signal-desktop/ts/components/conversation/MessageBodyReadMore.tsx

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// Copyright 2021-2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
import React from 'react';
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import type { Props as MessageBodyPropsType } from './MessageBody';
import { MessageBody } from './MessageBody';
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import { graphemeAwareSlice } from '../../util/graphemeAwareSlice';
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export type Props = Pick<
MessageBodyPropsType,
| 'direction'
| 'text'
| 'textAttachment'
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| 'disableLinks'
| 'i18n'
| 'bodyRanges'
| 'openConversation'
| 'kickOffBodyDownload'
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> & {
id: string;
displayLimit?: number;
messageExpanded: (id: string, displayLimit: number) => unknown;
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};
const INITIAL_LENGTH = 800;
const INCREMENT_COUNT = 3000;
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const BUFFER = 100;
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export function doesMessageBodyOverflow(str: string): boolean {
return str.length > INITIAL_LENGTH + BUFFER;
}
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export function MessageBodyReadMore({
bodyRanges,
direction,
disableLinks,
displayLimit,
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i18n,
id,
messageExpanded,
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openConversation,
kickOffBodyDownload,
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text,
textAttachment,
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}: Props): JSX.Element {
const maxLength = displayLimit || INITIAL_LENGTH;
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const { hasReadMore, text: slicedText } = graphemeAwareSlice(
text,
maxLength,
BUFFER
);
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const onIncreaseTextLength = hasReadMore
? () => {
messageExpanded(id, maxLength + INCREMENT_COUNT);
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}
: undefined;
return (
<MessageBody
bodyRanges={bodyRanges}
disableLinks={disableLinks}
direction={direction}
i18n={i18n}
onIncreaseTextLength={onIncreaseTextLength}
openConversation={openConversation}
kickOffBodyDownload={kickOffBodyDownload}
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text={slicedText}
textAttachment={textAttachment}
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/>
);
}