Project import generated by Copybara.
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+/**
+ * @license
+ * Copyright 2016 Leif Olsen. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This code is built with Google Material Design Lite,
+ * which is Licensed under the Apache License, Version 2.0
+ */
+
+/**
+ * A WAI-ARIA friendly accordion component.
+ * An accordion is a collection of expandable panels associated with a common outer container. Panels consist
+ * of a header and an associated content region or tabpanel. The primary use of an Accordion is to present multiple sections
+ * of content on a single page without scrolling, where all of the sections are peers in the application or object hierarchy.
+ * The general look is similar to a tree where each root tree node is an expandable accordion header. The user navigates
+ * and makes the contents of each panel visible (or not) by interacting with the Accordion Header
+ */
+
+import {
+ VK_ENTER,
+ VK_SPACE,
+ VK_END,
+ VK_HOME,
+ VK_ARROW_LEFT,
+ VK_ARROW_UP,
+ VK_ARROW_RIGHT,
+ VK_ARROW_DOWN,
+ IS_EXPANDED,
+ IS_UPGRADED,
+ ARIA_MULTISELECTABLE,
+ ARIA_EXPANDED,
+ ARIA_HIDDEN,
+ ARIA_SELECTED
+} from '../utils/constants';
+
+
+(function() {
+ 'use strict';
+ const ACCORDION = 'mdlext-accordion';
+ const ACCORDION_VERTICAL = 'mdlext-accordion--vertical';
+ const ACCORDION_HORIZONTAL = 'mdlext-accordion--horizontal';
+ const PANEL = 'mdlext-accordion__panel';
+ const PANEL_ROLE = 'presentation';
+ const TAB = 'mdlext-accordion__tab';
+ const TAB_CAPTION = 'mdlext-accordion__tab__caption';
+ const TAB_ROLE = 'tab';
+ const TABPANEL = 'mdlext-accordion__tabpanel';
+ const TABPANEL_ROLE = 'tabpanel';
+ const RIPPLE_EFFECT = 'mdlext-js-ripple-effect';
+ const RIPPLE = 'mdlext-accordion__tab--ripple';
+ const ANIMATION_EFFECT = 'mdlext-js-animation-effect';
+ const ANIMATION = 'mdlext-accordion__tabpanel--animation';
+
+ /**
+ * @constructor
+ * @param {Element} element The element that will be upgraded.
+ */
+ const MaterialExtAccordion = function MaterialExtAccordion( element ) {
+
+ // Stores the Accordion HTML element.
+ this.element_ = element;
+
+ // Initialize instance.
+ this.init();
+ };
+ window['MaterialExtAccordion'] = MaterialExtAccordion;
+
+
+ // Helpers
+ const accordionPanelElements = ( element ) => {
+ if(!element) {
+ return {
+ panel: null,
+ tab: null,
+ tabpanel: null
+ };
+ }
+ else if (element.classList.contains(PANEL)) {
+ return {
+ panel: element,
+ tab: element.querySelector(`.${TAB}`),
+ tabpanel: element.querySelector(`.${TABPANEL}`)
+ };
+ }
+ else {
+ return {
+ panel: element.parentNode,
+ tab: element.parentNode.querySelector(`.${TAB}`),
+ tabpanel: element.parentNode.querySelector(`.${TABPANEL}`)
+ };
+ }
+ };
+
+
+ // Private methods.
+
+ /**
+ * Handles custom command event, 'open', 'close', 'toggle' or upgrade
+ * @param event. A custom event
+ * @private
+ */
+ MaterialExtAccordion.prototype.commandHandler_ = function( event ) {
+ event.preventDefault();
+ event.stopPropagation();
+
+ if(event && event.detail) {
+ this.command(event.detail);
+ }
+ };
+
+ /**
+ * Dispatch toggle event
+ * @param {string} state
+ * @param {Element} tab
+ * @param {Element} tabpanel
+ * @private
+ */
+ MaterialExtAccordion.prototype.dispatchToggleEvent_ = function ( state, tab, tabpanel ) {
+ const ce = new CustomEvent('toggle', {
+ bubbles: true,
+ cancelable: true,
+ detail: { state: state, tab: tab, tabpanel: tabpanel }
+ });
+ this.element_.dispatchEvent(ce);
+ };
+
+ /**
+ * Open tab
+ * @param {Element} panel
