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DocumentUtil extensibility (#2234)

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* Update DocumentUtil.getRangeFromPoint to be extensible

* Add documentation
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toasted-nutbread 2022-09-24 17:17:10 -04:00 committed by GitHub
parent 115c3ce3d7
commit da52caa152
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1 changed files with 44 additions and 1 deletions
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45
ext/js/dom/document-util.js
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@ -22,7 +22,40 @@
*/ */
class DocumentUtil { class DocumentUtil {
static getRangeFromPoint(x, y, {deepContentScan, normalizeCssZoom}) { /**
* Options to configure how element detection is performed.
* @typedef {object} GetRangeFromPointOptions
* @property {boolean} deepContentScan Whether or deep content scanning should be performed. When deep content scanning is enabled,
* some transparent overlay elements will be ignored when looking for the element at the input position.
* @property {boolean} normalizeCssZoom Whether or not zoom coordinates should be normalized.
*/
/**
* 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).
* @callback GetRangeFromPointHandler
* @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.
*/
/**
* 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, options) {
for (const handler of this._getRangeFromPointHandlers) {
const r = handler(x, y, options);
if (r !== null) { return r; }
}
const {deepContentScan, normalizeCssZoom} = options;
const elements = this._getElementsFromPoint(x, y, deepContentScan); const elements = this._getElementsFromPoint(x, y, deepContentScan);
let imposter = null; let imposter = null;
let imposterContainer = null; let imposterContainer = null;
@ -62,6 +95,14 @@ class DocumentUtil {
} }
} }
/**
* Registers a custom handler for scanning for text or elements at the input position.
* @param {GetRangeFromPointHandler} handler The handler callback which will be invoked when calling `getRangeFromPoint`.
*/
static registerGetRangeFromPointHandler(handler) {
this._getRangeFromPointHandlers.push(handler);
}
/** /**
* Extract a sentence from a document. * Extract a sentence from a document.
* @param {TextSourceRange|TextSourceElement} source The text source object, either `TextSourceRange` or `TextSourceElement`. * @param {TextSourceRange|TextSourceElement} source The text source object, either `TextSourceRange` or `TextSourceElement`.
@ -724,3 +765,5 @@ class DocumentUtil {
DocumentUtil._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/; DocumentUtil._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
// eslint-disable-next-line no-underscore-dangle // eslint-disable-next-line no-underscore-dangle
DocumentUtil._cssZoomSupported = null; DocumentUtil._cssZoomSupported = null;
// eslint-disable-next-line no-underscore-dangle
DocumentUtil._getRangeFromPointHandlers = [];