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GetDisplayMedia: add Start/Stop switch #1616

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GetDisplayMedia: add Start/Stop switch #1616

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cc5adb5
GetDisplayMedia demo: make start button switch to stop button once sc…
eronnen Aug 20, 2023
00c3b80
use displayMediaStarted boolean
eronnen Oct 5, 2023
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38 changes: 25 additions & 13 deletions src/content/getusermedia/getdisplaymedia/js/main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,9 @@
'use strict';

const preferredDisplaySurface = document.getElementById('displaySurface');
const startButton = document.getElementById('startButton');
const startStopButton = document.getElementById('startButton');
const videoElement = document.querySelector('video');
let displayMediaStarted = false;

if (adapter.browserDetails.browser === 'chrome' &&
adapter.browserDetails.version >= 107) {
Expand All @@ -21,16 +23,16 @@ if (adapter.browserDetails.browser === 'chrome' &&
}

function handleSuccess(stream) {
startButton.disabled = true;
displayMediaStarted = true;
startStopButton.textContent = 'Stop';
preferredDisplaySurface.disabled = true;
const video = document.querySelector('video');
video.srcObject = stream;
videoElement.srcObject = stream;

// demonstrates how to detect that the user has stopped
// sharing the screen via the browser UI.
stream.getVideoTracks()[0].addEventListener('ended', () => {
errorMsg('The user has ended sharing the screen');
startButton.disabled = false;
startStopButton.textContent = 'Start';
preferredDisplaySurface.disabled = false;
});
}
Expand All @@ -48,18 +50,28 @@ function errorMsg(msg, error) {
}


startButton.addEventListener('click', () => {
const options = {audio: true, video: true};
const displaySurface = preferredDisplaySurface.options[preferredDisplaySurface.selectedIndex].value;
if (displaySurface !== 'default') {
options.video = {displaySurface};
startStopButton.addEventListener('click', () => {
if (!displayMediaStarted) {
const options = {audio: true, video: true};
const displaySurface = preferredDisplaySurface.options[preferredDisplaySurface.selectedIndex].value;
if (displaySurface !== 'default') {
options.video = {displaySurface};
}
navigator.mediaDevices.getDisplayMedia(options)
.then(handleSuccess, handleError);
}
else {
// demonstrates how to stop the stream from JavaScript
errorMsg('JavaScript has ended sharing the screen');
videoElement.srcObject.getTracks().forEach(track => track.stop());
videoElement.srcObject = null;
startStopButton.textContent = 'Start';
displayMediaStarted = false;
}
navigator.mediaDevices.getDisplayMedia(options)
.then(handleSuccess, handleError);
});

if ((navigator.mediaDevices && 'getDisplayMedia' in navigator.mediaDevices)) {
startButton.disabled = false;
startStopButton.disabled = false;
} else {
errorMsg('getDisplayMedia is not supported');
}