screen

检索有关屏幕大小、显示器、光标位置等的信息。

进程：主进程

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

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:

```javascript fiddle=’docs/fiddles/screen/fit-screen’const { app, BrowserWindow, screen } = require(‘electron’)

let winapp.on(‘ready’, () => { const { width, height } = screen.getPrimaryDisplay().workAreaSize win = new BrowserWindow({ width, height }) win.loadURL(‘https://github.com‘)})

另一个在外部显示器中创建窗口的例子
```javascript
const { app, BrowserWindow, screen } = require('electron')
let win
app.on('ready', () => {
  let displays = screen.getAllDisplays()
  let 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')
  }
})

事件

screen模块触发以下事件:

Event: ‘display-added’

返回:

• event Event
• newDisplay Display

当新的窗口newDisplay被添加的时候触发。

Event: ‘display-removed’

返回:

• event Event
• oldDisplay Display

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。 可能改变的值有bounds, workArea, scaleFactor 和 rotation.

方法

screen模块有以下方法:

screen.getCursorScreenPoint()

返回 Point

当前鼠标的绝对位置。

screen.getPrimaryDisplay()

返回主窗口Display

screen.getAllDisplays()

返回一个窗口数组Display[]，表示当前可用的窗口。

screen.getDisplayNearestPoint(point)

• point Point

返回离指定点最近的一个窗口Display

screen.getDisplayMatching(rect)

• rect Rectangle

返回离指定的图形最密切相交一个窗口Display

screen.screenToDipPoint(point) Windows

• point Point

返回 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

• point Point

返回 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

• window BrowserWindow | null
• rect Rectangle

返回 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

• window BrowserWindow | null
• rect Rectangle

返回 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.