34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
import { useLayoutEffect } from '../../../../lib/teact/teact';
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import fastSmoothScroll from '../../../../util/fastSmoothScroll';
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import { FocusDirection } from '../../../../types';
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// This is the max scroll offset within existing viewport.
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const FOCUS_MAX_OFFSET = 1500;
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// This is used when the viewport was replaced.
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const RELOCATED_FOCUS_OFFSET = 1000;
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const FOCUS_MARGIN = 20;
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export default function useFocusMessage(
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elementRef: { current: HTMLDivElement | null },
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chatId: number,
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isFocused?: boolean,
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focusDirection?: FocusDirection,
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noFocusHighlight?: boolean,
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) {
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useLayoutEffect(() => {
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if (isFocused && elementRef.current) {
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const messagesContainer = elementRef.current.closest<HTMLDivElement>('.MessageList')!;
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fastSmoothScroll(
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messagesContainer,
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elementRef.current,
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// `noFocusHighlight` always called from “scroll-to-bottom” buttons
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noFocusHighlight ? 'end' : 'center',
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FOCUS_MARGIN,
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focusDirection === undefined ? FOCUS_MAX_OFFSET : RELOCATED_FOCUS_OFFSET,
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focusDirection,
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);
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}
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}, [elementRef, chatId, isFocused, focusDirection, noFocusHighlight]);
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}
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