Project import generated by Copybara.
GitOrigin-RevId: 63746295f1a5ab5a619056791995793d65529e62
diff --git a/node_modules/mdl-ext/src/lightbox/lightbox.js b/node_modules/mdl-ext/src/lightbox/lightbox.js
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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
+ */
+
+
+/**
+ * Responsive Lightbox
+ */
+
+import fullThrottle from '../utils/full-throttle';
+import {
+ VK_ESC,
+ VK_SPACE,
+ VK_END,
+ VK_HOME,
+ VK_ARROW_LEFT,
+ VK_ARROW_UP,
+ VK_ARROW_RIGHT,
+ VK_ARROW_DOWN,
+ IS_UPGRADED
+} from '../utils/constants';
+
+(function() {
+ 'use strict';
+
+ const LIGHTBOX = 'mdlext-lightbox';
+ const LIGHTBOX_SLIDER = 'mdlext-lightbox__slider';
+ const LIGHTBOX_SLIDER_SLIDE = 'mdlext-lightbox__slider__slide';
+ const STICKY_FOOTER = 'mdlext-lightbox--sticky-footer';
+ const BUTTON = 'mdl-button';
+
+ /**
+ * https://github.com/google/material-design-lite/issues/4205
+ * @constructor
+ * @param {Element} element The element that will be upgraded.
+ */
+ const MaterialExtLightbox = function MaterialExtLightbox(element) {
+ // Stores the element.
+ this.element_ = element;
+
+ // Initialize instance.
+ this.init();
+ };
+ window['MaterialExtLightbox'] = MaterialExtLightbox;
+
+
+ /**
+ * Handle keypress
+ * @param event
+ * @private
+ */
+ MaterialExtLightbox.prototype.keyDownHandler_ = function(event) {
+
+ if (event) {
+ if ( event.keyCode === VK_ESC || event.keyCode === VK_SPACE
+ || event.keyCode === VK_END || event.keyCode === VK_HOME
+ || event.keyCode === VK_ARROW_UP || event.keyCode === VK_ARROW_LEFT
+ || event.keyCode === VK_ARROW_DOWN || event.keyCode === VK_ARROW_RIGHT) {
+
+ if(event.keyCode !== VK_ESC) {
+ event.preventDefault();
+ event.stopPropagation();
+ }
+
+ let action = 'first';
+ if (event.keyCode === VK_END) {
+ action = 'last';
+ }
+ else if (event.keyCode === VK_ARROW_UP || event.keyCode === VK_ARROW_LEFT) {
+ action = 'prev';
+ }
+ else if (event.keyCode === VK_ARROW_DOWN || event.keyCode === VK_ARROW_RIGHT) {
+ action = 'next';
+ }
+ else if (event.keyCode === VK_SPACE) {
+ action = 'select';
+ }
+ else if (event.keyCode === VK_ESC) {
+ action = 'cancel';
+ }
+
+ dispatchAction_(action, this);
+ }
+ }
+ };
+
+ /**
+ * Handle button clicks
+ * @param event
+ * @private
+ */
+ MaterialExtLightbox.prototype.buttonClickHandler_ = function(event) {
+
+ if (event) {
+ event.preventDefault();
+ event.stopPropagation();
+
+ dispatchAction_(this.getAttribute('data-action') || '', this);
+
+ const n = this.closest(`.${LIGHTBOX}`);
+ if(n) {
+ n.focus();
+ }
+ }
+ };
+
+ /**
+ * Dispatches an action custom event
+ * @param action
+ * @param source
+ * @param target
+ * @private
+ */
+ const dispatchAction_ = (action, source, target = source) => {
+
+ target.dispatchEvent(new CustomEvent('action', {
+ bubbles: true,
+ cancelable: true,
+ detail: {
+ action: action || '',
+ source: source
+ }
+ }));
+ };
+
+ /**
+ * Reposition dialog if component parent element is "DIALOG"
+ * @param lightboxElement
+ * @private
+ */
+ const repositionDialog_ = lightboxElement => {
+ const footerHeight = (footer, isSticky) => isSticky && footer ? footer.offsetHeight : 0;
