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    akey-electron-screenshots

electron 截图插件


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Maintainers
2
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1.07 MB
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electron-screenshots

electron 截图插件

Prerequisites

  • electron >= 11

Install

NPM

Usage

import debug from 'electron-debug'
import { app, globalShortcut } from 'electron'
import Screenshots from './screenshots'

app.whenReady().then(() => {
  const screenshots = new Screenshots()
  globalShortcut.register('ctrl+shift+a', () => {
    screenshots.startCapture()
    screenshots.$view.webContents.openDevTools()
  })
  // 点击确定按钮回调事件
  screenshots.on('ok', (e, buffer, bounds) => {
    console.log('capture', buffer, bounds)
  })
  // 点击取消按钮回调事件
  screenshots.on('cancel', () => {
    console.log('capture', 'cancel1')
  })
  screenshots.on('cancel', e => {
    // 执行了preventDefault
    // 点击取消不会关闭截图窗口
    e.preventDefault()
    console.log('capture', 'cancel2')
  })
  // 点击保存按钮回调事件
  screenshots.on('save', (e, buffer, bounds) => {
    console.log('capture', buffer, bounds)
  })
  debug({ showDevTools: true, devToolsMode: 'undocked' })
})

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

注意

  • 如果使用了 webpack 打包主进程,请在主进程 webpack 配置中修改如下配置,否则可能会出现不能调用截图窗口的情况
{
  externals: {
    'electron-screenshots': 'require("electron-screenshots")'
  }
}
// vue.config.js
module.exports = {
  publicPath: '.',
  pluginOptions: {
    electronBuilder: {
      // 不打包,使用 require 加载
      externals: ['electron-screenshots']
    }
  }
}
  • esc 取消截图,可用以下代码实现按 esc 取消截图
globalShortcut.register('esc', () => {
  if (screenshots.$win?.isFocused()) {
    screenshots.endCapture()
  }
})
  • 加速截图界面展示,不销毁BrowserWindow,减少创建窗口的开销,可用以下代码实现。需注意,启用该功能,会导致window-all-closed事件不触发,因此需要手动关闭截图窗口
// 是否复用截图窗口,加快截图窗口显示,默认值为 false
// 如果设置为 true 则会在第一次调用截图窗口时创建,后续调用时直接使用
// 且由于窗口不会 close,所以不会触发 app 的 `window-all-closed` 事件
const screenshots = new Screenshots({
  singleWindow: true
})

Methods

  • Debugger类型产考debug中的Debugger类型
export type LoggerFn = (...args: unknown[]) => void
export type Logger = Debugger | LoggerFn

export interface Lang {
  magnifier_position_label?: string
  operation_ok_title?: string
  operation_cancel_title?: string
  operation_save_title?: string
  operation_redo_title?: string
  operation_undo_title?: string
  operation_mosaic_title?: string
  operation_text_title?: string
  operation_brush_title?: string
  operation_arrow_title?: string
  operation_ellipse_title?: string
  operation_rectangle_title?: string
}

export interface ScreenshotsOpts {
  lang?: Lang
  // 调用日志,默认值为 debug('electron-screenshots')
  // debug https://www.npmjs.com/package/debug
  logger?: Logger
  // 是否复用截图窗口,加快截图窗口显示,默认值为 false
  // 如果设置为 true 则会在第一次调用截图窗口时创建,后续调用时直接使用
  // 且由于窗口不会 close,所以不会触发 app 的 `window-all-closed` 事件
  singleWindow?: boolean
}
名称说明返回值
constructor(opts: ScreenshotsOpts): Screenshots调用截图方法截图-
startCapture(): Promise<void>调用截图方法截图-
endCapture(): Promise<void>手动结束截图-
setLang(lang: Lang): Promise<void>修改语言-

Events

  • 数据类型
interface Bounds {
  x: number
  y: number
  width: number
  height: number
}

export interface Display {
  id: number
  x: number
  y: number
  width: number
  height: number
}

export interface ScreenshotsData {
  bounds: Bounds
  display: Display
}

class Event {
  public defaultPrevented = false

  public preventDefault(): void {
    this.defaultPrevented = true
  }
}
名称说明回调参数
ok截图确认事件(event: Event, buffer: Buffer, data: ScreenshotsData) => void
cancel截图取消事件(event: Event) => void
save截图保存事件(event: Event, buffer: Buffer, data: ScreenshotsData) => void

说明

  • event: 事件对象
  • buffer: png 图片 buffer
  • bounds: 截图区域信息
  • display: 截图的屏幕
  • event对象可调用preventDefault方法来阻止默认事件,例如阻止默认保存事件
const screenshots = new Screenshots({
  lang: {
    magnifier_position_label: 'Position',
    operation_ok_title: 'Ok',
    operation_cancel_title: 'Cancel',
    operation_save_title: 'Save',
    operation_redo_title: 'Redo',
    operation_undo_title: 'Undo',
    operation_mosaic_title: 'Mosaic',
    operation_text_title: 'Text',
    operation_brush_title: 'Brush',
    operation_arrow_title: 'Arrow',
    operation_ellipse_title: 'Ellipse',
    operation_rectangle_title: 'Rectangle'
  }
})

screenshots.on('save', (e, buffer, data) => {
  // 阻止插件自带的保存功能
  // 用户自己控制保存功能
  e.preventDefault()
  // 用户可在这里自己定义保存功能
  console.log('capture', buffer, data)
})

screenshots.startCapture()

Screenshot

screenshot

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Last updated on 11 Dec 2023

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