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gecko-dev/toolkit/actors/PictureInPictureChild.jsm

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44 KiB
JavaScript
Исходник Ответственный История

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
var EXPORTED_SYMBOLS = ["PictureInPictureChild", "PictureInPictureToggleChild"];
ChromeUtils.defineModuleGetter(
this,
"DeferredTask",
"resource://gre/modules/DeferredTask.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"Services",
"resource://gre/modules/Services.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"TOGGLE_POLICIES",
"resource://gre/modules/PictureInPictureTogglePolicy.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"TOGGLE_POLICY_STRINGS",
"resource://gre/modules/PictureInPictureTogglePolicy.jsm"
);
const { XPCOMUtils } = ChromeUtils.import(
"resource://gre/modules/XPCOMUtils.jsm"
);
const TOGGLE_ENABLED_PREF =
"media.videocontrols.picture-in-picture.video-toggle.enabled";
const TOGGLE_TESTING_PREF =
"media.videocontrols.picture-in-picture.video-toggle.testing";
const MOUSEMOVE_PROCESSING_DELAY_MS = 50;
const TOGGLE_HIDING_TIMEOUT_MS = 2000;
// A weak reference to the most recent <video> in this content
// process that is being viewed in Picture-in-Picture.
var gWeakVideo = null;
// A weak reference to the content window of the most recent
// Picture-in-Picture window for this content process.
var gWeakPlayerContent = null;
// To make it easier to write tests, we have a process-global
// WeakSet of all <video> elements that are being tracked for
// mouseover
var gWeakIntersectingVideosForTesting = new WeakSet();
// Overrides are expected to stay constant for the lifetime of a
// content process, so we set this as a lazy process global.
// See PictureInPictureToggleChild.getToggleOverrides for a sense
// of what the return type is.
XPCOMUtils.defineLazyGetter(this, "gToggleOverrides", () => {
return PictureInPictureToggleChild.getToggleOverrides();
});
/**
* The PictureInPictureToggleChild is responsible for displaying the overlaid
* Picture-in-Picture toggle over top of <video> elements that the mouse is
* hovering.
*/
class PictureInPictureToggleChild extends JSWindowActorChild {
constructor() {
super();
// We need to maintain some state about various things related to the
// Picture-in-Picture toggles - however, for now, the same
// PictureInPictureToggleChild might be re-used for different documents.
// We keep the state stashed inside of this WeakMap, keyed on the document
// itself.
this.weakDocStates = new WeakMap();
this.toggleEnabled = Services.prefs.getBoolPref(TOGGLE_ENABLED_PREF);
this.toggleTesting = Services.prefs.getBoolPref(TOGGLE_TESTING_PREF, false);
// Bug 1570744 - JSWindowActorChild's cannot be used as nsIObserver's
// directly, so we create a new function here instead to act as our
// nsIObserver, which forwards the notification to the observe method.
this.observerFunction = (subject, topic, data) => {
this.observe(subject, topic, data);
};
Services.prefs.addObserver(TOGGLE_ENABLED_PREF, this.observerFunction);
}
willDestroy() {
this.stopTrackingMouseOverVideos();
Services.prefs.removeObserver(TOGGLE_ENABLED_PREF, this.observerFunction);
}
observe(subject, topic, data) {
if (topic == "nsPref:changed" && data == TOGGLE_ENABLED_PREF) {
this.toggleEnabled = Services.prefs.getBoolPref(TOGGLE_ENABLED_PREF);
if (this.toggleEnabled) {
// We have enabled the Picture-in-Picture toggle, so we need to make
// sure we register all of the videos that might already be on the page.
this.contentWindow.requestIdleCallback(() => {
let videos = this.document.querySelectorAll("video");
for (let video of videos) {
this.registerVideo(video);
}
});
}
}
}
/**
* Returns the state for the current document referred to via
* this.document. If no such state exists, creates it, stores it
* and returns it.
*/
get docState() {
let state = this.weakDocStates.get(this.document);
if (!state) {
state = {
// A reference to the IntersectionObserver that's monitoring for videos
// to become visible.
intersectionObserver: null,
// A WeakSet of videos that are supposedly visible, according to the
// IntersectionObserver.
weakVisibleVideos: new WeakSet(),
// The number of videos that are supposedly visible, according to the
// IntersectionObserver
visibleVideosCount: 0,
// The DeferredTask that we'll arm every time a mousemove event occurs
// on a page where we have one or more visible videos.
mousemoveDeferredTask: null,
// A weak reference to the last video we displayed the toggle over.
weakOverVideo: null,
// True if the user is in the midst of clicking the toggle.
isClickingToggle: false,
// Set to the original target element on pointerdown if the user is clicking
// the toggle - this way, we can determine if a "click" event will need to be
// suppressed ("click" events don't fire if a "mouseup" occurs on a different
// element from the "pointerdown" / "mousedown" event).
clickedElement: null,
// This is a DeferredTask to hide the toggle after a period of mouse
// inactivity.
hideToggleDeferredTask: null,
// If we reach a point where we're tracking videos for mouse movements,
// then this will be true. If there are no videos worth tracking, then
// this is false.
isTrackingVideos: false,
togglePolicy: TOGGLE_POLICIES.DEFAULT,
hasCheckedPolicy: false,
};
this.weakDocStates.set(this.document, state);
}
return state;
}
/**
* Returns the video that the user was last hovering with the mouse if it
* still exists.
