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import { observer } from "mobx-react";
import React = require("react");
import { observable, action, runInAction } from "mobx";
import { RouteStore } from "../../../server/RouteStore";
import * as Pdfjs from "pdfjs-dist";
import { Opt } from "../../../new_fields/Doc";
import "./PDFViewer.scss";
interface IPDFViewerProps {
url: string;
}
@observer
export class PDFViewer extends React.Component<IPDFViewerProps> {
@observable _pdf: Opt<Pdfjs.PDFDocumentProxy>;
@action
componentDidMount() {
// const pdfUrl = window.origin + RouteStore.corsProxy + "/https://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf";
const pdfUrl = this.props.url;
let promise = Pdfjs.getDocument(pdfUrl).promise;
promise.then((pdf: Pdfjs.PDFDocumentProxy) => {
runInAction(() => this._pdf = pdf);
});
}
render() {
console.log("PDFVIEWER");
console.log(this._pdf);
return (
<div>
<Viewer pdf={this._pdf} />
</div>
);
}
}
interface IViewerProps {
pdf: Opt<Pdfjs.PDFDocumentProxy>;
}
class Viewer extends React.Component<IViewerProps> {
render() {
console.log("VIEWER");
let numPages = this.props.pdf ? this.props.pdf.numPages : 0;
console.log(numPages);
return (
<div className="viewer">
{Array.from(Array(numPages).keys()).map((i) => (
<Page
pdf={this.props.pdf}
page={i}
numPages={numPages}
key={`${this.props.pdf ? this.props.pdf.fingerprint + `page${i + 1}` : "undefined"}`}
name={`${this.props.pdf ? this.props.pdf.fingerprint + `page${i + 1}` : "undefined"}`}
{...this.props}
/>
))} }
</div>
);
}
}
interface IPageProps {
pdf: Opt<Pdfjs.PDFDocumentProxy>;
name: string;
numPages: number;
page: number;
}
@observer
class Page extends React.Component<IPageProps> {
@observable _state: string = "N/A";
@observable _width: number = 0;
@observable _height: number = 0;
@observable _page: Opt<Pdfjs.PDFPageProxy>;
canvas: React.RefObject<HTMLCanvasElement>;
textLayer: React.RefObject<HTMLDivElement>;
@observable _currPage: number = this.props.page + 1;
constructor(props: IPageProps) {
super(props);
this.canvas = React.createRef();
this.textLayer = React.createRef();
}
componentDidMount() {
console.log(this.props.pdf);
if (this.props.pdf) {
this.update(this.props.pdf);
}
}
componentDidUpdate() {
if (this.props.pdf) {
this.update(this.props.pdf);
}
}
private update = (pdf: Pdfjs.PDFDocumentProxy) => {
if (pdf) {
this.loadPage(pdf);
}
else {
this._state = "loading";
}
}
private loadPage = (pdf: Pdfjs.PDFDocumentProxy) => {
if (this._state === "rendering" || this._page) return;
pdf.getPage(this._currPage).then(
(page: Pdfjs.PDFPageProxy) => {
console.log("PAGE");
console.log(page);
this._state = "rendering";
this.renderPage(page);
}
)
}
@action
private renderPage = (page: Pdfjs.PDFPageProxy) => {
let scale = 1;
let viewport = page.getViewport(scale);
let canvas = this.canvas.current;
if (canvas) {
let context = canvas.getContext("2d");
canvas.width = viewport.width;
this._width = viewport.width;
canvas.height = viewport.height;
this._height = viewport.height;
if (context) {
page.render({ canvasContext: context, viewport: viewport });
page.getTextContent().then((res: Pdfjs.TextContent) => {
//@ts-ignore
let textLayer = Pdfjs.renderTextLayer({
textContent: res,
container: this.textLayer.current,
viewport: viewport
});
// textLayer._render();
this._state = "rendered";
});
this._page = page;
}
}
}
@action
prevPage = (e: React.MouseEvent) => {
if (this._currPage > 2 && this._state !== "rendering") {
this._currPage = Math.max(this._currPage - 1, 1);
this._page = undefined;
this.loadPage(this.props.pdf!);
this._state = "rendering";
}
}
@action
nextPage = (e: React.MouseEvent) => {
if (this._currPage < this.props.numPages - 1 && this._state !== "rendering") {
this._currPage = Math.min(this._currPage + 1, this.props.numPages)
this._page = undefined;
this.loadPage(this.props.pdf!);
this._state = "rendering";
}
}
render() {
return (
<div className={this.props.name} style={{ "width": this._width, "height": this._height }}>
<div className="canvasContainer">
<canvas ref={this.canvas} />
</div>
<div className="textlayer" ref={this.textLayer} style={{ "position": "relative", "top": `-${this._height}px`, "height": `${this._height}px` }} />
{/* <div className="viewer-button-cont" style={{ "width": this._width / 10, "height": this._height / 20, "left": this._width * .9, "top": this._height * .95 }}>
<div className="viewer-previousPage" onClick={this.prevPage}><</div>
<div className="viewer-nextPage" onClick={this.nextPage}>></div>
</div> */}
</div>
);
}
}
|
