24 lines
794 B
TypeScript
24 lines
794 B
TypeScript
// Copyright 2021-2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export const getScrollBottom = (
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el: Readonly<Pick<HTMLElement, 'clientHeight' | 'scrollHeight' | 'scrollTop'>>
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): number => el.scrollHeight - el.scrollTop - el.clientHeight;
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export function setScrollBottom(
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el: Pick<HTMLElement, 'clientHeight' | 'scrollHeight' | 'scrollTop'>,
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newScrollBottom: number
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): void {
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// We want to mutate the parameter here.
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// eslint-disable-next-line no-param-reassign
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el.scrollTop = el.scrollHeight - newScrollBottom - el.clientHeight;
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}
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export function scrollToBottom(
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el: Pick<HTMLElement, 'scrollHeight' | 'scrollTop'>
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): void {
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// We want to mutate the parameter here.
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// eslint-disable-next-line no-param-reassign
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el.scrollTop = el.scrollHeight;
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}
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