*
* @return {Element} the <video> element that the user was last hovering,
* or null if there was no such <video>, or the <video> no longer exists.
*/
getWeakOverVideo() {
let { weakOverVideo } = this.docState;
if (weakOverVideo) {
// Bug 800957 - Accessing weakrefs at the wrong time can cause us to
// throw NS_ERROR_XPC_BAD_CONVERT_NATIVE
try {
return weakOverVideo.get();
} catch (e) {
return null;
}
}
return null;
}
handleEvent(event) {
if (!event.isTrusted) {
// We don't care about synthesized events that might be coming from
// content JS.
return;
}
switch (event.type) {
case "UAWidgetSetupOrChange": {
if (
this.toggleEnabled &&
event.target instanceof this.contentWindow.HTMLVideoElement &&
event.target.ownerDocument == this.document
) {
this.registerVideo(event.target);
}
break;
}
case "contextmenu": {
if (this.toggleEnabled) {
this.checkContextMenu(event);
}
break;
}
case "mouseout": {
this.onMouseOut(event);
break;
}
case "mousedown":
case "pointerup":
case "mouseup":
case "click": {
this.onMouseButtonEvent(event);
break;
}
case "pointerdown": {
this.onPointerDown(event);
break;
}
case "mousemove": {
this.onMouseMove(event);
break;
}
case "pageshow": {
this.onPageShow(event);
break;
}
case "pagehide": {
this.onPageHide(event);
break;
}
}
}
/**
* Adds a <video> to the IntersectionObserver so that we know when it becomes
* visible.
*
* @param {Element} video The <video> element to register.
*/
registerVideo(video) {
let state = this.docState;
if (!state.intersectionObserver) {
let fn = this.onIntersection.bind(this);
state.intersectionObserver = new this.contentWindow.IntersectionObserver(
fn,
{
threshold: [0.0, 0.5],
}
);
}
state.intersectionObserver.observe(video);
}
/**
* Called by the IntersectionObserver callback once a video becomes visible.
* This adds some fine-grained checking to ensure that a sufficient amount of
* the video is visible before we consider showing the toggles on it. For now,
* that means that the entirety of the video must be in the viewport.
*
* @param {IntersectionEntry} intersectionEntry An IntersectionEntry passed to
* the IntersectionObserver callback.
* @return bool Whether or not we should start tracking mousemove events for
* this registered video.
*/
worthTracking(intersectionEntry) {
return intersectionEntry.isIntersecting;
}
/**
* Called by the IntersectionObserver once a video crosses one of the
* thresholds dictated by the IntersectionObserver configuration.
*
* @param {Array<IntersectionEntry>} A collection of one or more
* IntersectionEntry's for <video> elements that might have entered or exited
* the viewport.
*/
onIntersection(entries) {
// The IntersectionObserver will also fire when a previously intersecting
// element is removed from the DOM. We know, however, that the node is
// still alive and referrable from the WeakSet because the
// IntersectionObserverEntry holds a strong reference to the video.
let state = this.docState;
let oldVisibleVideosCount = state.visibleVideosCount;
for (let entry of entries) {
let video = entry.target;
if (this.worthTracking(entry)) {
if (!state.weakVisibleVideos.has(video)) {
state.weakVisibleVideos.add(video);
state.visibleVideosCount++;
if (this.toggleTesting) {
gWeakIntersectingVideosForTesting.add(video);
}
}
} else if (state.weakVisibleVideos.has(video)) {
state.weakVisibleVideos.delete(video);
state.visibleVideosCount--;
if (this.toggleTesting) {
gWeakIntersectingVideosForTesting.delete(video);
}
}
}
// For testing, especially in debug or asan builds, we might not
// run this idle callback within an acceptable time. While we're
// testing, we'll bypass the idle callback performance optimization
// and run our callbacks as soon as possible during the next idle
// period.
if (!oldVisibleVideosCount && state.visibleVideosCount) {
if (this.toggleTesting) {
this.beginTrackingMouseOverVideos();
} else {
this.contentWindow.requestIdleCallback(() => {
this.beginTrackingMouseOverVideos();
});
}
} else if (oldVisibleVideosCount && !state.visibleVideosCount) {
if (this.toggleTesting) {
this.stopTrackingMouseOverVideos();
} else {
this.contentWindow.requestIdleCallback(() => {
this.stopTrackingMouseOverVideos();
});
}
}
}
addMouseButtonListeners() {
// We want to try to cancel the mouse events from continuing
// on into content if the user has clicked on the toggle, so
// we don't use the mozSystemGroup here, and add the listener
// to the parent target of the window, which in this case,
// is the windowRoot. Since this event listener is attached to
// part of the outer window, we need to also remove it in a
// pagehide event listener in the event that the page unloads
// before stopTrackingMouseOverVideos fires.
