114 lines
2.6 KiB
JavaScript
114 lines
2.6 KiB
JavaScript
import sqljs from 'sql.js';
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import { template as _template } from 'underscore';
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const PREVIEW_TEMPLATE = _template(`
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<div class="card">
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<div class="card-header"><%- name %></div>
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<div class="card-body">
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<img class="img-thumbnail" src="data:image/png;base64,<%- image %>"/>
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</div>
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</div>
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`);
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class BalsamiqViewer {
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constructor(viewer) {
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this.viewer = viewer;
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}
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loadFile(endpoint) {
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return new Promise((resolve, reject) => {
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const xhr = new XMLHttpRequest();
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xhr.open('GET', endpoint, true);
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xhr.responseType = 'arraybuffer';
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xhr.onload = loadEvent => this.fileLoaded(loadEvent, resolve, reject);
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xhr.onerror = reject;
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xhr.send();
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});
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}
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fileLoaded(loadEvent, resolve, reject) {
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if (loadEvent.target.status !== 200) return reject();
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this.renderFile(loadEvent);
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return resolve();
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}
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renderFile(loadEvent) {
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const container = document.createElement('ul');
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this.initDatabase(loadEvent.target.response);
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const previews = this.getPreviews();
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previews.forEach(preview => {
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const renderedPreview = this.renderPreview(preview);
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container.appendChild(renderedPreview);
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});
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container.classList.add('list-inline');
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container.classList.add('previews');
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this.viewer.appendChild(container);
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}
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initDatabase(data) {
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const previewBinary = new Uint8Array(data);
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this.database = new sqljs.Database(previewBinary);
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}
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getPreviews() {
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const thumbnails = this.database.exec('SELECT * FROM thumbnails');
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return thumbnails[0].values.map(BalsamiqViewer.parsePreview);
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}
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getResource(resourceID) {
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const resources = this.database.exec(`SELECT * FROM resources WHERE id = '${resourceID}'`);
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return resources[0];
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}
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renderPreview(preview) {
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const previewElement = document.createElement('li');
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previewElement.classList.add('preview');
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previewElement.innerHTML = this.renderTemplate(preview);
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return previewElement;
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}
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renderTemplate(preview) {
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const resource = this.getResource(preview.resourceID);
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const name = BalsamiqViewer.parseTitle(resource);
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const { image } = preview;
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const template = PREVIEW_TEMPLATE({
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name,
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image,
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});
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return template;
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}
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static parsePreview(preview) {
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return JSON.parse(preview[1]);
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}
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/*
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* resource = {
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* columns: ['ID', 'BRANCHID', 'ATTRIBUTES', 'DATA'],
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* values: [['id', 'branchId', 'attributes', 'data']],
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* }
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*
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* 'attributes' being a JSON string containing the `name` property.
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*/
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static parseTitle(resource) {
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return JSON.parse(resource.values[0][2]).name;
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}
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}
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export default BalsamiqViewer;
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