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33 lines
945 B
TypeScript
33 lines
945 B
TypeScript
export type BindElement = HTMLElement | Window | null | undefined;
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export function getTargetRect(target: BindElement): DOMRect {
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return target !== window
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? (target as HTMLElement).getBoundingClientRect()
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: ({ top: 0, bottom: window.innerHeight } as DOMRect);
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}
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export function getFixedTop(placeholderRect: DOMRect, targetRect: DOMRect, offsetTop?: number) {
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if (
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offsetTop !== undefined &&
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Math.round(targetRect.top) > Math.round(placeholderRect.top) - offsetTop
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) {
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return offsetTop + targetRect.top;
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}
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return undefined;
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}
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export function getFixedBottom(
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placeholderRect: DOMRect,
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targetRect: DOMRect,
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offsetBottom?: number,
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) {
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if (
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offsetBottom !== undefined &&
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Math.round(targetRect.bottom) < Math.round(placeholderRect.bottom) + offsetBottom
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) {
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const targetBottomOffset = window.innerHeight - targetRect.bottom;
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return offsetBottom + targetBottomOffset;
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}
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return undefined;
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}
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