this.contentWindow.windowRoot.addEventListener("pointerdown", this, {
capture: true,
});
this.contentWindow.windowRoot.addEventListener("mousedown", this, {
capture: true,
});
this.contentWindow.windowRoot.addEventListener("mouseup", this, {
capture: true,
});
this.contentWindow.windowRoot.addEventListener("pointerup", this, {
capture: true,
});
this.contentWindow.windowRoot.addEventListener("click", this, {
capture: true,
});
this.contentWindow.windowRoot.addEventListener("mouseout", this, {
capture: true,
});
}
removeMouseButtonListeners() {
this.contentWindow.windowRoot.removeEventListener("pointerdown", this, {
capture: true,
});
this.contentWindow.windowRoot.removeEventListener("mousedown", this, {
capture: true,
});
this.contentWindow.windowRoot.removeEventListener("mouseup", this, {
capture: true,
});
this.contentWindow.windowRoot.removeEventListener("pointerup", this, {
capture: true,
});
this.contentWindow.windowRoot.removeEventListener("click", this, {
capture: true,
});
this.contentWindow.windowRoot.removeEventListener("mouseout", this, {
capture: true,
});
}
/**
* One of the challenges of displaying this toggle is that many sites put
* things over top of <video> elements, like custom controls, or images, or
* all manner of things that might intercept mouseevents that would normally
* fire directly on the <video>. In order to properly detect when the mouse
* is over top of one of the <video> elements in this situation, we currently
* add a mousemove event handler to the entire document, and stash the most
* recent mousemove that fires. At periodic intervals, that stashed mousemove
* event is checked to see if it's hovering over one of our registered
* <video> elements.
*
* This sort of thing will not be necessary once bug 1539652 is fixed.
*/
beginTrackingMouseOverVideos() {
let state = this.docState;
if (!state.mousemoveDeferredTask) {
state.mousemoveDeferredTask = new DeferredTask(() => {
this.checkLastMouseMove();
}, MOUSEMOVE_PROCESSING_DELAY_MS);
}
this.document.addEventListener("mousemove", this, {
mozSystemGroup: true,
capture: true,
});
this.contentWindow.addEventListener("pageshow", this, {
mozSystemGroup: true,
});
this.contentWindow.addEventListener("pagehide", this, {
mozSystemGroup: true,
});
this.addMouseButtonListeners();
state.isTrackingVideos = true;
}
/**
* If we no longer have any interesting videos in the viewport, we deregister
* the mousemove and click listeners, and also remove any toggles that might
* be on the page still.
*/
stopTrackingMouseOverVideos() {
let state = this.docState;
// We initialize `mousemoveDeferredTask` in `beginTrackingMouseOverVideos`.
// If it doesn't exist, that can't have happened. Nothing else ever sets
// this value (though we arm/disarm in various places). So we don't need
// to do anything else here and can return early.
if (!state.mousemoveDeferredTask) {
return;
}
state.mousemoveDeferredTask.disarm();
this.document.removeEventListener("mousemove", this, {
mozSystemGroup: true,
capture: true,
});
this.contentWindow.removeEventListener("pageshow", this, {
mozSystemGroup: true,
});
this.contentWindow.removeEventListener("pagehide", this, {
mozSystemGroup: true,
});
this.removeMouseButtonListeners();
let oldOverVideo = this.getWeakOverVideo();
if (oldOverVideo) {
this.onMouseLeaveVideo(oldOverVideo);
}
state.isTrackingVideos = false;
}
/**
* This pageshow event handler will get called if and when we complete a tab
* tear out or in. If we happened to be tracking videos before the tear
* occurred, we re-add the mouse event listeners so that they're attached to
* the right WindowRoot.
*
* @param {Event} event The pageshow event fired when completing a tab tear
* out or in.
*/
onPageShow(event) {
let state = this.docState;
if (state.isTrackingVideos) {
this.addMouseButtonListeners();
}
}
/**
* This pagehide event handler will get called if and when we start a tab
* tear out or in. If we happened to be tracking videos before the tear
* occurred, we remove the mouse event listeners. We'll re-add them when the
* pageshow event fires.
*
* @param {Event} event The pagehide event fired when starting a tab tear
* out or in.
*/
onPageHide(event) {
let state = this.docState;
if (state.isTrackingVideos) {
this.removeMouseButtonListeners();
}
}
/**
* If we're tracking <video> elements, this pointerdown event handler is run anytime
* a pointerdown occurs on the document. This function is responsible for checking
* if the user clicked on the Picture-in-Picture toggle. It does this by first
* checking if the video is visible beneath the point that was clicked. Then
* it tests whether or not the pointerdown occurred within the rectangle of the
* toggle. If so, the event's propagation is stopped, and Picture-in-Picture is
* triggered.
*
* @param {Event} event The mousemove event.
