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

要在 app 中实现此功能 ，你需要在 Render 进程中调用webContents.startDrag(item) API， 此API会给 Main 进程发送一个ondragstart事件。

在 Render 进程中, 接收 ondragstart 事件并发送消息到 Main 进程。

<a href="#" id="drag">item</a>
<script type="text/javascript" charset="utf-8">
  document.getElementById('drag').ondragstart = (event) => {
    event.preventDefault()
    ipcRenderer.send('ondragstart', '/path/to/item')
  }
</script>

然后, 在主进程中，接收拖拽过来的文件路径和在拖拽过程中要显示的图标。

const { ipcMain } = require('electron')
ipcMain.on('ondragstart', (event, filePath) => {
  event.sender.startDrag({
    file: filePath,
    icon: '/path/to/icon.png'
  })
})

Native File Drag & Drop

Certain kinds of applications that manipulate files might want to support the operating system's native file drag & drop feature. Dragging files into web content is common and supported by many websites. Electron additionally supports dragging files and content out from web content into the operating system's world.

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

In your renderer process, handle the ondragstart event and forward the information to your main process.

<a href="#" id="drag">item</a>
<script type="text/javascript" charset="utf-8">
  document.getElementById('drag').ondragstart = (event) => {
    event.preventDefault()
    ipcRenderer.send('ondragstart', '/path/to/item')
  }
</script>

Then, in the main process, augment the event with a path to the file that is being dragged and an icon.

const { ipcMain } = require('electron')
ipcMain.on('ondragstart', (event, filePath) => {
  event.sender.startDrag({
    file: filePath,
    icon: '/path/to/icon.png'
  })
})