73e91b3b62
* Add getChildFrameElement to FrameAncestryHandler * Add isRootFrame * Initialize _frameOffset to [0, 0] * Update FrameOffsetForwarder implementation * Update documentation
71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
/*
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* Copyright (C) 2020-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
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* FrameAncestryHandler
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* api
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*/
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class FrameOffsetForwarder {
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constructor(frameId) {
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this._frameId = frameId;
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this._frameAncestryHandler = new FrameAncestryHandler(frameId);
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}
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prepare() {
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this._frameAncestryHandler.prepare();
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api.crossFrame.registerHandlers([
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['FrameOffsetForwarder.getChildFrameRect', {async: false, handler: this._onMessageGetChildFrameRect.bind(this)}]
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]);
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}
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async getOffset() {
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if (this._frameAncestryHandler.isRootFrame()) {
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return [0, 0];
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}
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const ancestorFrameIds = await this._frameAncestryHandler.getFrameAncestryInfo();
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let childFrameId = this._frameId;
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const promises = [];
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for (const frameId of ancestorFrameIds) {
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promises.push(api.crossFrame.invoke(frameId, 'FrameOffsetForwarder.getChildFrameRect', {frameId: childFrameId}));
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childFrameId = frameId;
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}
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const results = await Promise.all(promises);
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let xOffset = 0;
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let yOffset = 0;
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for (const {x, y} of results) {
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xOffset += x;
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yOffset += y;
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}
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return [xOffset, yOffset];
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}
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// Private
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_onMessageGetChildFrameRect({frameId}) {
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const frameElement = this._frameAncestryHandler.getChildFrameElement(frameId);
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if (frameElement === null) { return null; }
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const {x, y, width, height} = frameElement.getBoundingClientRect();
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return {x, y, width, height};
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}
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}
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