*/
onPointerDown(event) {
// The toggle ignores non-primary mouse clicks.
if (event.button != 0) {
return;
}
let video = this.getWeakOverVideo();
if (!video) {
return;
}
let shadowRoot = video.openOrClosedShadowRoot;
if (!shadowRoot) {
return;
}
let { clientX, clientY } = event;
let winUtils = this.contentWindow.windowUtils;
// We use winUtils.nodesFromRect instead of document.elementsFromPoint,
// since document.elementsFromPoint always flushes layout. The 1's in that
// function call are for the size of the rect that we want, which is 1x1.
//
// We pass the aOnlyVisible boolean argument to check that the video isn't
// occluded by anything visible at the point of mousedown. If it is, we'll
// ignore the mousedown.
let elements = winUtils.nodesFromRect(
clientX,
clientY,
1,
1,
1,
1,
true,
false,
true /* aOnlyVisible */
);
if (!Array.from(elements).includes(video)) {
return;
}
let toggle = shadowRoot.getElementById("pictureInPictureToggleButton");
if (this.isMouseOverToggle(toggle, event)) {
let state = this.docState;
state.isClickingToggle = true;
state.clickedElement = Cu.getWeakReference(event.originalTarget);
event.stopImmediatePropagation();
Services.telemetry.keyedScalarAdd(
"pictureinpicture.opened_method",
"toggle",
1
);
let pipEvent = new this.contentWindow.CustomEvent(
"MozTogglePictureInPicture",
{
bubbles: true,
}
);
video.dispatchEvent(pipEvent);
// Since we've initiated Picture-in-Picture, we can go ahead and
// hide the toggle now.
this.onMouseLeaveVideo(video);
}
}
/**
* Called for mousedown, pointerup, mouseup and click events. If we
* detected that the user is clicking on the Picture-in-Picture toggle,
* these events are cancelled in the capture-phase before they reach
* content. The state for suppressing these events is cleared on the
* click event (unless the mouseup occurs on a different element from
* the mousedown, in which case, the state is cleared on mouseup).
*
* @param {Event} event A mousedown, pointerup, mouseup or click event.
*/
onMouseButtonEvent(event) {
// The toggle ignores non-primary mouse clicks.
if (event.button != 0) {
return;
}
let state = this.docState;
if (state.isClickingToggle) {
event.stopImmediatePropagation();
// If this is a mouseup event, check to see if we have a record of what
// the original target was on pointerdown. If so, and if it doesn't match
// the mouseup original target, that means we won't get a click event, and
// we can clear the "clicking the toggle" state right away.
//
// Otherwise, we wait for the click event to do that.
let isMouseUpOnOtherElement =
event.type == "mouseup" &&
(!state.clickedElement ||
state.clickedElement.get() != event.originalTarget);
if (isMouseUpOnOtherElement || event.type == "click") {
// The click is complete, so now we reset the state so that
// we stop suppressing these events.
state.isClickingToggle = false;
state.clickedElement = null;
}
}
}
/**
* Called on mouseout events to determine whether or not the mouse has
* exited the window.
*
* @param {Event} event The mouseout event.
*/
onMouseOut(event) {
if (!event.relatedTarget) {
// For mouseout events, if there's no relatedTarget (which normally
// maps to the element that the mouse entered into) then this means that
// we left the window.
let video = this.getWeakOverVideo();
if (!video) {
return;
}
this.onMouseLeaveVideo(video);
}
}
/**
* Called for each mousemove event when we're tracking those events to
* determine if the cursor is hovering over a <video>.
*
* @param {Event} event The mousemove event.
*/
onMouseMove(event) {
let state = this.docState;
if (state.hideToggleDeferredTask) {
state.hideToggleDeferredTask.disarm();
state.hideToggleDeferredTask.arm();
}
state.lastMouseMoveEvent = event;
state.mousemoveDeferredTask.arm();
}
/**
* Called by the DeferredTask after MOUSEMOVE_PROCESSING_DELAY_MS
* milliseconds. Checked to see if that mousemove happens to be overtop of
* any interesting <video> elements that we want to display the toggle
* on. If so, puts the toggle on that video.
*/
checkLastMouseMove() {
let state = this.docState;
let event = state.lastMouseMoveEvent;
let { clientX, clientY } = event;
let winUtils = this.contentWindow.windowUtils;
// We use winUtils.nodesFromRect instead of document.elementsFromPoint,
// since document.elementsFromPoint always flushes layout. The 1's in that
// function call are for the size of the rect that we want, which is 1x1.
let elements = winUtils.nodesFromRect(
clientX,
clientY,
1,
1,
1,
1,
true,
false,
true
);
for (let element of elements) {
if (
state.weakVisibleVideos.has(element) &&
!element.isCloningElementVisually
) {
this.onMouseOverVideo(element, event);
return;
}
}
let oldOverVideo = this.getWeakOverVideo();
if (oldOverVideo) {
this.onMouseLeaveVideo(oldOverVideo);
}
}
/**
* Called once it has been determined that the mouse is overtop of a video
* that is in the viewport.
*
* @param {Element} video The video the mouse is over.
