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13 | import {FocusableElement} from '@react-types/shared';
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25 | interface ScrollableElement {
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26 | element: HTMLElement,
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27 | scrollTop: number,
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28 | scrollLeft: number
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29 | }
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30 |
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31 | export function focusWithoutScrolling(element: FocusableElement) {
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32 | if (supportsPreventScroll()) {
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33 | element.focus({preventScroll: true});
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34 | } else {
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35 | let scrollableElements = getScrollableElements(element);
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36 | element.focus();
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37 | restoreScrollPosition(scrollableElements);
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38 | }
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39 | }
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40 |
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41 | let supportsPreventScrollCached: boolean | null = null;
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42 | function supportsPreventScroll() {
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43 | if (supportsPreventScrollCached == null) {
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44 | supportsPreventScrollCached = false;
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45 | try {
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46 | let focusElem = document.createElement('div');
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47 | focusElem.focus({
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48 | get preventScroll() {
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49 | supportsPreventScrollCached = true;
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50 | return true;
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51 | }
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52 | });
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53 | } catch (e) {
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54 |
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55 | }
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56 | }
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57 |
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58 | return supportsPreventScrollCached;
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59 | }
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60 |
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61 | function getScrollableElements(element: FocusableElement): ScrollableElement[] {
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62 | let parent = element.parentNode;
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63 | let scrollableElements: ScrollableElement[] = [];
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64 | let rootScrollingElement = document.scrollingElement || document.documentElement;
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65 |
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66 | while (parent instanceof HTMLElement && parent !== rootScrollingElement) {
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67 | if (
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68 | parent.offsetHeight < parent.scrollHeight ||
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69 | parent.offsetWidth < parent.scrollWidth
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70 | ) {
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71 | scrollableElements.push({
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72 | element: parent,
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73 | scrollTop: parent.scrollTop,
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74 | scrollLeft: parent.scrollLeft
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75 | });
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76 | }
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77 | parent = parent.parentNode;
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78 | }
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79 |
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80 | if (rootScrollingElement instanceof HTMLElement) {
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81 | scrollableElements.push({
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82 | element: rootScrollingElement,
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83 | scrollTop: rootScrollingElement.scrollTop,
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84 | scrollLeft: rootScrollingElement.scrollLeft
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85 | });
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86 | }
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87 |
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88 | return scrollableElements;
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89 | }
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90 |
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91 | function restoreScrollPosition(scrollableElements: ScrollableElement[]) {
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92 | for (let {element, scrollTop, scrollLeft} of scrollableElements) {
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93 | element.scrollTop = scrollTop;
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94 | element.scrollLeft = scrollLeft;
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95 | }
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96 | }
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