+ * @param {Element} tab
+ * @param {Element} tabpanel
+ * @private
+ */
+ MaterialExtAccordion.prototype.openTab_ = function( panel, tab, tabpanel ) {
+ panel.classList.add(IS_EXPANDED);
+ tab.setAttribute(ARIA_EXPANDED, 'true');
+ tabpanel.removeAttribute('hidden');
+ tabpanel.setAttribute(ARIA_HIDDEN, 'false');
+ this.dispatchToggleEvent_('open', tab, tabpanel);
+ };
+
+ /**
+ * Close tab
+ * @param {Element} panel
+ * @param {Element} tab
+ * @param {Element} tabpanel
+ * @private
+ */
+ MaterialExtAccordion.prototype.closeTab_ = function( panel, tab, tabpanel ) {
+ panel.classList.remove(IS_EXPANDED);
+ tab.setAttribute(ARIA_EXPANDED, 'false');
+ tabpanel.setAttribute('hidden', '');
+ tabpanel.setAttribute(ARIA_HIDDEN, 'true');
+ this.dispatchToggleEvent_('close', tab, tabpanel);
+ };
+
+ /**
+ * Toggle tab
+ * @param {Element} panel
+ * @param {Element} tab
+ * @param {Element} tabpanel
+ * @private
+ */
+ MaterialExtAccordion.prototype.toggleTab_ = function( panel, tab, tabpanel ) {
+ if( !(this.element_.hasAttribute('disabled') || tab.hasAttribute('disabled')) ) {
+ if (tab.getAttribute(ARIA_EXPANDED).toLowerCase() === 'true') {
+ this.closeTab_(panel, tab, tabpanel);
+ }
+ else {
+ if (this.element_.getAttribute(ARIA_MULTISELECTABLE).toLowerCase() !== 'true') {
+ this.closeTabs_();
+ }
+ this.openTab_(panel, tab, tabpanel);
+ }
+ }
+ };
+
+ /**
+ * Open tabs
+ * @private
+ */
+ MaterialExtAccordion.prototype.openTabs_ = function() {
+ if (this.element_.getAttribute(ARIA_MULTISELECTABLE).toLowerCase() === 'true') {
+ [...this.element_.querySelectorAll(`.${ACCORDION} > .${PANEL}`)]
+ .filter(panel => !panel.classList.contains(IS_EXPANDED))
+ .forEach(closedItem => {
+ const tab = closedItem.querySelector(`.${TAB}`);
+ if (!tab.hasAttribute('disabled')) {
+ this.openTab_(closedItem, tab, closedItem.querySelector(`.${TABPANEL}`));
+ }
+ });
+ }
+ };
+
+ /**
+ * Close tabs
+ * @private
+ */
+ MaterialExtAccordion.prototype.closeTabs_ = function() {
+ [...this.element_.querySelectorAll(`.${ACCORDION} > .${PANEL}.${IS_EXPANDED}`)]
+ .forEach( panel => {
+ const tab = panel.querySelector(`.${TAB}`);
+ if(!tab.hasAttribute('disabled')) {
+ this.closeTab_(panel, tab, panel.querySelector(`.${TABPANEL}`));
+ }
+ });
+ };
+
+
+ // Public methods.
+
+ /**
+ * Upgrade an individual accordion tab
+ * @public
+ * @param {Element} tabElement The HTML element for the accordion panel.
+ */
+ MaterialExtAccordion.prototype.upgradeTab = function( tabElement ) {
+
+ const { panel, tab, tabpanel } = accordionPanelElements( tabElement );
+
+ const disableTab = () => {
+ panel.classList.remove(IS_EXPANDED);
+ tab.setAttribute('tabindex', '-1');
+ tab.setAttribute(ARIA_EXPANDED, 'false');
+ tabpanel.setAttribute('hidden', '');
+ tabpanel.setAttribute(ARIA_HIDDEN, 'true');
+ };
+
+ const enableTab = () => {
+ if(!tab.hasAttribute(ARIA_EXPANDED)) {
+ tab.setAttribute(ARIA_EXPANDED, 'false');
+ }
+
+ tab.setAttribute('tabindex', '0');
+
+ if(tab.getAttribute(ARIA_EXPANDED).toLowerCase() === 'true') {
+ panel.classList.add(IS_EXPANDED);
+ tabpanel.removeAttribute('hidden');
+ tabpanel.setAttribute(ARIA_HIDDEN, 'false');
+ }
+ else {
+ panel.classList.remove(IS_EXPANDED);
+ tabpanel.setAttribute('hidden', '');
+ tabpanel.setAttribute(ARIA_HIDDEN, 'true');
+ }
+ };
+
+ // In horizontal layout, caption must have a max-width defined to prevent pushing elements to the right of the caption out of view.
+ // In JsDom, offsetWidth and offsetHeight properties do not work, so this function is not testable.
