diff options
Diffstat (limited to 'app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js')
-rw-r--r-- | app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js new file mode 100644 index 00000000000..c17877a276d --- /dev/null +++ b/app/assets/javascripts/blob/balsamiq/balsamiq_viewer.js @@ -0,0 +1,114 @@ +import sqljs from 'sql.js'; +import { template as _template } from 'underscore'; + +const PREVIEW_TEMPLATE = _template(` + <div class="panel panel-default"> + <div class="panel-heading"><%- name %></div> + <div class="panel-body"> + <img class="img-thumbnail" src="data:image/png;base64,<%- image %>"/> + </div> + </div> +`); + +class BalsamiqViewer { + constructor(viewer) { + this.viewer = viewer; + } + + loadFile(endpoint) { + return new Promise((resolve, reject) => { + const xhr = new XMLHttpRequest(); + + xhr.open('GET', endpoint, true); + xhr.responseType = 'arraybuffer'; + xhr.onload = loadEvent => this.fileLoaded(loadEvent, resolve, reject); + xhr.onerror = reject; + + xhr.send(); + }); + } + + fileLoaded(loadEvent, resolve, reject) { + if (loadEvent.target.status !== 200) return reject(); + + this.renderFile(loadEvent); + + return resolve(); + } + + renderFile(loadEvent) { + const container = document.createElement('ul'); + + this.initDatabase(loadEvent.target.response); + + const previews = this.getPreviews(); + previews.forEach((preview) => { + const renderedPreview = this.renderPreview(preview); + + container.appendChild(renderedPreview); + }); + + container.classList.add('list-inline'); + container.classList.add('previews'); + + this.viewer.appendChild(container); + } + + initDatabase(data) { + const previewBinary = new Uint8Array(data); + + this.database = new sqljs.Database(previewBinary); + } + + getPreviews() { + const thumbnails = this.database.exec('SELECT * FROM thumbnails'); + + return thumbnails[0].values.map(BalsamiqViewer.parsePreview); + } + + getResource(resourceID) { + const resources = this.database.exec(`SELECT * FROM resources WHERE id = '${resourceID}'`); + + return resources[0]; + } + + renderPreview(preview) { + const previewElement = document.createElement('li'); + + previewElement.classList.add('preview'); + previewElement.innerHTML = this.renderTemplate(preview); + + return previewElement; + } + + renderTemplate(preview) { + const resource = this.getResource(preview.resourceID); + const name = BalsamiqViewer.parseTitle(resource); + const image = preview.image; + + const template = PREVIEW_TEMPLATE({ + name, + image, + }); + + return template; + } + + static parsePreview(preview) { + return JSON.parse(preview[1]); + } + + /* + * resource = { + * columns: ['ID', 'BRANCHID', 'ATTRIBUTES', 'DATA'], + * values: [['id', 'branchId', 'attributes', 'data']], + * } + * + * 'attributes' being a JSON string containing the `name` property. + */ + static parseTitle(resource) { + return JSON.parse(resource.values[0][2]).name; + } +} + +export default BalsamiqViewer; |