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docs: update drag and drop tutorial (#29200)

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* Working

* Working

* Make the native-file drag and drop documents use context bridge

* Add per-file sections

* Use the updated link format

* Use path.join instead of string interpolation.

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>

* Use fs.promises

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>

* Update docs/tutorial/native-file-drag-drop.md

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>

* fix formatting

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>

* Update docs/tutorial/native-file-drag-drop.md

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>

* Use more path.join instead of interpolation

* Update with PR suggestions

* Remove process.cwd() and add more example elements

* Minor text fix

* Fix typo

Co-authored-by: Erick Zhao <erick@hotmail.ca>

Co-authored-by: Antón Molleda <molant@users.noreply.github.com>
Co-authored-by: Erick Zhao <erick@hotmail.ca>
This commit is contained in:
Tony Ferrell 2021-05-18 17:55:24 -07:00 committed by GitHub
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5 changed files with 63 additions and 33 deletions
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9
docs/fiddles/features/drag-and-drop/index.html
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@ -7,12 +7,9 @@
</head>
<body>
<h1>Hello World!</h1>
<p>
We are using node <script>document.write(process.versions.node)</script>,
Chrome <script>document.write(process.versions.chrome)</script>,
and Electron <script>document.write(process.versions.electron)</script>.
</p>
<a href="#" id="drag">Drag me</a>
<p>Drag the boxes below to somewhere in your OS (Finder/Explorer, Desktop, etc.) to copy an example markdown file.</p>
<div style="border:2px solid black;border-radius:3px;padding:5px;display:inline-block" draggable="true" id="drag1">Drag me - File 1</div>
<div style="border:2px solid black;border-radius:3px;padding:5px;display:inline-block" draggable="true" id="drag2">Drag me - File 2</div>
<script src="renderer.js"></script>
</body>
</html>

25
docs/fiddles/features/drag-and-drop/main.js
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@ -1,21 +1,28 @@
const { app, BrowserWindow, ipcMain, nativeImage, NativeImage } = require('electron')
const fs = require('fs');
const http = require('http');
const path = require('path')
const fs = require('fs')
const https = require('https')
function createWindow () {
function createWindow() {
const win = new BrowserWindow({
width: 800,
height: 600,
webPreferences: {
nodeIntegration: true
preload: path.join(__dirname, 'preload.js')
}
})
win.loadFile('index.html')
}
const iconName = 'iconForDragAndDrop.png';
const icon = fs.createWriteStream(`${process.cwd()}/${iconName}`);
http.get('http://img.icons8.com/ios/452/drag-and-drop.png', (response) => {
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);
});
@ -23,8 +30,8 @@ app.whenReady().then(createWindow)
ipcMain.on('ondragstart', (event, filePath) => {
event.sender.startDrag({
file: filePath,
icon: `${process.cwd()}/${iconName}`
file: path.join(__dirname, filePath),
icon: iconName,
})
})

8
docs/fiddles/features/drag-and-drop/preload.js Normal file
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@ -0,0 +1,8 @@
const { contextBridge, ipcRenderer } = require('electron')
const path = require('path')
contextBridge.exposeInMainWorld('electron', {
startDrag: (fileName) => {
ipcRenderer.send('ondragstart', fileName)
}
})

14
docs/fiddles/features/drag-and-drop/renderer.js
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@ -1,9 +1,9 @@
const { ipcRenderer } = require('electron')
const fs = require('fs')
document.getElementById('drag').ondragstart = (event) => {
const fileName = 'drag-and-drop.md'
fs.writeFileSync(fileName, '# Test drag and drop');
document.getElementById('drag1').ondragstart = (event) => {
event.preventDefault()
ipcRenderer.send('ondragstart', process.cwd() + `/${fileName}`)
window.electron.startDrag('drag-and-drop-1.md')
}
document.getElementById('drag2').ondragstart = (event) => {
event.preventDefault()
window.electron.startDrag('drag-and-drop-2.md')
}

40
docs/tutorial/native-file-drag-drop.md
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@ -14,30 +14,46 @@ API in response to the `ondragstart` event.
## Example
Starting with a working application from the
[Quick Start Guide](quick-start.md), add the following lines to the
`index.html` file:
An example demonstrating how you can create a file on the fly to be dragged out of the window.
### 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.
```js
const { contextBridge, ipcRenderer } = require('electron')
const path = require('path')
contextBridge.exposeInMainWorld('electron', {
startDrag: (fileName) => {
ipcRenderer.send('ondragstart', path.join(process.cwd(), fileName))
}
})
```
### Index.html
Add a draggable element to `index.html`, and reference your renderer script:
```html
<a href="#" id="drag">Drag me</a>
<div style="border:2px solid black;border-radius:3px;padding:5px;display:inline-block" draggable="true" id="drag">Drag me</div>
<script src="renderer.js"></script>
```
and add the following lines to the `renderer.js` file:
### Renderer.js
In `renderer.js` set up the renderer process to handle drag events by calling the method you added via the [`contextBridge`] above.
```javascript
const { ipcRenderer } = require('electron')
document.getElementById('drag').ondragstart = (event) => {
event.preventDefault()
ipcRenderer.send('ondragstart', '/absolute/path/to/the/item')
window.electron.startDrag('drag-and-drop.md')
}
```
The code above instructs the Renderer process to handle the `ondragstart` event
and forward the information to the Main process.
### Main.js
In the Main process(`main.js` file), expand the received event with a path to the file that is
In the Main process (`main.js` file), expand the received event with a path to the file that is
being dragged and an icon:
```javascript fiddle='docs/fiddles/features/drag-and-drop'
@ -56,3 +72,5 @@ the item from the BrowserWindow onto your desktop. In this guide,
the item is a Markdown file located in the root of the project:
![Drag and drop](../images/drag-and-drop.gif)
[`contextBridge`]: ../api/context-bridge.md