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原生文件拖 & 放

概览​

作为桌面程序，当然希望能够实现操作系统的 drag & drop 功能。 很多网站已经支持拖拽文件， Electron 当然也支持

To implement this feature in your app, you need to call the webContents.startDrag(item) API in response to the ondragstart event.

示例​

一个演示如何动态创建要从窗口中拖出的文件的示例。

Preload.js​

In preload.js use the contextBridge to inject a method window.electron.startDrag(...) that will send an IPC message to the main process.

const { contextBridge, ipcRenderer } = require('electron')
const path = require('node:path')

contextBridge.exposeInMainWorld('electron', {
  startDrag: (fileName) => {
    ipcRenderer.send('ondragstart', path.join(process.cwd(), fileName))
  }
})

Index.html​

添加一个可拖动元素到 index.html, 并引用你的渲染器脚本：

<div style="border:2px solid black;border-radius:3px;padding:5px;display:inline-block" draggable="true" id="drag">拖动我</div>
<script src="renderer.js"></script>

Renderer.js​

In renderer.js set up the renderer process to handle drag events by calling the method you added via the contextBridge above.

document.getElementById('drag').ondragstart = (event) => {
  event.preventDefault()
  window.electron.startDrag('drag-and-drop.md')
}

Main.js​

在主进程中(main.js 文件)，将收到的事件带上文件路径和图标扩展到正在拖动的文件：

docs/fiddles/features/drag-and-drop (33.2.1)Open in Fiddle
const { app, BrowserWindow, ipcMain } = require('electron/main')
const path = require('node:path')
const fs = require('node:fs')
const https = require('node:https')

function createWindow () {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  win.loadFile('index.html')
}

const iconName = path.join(__dirname, 'iconForDragAndDrop.png')
const icon = fs.createWriteStream(iconName)

// Create a new file to copy - you can also copy existing files.
fs.writeFileSync(path.join(__dirname, 'drag-and-drop-1.md'), '# First file to test drag and drop')
fs.writeFileSync(path.join(__dirname, 'drag-and-drop-2.md'), '# Second file to test drag and drop')

https.get('https://img.icons8.com/ios/452/drag-and-drop.png', (response) => {
  response.pipe(icon)
})

app.whenReady().then(createWindow)

ipcMain.on('ondragstart', (event, filePath) => {
  event.sender.startDrag({
    file: path.join(__dirname, filePath),
    icon: iconName
  })
})

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

app.on('activate', () => {
  if (BrowserWindow.getAllWindows().length === 0) {
    createWindow()
  }
})

启动 Electron 应用程序后，尝试将该项从 BrowserWindow 拖放到桌面上。 在本指南中，本项是位于项目根目录下的 Markdown 文件：

拖放