Electron: 主进程到渲染器进程

消息需要通过其 WebContents 实例发送到渲染器进程。

main.js

 const { app, BrowserWindow, Menu, ipcMain } = require('electron/main')
const path = require('node:path')
 
function createWindow () {
  const mainWindow = new BrowserWindow({
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })
 
  const menu = Menu.buildFromTemplate([
    {
      label: app.name,
      submenu: [
        {
          click: () => mainWindow.webContents.send('update-counter', 1),
          label: 'Increment'
        },
        {
          click: () => mainWindow.webContents.send('update-counter', -1),
          label: 'Decrement'
        }
      ]
    }
 
  ])
 
  Menu.setApplicationMenu(menu)
  mainWindow.loadFile('index.html')
 
  // Open the DevTools.
  mainWindow.webContents.openDevTools()
}
 
app.whenReady().then(() => {
  ipcMain.on('counter-value', (_event, value) => {
    console.log(value) // will print value to Node console
  })
  createWindow()
 
  app.on('activate', function () {
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})
 
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

preload.js

 const { contextBridge, ipcRenderer } = require('electron/renderer')
 
contextBridge.exposeInMainWorld('electronAPI', {
  onUpdateCounter: (callback) => ipcRenderer.on('update-counter', (_event, value) => callback(value)),
  counterValue: (value) => ipcRenderer.send('counter-value', value)
})

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>Menu Counter</title>
  </head>
  <body>
    Current value: <strong id="counter">0</strong>
    <script src="./renderer.js"></script>
  </body>
</html>

renderer.js

 const counter = document.getElementById('counter')
 
window.electronAPI.onUpdateCounter((value) => {
  const oldValue = Number(counter.innerText)
  const newValue = oldValue + value
  counter.innerText = newValue.toString()
  window.electronAPI.counterValue(newValue)
})

posted @ 2024-11-04 18:41 Felix_Openmind 阅读(63) 评论(0) 编辑收藏举报

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相关博文：

· Electron：渲染器进程到主进程（单向）

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Electron: 主进程到渲染器进程

main.js

preload.js

index.html

renderer.js

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软件开发

阅读排行榜

	const { app, BrowserWindow, Menu, ipcMain } = require('electron/main')
	const path = require('node:path')

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

	const menu = Menu.buildFromTemplate([
	{
	label: app.name,
	submenu: [
	{
	click: () => mainWindow.webContents.send('update-counter', 1),
	label: 'Increment'
	},
	{
	click: () => mainWindow.webContents.send('update-counter', -1),
	label: 'Decrement'
	}
	]
	}

	])

	Menu.setApplicationMenu(menu)
	mainWindow.loadFile('index.html')

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

	app.whenReady().then(() => {
	ipcMain.on('counter-value', (_event, value) => {
	console.log(value) // will print value to Node console
	})
	createWindow()

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

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

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

	contextBridge.exposeInMainWorld('electronAPI', {
	onUpdateCounter: (callback) => ipcRenderer.on('update-counter', (_event, value) => callback(value)),
	counterValue: (value) => ipcRenderer.send('counter-value', value)
	})


	<!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>Menu Counter</title>
	</head>
	<body>
	Current value: <strong id="counter">0</strong>
	<script src="./renderer.js"></script>
	</body>
	</html>

	const counter = document.getElementById('counter')

	window.electronAPI.onUpdateCounter((value) => {
	const oldValue = Number(counter.innerText)
	const newValue = oldValue + value
	counter.innerText = newValue.toString()
	window.electronAPI.counterValue(newValue)
	})