+
+ const reposition = (dialog, fh) => {
+ if (window.getComputedStyle(dialog).position === 'absolute') {
+ const scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
+ const topValue = scrollTop + (window.innerHeight - dialog.offsetHeight - fh) / 2;
+ dialog.style.top = `${Math.max(scrollTop, topValue)}px`;
+ }
+ };
+
+ const p = lightboxElement.parentNode;
+ const dialog = p && p.nodeName === 'DIALOG' ? p : null;
+
+ if(dialog && dialog.hasAttribute('open')) {
+ lightboxElement.style.width = 'auto';
+ lightboxElement.style.maxWidth = '100%';
+ const img = lightboxElement.querySelector('img');
+ if(img) {
+ lightboxElement.style.maxWidth = img.naturalWidth !== undefined ? `${img.naturalWidth}px` : `${img.width}px` || '100%';
+ }
+
+ const fh = footerHeight(lightboxElement.querySelector('footer'), lightboxElement.classList.contains(STICKY_FOOTER));
+ const vh = Math.max(document.documentElement.clientHeight, window.innerHeight || 0) - fh;
+ if (dialog.offsetHeight > vh) {
+ let n = 0;
+ while(dialog.offsetHeight > vh && ++n < 4) {
+ lightboxElement.style.width = `${lightboxElement.offsetWidth * vh / lightboxElement.offsetHeight}px`;
+ }
+ }
+ reposition(dialog, fh);
+ }
+ };
+
+ /**
+ * Handle image load
+ * @param event
+ * @private
+ */
+
+ MaterialExtLightbox.prototype.imgLoadHandler_ = function( /*event*/ ) {
+ repositionDialog_(this);
+ };
+
+
+ /**
+ * Handle image drag
+ * @param event
+ * @private
+ */
+ MaterialExtLightbox.prototype.imgDragHandler_ = function(event ) {
+
+ const setStyles = ( element, properties ) => {
+ //noinspection JSAnnotator
+ for(const [key, value] of Object.entries(properties)) {
+ element.style[key] = value;
+ }
+ // ... or:
+ //for (const key in properties) {
+ // element.style[key] = properties[key];
+ //}
+ };
+
+ event.preventDefault();
+ //event.stopPropagation();
+
+ const x = event.clientX || (event.touches !== undefined ? event.touches[0].clientX : 0);
+
+ const img = this;
+ img.style.opacity = '0.2';
+
+ const slider = document.createElement('div');
+ slider.classList.add(LIGHTBOX_SLIDER);
+ setStyles(slider, {'width': `${img.offsetWidth}px`, 'height': `${img.offsetHeight}px`} );
+
+ let slide = document.createElement('div');
+ slide.classList.add(LIGHTBOX_SLIDER_SLIDE);
+ slide.textContent = '>';
+ setStyles(slide, {
+ 'width' : `${img.offsetWidth}px`,
+ 'height' : `${img.offsetHeight}px`,
+ 'line-height' : `${img.offsetHeight}px`,
+ 'font-size' : `${img.offsetHeight/4}px`,
+ 'text-align' : 'right',
+ 'background-image': `url("${img.getAttribute('data-img-url-prev') || ''}")`
+ });
+ slider.appendChild(slide);
+
+ slide = document.createElement('div');
+ slide.classList.add(LIGHTBOX_SLIDER_SLIDE);
+ setStyles(slide, {
+ 'width' : `${img.offsetWidth}px`,
+ 'height' : `${img.offsetHeight}px`,
+ 'background-image': `url("${img.src}")`
+ });
+ slider.appendChild(slide);
+
+ slide = document.createElement('div');
+ slide.classList.add(LIGHTBOX_SLIDER_SLIDE);
+ slide.textContent = '<';
+ setStyles(slide, {
+ 'width' : `${img.offsetWidth}px`,
+ 'height' : `${img.offsetHeight}px`,
+ 'line-height' : `${img.offsetHeight}px`,
