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@nornagon
Created May 20, 2019 23:13
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Electron Fiddle Gist
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Tracing Test</title>
</head>
<body>
<button id="do_work">do work</button>
<button id="record">start recording</button>
<script>
require('./renderer.js')
</script>
</body>
</html>
// Modules to control application life and create native browser window
const {app, BrowserWindow, ipcMain, contentTracing, shell} = require('electron')
const path = require('path')
// 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
ipcMain.on('do-work', (e) => {
const start = +new Date
while (new Date < start + 1000) {
// do nothing
}
e.reply('work-done')
})
ipcMain.on('start-recording', (e) => {
contentTracing.startRecording({
included_categories: [
'*',
'disabled-by-default-devtools.timeline',
'disabled-by-default-devtools.timeline.frame',
'disabled-by-default-v8.cpu_profiler',
'disabled-by-default-v8.cpu_profiler.hires',
'disabled-by-default-devtools.timeline.stack',
],
excluded_categories: [],
})
})
ipcMain.on('stop-recording', async (e) => {
const tracePath = await contentTracing.stopRecording(path.join(__dirname, 'trace.json'))
shell.openItem(__dirname)
})
function createWindow () {
// Create the browser window.
mainWindow = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
nodeIntegration: true
}
})
// and load the index.html of the app.
mainWindow.loadFile('index.html')
// 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.
// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// All of the Node.js APIs are available in this process.
const {webFrame, ipcRenderer} = require('electron')
do_work.addEventListener('click', e => {
e.target.disabled = true
ipcRenderer.send('do-work')
e.target.textContent = 'doing work in main process...'
})
ipcRenderer.on('work-done', () => {
do_work.disabled = false
do_work.textContent = 'do work'
})
let recording = false
record.addEventListener('click', e => {
if (recording) {
ipcRenderer.send('stop-recording')
e.target.textContent = 'start recording'
recording = false
} else {
ipcRenderer.send('start-recording')
e.target.textContent = 'stop recording'
recording = true
}
})
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