (event) {
+			var node = this.domNode;
+			if (this.isExpandable) {
+				node = node.firstElementChild;
+			}
+			node.classList.remove('focus');
+		};
+
+		TreeitemLink.prototype.handleMouseOver = function (event) {
+			event.currentTarget.classList.add('hover');
+		};
+
+		TreeitemLink.prototype.handleMouseOut = function (event) {
+			event.currentTarget.classList.remove('hover');
+		};
+
+		return TreeitemLink;
+	})();
+
+	/**
+	 * Creates a new TreeLinks.
+	 *
+	 * @since 4.9.0
+	 * @class
+	 * @private
+	 * @see {@link https://www.w3.org/TR/wai-aria-practices-1.1/examples/treeview/treeview-2/treeview-2b.html|W3C Treeview Example}
+	 * @license W3C-20150513
+	 */
+	TreeLinks = (function () {
+		/*
+		 *   This content is licensed according to the W3C Software License at
+		 *   https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
+		 *
+		 *   File:   TreeLinks.js
+		 *
+		 *   Desc:   Tree widget that implements ARIA Authoring Practices
+		 *           for a tree being used as a file viewer
+		 *
+		 *   Author: Jon Gunderson, Ku Ja Eun and Nicholas Hoyt
+		 */
+
+		/*
+		 *   @constructor
+		 *
+		 *   @desc
+		 *       Tree item object for representing the state and user interactions for a
+		 *       tree widget
+		 *
+		 *   @param node
+		 *       An element with the role=tree attribute
+		 */
+
+		var TreeLinks = function (node) {
+			// Check whether node is a DOM element
+			if (typeof node !== 'object') {
+				return;
+			}
+
+			this.domNode = node;
+
+			this.treeitems = [];
+			this.firstChars = [];
+
+			this.firstTreeitem = null;
+			this.lastTreeitem = null;
+
+		};
+
+		TreeLinks.prototype.init = function () {
+
+			function findTreeitems(node, tree, group) {
+
+				var elem = node.firstElementChild;
+				var ti = group;
+
+				while (elem) {
+
+					if ((elem.tagName.toLowerCase() === 'li' && elem.firstElementChild.tagName.toLowerCase() === 'span') || elem.tagName.toLowerCase() === 'a') {
+						ti = new TreeitemLink(elem, tree, group);
+						ti.init();
+						tree.treeitems.push(ti);
+						tree.firstChars.push(ti.label.substring(0, 1).toLowerCase());
+					}
+
+					if (elem.firstElementChild) {
+						findTreeitems(elem, tree, ti);
+					}
+
+					elem = elem.nextElementSibling;
+				}
+			}
+
+			// initialize pop up menus
+			if (!this.domNode.getAttribute('role')) {
+				this.domNode.setAttribute('role', 'tree');
+			}
+
+			findTreeitems(this.domNode, this, false);
+
+			this.updateVisibleTreeitems();
+
+			this.firstTreeitem.domNode.tabIndex = 0;
+
+		};
+
+		TreeLinks.prototype.setFocusToItem = function (treeitem) {
+
+			for (var i = 0; i < this.treeitems.length; i++) {
+				var ti = this.treeitems[i];
+
+				if (ti === treeitem) {
+					ti.domNode.tabIndex = 0;
+					ti.domNode.focus();
+				}
+				else {
+					ti.domNode.tabIndex = -1;
+				}
+			}
+
+		};
+
+		TreeLinks.prototype.setFocusToNextItem = function (currentItem) {
+
+			var nextItem = false;
+
+			for (var i = (this.treeitems.length - 1); i >= 0; i--) {
+				var ti = this.treeitems[i];
+				if (ti === currentItem) {
+					break;
+				}
+				if (ti.isVisible) {
+					nextItem = ti;
+				}
+			}
+
+			if (nextItem) {
+				this.setFocusToItem(nextItem);
+			}
+
+		};
+
+		TreeLinks.prototype.setFocusToPreviousItem = function (currentItem) {