*/
onMouseOverVideo(video, event) {
let oldOverVideo = this.getWeakOverVideo();
let shadowRoot = video.openOrClosedShadowRoot;
// It seems from automated testing that if it's still very early on in the
// lifecycle of a <video> element, it might not yet have a shadowRoot,
// in which case, we can bail out here early.
if (!shadowRoot) {
if (oldOverVideo) {
// We also clear the hover state on the old video we were hovering,
// if there was one.
this.onMouseLeaveVideo(oldOverVideo);
}
return;
}
let state = this.docState;
let toggle = shadowRoot.getElementById("pictureInPictureToggleButton");
let controlsOverlay = shadowRoot.querySelector(".controlsOverlay");
if (!state.hasCheckedPolicy) {
// We cache the matchers process-wide. We'll skip this while running tests to make that
// easier.
let toggleOverrides = this.toggleTesting
? PictureInPictureToggleChild.getToggleOverrides()
: gToggleOverrides;
// Do we have any toggle overrides? If so, try to apply them.
for (let [override, policy] of toggleOverrides) {
if (override.matches(this.document.documentURI)) {
state.togglePolicy = policy;
break;
}
}
state.hasCheckedPolicy = true;
}
// The built-in <video> controls are along the bottom, which would overlap the
// toggle if the override is set to BOTTOM, so we ignore overrides that set
// a policy of BOTTOM for <video> elements with controls.
if (
state.togglePolicy != TOGGLE_POLICIES.DEFAULT &&
!(state.togglePolicy == TOGGLE_POLICIES.BOTTOM && video.controls)
) {
toggle.setAttribute("policy", TOGGLE_POLICY_STRINGS[state.togglePolicy]);
}
controlsOverlay.removeAttribute("hidetoggle");
// The hideToggleDeferredTask we create here is for automatically hiding
// the toggle after a period of no mousemove activity for
// TOGGLE_HIDING_TIMEOUT_MS. If the mouse moves, then the DeferredTask
// timer is reset.
//
// We disable the toggle hiding timeout during testing to reduce
// non-determinism from timers when testing the toggle.
if (!state.hideToggleDeferredTask && !this.toggleTesting) {
state.hideToggleDeferredTask = new DeferredTask(() => {
controlsOverlay.setAttribute("hidetoggle", true);
}, TOGGLE_HIDING_TIMEOUT_MS);
}
if (oldOverVideo) {
if (oldOverVideo == video) {
// If we're still hovering the old video, we might have entered or
// exited the toggle region.
this.checkHoverToggle(toggle, event);
return;
}
// We had an old video that we were hovering, and we're not hovering
// it anymore. Let's leave it.
this.onMouseLeaveVideo(oldOverVideo);
}
state.weakOverVideo = Cu.getWeakReference(video);
controlsOverlay.classList.add("hovering");
// Now that we're hovering the video, we'll check to see if we're
// hovering the toggle too.
this.checkHoverToggle(toggle, event);
}
/**
* Checks if a mouse event is happening over a toggle element. If it is,
* sets the hovering class on it. Otherwise, it clears the hovering
* class.
*
* @param {Element} toggle The Picture-in-Picture toggle to check.
* @param {MouseEvent} event A MouseEvent to test.
*/
checkHoverToggle(toggle, event) {
toggle.classList.toggle("hovering", this.isMouseOverToggle(toggle, event));
}
/**
* Called once it has been determined that the mouse is no longer overlapping
* a video that we'd previously called onMouseOverVideo with.
*
* @param {Element} video The video that the mouse left.
*/
onMouseLeaveVideo(video) {
let state = this.docState;
let shadowRoot = video.openOrClosedShadowRoot;
if (shadowRoot) {
let controlsOverlay = shadowRoot.querySelector(".controlsOverlay");
let toggle = shadowRoot.getElementById("pictureInPictureToggleButton");
controlsOverlay.classList.remove("hovering");
toggle.classList.remove("hovering");
}
state.weakOverVideo = null;
if (!this.toggleTesting) {
state.hideToggleDeferredTask.disarm();
state.mousemoveDeferredTask.disarm();
}
state.hideToggleDeferredTask = null;
}
/**
* Given a reference to a Picture-in-Picture toggle element, determines
* if a MouseEvent event is occurring within its bounds.
*
* @param {Element} toggle The Picture-in-Picture toggle.
* @param {MouseEvent} event A MouseEvent to test.
*
* @return {Boolean}
*/
isMouseOverToggle(toggle, event) {
let toggleRect = toggle.ownerGlobal.windowUtils.getBoundsWithoutFlushing(
toggle
);
// If the toggle has no dimensions, we're definitely not over it.
if (!toggleRect.width || !toggleRect.height) {
return false;
}
let { clientX, clientY } = event;
return (
clientX >= toggleRect.left &&
clientX <= toggleRect.right &&
clientY >= toggleRect.top &&
clientY <= toggleRect.bottom
);
}
/**
* Checks a contextmenu event to see if the mouse is currently over the
* Picture-in-Picture toggle. If so, sends a message to the parent process
* to open up the Picture-in-Picture toggle context menu.
