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Modo oscuro

Descripción general

Actualizar automáticamente las interfaces nativas

"Interfaces nativas" incluyen el selector de archivos, borde de ventana, diálogos, menús contextuales, y más - cualquier cosa en la que la interfaz de usuario provenga de su sistema operativo y no de tu aplicación. El comportamiento predeterminado es optar por el tema automático del sistema operativo.

Actualizando automáticamente tus propias interfaces

Si tu aplicación tiene su propio modo oscuro deberías activarlo o desactivarlo dependiendo de la configuración de modo oscuro del sistema. Puede hacer esto usando la consulta de medios CSS [prefer-color-scheme].

Actualizando manualmente tus propias interfaces

Si quieres cambiar manualmente entre los modos light/dark, puedes hacerlo configurando el modo deseado en la propiedad themeSource del módulo nativeTheme. El valor de esta propiedad se propagará a tu proceso de renderizado. Cualquier regla CSS relacionada con prefers-color-scheme será actualizada en consecuencia.

configuraciones macOS

En macOS 10.14 Mojave, Apple introdujo un nuevo modo oscuro para todo el sistema en sus ordenadores macOS. Si tu aplicación tiene un modo oscuro, puedes hacer que siga el modo oscuro del sistema usando la api nativeTheme.

En macOS 10.15 Catalina, Apple introdujo una nueva opción de modo oscuro "automático" para todas las computadoras macOS. In order for the nativeTheme.shouldUseDarkColors and Tray APIs to work correctly in this mode on Catalina, you need to use Electron >=7.0.0, or set NSRequiresAquaSystemAppearance to false in your Info.plist file for older versions. Tanto Electron Packager y Electron Forge tienen un opción darwinDarkModeSupport para automatizar los cambios en Info.plist durante el tiempo de construcción de la aplicación.

If you wish to opt-out while using Electron > 8.0.0, you must set the NSRequiresAquaSystemAppearance key in the Info.plist file to true. Please note that Electron 8.0.0 and above will not let you opt-out of this theming, due to the use of the macOS 10.14 SDK.

Ejemplo

Este ejemplo demuestra una aplicación Electron que deriva sus colores del tema nativeTheme. Additionally, it provides theme toggle and reset controls using IPC channels.

const { app, BrowserWindow, ipcMain, nativeTheme } = require('electron')
const path = require('path')

function createWindow () {
const win = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
preload: path.join(__dirname, 'preload.js')
}
})

win.loadFile('index.html')

ipcMain.handle('dark-mode:toggle', () => {
if (nativeTheme.shouldUseDarkColors) {
nativeTheme.themeSource = 'light'
} else {
nativeTheme.themeSource = 'dark'
}
return nativeTheme.shouldUseDarkColors
})

ipcMain.handle('dark-mode:system', () => {
nativeTheme.themeSource = 'system'
})
}

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

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

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

How does this work?

Starting with the index.html file:

index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Hello World!</title>
<meta http-equiv="Content-Security-Policy" content="script-src 'self' 'unsafe-inline';" />
<link rel="stylesheet" type="text/css" href="./styles.css">
</head>
<body>
<h1>Hello World!</h1>
<p>Current theme source: <strong id="theme-source">System</strong></p>

<button id="toggle-dark-mode">Toggle Dark Mode</button>
<button id="reset-to-system">Reset to System Theme</button>

<script src="renderer.js"></script>
</body>
</body>
</html>

And the styles.css file:

styles.css
@media (prefers-color-scheme: dark) {
body { background: #333; color: white; }
}

@media (prefers-color-scheme: light) {
body { background: #ddd; color: black; }
}

The example renders an HTML page with a couple elements. The <strong id="theme-source"> element shows which theme is currently selected, and the two <button> elements are the controls. The CSS file uses the prefers-color-scheme media query to set the <body> element background and text colors.

The preload.js script adds a new API to the window object called darkMode. Esta API expone dos canales IPC al proceso de renderizado, 'dark-mode:toggle' y 'dark-mode:system'. It also assigns two methods, toggle and system, which pass messages from the renderer to the main process.

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

contextBridge.exposeInMainWorld('darkMode', {
toggle: () => ipcRenderer.invoke('dark-mode:toggle'),
system: () => ipcRenderer.invoke('dark-mode:system')
})

Now the renderer process can communicate with the main process securely and perform the necessary mutations to the nativeTheme object.

The renderer.js file is responsible for controlling the <button> functionality.

renderer.js
document.getElementById('toggle-dark-mode').addEventListener('click', async () => {
const isDarkMode = await window.darkMode.toggle()
document.getElementById('theme-source').innerHTML = isDarkMode ? 'Dark' : 'Light'
})

document.getElementById('reset-to-system').addEventListener('click', async () => {
await window.darkMode.system()
document.getElementById('theme-source').innerHTML = 'System'
})

Using addEventListener, the renderer.js file adds 'click' event listeners to each button element. Each event listener handler makes calls to the respective window.darkMode API methods.

Finally, the main.js file represents the main process and contains the actual nativeTheme API.

const { app, BrowserWindow, ipcMain, nativeTheme } = require('electron')
const path = require('path')

const createWindow = () => {
const win = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
preload: path.join(__dirname, 'preload.js')
}
})

win.loadFile('index.html')

ipcMain.handle('dark-mode:toggle', () => {
if (nativeTheme.shouldUseDarkColors) {
nativeTheme.themeSource = 'light'
} else {
nativeTheme.themeSource = 'dark'
}
return nativeTheme.shouldUseDarkColors
})

ipcMain.handle('dark-mode:system', () => {
nativeTheme.themeSource = 'system'
})
}

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

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

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

The ipcMain.handle methods are how the main process responds to the click events from the buttons on the HTML page.

The 'dark-mode:toggle' IPC channel handler method checks the shouldUseDarkColors boolean property, sets the corresponding themeSource, and then returns the current shouldUseDarkColors property. Looking back on the renderer process event listener for this IPC channel, the return value from this handler is utilized to assign the correct text to the <strong id='theme-source'> element.

The 'dark-mode:system' IPC channel handler method assigns the string 'system' to the themeSource and returns nothing. This also corresponds with the relative renderer process event listener as the method is awaited with no return value expected.

Run the example using Electron Fiddle and then click the "Toggle Dark Mode" button; the app should start alternating between a light and dark background color.

Modo oscuro