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/* -*- mode: js; indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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
/**
* An object containing the scroll state of the window.
*
* @typedef {object} ScrollState
* @property {number} scrollX
* @property {number} scrollY
* @property {number} scrollMaxX
* @property {boolean} scrollMaxY
*/
/**
* Child actor for getting scroll information about a child window and scrolling
* the child window by a number of pages.
*/
export class MessageScrollChild extends JSWindowActorChild {
/**
* @param {object} args
* @param {"getSize"|"scrollByPages"} args.name
* @param {?number} args.data
* @param {?number} args.json
* @param {boolean} args.sync
* @param {object} args.target
* @returns {Promise<?ScrollState>}
*/
async receiveMessage(args) {
if (args.name === "getSize") {
return {
scrollX: this.contentWindow.scrollX,
scrollY: this.contentWindow.scrollY,
scrollMaxX: this.contentWindow.scrollMaxX,
scrollMaxY: this.contentWindow.scrollMaxY,
};
} else if (args.name === "scrollByPages") {
this.contentWindow.scrollByPages(args.data);
return null;
}
throw new Error("Unknown Message");
}
}