*
* @param {MouseEvent} event A contextmenu event.
*/
checkContextMenu(event) {
let video = this.getWeakOverVideo();
if (!video) {
return;
}
let shadowRoot = video.openOrClosedShadowRoot;
if (!shadowRoot) {
return;
}
let toggle = shadowRoot.getElementById("pictureInPictureToggleButton");
if (this.isMouseOverToggle(toggle, event)) {
event.stopImmediatePropagation();
event.preventDefault();
this.sendAsyncMessage("PictureInPicture:OpenToggleContextMenu", {
screenX: event.screenX,
screenY: event.screenY,
mozInputSource: event.mozInputSource,
});
}
}
/**
* This is a test-only function that returns true if a video is being tracked
* for mouseover events after having intersected the viewport.
*/
static isTracking(video) {
return gWeakIntersectingVideosForTesting.has(video);
}
/**
* Gets any Picture-in-Picture toggle overrides stored in the sharedData
* struct, and returns them as an Array of two-element Arrays, where the first
* element is a MatchPattern and the second element is a policy.
*
* @returns {Array<Array<2>>} Array of 2-element Arrays where the first element
* is a MatchPattern and the second element is a Number representing a toggle
* policy.
*/
static getToggleOverrides() {
let result = [];
let patterns = Services.cpmm.sharedData.get(
"PictureInPicture:ToggleOverrides"
);
for (let pattern in patterns) {
let matcher = new MatchPattern(pattern);
result.push([matcher, patterns[pattern]]);
}
return result;
}
}
class PictureInPictureChild extends JSWindowActorChild {
static videoIsPlaying(video) {
return !!(
video.currentTime > 0 &&
!video.paused &&
!video.ended &&
video.readyState > 2
);
}
static videoIsMuted(video) {
return video.muted;
}
handleEvent(event) {
switch (event.type) {
case "MozTogglePictureInPicture": {
if (event.isTrusted) {
this.togglePictureInPicture(event.target);
}
break;
}
case "MozStopPictureInPicture": {
if (event.isTrusted && event.target === this.getWeakVideo()) {
this.closePictureInPicture({ reason: "video-el-remove" });
}
break;
}
case "pagehide": {
// The originating video's content document has unloaded,
// so close Picture-in-Picture.
this.closePictureInPicture({ reason: "pagehide" });
break;
}
case "play": {
this.sendAsyncMessage("PictureInPicture:Playing");
break;
}
case "pause": {
this.sendAsyncMessage("PictureInPicture:Paused");
break;
}
case "volumechange": {
let video = this.getWeakVideo();
// Just double-checking that we received the event for the right
// video element.
if (video !== event.target) {
Cu.reportError(
"PictureInPictureChild received volumechange for " +
"the wrong video!"
);
return;
}
if (video.muted) {
this.sendAsyncMessage("PictureInPicture:Muting");
} else {
this.sendAsyncMessage("PictureInPicture:Unmuting");
}
break;
}
case "resize": {
let video = event.target;
if (this.inPictureInPicture(video)) {
this.sendAsyncMessage("PictureInPicture:Resize", {
videoHeight: video.videoHeight,
videoWidth: video.videoWidth,
});
}
break;
}
}
}
/**
* Returns a reference to the <video> element being displayed in Picture-in-Picture
* mode.
*
* @return {Element} The <video> being displayed in Picture-in-Picture mode, or null
* if that <video> no longer exists.
*/
getWeakVideo() {
if (gWeakVideo) {
// Bug 800957 - Accessing weakrefs at the wrong time can cause us to
// throw NS_ERROR_XPC_BAD_CONVERT_NATIVE
try {
return gWeakVideo.get();
} catch (e) {
return null;
}
}
return null;
}
/**
* Returns a reference to the inner window of the about:blank document that is
* cloning the originating <video> in the always-on-top player <xul:browser>.
*
* @return {Window} The inner window of the about:blank player <xul:browser>, or
* null if that window has been closed.
*/
getWeakPlayerContent() {
if (gWeakPlayerContent) {
// Bug 800957 - Accessing weakrefs at the wrong time can cause us to
// throw NS_ERROR_XPC_BAD_CONVERT_NATIVE
try {
return gWeakPlayerContent.get();
} catch (e) {
return null;
}
}
return null;
}
/**
* Tells the parent to open a Picture-in-Picture window hosting
* a clone of the passed video. If we know about a pre-existing
* Picture-in-Picture window existing, this tells the parent to
* close it before opening the new one.
*
* @param {Element} video The <video> element to view in a Picture
* in Picture window.
*
* @return {Promise}
* @resolves {undefined} Once the new Picture-in-Picture window
* has been requested.
