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/*
* Copyright (C) 2023-2024 Yomitan Authors
* Copyright (C) 2020-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import {FrameAncestryHandler} from './frame-ancestry-handler.js';
export class FrameOffsetForwarder {
/**
* @param {import('../comm/cross-frame-api.js').CrossFrameAPI} crossFrameApi
*/
constructor(crossFrameApi) {
/** @type {import('../comm/cross-frame-api.js').CrossFrameAPI} */
this._crossFrameApi = crossFrameApi;
/** @type {FrameAncestryHandler} */
this._frameAncestryHandler = new FrameAncestryHandler(crossFrameApi);
}
/**
* @returns {void}
*/
prepare() {
this._frameAncestryHandler.prepare();
this._crossFrameApi.registerHandlers([
['frameOffsetForwarderGetChildFrameRect', this._onMessageGetChildFrameRect.bind(this)]
]);
}
/**
* @returns {Promise<?[x: number, y: number]>}
*/
async getOffset() {
if (this._frameAncestryHandler.isRootFrame()) {
return [0, 0];
}
const {frameId} = this._crossFrameApi;
if (frameId === null) { return null; }
try {
const ancestorFrameIds = await this._frameAncestryHandler.getFrameAncestryInfo();
let childFrameId = frameId;
/** @type {Promise<?import('frame-offset-forwarder').ChildFrameRect>[]} */
const promises = [];
for (const ancestorFrameId of ancestorFrameIds) {
promises.push(this._crossFrameApi.invoke(ancestorFrameId, 'frameOffsetForwarderGetChildFrameRect', {frameId: childFrameId}));
childFrameId = ancestorFrameId;
}
const results = await Promise.all(promises);
let x = 0;
let y = 0;
for (const result of results) {
if (result === null) { return null; }
x += result.x;
y += result.y;
}
return [x, y];
} catch (e) {
return null;
}
}
// Private
/** @type {import('cross-frame-api').ApiHandler<'frameOffsetForwarderGetChildFrameRect'>} */
_onMessageGetChildFrameRect({frameId}) {
const frameElement = this._frameAncestryHandler.getChildFrameElement(frameId);
if (frameElement === null) { return null; }
const {left, top, width, height} = frameElement.getBoundingClientRect();
return {x: left, y: top, width, height};
}
}
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