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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
*/
/**
* Parent actor for controlling the scrolling of a child page.
*/
export class MessageScrollParent extends JSWindowActorParent {
/**
* Scrolls the child window by a given number of pages.
*
* @param {number} pages - The number of pages that the
* child window should be scrolled by.
*/
scrollByPages(pages) {
this.sendAsyncMessage("scrollByPages", pages);
}
/**
* Gets the x and y scroll position and max scroll of the child window.
*
* @returns {Promise<?ScrollState>}
*/
async getSize() {
return this.sendQuery("getSize");
}
}