*/
async togglePictureInPicture(video) {
// We don't allow viewing <video> elements with MediaStreams
// in Picture-in-Picture for now due to bug 1592539.
if (video.srcObject) {
return;
}
if (this.inPictureInPicture(video)) {
// The only way we could have entered here for the same video is if
// we are toggling via the context menu, since we hide the inline
// Picture-in-Picture toggle when a video is being displayed in
// Picture-in-Picture.
await this.closePictureInPicture({ reason: "contextmenu" });
} else {
if (this.getWeakVideo()) {
// There's a pre-existing Picture-in-Picture window for a video
// in this content process. Send a message to the parent to close
// the Picture-in-Picture window.
await this.closePictureInPicture({ reason: "new-pip" });
}
gWeakVideo = Cu.getWeakReference(video);
this.sendAsyncMessage("PictureInPicture:Request", {
isMuted: PictureInPictureChild.videoIsMuted(video),
playing: PictureInPictureChild.videoIsPlaying(video),
videoHeight: video.videoHeight,
videoWidth: video.videoWidth,
});
}
}
/**
* Returns true if the passed video happens to be the one that this
* content process is running in a Picture-in-Picture window.
*
* @param {Element} video The <video> element to check.
*
* @return {Boolean}
*/
inPictureInPicture(video) {
return this.getWeakVideo() === video;
}
/**
* Tells the parent to close a pre-existing Picture-in-Picture
* window.
*
* @return {Promise}
*
* @resolves {undefined} Once the pre-existing Picture-in-Picture
* window has unloaded.
*/
async closePictureInPicture({ reason }) {
let video = this.getWeakVideo();
if (video) {
this.untrackOriginatingVideo(video);
}
this.sendAsyncMessage("PictureInPicture:Close", {
reason,
});
let playerContent = this.getWeakPlayerContent();
if (playerContent) {
if (!playerContent.closed) {
await new Promise(resolve => {
playerContent.addEventListener("unload", resolve, {
once: true,
});
});
}
// Nothing should be holding a reference to the Picture-in-Picture
// player window content at this point, but just in case, we'll
// clear the weak reference directly so nothing else can get a hold
// of it from this angle.
gWeakPlayerContent = null;
}
}
receiveMessage(message) {
switch (message.name) {
case "PictureInPicture:SetupPlayer": {
this.setupPlayer();
break;
}
case "PictureInPicture:Play": {
this.play();
break;
}
case "PictureInPicture:Pause": {
this.pause();
break;
}
case "PictureInPicture:Mute": {
this.mute();
break;
}
case "PictureInPicture:Unmute": {
this.unmute();
break;
}
case "PictureInPicture:KeyDown": {
this.keyDown(message.data);
break;
}
case "PictureInPicture:KeyToggle": {
this.keyToggle();
break;
}
}
}
/**
* Keeps an eye on the originating video's document. If it ever
* goes away, this will cause the Picture-in-Picture window for any
* of its content to go away as well.
*/
trackOriginatingVideo(originatingVideo) {
let originatingWindow = originatingVideo.ownerGlobal;
if (originatingWindow) {
originatingWindow.addEventListener("pagehide", this);
originatingVideo.addEventListener("play", this);
originatingVideo.addEventListener("pause", this);
originatingVideo.addEventListener("volumechange", this);
originatingVideo.addEventListener("resize", this);
}
}
/**
* Stops tracking the originating video's document. This should
* happen once the Picture-in-Picture window goes away (or is about
* to go away), and we no longer care about hearing when the originating
* window's document unloads.
*/
untrackOriginatingVideo(originatingVideo) {
let originatingWindow = originatingVideo.ownerGlobal;
if (originatingWindow) {
originatingWindow.removeEventListener("pagehide", this);
originatingVideo.removeEventListener("play", this);
originatingVideo.removeEventListener("pause", this);
originatingVideo.removeEventListener("volumechange", this);
originatingVideo.removeEventListener("resize", this);
}
}
/**
* Runs in an instance of PictureInPictureChild for the
* player window's content, and not the originating video
* content. Sets up the player so that it clones the originating
* video. If anything goes wrong during set up, a message is
* sent to the parent to close the Picture-in-Picture window.
*
* @return {Promise}
* @resolves {undefined} Once the player window has been set up
* properly, or a pre-existing Picture-in-Picture window has gone
* away due to an unexpected error.
*/
async setupPlayer() {
let originatingVideo = this.getWeakVideo();
if (!originatingVideo) {
// If the video element has gone away before we've had a chance to set up
// Picture-in-Picture for it, tell the parent to close the Picture-in-Picture
// window.
