@nativescript/pdf/index.android.js

A NativeScript plugin to display PDF files on iOS and Android

import { Http } from '@nativescript/core';
import { PDFViewCommon, srcProperty } from './common';
export class PDFView extends PDFViewCommon {
    constructor() {
        super(...arguments);
        this.onLoadHandler = (() => {
            const pdfViewRef = new WeakRef(this);
            return new com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener({
                loadComplete: (numPages) => {
                    PDFViewCommon.notifyOfEvent(PDFViewCommon.loadEvent, pdfViewRef);
                },
            });
        })();
    }
    createNativeView() {
        return new com.github.barteksc.pdfviewer.PDFView(this._context, void 0);
    }
    [srcProperty.setNative](value) {
        this.loadPDF(value);
    }
    loadPDF(src) {
        if (!src || !this.android) {
            return;
        }
        // reset any previous promise since we've called loadPDF again
        this.promise = void 0;
        // detect base64 stream
        const base64prefix = 'data:application/pdf;base64,';
        if (src.indexOf(base64prefix) === 0) {
            const base64data = android.util.Base64.decode(src.substring(base64prefix.length), android.util.Base64.DEFAULT);
            this.createTempFile(base64data);
            return;
        }
        if (src.indexOf('://') === -1) {
            src = 'file://' + src;
        }
        else if (src.indexOf('file://') !== 0) {
            // AndroidPdfViewer cannot load from remote URLs, download to cache
            this.cacheThenLoad(src);
            return;
        }
        const uri = android.net.Uri.parse(src);
        const defaultSpacingDP = 8;
        this.android.fromUri(uri).onLoad(this.onLoadHandler).spacing(defaultSpacingDP).enableAnnotationRendering(this.enableAnnotationRendering).fitEachPage(true).load();
    }
    cacheThenLoad(url) {
        // clear everything in cache
        this.createTempFile().then((tmpFolder) => {
            // download to cache
            const promise = (this.promise = Http.getFile(url, `${tmpFolder.path}/${Date.now()}.pdf`)
                .then((file) => {
                if (this.promise === promise) {
                    // make sure we haven't switched
                    this.loadPDF(file.path);
                }
            })
                .catch((error) => {
                console.error(error);
            }));
        });
    }
}
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