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helpers.js
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helpers.js
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/**
* Copyright 2019 The AMP HTML Authors. 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.
*/
const TAG_NAME = 'amp-base-carousel';
const SLOTTED_CLASS = 'i-amphtml-carousel-slotted';
const SPACER_CLASS = 'i-amphtml-carousel-spacer';
const SCROLLER_SELECTOR = `${TAG_NAME} .i-amphtml-carousel-scroll`;
const PREV_ARROW_SLOT_SELECTOR = '.i-amphtml-carousel-arrow-prev-slot';
const NEXT_ARROW_SLOT_SELECTOR = '.i-amphtml-carousel-arrow-next-slot';
const PREV_ARROW_SELECTOR = `${PREV_ARROW_SLOT_SELECTOR} :first-child`;
const NEXT_ARROW_SELECTOR = `${NEXT_ARROW_SLOT_SELECTOR} :first-child`;
async function waitForImgLoad(controller, el) {
await expect(controller.getElementProperty(el, 'naturalWidth'))
.to.be.greaterThan(0);
}
export async function waitForCarouselImg(controller, n) {
// We cannot use CSS's nth child due to non-slide elements in the scroll
// container. We query all the imgs upfront, since they might not have
// laid out yet.
const el = await controller.findElementXPath(
`//${TAG_NAME}//div[contains(@class, "${SLOTTED_CLASS}")][${n + 1}]` +
'//img');
return await waitForImgLoad(controller, el);
}
export function getSlides(controller) {
return controller.findElements(`${TAG_NAME} .${SLOTTED_CLASS}`);
}
export async function getSlide(controller, n) {
const slides = await getSlides(controller);
return slides[n];
}
export async function getSpacers(controller) {
return controller.findElements(`${TAG_NAME} .${SPACER_CLASS}`);
}
export async function getSpacersForSlide(controller, n) {
const spacers = await getSpacers(controller);
const slideCount = spacers.length / 3;
return [
spacers[n],
spacers[n + slideCount],
spacers[n + 2 * slideCount],
];
}
export async function getScrollingElement(controller) {
return controller.findElement(SCROLLER_SELECTOR);
}
export function getPrevArrowSlot(controller) {
return controller.findElement(PREV_ARROW_SLOT_SELECTOR);
}
export function getNextArrowSlot(controller) {
return controller.findElement(NEXT_ARROW_SLOT_SELECTOR);
}
export function getPrevArrow(controller) {
return controller.findElement(PREV_ARROW_SELECTOR);
}
export function getNextArrow(controller) {
return controller.findElement(NEXT_ARROW_SELECTOR);
}