Add startScreencast()/stopScreencast()

README.md

@@ -196,10 +196,25 @@ See examples: [examples/screenshot.js]
 
 ##### .pdf()
 
-It export a current screen as a PDF data. 
+It export a current screen as a PDF data.
 
 See examples: [examples/screenshot.js]
 
+##### .startScreencast(callback, options = {})
+
+Starts screencast to take screenshots by every frame.
+
+See examples: [examples/screencast.js]
+
+###### Parameter
+
+callback: callback function for receiving parameters of screencastFrame event. See details [here](https://chromedevtools.github.io/devtools-protocol/tot/Page/#event-screencastFrame)
+options: See details [here](https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-startScreencast).
+
+##### .stopScreencast()
+
+Stops screencast.
+
 ##### .console(func)
 
 ```js

examples/screencast.js

@@ -0,0 +1,22 @@
+const Chromy = require('../src')
+const path = require('path')
+
+let chromy = new Chromy()
+chromy.chain()
+ .goto(path.join('file:https://', __dirname, '/pages/index.html'))
+ .startScreencast(async (payload) => {
+ console.log(payload.data.length)
+ }, {format: 'jpeg', quality: 50})
+ .evaluate(_ => {
+ setInterval(_ => {
+ var s = document.createElement('span')
+ s.innerHTML = 'foo'
+ document.body.appendChild(s)
+ }, 50)
+ })
+ .sleep(1000)
+ .stopScreencast()
+ .sleep(1000)
+ .end()
+ .then(_ => chromy.close())
+ .catch(_ => {console.log(_); chromy.close()})

package.json

@@ -1,6 +1,6 @@
 {
  "name": "chromy",
- "version": "0.1.24",
+ "version": "0.1.25",
  "description": "a library for controlling headless chrome by nightmarejs like API.",
  "main": "src/index.js",
  "directories": {

src/index.js

@@ -457,6 +457,18 @@ class Chromy {
  return Buffer.from(data, 'base64')
  }
 
+ async startScreencast (callback, options = {}) {
+ await this.client.Page.screencastFrame(async (payload) => {
+ await callback.apply(this, [payload])
+ await this.client.Page.screencastFrameAck({sessionId: payload.sessionId})
+ })
+ await this.client.Page.startScreencast(options)
+ }
+
+ async stopScreencast () {
+ await this.client.Page.stopScreencast()
+ }
+
  async emulate (deviceName) {
  await this.checkStart()
 
@@ -520,7 +532,6 @@ class Chromy {
  if (origin === null) {
  origin = await this.evaluate(_ => { return location.origin })
  }
- console.log(origin)
  return await this.client.Storage.clearDataForOrigin({origin: origin, storageTypes: type})
  }