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Google Docs accessibility update (#2235)
* Update Google Docs injection script * Create GoogleDocsUtil * Update Frontend.js to register GoogleDocsUtil's getRangeFromPoint handler * Update setting name and description * Add comment * Fix Firefox support
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| /* | ||
| * Copyright (C) 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/>. | ||
| */ | ||
|
|
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| /* global | ||
| * DocumentUtil | ||
| * TextSourceRange | ||
| */ | ||
|
|
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| /** | ||
| * This class is a helper for handling Google Docs content in content scripts. | ||
| */ | ||
| class GoogleDocsUtil { | ||
| /** | ||
| * Scans the document for text or elements with text information at the given coordinate. | ||
| * Coordinates are provided in [client space](https://developer.mozilla.org/en-US/docs/Web/CSS/CSSOM_View/Coordinate_systems). | ||
| * @param {number} x The x coordinate to search at. | ||
| * @param {number} y The y coordinate to search at. | ||
| * @param {GetRangeFromPointOptions} options Options to configure how element detection is performed. | ||
| * @returns {?TextSourceRange|TextSourceElement} A range for the hovered text or element, or `null` if no applicable content was found. | ||
| */ | ||
| static getRangeFromPoint(x, y, {normalizeCssZoom}) { | ||
| const selector = '.kix-canvas-tile-content svg>g>rect'; | ||
| const styleNode = this._getStyleNode(selector); | ||
| styleNode.disabled = false; | ||
| const elements = document.elementsFromPoint(x, y); | ||
| styleNode.disabled = true; | ||
| for (const element of elements) { | ||
| if (!element.matches(selector)) { continue; } | ||
| const ariaLabel = element.getAttribute('aria-label'); | ||
| if (typeof ariaLabel !== 'string' || ariaLabel.length === 0) { continue; } | ||
| return this._createRange(element, ariaLabel, x, y, normalizeCssZoom); | ||
| } | ||
| return null; | ||
| } | ||
|
|
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| static _getStyleNode(selector) { | ||
| // This <style> node is necessary to force the SVG <rect> elements to have a fill, | ||
| // which allows them to be included in document.elementsFromPoint's return value. | ||
| if (this._styleNode === null) { | ||
| const style = document.createElement('style'); | ||
| style.textContent = `${selector}{fill:#0000 !important;}`; | ||
| const parent = document.head || document.documentElement; | ||
| if (parent !== null) { | ||
| parent.appendChild(style); | ||
| } | ||
| this._styleNode = style; | ||
| } | ||
| return this._styleNode; | ||
| } | ||
|
|
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| static _createRange(element, text, x, y, normalizeCssZoom) { | ||
| // Create imposter | ||
| const content = document.createTextNode(text); | ||
| const svgText = document.createElementNS('http://www.w3.org/2000/svg', 'text'); | ||
| const transform = element.getAttribute('transform') || ''; | ||
| svgText.setAttribute('x', element.getAttribute('x')); | ||
| svgText.setAttribute('y', element.getAttribute('y')); | ||
| svgText.appendChild(content); | ||
| const textStyle = svgText.style; | ||
| this._setImportantStyle(textStyle, 'all', 'initial'); | ||
| this._setImportantStyle(textStyle, 'transform', transform); | ||
| this._setImportantStyle(textStyle, 'font', element.dataset.fontCss); | ||
| this._setImportantStyle(textStyle, 'text-anchor', 'start'); | ||
| element.parentNode.appendChild(svgText); | ||
|
|
||
| // Adjust offset | ||
| const elementRect = element.getBoundingClientRect(); | ||
| const textRect = svgText.getBoundingClientRect(); | ||
| const yOffset = ((elementRect.top - textRect.top) + (elementRect.bottom - textRect.bottom)) * 0.5; | ||
| this._setImportantStyle(textStyle, 'transform', `translate(0px,${yOffset}px) ${transform}`); | ||
|
|
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| // Create range | ||
| const range = this._getRangeWithPoint(content, x, y, normalizeCssZoom); | ||
| this._setImportantStyle(textStyle, 'pointer-events', 'none'); | ||
| this._setImportantStyle(textStyle, 'opacity', '0'); | ||
| return new TextSourceRange(range, '', svgText, element); | ||
| } | ||
|
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| static _getRangeWithPoint(textNode, x, y, normalizeCssZoom) { | ||
| if (normalizeCssZoom) { | ||
| const scale = DocumentUtil.computeZoomScale(textNode); | ||
| x /= scale; | ||
| y /= scale; | ||
| } | ||
| const range = document.createRange(); | ||
| let start = 0; | ||
| let end = textNode.nodeValue.length; | ||
| while (end - start > 1) { | ||
| const mid = Math.floor((start + end) / 2); | ||
| range.setStart(textNode, mid); | ||
| range.setEnd(textNode, end); | ||
| if (DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) { | ||
| start = mid; | ||
| } else { | ||
| end = mid; | ||
| } | ||
| } | ||
| range.setStart(textNode, start); | ||
| range.setEnd(textNode, end); | ||
| return range; | ||
| } | ||
|
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| static _setImportantStyle(style, propertyName, value) { | ||
| style.setProperty(propertyName, value, 'important'); | ||
| } | ||
| } | ||
| // eslint-disable-next-line no-underscore-dangle | ||
| GoogleDocsUtil._styleNode = null; |
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