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screen

检索有关屏幕大小、显示器、光标位置等的信息。

Process: Main

在 app 模块 emitted ready 事件之前，您不能使用此模块。

screen是一个EventEmitter.

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

创建填充整个屏幕的窗口的示例:

docs/fiddles/screen/fit-screen (36.2.1)Open in Fiddle
// Retrieve information about screen size, displays, cursor position, etc.
//
// For more info, see:
// https://www.electronjs.org/docs/latest/api/screen

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

let mainWindow = null

app.whenReady().then(() => {
  // 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')
})

另一个在外部显示器中创建窗口的例子

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')
  }
})

[!NOTE] Screen coordinates used by this module are Point structures. There are two kinds of coordinates available to the process:

  • Physical screen points are raw hardware pixels on a display.
  • Device-independent pixel (DIP) points are virtualized screen points scaled based on the DPI (dots per inch) of the display.

事件​

screen模块触发以下事件:

Event: 'display-added'​

返回:

当新的窗口newDisplay被添加的时候触发。

Event: 'display-removed'​

返回:

当旧的窗口oldDisplay被移除的时候触发。

Event: 'display-metrics-changed'​

返回:

  • event Event
  • display Display
  • changedMetrics string[]

当display中的一个或多个值发生改变时发出。 changedMetrics是描述更改信息的字符串数组。 Possible changes are bounds, workArea, scaleFactor and rotation.

方法​

screen模块有以下方法:

screen.getCursorScreenPoint()​

Returns Point

当前鼠标的绝对位置。

[!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

将屏幕物理点转换为屏幕DIP点。 相对于物理点的显示执行DPI缩放

screen.dipToScreenPoint(point) Windows​

Returns Point

将屏幕DIP点转换为屏幕物理点。 相对于DPI的显示关系执行缩放

screen.screenToDipRect(window, rect) Windows​

Returns Rectangle

将屏幕物理矩阵转换为屏幕DIP矩阵。 相对最近于 window 的显示来执行DPI缩放。 如果 window 为空，将执行缩放到最近的 rect 的显示位置。

screen.dipToScreenRect(window, rect) Windows​

Returns Rectangle

将屏幕DIP矩阵转换为屏幕物理矩阵。 相对最近于 window 的显示来执行DPI缩放。 如果 window 为空，将执行缩放到最近的 rect 的显示位置。