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-rw-r--r--browser/actors/DOMFullscreenChild.sys.mjs164
1 files changed, 164 insertions, 0 deletions
diff --git a/browser/actors/DOMFullscreenChild.sys.mjs b/browser/actors/DOMFullscreenChild.sys.mjs
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+++ b/browser/actors/DOMFullscreenChild.sys.mjs
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+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* 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/. */
+
+export class DOMFullscreenChild extends JSWindowActorChild {
+ receiveMessage(aMessage) {
+ let window = this.contentWindow;
+ let windowUtils = window?.windowUtils;
+
+ switch (aMessage.name) {
+ case "DOMFullscreen:Entered": {
+ if (!windowUtils) {
+ // If we are not able to enter fullscreen, tell the parent to just
+ // exit.
+ this.sendAsyncMessage("DOMFullscreen:Exit", {});
+ break;
+ }
+
+ let remoteFrameBC = aMessage.data.remoteFrameBC;
+ if (remoteFrameBC) {
+ let remoteFrame = remoteFrameBC.embedderElement;
+ if (!remoteFrame) {
+ // This could happen when the page navigate away and trigger a
+ // process switching during fullscreen transition, tell the parent
+ // to just exit.
+ this.sendAsyncMessage("DOMFullscreen:Exit", {});
+ break;
+ }
+ this._isNotTheRequestSource = true;
+ windowUtils.remoteFrameFullscreenChanged(remoteFrame);
+ } else {
+ this._waitForMozAfterPaint = true;
+ this._lastTransactionId = windowUtils.lastTransactionId;
+ if (
+ !windowUtils.handleFullscreenRequests() &&
+ !this.document.fullscreenElement
+ ) {
+ // If we don't actually have any pending fullscreen request
+ // to handle, neither we have been in fullscreen, tell the
+ // parent to just exit.
+ this.sendAsyncMessage("DOMFullscreen:Exit", {});
+ }
+ }
+ break;
+ }
+ case "DOMFullscreen:CleanUp": {
+ let isNotTheRequestSource = !!aMessage.data.remoteFrameBC;
+ // If we've exited fullscreen at this point, no need to record
+ // transaction id or call exit fullscreen. This is especially
+ // important for pre-e10s, since in that case, it is possible
+ // that no more paint would be triggered after this point.
+ if (this.document.fullscreenElement) {
+ this._isNotTheRequestSource = isNotTheRequestSource;
+ // Need to wait for the MozAfterPaint after exiting fullscreen if
+ // this is the request source.
+ this._waitForMozAfterPaint = !this._isNotTheRequestSource;
+ // windowUtils could be null if the associated window is not current
+ // active window. In this case, document must be in the process of
+ // exiting fullscreen, it is okay to not ask it to exit fullscreen.
+ if (windowUtils) {
+ this._lastTransactionId = windowUtils.lastTransactionId;
+ windowUtils.exitFullscreen();
+ }
+ } else if (isNotTheRequestSource) {
+ // If we are not the request source and have exited fullscreen, reply
+ // Exited to parent as parent is waiting for our reply.
+ this.sendAsyncMessage("DOMFullscreen:Exited", {});
+ } else {
+ // If we've already exited fullscreen, it is possible that no more
+ // paint would be triggered, so don't wait for MozAfterPaint.
+ // TODO: There might be some way to move this code around a bit to
+ // make it easier to follow. Somehow handle the "local" case in
+ // one place and the isNotTheRequestSource case after that.
+ this.sendAsyncMessage("DOMFullscreen:Painted", {});
+ }
+ break;
+ }
+ case "DOMFullscreen:Painted": {
+ Services.obs.notifyObservers(window, "fullscreen-painted");
+ break;
+ }
+ }
+ }
+
+ handleEvent(aEvent) {
+ if (this.hasBeenDestroyed()) {
+ // Make sure that this actor is alive before going further because
+ // if it's not the case, any attempt to send a message or access
+ // objects such as 'contentWindow' will fail. (See bug 1590138)
+ return;
+ }
+
+ switch (aEvent.type) {
+ case "MozDOMFullscreen:Request": {
+ this.sendAsyncMessage("DOMFullscreen:Request", {});
+ break;
+ }
+ case "MozDOMFullscreen:NewOrigin": {
+ this.sendAsyncMessage("DOMFullscreen:NewOrigin", {
+ originNoSuffix: aEvent.target.nodePrincipal.originNoSuffix,
+ });
+ break;
+ }
+ case "MozDOMFullscreen:Exit": {
+ this.sendAsyncMessage("DOMFullscreen:Exit", {});
+ break;
+ }
+ case "MozDOMFullscreen:Entered":
+ case "MozDOMFullscreen:Exited": {
+ if (this._isNotTheRequestSource) {
+ // Fullscreen change event for a frame in the
+ // middle (content frame embedding the oop frame where the
+ // request comes from)
+
+ delete this._isNotTheRequestSource;
+ this.sendAsyncMessage(aEvent.type.replace("Moz", ""), {});
+ break;
+ }
+
+ if (this._waitForMozAfterPaint) {
+ delete this._waitForMozAfterPaint;
+ this._listeningWindow = this.contentWindow.windowRoot;
+ this._listeningWindow.addEventListener("MozAfterPaint", this);
+ }
+
+ if (!this.document || !this.document.fullscreenElement) {
+ // If we receive any fullscreen change event, and find we are
+ // actually not in fullscreen, also ask the parent to exit to
+ // ensure that the parent always exits fullscreen when we do.
+ this.sendAsyncMessage("DOMFullscreen:Exit", {});
+ }
+ break;
+ }
+ case "MozAfterPaint": {
+ // Only send Painted signal after we actually finish painting
+ // the transition for the fullscreen change.
+ // Note that this._lastTransactionId is not set when in pre-e10s
+ // mode, so we need to check that explicitly.
+ if (
+ !this._lastTransactionId ||
+ aEvent.transactionId > this._lastTransactionId
+ ) {
+ this._listeningWindow.removeEventListener("MozAfterPaint", this);
+ delete this._listeningWindow;
+ this.sendAsyncMessage("DOMFullscreen:Painted", {});
+ }
+ break;
+ }
+ }
+ }
+
+ hasBeenDestroyed() {
+ // The 'didDestroy' callback is not always getting called.
+ // So we can't rely on it here. Instead, we will try to access
+ // the browsing context to judge wether the actor has
+ // been destroyed or not.
+ try {
+ return !this.browsingContext;
+ } catch {
+ return true;
+ }
+ }
+}