+ /* istanbul ignore next */
+ const calcMaxTabCaptionWidth = () => {
+
+ const tabCaption = tab.querySelector(`.${TAB_CAPTION}`);
+ if(tabCaption !== null) {
+ const w = [...tab.children]
+ .filter( el => el.classList && !el.classList.contains(TAB_CAPTION) )
+ .reduce( (v, el) => v + el.offsetWidth, 0 );
+
+ const maxWidth = tab.clientHeight - w;
+ if(maxWidth > 0) {
+ tabCaption.style['max-width'] = `${maxWidth}px`;
+ }
+ }
+ };
+
+ const selectTab = () => {
+ if( !tab.hasAttribute(ARIA_SELECTED) ) {
+ [...this.element_.querySelectorAll(`.${TAB}[aria-selected="true"]`)].forEach(
+ selectedTab => selectedTab.removeAttribute(ARIA_SELECTED)
+ );
+ tab.setAttribute(ARIA_SELECTED, 'true');
+ }
+ };
+
+ const tabClickHandler = () => {
+ this.toggleTab_(panel, tab, tabpanel);
+ selectTab();
+ };
+
+ const tabFocusHandler = () => {
+ selectTab();
+ };
+
+ const tabpanelClickHandler = () => {
+ selectTab();
+ };
+
+ const tabpanelFocusHandler = () => {
+ selectTab();
+ };
+
+ const tabKeydownHandler = e => {
+
+ if(this.element_.hasAttribute('disabled')) {
+ return;
+ }
+
+ if ( e.keyCode === VK_END || e.keyCode === VK_HOME
+ || e.keyCode === VK_ARROW_UP || e.keyCode === VK_ARROW_LEFT
+ || e.keyCode === VK_ARROW_DOWN || e.keyCode === VK_ARROW_RIGHT ) {
+
+ let nextTab = null;
+ let keyCode = e.keyCode;
+
+ if (keyCode === VK_HOME) {
+ nextTab = this.element_.querySelector(`.${PANEL}:first-child > .${TAB}`);
+ if(nextTab && nextTab.hasAttribute('disabled')) {
+ nextTab = null;
+ keyCode = VK_ARROW_DOWN;
+ }
+ }
+ else if (keyCode === VK_END) {
+ nextTab = this.element_.querySelector(`.${PANEL}:last-child > .${TAB}`);
+ if(nextTab && nextTab.hasAttribute('disabled')) {
+ nextTab = null;
+ keyCode = VK_ARROW_UP;
+ }
+ }
+
+ if(!nextTab) {
+ let nextPanel = panel;
+
+ do {
+ if (keyCode === VK_ARROW_UP || keyCode === VK_ARROW_LEFT) {
+ nextPanel = nextPanel.previousElementSibling;
+ if(!nextPanel) {
+ nextPanel = this.element_.querySelector(`.${PANEL}:last-child`);
+ }
+ if (nextPanel) {
+ nextTab = nextPanel.querySelector(`.${PANEL} > .${TAB}`);
+ }
+ }
+ else if (keyCode === VK_ARROW_DOWN || keyCode === VK_ARROW_RIGHT) {
+ nextPanel = nextPanel.nextElementSibling;
+ if(!nextPanel) {
+ nextPanel = this.element_.querySelector(`.${PANEL}:first-child`);
+ }
+ if (nextPanel) {
+ nextTab = nextPanel.querySelector(`.${PANEL} > .${TAB}`);
+ }
+ }
+
+ if(nextTab && nextTab.hasAttribute('disabled')) {
+ nextTab = null;
+ }
+ else {
+ break;
+ }
+ }
+ while(nextPanel !== panel);
+ }
+
+ if (nextTab) {
+ e.preventDefault();
+ e.stopPropagation();
+ nextTab.focus();
+
+ // Workaround for JSDom testing:
+ // In JsDom 'element.focus()' does not trigger any focus event
+ if(!nextTab.hasAttribute(ARIA_SELECTED)) {
+
+ [...this.element_.querySelectorAll(`.${TAB}[aria-selected="true"]`)]
+ .forEach( selectedTab => selectedTab.removeAttribute(ARIA_SELECTED) );
+
+ nextTab.setAttribute(ARIA_SELECTED, 'true');
+ }
+ }
+ }
+ else if (e.keyCode === VK_ENTER || e.keyCode === VK_SPACE) {
+ e.preventDefault();
+ e.stopPropagation();
+ this.toggleTab_(panel, tab, tabpanel);
+ }
+ };
+
+ if(tab === null) {
+ throw new Error('There must be a tab element for each accordion panel.');
+ }
+
+ if(tabpanel === null) {
+ throw new Error('There must be a tabpanel element for each accordion panel.');
+ }
+
+ panel.setAttribute('role', PANEL_ROLE);
+ tab.setAttribute('role', TAB_ROLE);
+ tabpanel.setAttribute('role', TABPANEL_ROLE);
+
+ if(tab.hasAttribute('disabled')) {
+ disableTab();
+ }
+ else {
+ enableTab();
+ }
+
+ if( this.element_.classList.contains(ACCORDION_HORIZONTAL)) {
+ calcMaxTabCaptionWidth();
+ }
+
+ if (this.element_.classList.contains(RIPPLE_EFFECT)) {
+ tab.classList.add(RIPPLE);
+ }
+
+ if (this.element_.classList.contains(ANIMATION_EFFECT)) {
+ tabpanel.classList.add(ANIMATION);
+ }
+
+ // Remove listeners, just in case ...
