57 lines
1.8 KiB
JavaScript
57 lines
1.8 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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import { ContentProcessDomain } from "chrome://remote/content/cdp/domains/ContentProcessDomain.sys.mjs";
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export class Input extends ContentProcessDomain {
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constructor(session) {
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super(session);
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// Internal id used to track existing event handlers.
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this._eventId = 0;
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// Map of event id -> event handler promise.
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this._eventPromises = new Map();
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}
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/**
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* Internal methods: the following methods are not part of CDP;
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* note the _ prefix.
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*/
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/**
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* Add an event listener in the content page for the provided eventName.
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* This method will return a unique handler id that can be used to wait
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* for the event.
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*
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* Example usage from a parent process domain:
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*
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* const id = await this.executeInChild("_addContentEventListener", "click");
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* // do something that triggers a click in content
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* await this.executeInChild("_waitForContentEvent", id);
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*/
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_addContentEventListener(eventName) {
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const eventPromise = new Promise(resolve => {
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this.chromeEventHandler.addEventListener(eventName, resolve, {
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mozSystemGroup: true,
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once: true,
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});
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});
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this._eventId++;
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this._eventPromises.set(this._eventId, eventPromise);
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return this._eventId;
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}
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/**
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* Wait for an event listener added via `addContentEventListener` to be fired.
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*/
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async _waitForContentEvent(eventId) {
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const eventPromise = this._eventPromises.get(eventId);
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if (!eventPromise) {
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throw new Error("No event promise found for id " + eventId);
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}
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await eventPromise;
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this._eventPromises.delete(eventId);
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}
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}
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