await this.closePictureInPicture({ reason: "setup-failure" });
return;
}
this.contentWindow.location.reload();
let webProgress = this.docShell
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebProgress);
if (webProgress.isLoadingDocument) {
await new Promise(resolve => {
this.contentWindow.addEventListener("load", resolve, {
once: true,
mozSystemGroup: true,
capture: true,
});
});
}
let doc = this.document;
let playerVideo = doc.createElement("video");
doc.body.style.overflow = "hidden";
doc.body.style.margin = "0";
// Force the player video to assume maximum height and width of the
// containing window
playerVideo.style.height = "100vh";
playerVideo.style.width = "100vw";
playerVideo.style.backgroundColor = "#000";
doc.body.appendChild(playerVideo);
originatingVideo.cloneElementVisually(playerVideo);
this.trackOriginatingVideo(originatingVideo);
this.contentWindow.addEventListener(
"unload",
() => {
let video = this.getWeakVideo();
if (video) {
this.untrackOriginatingVideo(video);
video.stopCloningElementVisually();
}
gWeakVideo = null;
},
{ once: true }
);
gWeakPlayerContent = Cu.getWeakReference(this.contentWindow);
}
play() {
let video = this.getWeakVideo();
if (video) {
video.play();
}
}
pause() {
let video = this.getWeakVideo();
if (video) {
video.pause();
}
}
mute() {
let video = this.getWeakVideo();
if (video) {
video.muted = true;
}
}
unmute() {
let video = this.getWeakVideo();
if (video) {
video.muted = false;
}
}
/**
* This reuses the keyHandler logic in the VideoControlsWidget
* https://searchfox.org/mozilla-central/rev/cfd1cc461f1efe0d66c2fdc17c024a203d5a2fd8/toolkit/content/widgets/videocontrols.js#1687-1810.
* There are future plans to eventually combine the two implementations.
*/
keyDown({ altKey, shiftKey, metaKey, ctrlKey, keyCode }) {
let video = this.getWeakVideo();
if (!video) {
return;
}
var keystroke = "";
if (altKey) {
keystroke += "alt-";
}
if (shiftKey) {
keystroke += "shift-";
}
if (this.contentWindow.navigator.platform.startsWith("Mac")) {
if (metaKey) {
keystroke += "accel-";
}
if (ctrlKey) {
keystroke += "control-";
}
} else {
if (metaKey) {
keystroke += "meta-";
}
if (ctrlKey) {
keystroke += "accel-";
}
}
switch (keyCode) {
case this.contentWindow.KeyEvent.DOM_VK_UP:
keystroke += "upArrow";
break;
case this.contentWindow.KeyEvent.DOM_VK_DOWN:
keystroke += "downArrow";
break;
case this.contentWindow.KeyEvent.DOM_VK_LEFT:
keystroke += "leftArrow";
break;
case this.contentWindow.KeyEvent.DOM_VK_RIGHT:
keystroke += "rightArrow";
break;
case this.contentWindow.KeyEvent.DOM_VK_HOME:
keystroke += "home";
break;
case this.contentWindow.KeyEvent.DOM_VK_END:
keystroke += "end";
break;
case this.contentWindow.KeyEvent.DOM_VK_SPACE:
keystroke += "space";
break;
}
const isVideoStreaming = video.duration == +Infinity;
var oldval, newval;
try {
switch (keystroke) {
case "space" /* Toggle Play / Pause */:
if (video.paused || video.ended) {
video.play();
} else {
video.pause();
}
break;
case "downArrow" /* Volume decrease */:
oldval = video.volume;
video.volume = oldval < 0.1 ? 0 : oldval - 0.1;
video.muted = false;
break;
case "upArrow" /* Volume increase */:
oldval = video.volume;
video.volume = oldval > 0.9 ? 1 : oldval + 0.1;
video.muted = false;
break;
case "accel-downArrow" /* Mute */:
video.muted = true;
break;
case "accel-upArrow" /* Unmute */:
video.muted = false;
break;
case "leftArrow": /* Seek back 15 seconds */
case "accel-leftArrow" /* Seek back 10% */:
if (isVideoStreaming) {
return;
}
oldval = video.currentTime;
if (keystroke == "leftArrow") {
newval = oldval - 15;
} else {
newval = oldval - video.duration / 10;
}
video.currentTime = newval >= 0 ? newval : 0;
break;
case "rightArrow": /* Seek forward 15 seconds */
case "accel-rightArrow" /* Seek forward 10% */:
if (isVideoStreaming) {
return;
}
oldval = video.currentTime;
var maxtime = video.duration;
if (keystroke == "rightArrow") {
newval = oldval + 15;
} else {
newval = oldval + maxtime / 10;
}
video.currentTime = newval <= maxtime ? newval : maxtime;
break;
case "home" /* Seek to beginning */:
if (!isVideoStreaming) {
video.currentTime = 0;
}
break;
case "end" /* Seek to end */:
if (!isVideoStreaming && video.currentTime != video.duration) {
video.currentTime = video.duration;
}
break;
default:
}
} catch (e) {
/* ignore any exception from setting video.currentTime */
}
}
/**
* The keyboard was used to attempt to open Picture-in-Picture. In this case,
* find the focused window, and open Picture-in-Picture for the first
* available video. We suspect this heuristic will handle most cases, though
* we might refine this later on.
*/
keyToggle() {
let focusedWindow = Services.focus.focusedWindow;
if (focusedWindow) {
let doc = focusedWindow.document;
if (doc) {
let listOfVideos = doc.querySelectorAll("video");
let video =
Array.from(listOfVideos).filter(v => !v.paused)[0] || listOfVideos[0];
if (video) {
this.togglePictureInPicture(video);
}
}
}
}
}
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