ENH: model info display UI

Change-Id: I066c0e7f8ce87ec00b1141a1b44430444a819b42
(cherry picked from commit 05907a1a42da82737090d55046974d401f8af057)

resources/web/include/swiper/modules/a11y/a11y.js

@@ -0,0 +1,283 @@
+import classesToSelector from '../../shared/classes-to-selector.js';
+import $ from '../../shared/dom.js';
+export default function A11y({
+  swiper,
+  extendParams,
+  on
+}) {
+  extendParams({
+    a11y: {
+      enabled: true,
+      notificationClass: 'swiper-notification',
+      prevSlideMessage: 'Previous slide',
+      nextSlideMessage: 'Next slide',
+      firstSlideMessage: 'This is the first slide',
+      lastSlideMessage: 'This is the last slide',
+      paginationBulletMessage: 'Go to slide {{index}}',
+      slideLabelMessage: '{{index}} / {{slidesLength}}',
+      containerMessage: null,
+      containerRoleDescriptionMessage: null,
+      itemRoleDescriptionMessage: null,
+      slideRole: 'group'
+    }
+  });
+  let liveRegion = null;
+
+  function notify(message) {
+    const notification = liveRegion;
+    if (notification.length === 0) return;
+    notification.html('');
+    notification.html(message);
+  }
+
+  function getRandomNumber(size = 16) {
+    const randomChar = () => Math.round(16 * Math.random()).toString(16);
+
+    return 'x'.repeat(size).replace(/x/g, randomChar);
+  }
+
+  function makeElFocusable($el) {
+    $el.attr('tabIndex', '0');
+  }
+
+  function makeElNotFocusable($el) {
+    $el.attr('tabIndex', '-1');
+  }
+
+  function addElRole($el, role) {
+    $el.attr('role', role);
+  }
+
+  function addElRoleDescription($el, description) {
+    $el.attr('aria-roledescription', description);
+  }
+
+  function addElControls($el, controls) {
+    $el.attr('aria-controls', controls);
+  }
+
+  function addElLabel($el, label) {
+    $el.attr('aria-label', label);
+  }
+
+  function addElId($el, id) {
+    $el.attr('id', id);
+  }
+
+  function addElLive($el, live) {
+    $el.attr('aria-live', live);
+  }
+
+  function disableEl($el) {
+    $el.attr('aria-disabled', true);
+  }
+
+  function enableEl($el) {
+    $el.attr('aria-disabled', false);
+  }
+
+  function onEnterOrSpaceKey(e) {
+    if (e.keyCode !== 13 && e.keyCode !== 32) return;
+    const params = swiper.params.a11y;
+    const $targetEl = $(e.target);
+
+    if (swiper.navigation && swiper.navigation.$nextEl && $targetEl.is(swiper.navigation.$nextEl)) {
+      if (!(swiper.isEnd && !swiper.params.loop)) {
+        swiper.slideNext();
+      }
+
+      if (swiper.isEnd) {
+        notify(params.lastSlideMessage);
+      } else {
+        notify(params.nextSlideMessage);
+      }
+    }
+
+    if (swiper.navigation && swiper.navigation.$prevEl && $targetEl.is(swiper.navigation.$prevEl)) {
+      if (!(swiper.isBeginning && !swiper.params.loop)) {
+        swiper.slidePrev();
+      }
+
+      if (swiper.isBeginning) {
+        notify(params.firstSlideMessage);
+      } else {
+        notify(params.prevSlideMessage);
+      }
+    }
+
+    if (swiper.pagination && $targetEl.is(classesToSelector(swiper.params.pagination.bulletClass))) {
+      $targetEl[0].click();
+    }
+  }
+
+  function updateNavigation() {
+    if (swiper.params.loop || !swiper.navigation) return;
+    const {
+      $nextEl,
+      $prevEl
+    } = swiper.navigation;
+
+    if ($prevEl && $prevEl.length > 0) {
+      if (swiper.isBeginning) {
+        disableEl($prevEl);
+        makeElNotFocusable($prevEl);
+      } else {
+        enableEl($prevEl);
+        makeElFocusable($prevEl);
+      }
+    }
+
+    if ($nextEl && $nextEl.length > 0) {
+      if (swiper.isEnd) {
+        disableEl($nextEl);
+        makeElNotFocusable($nextEl);
+      } else {
+        enableEl($nextEl);
+        makeElFocusable($nextEl);
+      }
+    }
+  }
+
+  function hasPagination() {
+    return swiper.pagination && swiper.params.pagination.clickable && swiper.pagination.bullets && swiper.pagination.bullets.length;
+  }
+
+  function updatePagination() {
+    const params = swiper.params.a11y;
+
+    if (hasPagination()) {
+      swiper.pagination.bullets.each(bulletEl => {
