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screen

Retrieve information about screen size, displays, cursor position, etc.

Prozess: Haupt

This module cannot be used until the ready event of the app module is emitted.

screen ist ein EventEmitter.

Note: In the renderer / DevTools, window.screen is a reserved DOM property, so writing let { screen } = require('electron') will not work.

An example of creating a window that fills the whole screen:

// Retrieve information about screen size, displays, cursor position, etc.
//
// For more info, see:
// https://electronjs.org/docs/api/screen

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

let mainWindow = null

app.whenReady().then(() => {
// We cannot require the screen module until the app is ready.
const { screen } = require('electron')

// Create a window that fills the screen's available work area.
const primaryDisplay = screen.getPrimaryDisplay()
const { width, height } = primaryDisplay.workAreaSize

mainWindow = new BrowserWindow({ width, height })
mainWindow.loadURL('https://electronjs.org')
})

Another example of creating a window in the external display:

const { app, BrowserWindow, screen } = require('electron')

let win

app.whenReady().then(() => {
const displays = screen.getAllDisplays()
const externalDisplay = displays.find((display) => {
return display.bounds.x !== 0 || display.bounds.y !== 0
})

if (externalDisplay) {
win = new BrowserWindow({
x: externalDisplay.bounds.x + 50,
y: externalDisplay.bounds.y + 50
})
win.loadURL('https://github.com')
}
})

Ereignisse

Das screen Modul sendet folgende Ereignisse aus:

Event: 'display-added'

Kehrt zurück:

Emitted when newDisplay has been added.

Event: 'display-removed'

Kehrt zurück:

Emitted when oldDisplay has been removed.

Event: 'display-metrics-changed'

Kehrt zurück:

  • event Event
  • display Display
  • changedMetrics string[]

Emitted when one or more metrics change in a display. The changedMetrics is an array of strings that describe the changes. Possible changes are bounds, workArea, scaleFactor and rotation.

Methoden

Das Modul screen verfügt über die folgenden Methoden:

screen.getCursorScreenPoint()

Returns Point

The current absolute position of the mouse pointer.

Note: The return value is a DIP point, not a screen physical point.

screen.getPrimaryDisplay()

Returns Display - The primary display.

screen.getAllDisplays()

Returns Display[] - An array of displays that are currently available.

screen.getDisplayNearestPoint(point)

Returns Display - The display nearest the specified point.

screen.getDisplayMatching(rect)

Returns Display - The display that most closely intersects the provided bounds.

screen.screenToDipPoint(point) Windows

Returns Point

Converts a screen physical point to a screen DIP point. The DPI scale is performed relative to the display containing the physical point.

screen.dipToScreenPoint(point) Windows

Returns Point

Converts a screen DIP point to a screen physical point. The DPI scale is performed relative to the display containing the DIP point.

screen.screenToDipRect(window, rect) Windows

Returns Rectangle

Converts a screen physical rect to a screen DIP rect. The DPI scale is performed relative to the display nearest to window. If window is null, scaling will be performed to the display nearest to rect.

screen.dipToScreenRect(window, rect) Windows

Returns Rectangle

Converts a screen DIP rect to a screen physical rect. The DPI scale is performed relative to the display nearest to window. If window is null, scaling will be performed to the display nearest to rect.