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Add missing pdf-player.ts file
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Hadi Nategh
parent
c8fd2fac37
commit
cc81b2d173
404
api/js/etemplate/CustomHtmlElements/pdf-player.ts
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404
api/js/etemplate/CustomHtmlElements/pdf-player.ts
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/**
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* EGroupware Custom Html Elements - pdf player Web Components
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*
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package etemplate
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* @subpackage api
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* @link https://www.egroupware.org
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* @author Hadi Nategh <hn[at]egroupware.org>
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* @copyright EGroupware GmbH
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*/
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/*egw:uses
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/node_modules/@bundled-es-modules/pdfjs-dist/build/pdf.js;
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/node_modules/@bundled-es-modules/pdfjs-dist/build/pdf.worker.js;
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*/
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import pdfjs from "@bundled-es-modules/pdfjs-dist/build/pdf";
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/*
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This web component allows to display and play pdf file like a video player widget/element. Its attributes and
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methodes are mostley identical as video html. No controls attribute supported yet.
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*/
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pdfjs.GlobalWorkerOptions.workerSrc = 'node_modules/@bundled-es-modules/pdfjs-dist/build/pdf.worker.js';
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/**
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*
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*/
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type PdfViewArray = {
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pdf: any,
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zoom: number,
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currentPage: number
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};
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// Create a class for the element
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class pdf_player extends HTMLElement {
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/**
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* shadow dom container
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* @private
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*/
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private readonly _shadow = null;
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/**
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* wrapper container holds canvas
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* @private
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*/
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private readonly _wrapper : HTMLDivElement;
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/**
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* Canvas element to render pdf
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* @private
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*/
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private _canvas : HTMLCanvasElement;
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/**
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* Styling contianer
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* @private
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*/
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private readonly _style : HTMLStyleElement;
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/**
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* keeps duration time internally
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* @private
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*/
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private _duration : number = 0;
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/**
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* keeps currentTime internally
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* @private
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*/
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private _currentTime : number = 0;
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/**
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* Keeps playing state internally
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* @private
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*/
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private __playing: boolean = false;
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/**
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* keeps playing interval id
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* @private
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*/
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private __playingInterval : number = 0;
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/**
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* keeps play back rate
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* @private
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*/
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private _playBackRate : number = 1000;
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/**
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* keeps ended state of playing pdf
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* @private
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*/
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private _ended : boolean = false;
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/**
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* keep paused state
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* @private
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*/
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private _paused : boolean = false;
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/**
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* keeps pdf doc states
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* @private
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*/
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private __pdfViewState : PdfViewArray = {
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pdf: null,
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currentPage: 1,
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zoom: 1
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};
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constructor() {
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super();
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// Create a shadow root
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this._shadow = this.attachShadow({mode: 'open'});
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// Create wrapper
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this._wrapper = document.createElement('div');
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this._wrapper.setAttribute('class','wrapper');
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// Create some CSS to apply to the shadow dom
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this._style = document.createElement('style');
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this._style.textContent = '.wrapper {' +
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'width: 100%;' +
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'height: auto;' +
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'display: block;' +
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'}'+
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'.wrapper canvas {' +
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'width: 100%;'+
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'height: auto;'+
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'}';
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// attach to the shadow dom
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this._shadow.appendChild(this._style);
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this._shadow.appendChild(this._wrapper);
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}
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/**
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* set observable attributes
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* @return {string[]}
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*/
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static get observedAttributes() {
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return ['src', 'type'];
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}
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/**
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* Gets called on observable attributes changes
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* @param name attribute name
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* @param _
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* @param newVal new value
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*/
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attributeChangedCallback(name, _, newVal) {
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switch(name)
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{
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case 'src':
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this.__buildPDFView(newVal);
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break;
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case 'type':
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// do nothing
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break;
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}
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}
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/**
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* init/update pdf tag
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* @param _value
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* @private
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*/
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private __buildPDFView(_value)
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{
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this._canvas = document.createElement('canvas');
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this._wrapper.appendChild(this._canvas);
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let longTask = pdfjs.getDocument(_value);
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longTask.promise.then((pdf) => {
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this.__pdfViewState.pdf = pdf;
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this._duration = this.__pdfViewState.pdf._pdfInfo.numPages;
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// initiate the pdf file viewer for the first time after loading
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this.__render(1).then(_ =>{
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this.__pushEvent('loadedmetadata');
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});
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});
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}
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/**
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* Render given page from pdf into the canvas container
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*
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* @param _page
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* @private
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*/
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private __render(_page)
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{
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if (!this.__pdfViewState.pdf) return;
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let p = _page || this.__pdfViewState.currentPage;
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let self = this;
