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Replace react svg text
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| import memoize from "lodash/memoize" | ||
| import PropTypes from "prop-types" | ||
| import React, { useEffect, useState } from "react" | ||
| import reduceCSSCalc from "reduce-css-calc" | ||
|
|
||
| const MEASUREMENT_ELEMENT_ID = "svg-text-measurement-id" | ||
|
|
||
| const SvgText = ({ | ||
| x, | ||
| y, | ||
| dx, | ||
| dy, | ||
| width, | ||
| lineHeight, | ||
| capHeight, | ||
| verticalAnchor, | ||
| textAnchor, | ||
| style, | ||
| children, | ||
| ...textProps | ||
| }) => { | ||
| const [wordsByLines, setWordsByLines] = useState([]) | ||
| useEffect(() => { | ||
| const calculatedWidths = calculateWordWidths(children, style) | ||
| setWordsByLines( | ||
| calculateWordByLines( | ||
| calculatedWidths.wordsWithComputedWidth, | ||
| calculatedWidths.spaceWidth, | ||
| width | ||
| ) | ||
| ) | ||
| }, [children, style, width]) | ||
| return ( | ||
| <text | ||
| x={x + dx} | ||
| y={y + dy} | ||
| textAnchor={textAnchor} | ||
| style={style} | ||
| {...textProps} | ||
| > | ||
| {wordsByLines.map((line, index) => ( | ||
| <tspan | ||
| x={x + dx} | ||
| dy={ | ||
| index === 0 | ||
| ? getStartDy(verticalAnchor, capHeight, wordsByLines, lineHeight) | ||
| : lineHeight | ||
| } | ||
| key={index} | ||
| > | ||
| {line.words.join(" ")} | ||
| </tspan> | ||
| ))} | ||
| </text> | ||
| ) | ||
| } | ||
|
|
||
| SvgText.propTypes = { | ||
| x: PropTypes.number, | ||
| y: PropTypes.number, | ||
| dx: PropTypes.number, | ||
| dy: PropTypes.number, | ||
| width: PropTypes.number, | ||
| lineHeight: PropTypes.string, | ||
| capHeight: PropTypes.string, | ||
| verticalAnchor: PropTypes.oneOf(["start", "middle", "end"]), | ||
| textAnchor: PropTypes.oneOf(["start", "middle", "end", "inherit"]), | ||
| style: PropTypes.object, | ||
| children: PropTypes.node | ||
| } | ||
|
|
||
| SvgText.defaultProps = { | ||
| x: 0, | ||
| y: 0, | ||
| dx: 0, | ||
| dy: 0, | ||
| lineHeight: "1em", | ||
| capHeight: "0.71em", // Magic number from d3 | ||
| textAnchor: "start", | ||
| verticalAnchor: "end" | ||
| } | ||
|
|
||
| const getStartDy = (verticalAnchor, capHeight, wordsByLines, lineHeight) => { | ||
| switch (verticalAnchor) { | ||
| case "start": | ||
| return reduceCSSCalc(`calc(${capHeight})`) | ||
| case "middle": | ||
| return reduceCSSCalc( | ||
| `calc(${ | ||
| (wordsByLines.length - 1) / 2 | ||
| } * -${lineHeight} + (${capHeight} / 2))` | ||
| ) | ||
| default: | ||
| return reduceCSSCalc(`calc(${wordsByLines.length - 1} * -${lineHeight})`) | ||
| } | ||
| } | ||
|
|
||
| const calculateWordByLines = ( | ||
| wordsWithComputedWidth, | ||
| spaceWidth, | ||
| lineWidth | ||
| ) => { | ||
| return wordsWithComputedWidth.reduce((wordsByLines, { word, width }) => { | ||
| const currentLine = wordsByLines[wordsByLines.length - 1] | ||
| if ( | ||
| currentLine && | ||
| (lineWidth === null || currentLine.width + width < lineWidth) | ||
| ) { | ||
| currentLine.words.push(word) | ||
| currentLine.width += width + spaceWidth | ||
| } else { | ||
| const newLine = { words: [word], width } | ||
| wordsByLines.push(newLine) | ||
| } | ||
| return wordsByLines | ||
| }, []) | ||
| } | ||
|
|
||
| const calculateWordWidths = (children, style) => { | ||
| const words = children ? children.toString().split(/\s+/) : [] | ||
| const wordsWithComputedWidth = words.map(word => ({ | ||
| word, | ||
| width: getStringWidthMemoized(word, style) | ||
| })) | ||
| const spaceWidth = getStringWidthMemoized("\u00A0", style) | ||
| return { wordsWithComputedWidth, spaceWidth } | ||
| } | ||
|
|
||
| const getStringWidth = (str, style) => { | ||
| let textEl = document.getElementById(MEASUREMENT_ELEMENT_ID) | ||
| if (!textEl) { | ||
| const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg") | ||
| textEl = document.createElementNS("http://www.w3.org/2000/svg", "text") | ||
| textEl.setAttribute("id", MEASUREMENT_ELEMENT_ID) | ||
| svg.appendChild(textEl) | ||
| document.body.appendChild(svg) | ||
| } | ||
| Object.assign(textEl.style, style) | ||
| textEl.textContent = str | ||
| return textEl.getComputedTextLength() | ||
| } | ||
|
|
||
| const getStringWidthMemoized = memoize(getStringWidth) | ||
|
|
||
| export default SvgText |
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