+        const $bulletEl = $(bulletEl);
+        makeElFocusable($bulletEl);
+
+        if (!swiper.params.pagination.renderBullet) {
+          addElRole($bulletEl, 'button');
+          addElLabel($bulletEl, params.paginationBulletMessage.replace(/\{\{index\}\}/, $bulletEl.index() + 1));
+        }
+      });
+    }
+  }
+
+  const initNavEl = ($el, wrapperId, message) => {
+    makeElFocusable($el);
+
+    if ($el[0].tagName !== 'BUTTON') {
+      addElRole($el, 'button');
+      $el.on('keydown', onEnterOrSpaceKey);
+    }
+
+    addElLabel($el, message);
+    addElControls($el, wrapperId);
+  };
+
+  function init() {
+    const params = swiper.params.a11y;
+    swiper.$el.append(liveRegion); // Container
+
+    const $containerEl = swiper.$el;
+
+    if (params.containerRoleDescriptionMessage) {
+      addElRoleDescription($containerEl, params.containerRoleDescriptionMessage);
+    }
+
+    if (params.containerMessage) {
+      addElLabel($containerEl, params.containerMessage);
+    } // Wrapper
+
+
+    const $wrapperEl = swiper.$wrapperEl;
+    const wrapperId = $wrapperEl.attr('id') || `swiper-wrapper-${getRandomNumber(16)}`;
+    const live = swiper.params.autoplay && swiper.params.autoplay.enabled ? 'off' : 'polite';
+    addElId($wrapperEl, wrapperId);
+    addElLive($wrapperEl, live); // Slide
+
+    if (params.itemRoleDescriptionMessage) {
+      addElRoleDescription($(swiper.slides), params.itemRoleDescriptionMessage);
+    }
+
+    addElRole($(swiper.slides), params.slideRole);
+    const slidesLength = swiper.params.loop ? swiper.slides.filter(el => !el.classList.contains(swiper.params.slideDuplicateClass)).length : swiper.slides.length;
+    swiper.slides.each((slideEl, index) => {
+      const $slideEl = $(slideEl);
+      const slideIndex = swiper.params.loop ? parseInt($slideEl.attr('data-swiper-slide-index'), 10) : index;
+      const ariaLabelMessage = params.slideLabelMessage.replace(/\{\{index\}\}/, slideIndex + 1).replace(/\{\{slidesLength\}\}/, slidesLength);
+      addElLabel($slideEl, ariaLabelMessage);
+    }); // Navigation
+
+    let $nextEl;
+    let $prevEl;
+
+    if (swiper.navigation && swiper.navigation.$nextEl) {
+      $nextEl = swiper.navigation.$nextEl;
+    }
+
+    if (swiper.navigation && swiper.navigation.$prevEl) {
+      $prevEl = swiper.navigation.$prevEl;
+    }
+
+    if ($nextEl && $nextEl.length) {
+      initNavEl($nextEl, wrapperId, params.nextSlideMessage);
+    }
+
+    if ($prevEl && $prevEl.length) {
+      initNavEl($prevEl, wrapperId, params.prevSlideMessage);
+    } // Pagination
+
+
+    if (hasPagination()) {
+      swiper.pagination.$el.on('keydown', classesToSelector(swiper.params.pagination.bulletClass), onEnterOrSpaceKey);
+    }
+  }
+
+  function destroy() {
+    if (liveRegion && liveRegion.length > 0) liveRegion.remove();
+    let $nextEl;
+    let $prevEl;
+
+    if (swiper.navigation && swiper.navigation.$nextEl) {
+      $nextEl = swiper.navigation.$nextEl;
+    }
+
+    if (swiper.navigation && swiper.navigation.$prevEl) {
+      $prevEl = swiper.navigation.$prevEl;
+    }
+
+    if ($nextEl) {
+      $nextEl.off('keydown', onEnterOrSpaceKey);
+    }
+
+    if ($prevEl) {
+      $prevEl.off('keydown', onEnterOrSpaceKey);
+    } // Pagination
+
+
+    if (hasPagination()) {
+      swiper.pagination.$el.off('keydown', classesToSelector(swiper.params.pagination.bulletClass), onEnterOrSpaceKey);
+    }
+  }
+
+  on('beforeInit', () => {
+    liveRegion = $(`<span class="${swiper.params.a11y.notificationClass}" aria-live="assertive" aria-atomic="true"></span>`);
+  });
+  on('afterInit', () => {
+    if (!swiper.params.a11y.enabled) return;
+    init();
+    updateNavigation();
+  });
+  on('toEdge', () => {
+    if (!swiper.params.a11y.enabled) return;
+    updateNavigation();
+  });
+  on('fromEdge', () => {
+    if (!swiper.params.a11y.enabled) return;
+    updateNavigation();
+  });
+  on('paginationUpdate', () => {
+    if (!swiper.params.a11y.enabled) return;
+    updatePagination();
+  });
+  on('destroy', () => {
+    if (!swiper.params.a11y.enabled) return;
+    destroy();
+  });
+}