+ tab.removeEventListener('click', tabClickHandler);
+ tab.removeEventListener('focus', tabFocusHandler);
+ tab.removeEventListener('keydown', tabKeydownHandler);
+ tabpanel.removeEventListener('click', tabpanelClickHandler);
+ tabpanel.removeEventListener('focus', tabpanelFocusHandler);
+
+ tab.addEventListener('click', tabClickHandler);
+ tab.addEventListener('focus', tabFocusHandler);
+ tab.addEventListener('keydown', tabKeydownHandler);
+ tabpanel.addEventListener('click', tabpanelClickHandler, true);
+ tabpanel.addEventListener('focus', tabpanelFocusHandler, true);
+ };
+ MaterialExtAccordion.prototype['upgradeTab'] = MaterialExtAccordion.prototype.upgradeTab;
+
+
+ /**
+ * Execute command
+ * @param detail
+ */
+ MaterialExtAccordion.prototype.command = function( detail ) {
+
+ const openTab = tabElement => {
+
+ if(tabElement === undefined) {
+ this.openTabs_();
+ }
+ else if(tabElement !== null) {
+ const { panel, tab, tabpanel } = accordionPanelElements( tabElement );
+ if(tab.getAttribute(ARIA_EXPANDED).toLowerCase() !== 'true') {
+ this.toggleTab_(panel, tab, tabpanel);
+ }
+ }
+ };
+
+ const closeTab = tabElement => {
+ if(tabElement === undefined) {
+ this.closeTabs_();
+ }
+ else if(tabElement !== null) {
+ const { panel, tab, tabpanel } = accordionPanelElements( tabElement );
+
+ if(tab.getAttribute(ARIA_EXPANDED).toLowerCase() === 'true') {
+ this.toggleTab_(panel, tab, tabpanel);
+ }
+ }
+ };
+
+ const toggleTab = tabElement => {
+ if(tabElement) {
+ const { panel, tab, tabpanel } = accordionPanelElements( tabElement );
+ this.toggleTab_(panel, tab, tabpanel);
+ }
+ };
+
+
+ if(detail && detail.action) {
+ const { action, target } = detail;
+
+ switch (action.toLowerCase()) {
+ case 'open':
+ openTab(target);
+ break;
+ case 'close':
+ closeTab(target);
+ break;
+ case 'toggle':
+ toggleTab(target);
+ break;
+ case 'upgrade':
+ if(target) {
+ this.upgradeTab(target);
+ }
+ break;
+ default:
+ throw new Error(`Unknown action "${action}". Action must be one of "open", "close", "toggle" or "upgrade"`);
+ }
+ }
+ };
+ MaterialExtAccordion.prototype['command'] = MaterialExtAccordion.prototype.command;
+
+
+ /**
+ * Initialize component
+ */
+ MaterialExtAccordion.prototype.init = function() {
+ if (this.element_) {
+ // Do the init required for this component to work
+ if( !(this.element_.classList.contains(ACCORDION_HORIZONTAL) || this.element_.classList.contains(ACCORDION_VERTICAL))) {
+ throw new Error(`Accordion must have one of the classes "${ACCORDION_HORIZONTAL}" or "${ACCORDION_VERTICAL}"`);
+ }
+
+ this.element_.setAttribute('role', 'tablist');
+
+ if(!this.element_.hasAttribute(ARIA_MULTISELECTABLE)) {
+ this.element_.setAttribute(ARIA_MULTISELECTABLE, 'false');
+ }
+
+ this.element_.removeEventListener('command', this.commandHandler_);
+ this.element_.addEventListener('command', this.commandHandler_.bind(this), false);
+
+ [...this.element_.querySelectorAll(`.${ACCORDION} > .${PANEL}`)].forEach( panel => this.upgradeTab(panel) );
+
+ // Set upgraded flag
+ this.element_.classList.add(IS_UPGRADED);
+ }
+ };
+
+
+ /*
+ * Downgrade component
+ * E.g remove listeners and clean up resources
+ *
+ * Nothing to downgrade
+ *
+ MaterialExtAccordion.prototype.mdlDowngrade_ = function() {
+ 'use strict';
+ console.log('***** MaterialExtAccordion.mdlDowngrade');
+ };
+ */
+
+
+ // The component registers itself. It can assume componentHandler is available
+ // in the global scope.
+ /* eslint no-undef: 0 */
+ componentHandler.register({
+ constructor: MaterialExtAccordion,
+ classAsString: 'MaterialExtAccordion',
+ cssClass: 'mdlext-js-accordion',
+ widget: true
+ });
+})();