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return this.__pdfViewState.pdf.getPage(p).then((page) => {
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let canvasContext = self._canvas.getContext('2d');
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let viewport = page.getViewport({scale:self.__pdfViewState.zoom});
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self._canvas.width = viewport.width;
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self._canvas.height = viewport.height;
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page.render({
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canvasContext: canvasContext,
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viewport: viewport
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});
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});
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}
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/**
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* Creates event and dispatches it
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* @param _name
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*/
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private __pushEvent(_name: string)
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{
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let event = document.createEvent("Event");
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event.initEvent(_name, true, true);
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this.dispatchEvent(event);
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}
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/**************************** PUBLIC ATTRIBUTES & METHODES *************************************************/
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/****************************** ATTRIBUTES **************************************/
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/**
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* set src
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* @param _value
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*/
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set src(_value)
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{
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this._wrapper.children.forEach(_ch=>{
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_ch.remove();
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});
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this.__buildPDFView(_value);
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}
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/**
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* get src
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* @return string returns comma separated sources
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*/
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get src ()
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{
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return this.src;
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}
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/**
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* currentTime
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* @param _time
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*/
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set currentTime(_time : number)
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{
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let time = Math.floor(_time < 1 ? 1 : _time);
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if (time>this._duration)
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{
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// set ended state to true as it's the last page of pdf
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this._ended = true;
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// don't go further because it's litterally the last page
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return;
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}
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// set ended state to false as it's not the end of the pdf
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this._ended = false;
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this._currentTime = time;
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this.__pdfViewState.currentPage = time;
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this.__render(time);
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}
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/**
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* get currentTime
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* @return {number}
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*/
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get currentTime()
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{
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return this._currentTime;
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}
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/**
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* get duration time
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*/
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get duration()
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{
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return this._duration;
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}
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/**
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* get paused attribute
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*/
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get paused()
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{
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return this._paused;
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}
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/**
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* set muted attribute
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* @param _value
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*/
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set muted(_value: boolean)
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{
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return;
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}
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/**
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* get muted attribute
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*/
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get muted()
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{
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return true;
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}
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set ended (_value : boolean)
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{
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this._ended = _value;
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}
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/**
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* get ended attribute
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*/
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get ended()
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{
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return this._ended;
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}
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/**
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* set playbackRate
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* @param _value
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*/
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set playbackRate(_value: number)
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{
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this._playBackRate = _value*1000;
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}
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/**
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* get playbackRate
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*/
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get playbackRate()
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{
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return this._playBackRate;
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}
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/**
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* set volume
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*/
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set volume(_value: number)
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{
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return;
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}
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/**
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* get volume
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*/
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get volume()
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{
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return 0;
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}
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/************************************************* METHODES ******************************************/
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/**
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* Play
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*/
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play()
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{
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this.__playing = true;
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let self = this;
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return new Promise(function(_resolve, _reject){
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self.__playingInterval = window.setInterval(_=>{
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if (self.currentTime >= self._duration)
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{
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self.ended = true;
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self.pause();
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}
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self.currentTime +=1;
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self.__pushEvent('timeupdate');
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}, self._playBackRate);
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_resolve();
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});
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}
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/**
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* pause
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*/
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pause()
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{
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this.__playing = false;
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this._paused = true;
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window.clearInterval(this.__playingInterval);
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}
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/**
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* seek previous page
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*/
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prevPage()
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{
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this.currentTime -=1;
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}
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/**
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* seek next page
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*/
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nextPage()
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{
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this.currentTime +=1;
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}
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}
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// Define pdf-player element
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customElements.define('pdf-player', pdf_player);
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