Hiroyuki Ikezoe
f66e509a3e
AutoScrollChild sent its own BrowsingContext to AutoScrollParent as part of the "Autoscroll:Start" message, but a JSWindowActorParent and its paired JSWindowActorChild always share the same BrowsingContext, so AutoScrollParent can just use its own `this.browsingContext` instead. Differential Revision: https://phabricator.services.mozilla.com/D315468
54 lines
2.0 KiB
JavaScript
54 lines
2.0 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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export class AutoScrollParent extends JSWindowActorParent {
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receiveMessage(msg) {
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let browser = this.manager.browsingContext.top.embedderElement;
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if (!browser) {
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return null;
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}
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// If another tab is activated, we shouldn't start autoscroll requested
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// for the previous active window if and only if the browser is a remote
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// browser. This is required for web apps which don't prevent default of
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// middle click after opening a new window. If the active tab is our
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// documents like about:*, we don't need this check since our documents
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// should do it correctly.
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const requestedInForegroundTab = browser.isRemoteBrowser
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? Services.focus.focusedElement == browser
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: true;
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let data = msg.data;
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switch (msg.name) {
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case "Autoscroll:Start":
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// Don't start autoscroll if the tab has already been a background tab.
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if (!requestedInForegroundTab) {
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return Promise.resolve({ autoscrollEnabled: false, usingAPZ: false });
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}
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return Promise.resolve(
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browser.startScroll({
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...data,
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browsingContext: this.browsingContext,
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})
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);
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case "Autoscroll:MaybeStartInParent": {
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// Don't start autoscroll if the tab has already been a background tab.
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if (!requestedInForegroundTab) {
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return Promise.resolve({ autoscrollEnabled: false, usingAPZ: false });
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}
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let parent = this.browsingContext.parent;
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if (parent) {
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let actor = parent.currentWindowGlobal.getActor("AutoScroll");
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actor.sendAsyncMessage("Autoscroll:MaybeStart", data);
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}
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break;
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}
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case "Autoscroll:Cancel":
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browser.cancelScroll();
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break;
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}
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return null;
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}
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}
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