+
+			var prevItem = false;
+
+			for (var i = 0; i < this.treeitems.length; i++) {
+				var ti = this.treeitems[i];
+				if (ti === currentItem) {
+					break;
+				}
+				if (ti.isVisible) {
+					prevItem = ti;
+				}
+			}
+
+			if (prevItem) {
+				this.setFocusToItem(prevItem);
+			}
+		};
+
+		TreeLinks.prototype.setFocusToParentItem = function (currentItem) {
+
+			if (currentItem.groupTreeitem) {
+				this.setFocusToItem(currentItem.groupTreeitem);
+			}
+		};
+
+		TreeLinks.prototype.setFocusToFirstItem = function () {
+			this.setFocusToItem(this.firstTreeitem);
+		};
+
+		TreeLinks.prototype.setFocusToLastItem = function () {
+			this.setFocusToItem(this.lastTreeitem);
+		};
+
+		TreeLinks.prototype.expandTreeitem = function (currentItem) {
+
+			if (currentItem.isExpandable) {
+				currentItem.domNode.setAttribute('aria-expanded', true);
+				this.updateVisibleTreeitems();
+			}
+
+		};
+
+		TreeLinks.prototype.expandAllSiblingItems = function (currentItem) {
+			for (var i = 0; i < this.treeitems.length; i++) {
+				var ti = this.treeitems[i];
+
+				if ((ti.groupTreeitem === currentItem.groupTreeitem) && ti.isExpandable) {
+					this.expandTreeitem(ti);
+				}
+			}
+
+		};
+
+		TreeLinks.prototype.collapseTreeitem = function (currentItem) {
+
+			var groupTreeitem = false;
+
+			if (currentItem.isExpanded()) {
+				groupTreeitem = currentItem;
+			}
+			else {
+				groupTreeitem = currentItem.groupTreeitem;
+			}
+
+			if (groupTreeitem) {
+				groupTreeitem.domNode.setAttribute('aria-expanded', false);
+				this.updateVisibleTreeitems();
+				this.setFocusToItem(groupTreeitem);
+			}
+
+		};
+
+		TreeLinks.prototype.updateVisibleTreeitems = function () {
+
+			this.firstTreeitem = this.treeitems[0];
+
+			for (var i = 0; i < this.treeitems.length; i++) {
+				var ti = this.treeitems[i];
+
+				var parent = ti.domNode.parentNode;
+
+				ti.isVisible = true;
+
+				while (parent && (parent !== this.domNode)) {
+
+					if (parent.getAttribute('aria-expanded') == 'false') {
+						ti.isVisible = false;
+					}
+					parent = parent.parentNode;
+				}
+
+				if (ti.isVisible) {
+					this.lastTreeitem = ti;
+				}
+			}
+
+		};
+
+		TreeLinks.prototype.setFocusByFirstCharacter = function (currentItem, _char) {
+			var start, index;
+			_char = _char.toLowerCase();
+
+			// Get start index for search based on position of currentItem
+			start = this.treeitems.indexOf(currentItem) + 1;
+			if (start === this.treeitems.length) {
+				start = 0;
+			}
+
+			// Check remaining slots in the menu
+			index = this.getIndexFirstChars(start, _char);
+
+			// If not found in remaining slots, check from beginning
+			if (index === -1) {
+				index = this.getIndexFirstChars(0, _char);
+			}
+
+			// If match was found...
+			if (index > -1) {
+				this.setFocusToItem(this.treeitems[index]);
+			}
+		};
+
+		TreeLinks.prototype.getIndexFirstChars = function (startIndex, _char) {
+			for (var i = startIndex; i < this.firstChars.length; i++) {
+				if (this.treeitems[i].isVisible) {
+					if (_char === this.firstChars[i]) {
+						return i;
+					}
+				}
+			}
+			return -1;
+		};
+
+		return TreeLinks;
+	})();
+
+	/* jshint ignore:end */
+	/* jscs:enable */
+	/* eslint-enable */
+
+	return component;
+})( jQuery );