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Set longestLineRef once #233

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Merged
merged 1 commit into from
Jul 25, 2022
Merged

Set longestLineRef once #233

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51 changes: 27 additions & 24 deletions packages/mdx/src/smooth-code/use-dimensions.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -56,40 +56,43 @@ function useDimensions(
code.next,
focus.next
)

const lines = (code.prev || code.next!)
.trimEnd()
.split(newlineRe)

const lineCount = lines.length

// avod setting the ref more than once https://github.com/code-hike/codehike/issues/232
let prevLineRefSet = false
const element = (
<code className="ch-code-scroll-parent">
<br />
{lines.map((line, i) => (
<div
ref={
line === prevLongestLine
? prevLineRef
: undefined
}
key={i}
>
{lineNumbers ? (
<span className="ch-code-line-number">
_{lineCount}
</span>
) : undefined}
<div
style={{
display: "inline-block",
// leftPad
marginLeft: 16,
}}
>
<span>{line}</span>
{lines.map((line, i) => {
const ref =
!prevLineRefSet && line === prevLongestLine
? prevLineRef
: undefined
prevLineRefSet = prevLineRefSet || ref != null
return (
<div ref={ref} key={i}>
{lineNumbers ? (
<span className="ch-code-line-number">
_{lineCount}
</span>
) : undefined}
<div
style={{
display: "inline-block",
// leftPad
marginLeft: 16,
}}
>
<span>{line}</span>
</div>
</div>
</div>
))}
)
})}
<br />
</code>
)
Expand Down