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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| export type Bounds = { | ||
| bottom: number; | ||
| left: number; | ||
| right: number; | ||
| top: number; | ||
| }; | ||
|
|
||
| const getParentElement = (element: Node): Element | null => | ||
| element.parentElement || (element.getRootNode() as ShadowRoot).host || null; | ||
|
|
||
| const getElementBounds = (element: Element): Bounds => { | ||
| const bounds = element.getBoundingClientRect(); | ||
| const scaleX = | ||
| ('offsetWidth' in element && | ||
| bounds.width / (element as HTMLElement).offsetWidth) || | ||
| 1; | ||
| const scaleY = | ||
| ('offsetHeight' in element && | ||
| bounds.height / (element as HTMLElement).offsetHeight) || | ||
| 1; | ||
| return { | ||
| top: bounds.top, | ||
| right: bounds.left + element.clientWidth * scaleX, | ||
| bottom: bounds.top + element.clientHeight * scaleY, | ||
| left: bounds.left, | ||
| }; | ||
| }; | ||
|
|
||
| const paddingValueToInt = (value: string) => { | ||
| const number = parseInt(value, 10); | ||
| return Number.isNaN(number) ? 0 : number; | ||
| }; | ||
|
|
||
| // Follow the steps described in https://www.w3.org/TR/cssom-view-1/#element-scrolling-members, | ||
| // assuming that the scroll option is set to 'nearest'. | ||
| const getScrollDistance = ( | ||
| targetStart: number, | ||
| targetEnd: number, | ||
| scrollStart: number, | ||
| scrollEnd: number, | ||
| scrollPaddingStart: number, | ||
| scrollPaddingEnd: number, | ||
| ) => { | ||
| if (targetStart < scrollStart && targetEnd > scrollEnd) { | ||
| return 0; | ||
| } | ||
|
|
||
| if (targetStart < scrollStart) { | ||
| return -(scrollStart - targetStart + scrollPaddingStart); | ||
| } | ||
|
|
||
| if (targetEnd > scrollEnd) { | ||
| return targetEnd - targetStart > scrollEnd - scrollStart | ||
| ? targetStart + scrollPaddingStart - scrollStart | ||
| : targetEnd - scrollEnd + scrollPaddingEnd; | ||
| } | ||
| return 0; | ||
| }; | ||
|
|
||
| const scrollBoundsIntoView = (root: HTMLElement, targetBounds: Bounds) => { | ||
| const document = root.ownerDocument; | ||
|
|
||
| let bounds = targetBounds; | ||
|
|
||
| let current: Element | null = root; | ||
| while (current) { | ||
| const isDocumentBody = current === document.body; | ||
| const bounding = isDocumentBody | ||
| ? { | ||
| top: 0, | ||
| right: | ||
| window.visualViewport?.width ?? | ||
| document.documentElement.clientWidth, | ||
| bottom: | ||
| window.visualViewport?.height ?? | ||
| document.documentElement.clientHeight, | ||
| left: 0, | ||
| } | ||
| : getElementBounds(current); | ||
|
|
||
| const style = getComputedStyle(current); | ||
| const scrollDistanceX = getScrollDistance( | ||
| bounds.left, | ||
| bounds.right, | ||
| bounding.left, | ||
| bounding.right, | ||
| paddingValueToInt(style.scrollPaddingLeft), | ||
| paddingValueToInt(style.scrollPaddingRight), | ||
| ); | ||
| const scrollDistanceY = getScrollDistance( | ||
| bounds.top, | ||
| bounds.bottom, | ||
| bounding.top, | ||
| bounding.bottom, | ||
| paddingValueToInt(style.scrollPaddingTop), | ||
| paddingValueToInt(style.scrollPaddingBottom), | ||
| ); | ||
| if (scrollDistanceX || scrollDistanceY) { | ||
| if (isDocumentBody) { | ||
| document.defaultView?.scrollBy(scrollDistanceX, scrollDistanceY); | ||
| } else { | ||
| const startX = current.scrollLeft, | ||
| startY = current.scrollTop; | ||
| if (scrollDistanceY) current.scrollTop += scrollDistanceY; | ||
| if (scrollDistanceX) current.scrollLeft += scrollDistanceX; | ||
| const scrolledX = current.scrollLeft - startX; | ||
| const scrolledY = current.scrollTop - startY; | ||
| bounds = { | ||
| left: bounds.left - scrolledX, | ||
| top: bounds.top - scrolledY, | ||
| right: bounds.right - scrolledX, | ||
| bottom: bounds.bottom - scrolledY, | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| current = | ||
| isDocumentBody || style.position === 'fixed' | ||
| ? null | ||
| : getParentElement(current); | ||
| } | ||
| }; | ||
|
|
||
| export default scrollBoundsIntoView; |
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