rudifa/Electron IPC Pattern #1

## Electron IPC Pattern #1
// 1. the renderer attaches a listener to the button defined in the html file
//  . on user click, the listener calls the function setTitle passing on the value from the input element

// 2. the preload defines the function that will be called by setTitle and pass on the title sending the event set-title

// 3. the main attaches a listener for the event set-title
//    that will get the title an put it into the browser window title

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
    <title>Hello World!</title>
  </head>
  <body>
    Title: <input id="title"/>
    <button id="btn" type="button">Set</button>
    <script src="./renderer.js"></script>
  </body>
</html>

## main.js
const {app, BrowserWindow, ipcMain} = require('electron')
const path = require('path')

function createWindow () {
  const mainWindow = new BrowserWindow({
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  // 3. the main attaches a listener for the event set-title
  //    that will get the title an put it into the browser window title
  ipcMain.on('set-title', (event, title) => {
    const webContents = event.sender
    const win = BrowserWindow.fromWebContents(webContents)
    win.setTitle(title)
  })

  mainWindow.loadFile('index.html')
}

app.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

## package.json
{
  "name": "five-chocolate-verify-9v1cn",
  "productName": "five-chocolate-verify-9v1cn",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "rudifarkas",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "21.2.0"
  }
}

## preload.js
// 2. the preload defines the function that will be called by setTitle and pass on the title sending the event set-title

const { contextBridge, ipcRenderer } = require('electron')

contextBridge.exposeInMainWorld('electronAPI', {
    setTitle: (title) => ipcRenderer.send('set-title', title)
})

## renderer.js
// 1. the renderer attaches a listener to the button defined in the html file
//  . on user click, the listener calls the function setTitle passing on the value from the input element

const setButton = document.getElementById('btn')
const titleInput = document.getElementById('title')
setButton.addEventListener('click', () => {
    const title = titleInput.value
    window.electronAPI.setTitle(title)
});

## styles.css
/* styles.css */

/* Add styles here to customize the appearance of your app */
	// 1. the renderer attaches a listener to the button defined in the html file
	// . on user click, the listener calls the function setTitle passing on the value from the input element

	// 2. the preload defines the function that will be called by setTitle and pass on the title sending the event set-title

	// 3. the main attaches a listener for the event set-title
	// that will get the title an put it into the browser window title
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
	<title>Hello World!</title>
	</head>
	<body>
	Title: <input id="title"/>
	<button id="btn" type="button">Set</button>
	<script src="./renderer.js"></script>
	</body>
	</html>
	const {app, BrowserWindow, ipcMain} = require('electron')
	const path = require('path')

	function createWindow () {
	const mainWindow = new BrowserWindow({
	webPreferences: {
	preload: path.join(__dirname, 'preload.js')
	}
	})

	// 3. the main attaches a listener for the event set-title
	// that will get the title an put it into the browser window title
	ipcMain.on('set-title', (event, title) => {
	const webContents = event.sender
	const win = BrowserWindow.fromWebContents(webContents)
	win.setTitle(title)
	})

	mainWindow.loadFile('index.html')
	}

	app.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	if (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})
	{
	"name": "five-chocolate-verify-9v1cn",
	"productName": "five-chocolate-verify-9v1cn",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "rudifarkas",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "21.2.0"
	}
	}
	// 2. the preload defines the function that will be called by setTitle and pass on the title sending the event set-title

	const { contextBridge, ipcRenderer } = require('electron')

	contextBridge.exposeInMainWorld('electronAPI', {
	setTitle: (title) => ipcRenderer.send('set-title', title)
	})
	// 1. the renderer attaches a listener to the button defined in the html file
	// . on user click, the listener calls the function setTitle passing on the value from the input element

	const setButton = document.getElementById('btn')
	const titleInput = document.getElementById('title')
	setButton.addEventListener('click', () => {
	const title = titleInput.value
	window.electronAPI.setTitle(title)
	});
	/* styles.css */

	/* Add styles here to customize the appearance of your app */