Electron workshop - step 3

main.js

const electron = require('electron')
// Module to control application life.
const app = electron.app
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow
const Menu = electron.Menu
const Tray = electron.Tray
const ipc = electron.ipcMain

const path = require('path')
const url = require('url')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({width: 800, height: 600})

  // and load the index.html of the app.
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }))

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

let tray = null
let contextMenu = null

app.on('ready', () => {
  const iconName = process.platform === 'win32'
    ? 'windows-icon.png'
    : 'iconTemplate.png'

  tray = new Tray(`./assets/${iconName}`)

  tray.on('click', () => {
    tray.popUpContextMenu(contextMenu)
  })
})

ipc.on('update-prices', (event, prices) => {
  let menuTemplate = []

  const cryptoCurrencies = Object.keys(prices)
  const currencies = ['EUR', 'USD']

  cryptoCurrencies.forEach(cryptoCurrency => {
    currencies.forEach(currency => {
      menuTemplate.push({
        label: cryptoCurrency + '-' + currency + ': ' + prices[cryptoCurrency][currency]
      })
    })
  })

  contextMenu = Menu.buildFromTemplate(menuTemplate)
})

renderer.js

const ipc = require('electron').ipcRenderer

const app = document.getElementById('app')

const getPrices = () => {
  return fetch(
    'https://min-api.cryptocompare.com/data/pricemulti?fsyms=BTC,ETH,LTC&tsyms=USD,EUR'
  ).then(res => {
    return res.json()
  })
}

const update = () => {
  getPrices().then(res => {
    const html = Object.entries(res)
      .map(currency => {
        return `<div class="currency-row">
          <h2 class="currency-title">${currency[0]}</h2>
          € ${currency[1].EUR}<br />
          $ ${currency[1].USD}
        </div>`
      })
      .join('')

    ipc.send('update-prices', res)

    app.innerHTML = html
  })
}

update()
setInterval(update, 2000)