這里給大家分享我在網上總結出來的一些知識,希望對大家有所幫助
背景
因為我們日常開發專案的時候,需要和同事對接api
和檔案
還有UI圖
,所以有時候要同時打開多個視窗,并在多個視窗中切換,來選擇自己要的資訊,如果api
和檔案
不多的情況還好,但是有時候就是要做大量的頁面,為了提升效率我決定自己做一個截圖工具,并把自己要的資訊截圖釘在視窗上,
在做之前先看看最終展示效果吧:
- 先是截圖
- 截圖后的圖片展示
工具
- nodejs
- pnpm
- electron
- vite
- react
實作
原理邏輯
其實也并不難理解,首先是主表單發起截圖請求,然后會打開另一個負責截圖透明且全屏的表單,喚起后透明表單會讓electron截取整個螢屏發給邏輯頁面,頁面會把圖片繪制滿屏實作定格效果,然后再用canvas做繪制區域的生成,根據生成出的區域對剛才滿屏圖片進行裁切匯出,最后傳遞給主表單去顯示還可以存到剪貼板種,
具體的api可以看看官方檔案: www.electronjs.org/zh/docs/lat…
路由配置
本次開發使用了electron-vite-react
,具體構建和配置就是用它的默認配置就好了,值得注意的是,本次需要要做三個表單,一個主表單,一個截屏表單,一個是圖片展示表單,于是索性就引入react-router-dom
了,
先來安裝一下:
git clone https://github.com/electron-vite/electron-vite-react pnpm add react-router-dom pnpm add antd但是要注意的是,我們需要把路由設定成hash模式,不然本地打包時會無法找到,
import type { FC } from "react"; import { Routes, Route } from "react-router-dom"; import { Provider } from "react-redux"; import { store } from "@/stores"; import "./index.scss"; import Home from "@/pages/home"; import ShotScreen from "@/pages/shotScreen"; import ViewImage from "@/pages/viewImage"; const App: FC = () => ( <Provider store={store}> <div className="app"> <Routes> <Route path="/" element={<Home />}></Route> <Route path="/shotScreen" element={<ShotScreen />}></Route> <Route path="/viewImage" element={<ViewImage />}></Route> </Routes> </div> </Provider> ); export default App;
主表單
我們先準備好主頁面Home,里面很簡單,就是放入一個按鈕然后點擊按鈕開打截屏頁
import React, { useEffect, useState, useImperativeHandle, forwardRef, } from "react"; import { ScissorOutlined } from "@ant-design/icons"; import { Button, Card } from "antd"; import { ipcRenderer } from "electron"; const ShotScreenCard = forwardRef((props: any, ref: any) => { useImperativeHandle(ref, () => ({ handleCutScreen, })); const [isCutScreen, setIsCutScreen] = useState(true); function handleCutScreen() { ipcRenderer.send("ss:open-win"); } return ( <Card title="截屏" hoverable bordered={false} extra={<a href="https://www.cnblogs.com/smileZAZ/archive/2023/07/07/#">更多</a>} style={{ maxWidth: 300 }} onClick={handleCutScreen} > <div className="cardContent"> <ScissorOutlined /> </div> </Card> ); }); export default ShotScreenCard;
截圖頁
在這里我也嘗試過自己用Konva
自己手寫一個截圖頁,但是功能實在太多了,最后還是放棄了,如果大家有興趣可以自己嘗試,在這里我介紹兩個不多的插件:
- react-screenshots: github.com/nashaofu/sc…
- js-web-screen-shot github.com/likaia/js-s…
這樣截圖頁很簡單,我們使用react-screenshots
來幫我們實作截圖功能,代碼如下:
import React, { useCallback, useEffect, useState } from "react"; import Screenshots, { Bounds } from "react-screenshots"; import { ipcRenderer } from "electron"; import "react-screenshots/lib/style.css"; import "./index.scss"; export default function ShotScreen() { const [screenShotImg, setScreenShotImg] = useState(""); useEffect(() => { getShotScreenImg(); }, []); async function getShotScreenImg() { const img = await ipcRenderer.invoke("ss:get-shot-screen-img"); setScreenShotImg(img); return img; } const onSave = useCallback((blob: Blob, bounds: Bounds) => { const downloadUrl = URL.createObjectURL(blob); ipcRenderer.send("ss:download-img", downloadUrl); }, []); const onCancel = useCallback(() => { ipcRenderer.send("ss:close-win"); }, []); const onOk = useCallback((blob: Blob, bounds: Bounds) => { const downloadUrl = URL.createObjectURL(blob); ipcRenderer.send("ss:save-img", downloadUrl); }, []); return ( <Screenshots url={screenShotImg} width={window.innerWidth} height={window.innerHeight} onSave={onSave} onCancel={onCancel} onOk={onOk} /> ); }
electron 通訊
web頁面和electron 之間需要通訊,來獲取螢屏的圖片,具體可以看檔案:www.electronjs.org/zh/docs/lat…, 代碼入下:
// 截圖 ipcMain.handle("ss:get-shot-screen-img", async () => { const { width, height } = getScreenSize(); const sources = [ ...(await desktopCapturer.getSources({ types: ["screen"], thumbnailSize: { width, height, }, })), ]; const source = sources.filter((e: any) => e.id == "screen:0:0")[0]; const img = source.thumbnail.toDataURL(); return img; }); ipcMain.on("ss:open-win", () => { closeShotScreenWin(); hideMainWin(); openShotScreenWin(); }); ipcMain.on("ss:close-win", () => { closeShotScreenWin(); }); ipcMain.on("ss:save-img", async (e, downloadUrl) => { downloadURLShotScreenWin(downloadUrl); await openViewImageWin(true); }); ipcMain.on("ss:download-img", async (e, downloadUrl) => { downloadURLShotScreenWin(downloadUrl, true); }); ipcMain.handle("ss:get-desktop-capturer-source", async () => { return [ ...(await desktopCapturer.getSources({ types: ["screen"] })), ...(await selfWindws()), ]; });
