46 lines
1.4 KiB
TypeScript
46 lines
1.4 KiB
TypeScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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const VERTICAL_GAP = 10;
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const HORIZONTAL_OFFSET = 5;
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export const setFloatingElemPosition = (
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targetRect: ClientRect | null,
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floatingElem: HTMLElement,
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anchorElem: HTMLElement,
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verticalGap: number = VERTICAL_GAP,
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horizontalOffset: number = HORIZONTAL_OFFSET,
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): void => {
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const scrollerElem = anchorElem.parentElement;
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if (targetRect === null || !scrollerElem) {
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floatingElem.style.opacity = '0';
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floatingElem.style.transform = 'translate(-10000px, -10000px)';
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return;
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}
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const floatingElemRect = floatingElem.getBoundingClientRect();
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const anchorElementRect = anchorElem.getBoundingClientRect();
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const editorScrollerRect = scrollerElem.getBoundingClientRect();
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let top = targetRect.top - floatingElemRect.height - verticalGap;
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let left = targetRect.left - horizontalOffset;
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if (top < editorScrollerRect.top) {
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top += floatingElemRect.height + targetRect.height + verticalGap * 2;
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}
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if (left + floatingElemRect.width > editorScrollerRect.right) {
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left = editorScrollerRect.right - floatingElemRect.width - horizontalOffset;
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}
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top -= anchorElementRect.top;
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left -= anchorElementRect.left;
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floatingElem.style.opacity = '1';
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floatingElem.style.transform = `translate(${left}px, ${top}px)`;
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};
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