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Don't scroll sync to elements inside collapsed details sections (#176541)
Fixes #176538 Turns out that `getClientBoundingRect` returns weird bounds for elements inside of a collapsed details section
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@ -8,10 +8,20 @@ import { SettingsManager } from './settings';
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const codeLineClass = 'code-line';
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export interface CodeLineElement {
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element: HTMLElement;
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line: number;
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codeElement?: HTMLElement;
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export class CodeLineElement {
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private readonly _detailParentElements: readonly HTMLDetailsElement[];
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constructor(
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readonly element: HTMLElement,
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readonly line: number,
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readonly codeElement?: HTMLElement,
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) {
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this._detailParentElements = Array.from(getParentsWithTagName<HTMLDetailsElement>(element, 'DETAILS'));
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}
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get isVisible(): boolean {
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return !this._detailParentElements.some(x => !x.open);
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}
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}
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const getCodeLineElements = (() => {
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@ -20,21 +30,26 @@ const getCodeLineElements = (() => {
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return (documentVersion: number) => {
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if (!cachedElements || documentVersion !== cachedVersion) {
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cachedVersion = documentVersion;
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cachedElements = [{ element: document.body, line: -1 }];
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cachedElements = [new CodeLineElement(document.body, -1)];
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for (const element of document.getElementsByClassName(codeLineClass)) {
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if (!(element instanceof HTMLElement)) {
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continue;
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}
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const line = +element.getAttribute('data-line')!;
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if (isNaN(line)) {
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continue;
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}
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if (element.tagName === 'CODE' && element.parentElement && element.parentElement.tagName === 'PRE') {
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// Fenced code blocks are a special case since the `code-line` can only be marked on
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// the `<code>` element and not the parent `<pre>` element.
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cachedElements.push({ element: element.parentElement as HTMLElement, line: line, codeElement: element as HTMLElement });
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cachedElements.push(new CodeLineElement(element.parentElement, line, element));
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} else if (element.tagName === 'UL' || element.tagName === 'OL') {
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// Skip adding list elements since the first child has the same code line (and should be preferred)
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} else {
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cachedElements.push({ element: element as HTMLElement, line });
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cachedElements.push(new CodeLineElement(element, line));
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}
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}
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}
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@ -67,7 +82,7 @@ export function getElementsForSourceLine(targetLine: number, documentVersion: nu
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* Find the html elements that are at a specific pixel offset on the page.
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*/
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export function getLineElementsAtPageOffset(offset: number, documentVersion: number): { previous: CodeLineElement; next?: CodeLineElement } {
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const lines = getCodeLineElements(documentVersion);
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const lines = getCodeLineElements(documentVersion).filter(x => x.isVisible);
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const position = offset - window.scrollY;
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let lo = -1;
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let hi = lines.length - 1;
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@ -145,9 +160,12 @@ export function scrollToRevealSourceLine(line: number, documentVersion: number,
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window.scroll(window.scrollX, Math.max(1, window.scrollY + scrollTo));
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}
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export function getEditorLineNumberForPageOffset(offset: number, documentVersion: number) {
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export function getEditorLineNumberForPageOffset(offset: number, documentVersion: number): number | null {
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const { previous, next } = getLineElementsAtPageOffset(offset, documentVersion);
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if (previous) {
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if (previous.line < 0) {
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return 0;
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}
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const previousBounds = getElementBounds(previous);
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const offsetFromPrevious = (offset - window.scrollY - previousBounds.top);
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if (next) {
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@ -169,3 +187,11 @@ export function getLineElementForFragment(fragment: string, documentVersion: num
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return element.element.id === fragment;
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});
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}
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function* getParentsWithTagName<T extends HTMLElement>(element: HTMLElement, tagName: string): Iterable<T> {
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for (let parent = element.parentElement; parent; parent = parent.parentElement) {
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if (parent.tagName === tagName) {
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yield parent as T;
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}
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}
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}
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