截圖視窗的設定
截圖視窗就像一個100%透明的玻璃浮在我們的電腦螢屏上,這時候我們就要設定他的 width:100%,height:100%
,不可移動,并且透明,具體配置如下:
import { app, BrowserWindow, shell, dialog, DownloadItem, WebContents, clipboard, nativeImage, } from "electron"; import path from "node:path"; import { getScreenSize, preload, url, indexHtml, PUBLIC } from "./utils"; import { getFilePath, setHistoryImg } from "./store"; let shotScreenWin: BrowserWindow | null = null; let savePath: string = ""; function createShotScreenWin(): BrowserWindow { const { width, height } = getScreenSize(); shotScreenWin = new BrowserWindow({ title: "pear-rec 截屏", icon: path.join(PUBLIC, "[email protected]"), width, // 寬度(px), 默認值為 800 height, // 高度(px), 默認值為 600 autoHideMenuBar: true, // 自動隱藏選單欄 useContentSize: true, // width 和 height 將設定為 web 頁面的尺寸 movable: false, // 是否可移動 frame: false, // 無邊框視窗 resizable: false, // 視窗大小是否可調整 hasShadow: false, // 視窗是否有陰影 transparent: true, // 使視窗透明 fullscreenable: true, // 視窗是否可以進入全屏狀態 fullscreen: true, // 視窗是否全屏 simpleFullscreen: true, // 在 macOS 上使用 pre-Lion 全屏 alwaysOnTop: false, // 視窗是否永遠在別的視窗的上面 webPreferences: { preload, nodeIntegration: true, contextIsolation: false, }, }); // shotScreenWin.webContents.openDevTools(); if (url) { shotScreenWin.loadURL(url + "#/shotScreen"); } else { shotScreenWin.loadFile(indexHtml, { hash: "shotScreen", }); } shotScreenWin.maximize(); shotScreenWin.setFullScreen(true); shotScreenWin?.webContents.session.on( "will-download", (e: any, item: DownloadItem, webContents: WebContents) => { const fileName = item.getFilename(); const filePath = getFilePath() as string; const ssFilePath = path.join(savePath || `${filePath}/ss`, `${fileName}`); item.setSavePath(ssFilePath); item.once("done", (event: any, state: any) => { if (state === "completed") { copyImg(ssFilePath); setHistoryImg(ssFilePath); setTimeout(() => { closeShotScreenWin(); // shell.showItemInFolder(ssFilePath); }, 1000); } }); }, ); return shotScreenWin; } // 打開關閉錄屏視窗 function closeShotScreenWin() { shotScreenWin?.isDestroyed() || shotScreenWin?.close(); shotScreenWin = null; } function openShotScreenWin() { if (!shotScreenWin || shotScreenWin?.isDestroyed()) { shotScreenWin = createShotScreenWin(); } shotScreenWin?.show(); } function showShotScreenWin() { shotScreenWin?.show(); } function hideShotScreenWin() { shotScreenWin?.hide(); } function minimizeShotScreenWin() { shotScreenWin?.minimize(); } function maximizeShotScreenWin() { shotScreenWin?.maximize(); } function unmaximizeShotScreenWin() { shotScreenWin?.unmaximize(); } async function downloadURLShotScreenWin( downloadUrl: string, isShowDialog?: boolean, ) { savePath = ""; isShowDialog && (savePath = await showOpenDialogShotScreenWin()); shotScreenWin?.webContents.downloadURL(downloadUrl); } async function showOpenDialogShotScreenWin() { let res = await dialog.showOpenDialog({ properties: ["openDirectory"], }); const savePath = res.filePaths[0] || ""; return savePath; } function copyImg(filePath: string) { const image = nativeImage.createFromPath(filePath); clipboard.writeImage(image); } export { createShotScreenWin, closeShotScreenWin, openShotScreenWin, showShotScreenWin, hideShotScreenWin, minimizeShotScreenWin, maximizeShotScreenWin, unmaximizeShotScreenWin, downloadURLShotScreenWin, };
效果圖
總結Q&A
文章寫到這里基本結束了,簡單回顧下文章的內容,
- Q:為什么沒有用
Electron Forge
?
一開始我是使用Electron Forge
,但是最后放棄了,原因有兩個:1. 編譯太慢,不知道是不是webpack的原因,但是和vite比真的太慢了!!!2.Electron Forge
使用的是Electron Package
打包,也不太自定義,所以最后放棄,,
- Q: 有原始碼嗎?
當然有,地址如下:github.com/027xiguapi/…,有興趣的話可以大家一起探討,同時也歡迎大家fork
和star
本文轉載于:
https://juejin.cn/post/7239514481755127845
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