+ 'font-size' : `${img.offsetHeight/4}px`,
+ 'text-align' : 'left',
+ 'background-image': `url("${img.getAttribute('data-img-url-next') || ''}")`
+ });
+ slider.appendChild(slide);
+
+ img.parentNode.appendChild(slider);
+
+
+ // drag handler
+ const drag = e => {
+ e.preventDefault();
+ const dx = (e.clientX || (e.touches !== undefined ? e.touches[0].clientX : 0)) - x; // TODO: maybe rewrite to improve performance
+
+ if(slider.offsetWidth - Math.abs(dx) > 19) {
+ slider.style.left = `${dx}px`;
+ }
+ };
+
+ // end drag handler
+ const endDrag = e => {
+ e.preventDefault();
+ //e.stopPropagation();
+
+ window.removeEventListener('mousemove', drag);
+ window.removeEventListener('touchmove', drag);
+ window.removeEventListener('mouseup', endDrag);
+ window.removeEventListener('touchend', endDrag);
+
+ const dx = slider.offsetLeft;
+ img.parentNode.removeChild(slider);
+ img.style.opacity = '1.0';
+
+ if(Math.abs(dx) > 19) {
+ dispatchAction_( (dx > 0 ? 'prev' : 'next') , img);
+ }
+ };
+
+ window.addEventListener('mousemove', drag);
+ window.addEventListener('touchmove', drag);
+ window.addEventListener('mouseup', endDrag);
+ window.addEventListener('touchend',endDrag);
+ };
+
+
+ /**
+ * Initialize component
+ */
+ MaterialExtLightbox.prototype.init = function() {
+
+ if (this.element_) {
+ // Do the init required for this component to work
+ this.element_.addEventListener('keydown', this.keyDownHandler_.bind(this.element_), true);
+
+ if(!Number.isInteger(this.element_.getAttribute('tabindex'))) {
+ this.element_.setAttribute('tabindex', 1);
+ }
+
+ [...this.element_.querySelectorAll(`.${BUTTON}`)].forEach( button =>
+ button.addEventListener('click', this.buttonClickHandler_.bind(button), false)
+ );
+
+ const figcaption = this.element_.querySelector('figcaption');
+ if(figcaption) {
+ figcaption.addEventListener('click', this.buttonClickHandler_.bind(figcaption), false);
+ }
+
+ const footer = this.element_.querySelector('footer');
+ if(footer) {
+ footer.addEventListener('click', this.buttonClickHandler_.bind(footer), false);
+ }
+
+ const img = this.element_.querySelector('img');
+ if(img) {
+ img.addEventListener('load', this.imgLoadHandler_.bind(this.element_), false);
+ img.addEventListener('click', e => e.preventDefault(), true);
+ img.addEventListener('mousedown', this.imgDragHandler_.bind(img), true);
+ img.addEventListener('touchstart', this.imgDragHandler_.bind(img), true);
+ }
+ window.addEventListener('resize', fullThrottle( () => repositionDialog_(this.element_) ));
+ window.addEventListener('orientationchange', () => repositionDialog_(this.element_));
+
+ // Set upgraded flag
+ this.element_.classList.add(IS_UPGRADED);
+ }
+ };
+
+ /*
+ * Downgrade component
+ * E.g remove listeners and clean up resources
+ *
+ * Nothing to downgrade
+ *
+ MaterialExtLightbox.prototype.mdlDowngrade_ = function() {
+ };
+ */
+
+ /**
+ * The component registers itself. It can assume componentHandler is available in the global scope.
+ */
+ /* jshint undef:false */
+ componentHandler.register({
+ constructor: MaterialExtLightbox,
+ classAsString: 'MaterialExtLightbox',
+ cssClass: 'mdlext-js-lightbox'
+ });
+
+})();
+