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import React, { useEffect, useMemo, useState } from 'react';
/**
* Represents the result of truncating the string list
* text: the text to display before the '...# more' link
* numberMore: the number to display in the '...# more' link
* has two special values
* 0: the full text can be displayed; do not show '...# more'
* -1: the list is of length one but the element cannot be fully
* displayed. show '...more' without a '#'
*/
interface TextDisplay {
text: string;
numberMore: number;
}
/**
* Compute TextDisplay for a list of strings
* @param strings list of strings to process
* @param maxLength max displayable length
*/
function computeFromStringList(strings: string[], maxLength: number, listSeparator: string): TextDisplay {
if (strings.length === 0) {
return { text: '', numberMore: 0 };
}
if (strings[0].length > maxLength) {
// case in which the first string is too long to fit by itself
return {
text: strings[0].substring(0, maxLength),
numberMore: strings.length === 1 ? -1 : strings.length - 1,
};
}
// concatenate strings with ', ' and stop before exceeding max
let stringsRemaining = strings.length - 1;
let result = strings[0];
for (let i = 1; i < strings.length; i++) {
const tempResult = [result, strings[i]].join(listSeparator);
if (tempResult.length > maxLength) {
break;
}
stringsRemaining--;
result = tempResult;
}
return {
text: result,
numberMore: stringsRemaining,
};
}
export interface Props {
stringList: string[];
maxLengthPx: number;
moreSeparator: string;
moreText?: string;
listSeparator: string;
textStyle?: Record<string, any>;
showAllStyle?: Record<string, any>;
placeHolder?: React.ReactElement;
}
export default function TextTruncated(props: Props): JSX.Element | null {
const { stringList, listSeparator, maxLengthPx, moreSeparator, moreText, textStyle, showAllStyle, placeHolder } =
props;
const [showAllOpen, setShowAllOpen] = useState(false);
const [canvasContext, setCanvasContext] = useState<CanvasRenderingContext2D>();
const theme = useTheme();
useEffect(() => {
const canvas = document.createElement('canvas');
setCanvasContext(canvas?.getContext('2d') ?? undefined);
}, []);
const pixelsPerChar = useMemo(() => {
// compute the pixels per character, averaged over the comma-separated joined stringList
const fullText = stringList.join(listSeparator);
let result = 0;
if (canvasContext) {
const fontSize = (textStyle && textStyle.fontSize) || theme.typography.fontSize;
const fontFamily = (textStyle && textStyle.fontFamily) || theme.typography.fontFamily;
canvasContext.font = `${fontSize}px ${fontFamily}`;
result = canvasContext.measureText(fullText).width;
}
return result / fullText.length;
}, [stringList, textStyle, canvasContext, theme.typography.fontFamily, theme.typography.fontSize]);
let maxExcludingSuffix = stringList.join(listSeparator).length;
if (pixelsPerChar > 0) {
const maxChars = maxLengthPx / pixelsPerChar;
maxExcludingSuffix =
maxChars - moreSeparator.length - (moreText ? moreText.length : 0 ) - 1 - Math.ceil(Math.log10(stringList.length));
}
const textToDisplay = computeFromStringList(stringList, maxExcludingSuffix, listSeparator);
const onClickHandler = (e: React.MouseEvent) => {
e.stopPropagation();
setShowAllOpen(!showAllOpen);
};
return stringList.length > 0 ? (
<Typography sx={textStyle}>
{textToDisplay.text}
{(textToDisplay.numberMore !== 0 && moreText ) ? moreSeparator : ''}
{textToDisplay.numberMore !== 0 ? (
<Tooltip
arrow={true}
open={moreText ? showAllOpen : undefined}
enterDelay={moreText ? 0 : 400}
title={
<Typography sx={showAllStyle} fontSize='14px'>
{stringList.join(listSeparator)}
</Typography>
}
sx={{
'& .MuiTooltip-arrow': {
color: `${theme.palette.TwClrBg} !important`,
'&:before': {
border: `1px solid ${theme.palette.TwClrBrdrTertiary}`,
},
},
'& .MuiTooltip-popper': {
maxHeight: '200px',
overflow: 'auto',
},
'& .MuiTooltip-tooltip': {
backgroundColor: `${theme.palette.TwClrBg} !important`,
color: `${theme.palette.TwClrTxt} !important`,
border: `1px solid ${theme.palette.TwClrBrdrTertiary} !important`,
borderRadius: '8px !important',
boxShadow: `0px 3px 3px ${theme.palette.TwClrBaseGray100}`,
padding: '8px',
},
}}
>
{moreText ? (
<Link
component='button'
onClick={onClickHandler}
onBlur={() => setShowAllOpen(false)}
sx={{ color: theme.palette.TwClrTxtBrand, textDecorationColor: `${theme.palette.TwClrTxtBrand}80` }}
>
<Typography sx={{ ...textStyle, marginTop: '-3px' }}>
{(textToDisplay.numberMore > 0 ? textToDisplay.numberMore + ' ' : '') + moreText}
</Typography>
</Link>
) : (
<Typography sx={{ ...textStyle, display: 'inline' }}>
{moreSeparator}
</Typography>
)}
</Tooltip>
) : null}
</Typography>
) : (
placeHolder || null
);
}
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