Source code
Revision control
Copy as Markdown
Other Tools
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
"use strict";
// Hide our variables from the web content, even though the spec allows them
{
// <video> is used for top-level audio documents as well
let videoElement = document.getElementsByTagName("video")[0];
let setFocusToVideoElement = function (e) {
// We don't want to retarget focus if it goes to the controls in
// the video element. Because they're anonymous content, the target
// will be the video element in that case. Avoid calling .focus()
// for those events:
if (e && e.target == videoElement) {
return;
}
videoElement.focus();
};
// Redirect focus to the video element whenever the document receives
// focus.
document.addEventListener("focus", setFocusToVideoElement, true);
// Focus on the video in the newly created document.
setFocusToVideoElement();
// Opt out of moving focus away if the DOM tree changes (from add-on or web content)
let observer = new MutationObserver(() => {
observer.disconnect();
document.removeEventListener("focus", setFocusToVideoElement, true);
});
observer.observe(document.documentElement, {
childList: true,
subtree: true,
});
// Handle fullscreen mode
document.addEventListener("keypress", ev => {
// Maximize the standalone video when pressing F11,
// but ignore audio elements
if (
ev.key == "F11" &&
videoElement.videoWidth != 0 &&
videoElement.videoHeight != 0
) {
// If we're in browser fullscreen mode, it means the user pressed F11
// while browser chrome or another tab had focus.
// Don't break leaving that mode, so do nothing here.
if (window.fullScreen) {
return;
}
// If we're not in browser fullscreen mode, prevent entering into that,
// so we don't end up there after pressing Esc.
ev.preventDefault();
ev.stopPropagation();
if (!document.fullscreenElement) {
videoElement.requestFullscreen();
} else {
document.exitFullscreen();
}
}
});
}