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electron-screenshots

v0.5.27

Published

electron 截图插件

Downloads

394

Readme

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);
  });
  // 保存后的回调事件
  screenshots.on("afterSave", (e, buffer, bounds, isSaved) => {
    console.log("capture", buffer, bounds);
    console.log("isSaved", isSaved) // 是否保存成功
  });
  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 | | afterSave | 截图保存(取消保存)后的事件 | (event: Event, buffer: Buffer, data: ScreenshotsData, isSaved: boolean) => void | | windowCreated | 截图窗口被创建后触发 | ($win: BrowserWindow) => void | | windowClosed | 截图窗口被关闭后触发,对BrowserWindow closed 事件的转发 | ($win: BrowserWindow) => 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