зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.7 KiB
JavaScript
84 строки
2.7 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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"use strict";
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const { watcherSpec } = require("devtools/shared/specs/watcher");
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const {
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FrontClassWithSpec,
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registerFront,
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} = require("devtools/shared/protocol");
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loader.lazyRequireGetter(
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this,
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"BrowsingContextTargetFront",
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"devtools/client/fronts/targets/browsing-context",
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true
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);
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class WatcherFront extends FrontClassWithSpec(watcherSpec) {
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constructor(client, targetFront, parentFront) {
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super(client, targetFront, parentFront);
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this._onTargetAvailable = this._onTargetAvailable.bind(this);
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this._onTargetDestroyed = this._onTargetDestroyed.bind(this);
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// Convert form, which is just JSON object to Fronts for these two events
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this.on("target-available-form", this._onTargetAvailable);
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this.on("target-destroyed-form", this._onTargetDestroyed);
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}
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form(json) {
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this.actorID = json.actor;
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this.traits = json.traits;
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}
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_onTargetAvailable(form) {
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const front = new BrowsingContextTargetFront(this.conn, null, this);
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front.actorID = form.actor;
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front.form(form);
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this.manage(front);
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this.emit("target-available", front);
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}
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_onTargetDestroyed(form) {
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const front = this.actor(form.actor);
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this.emit("target-destroyed", front);
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}
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/**
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* Retrieve the already existing BrowsingContextTargetFront for the parent
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* BrowsingContext of the given BrowsingContext ID.
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*/
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async getParentBrowsingContextTarget(browsingContextID) {
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const id = await this.getParentBrowsingContextID(browsingContextID);
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if (!id) {
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return null;
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}
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return this.getBrowsingContextTarget(id);
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}
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/**
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* For a given BrowsingContext ID, return the already existing BrowsingContextTargetFront
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*/
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async getBrowsingContextTarget(id) {
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// First scan the watcher children as the watcher manages all the targets
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for (const front of this.poolChildren()) {
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if (front.browsingContextID == id) {
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return front;
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}
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}
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// But the top level target will be created by the Descriptor.getTarget() method
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// and so be hosted in the Descriptor's pool.
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// The parent front of the WatcherActor happens to be the Descriptor Actor.
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// This code could go away or be simplified if the Descriptor starts fetch all
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// the targets, including the top level one via the Watcher. i.e. drop Descriptor.getTarget().
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const topLevelTarget = await this.parentFront.getTarget();
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if (topLevelTarget.browsingContextID == id) {
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return topLevelTarget;
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}
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return null;
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}
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}
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registerFront(WatcherFront);
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