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Update useDynamicFontSizing.ts #7785

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Update useDynamicFontSizing.ts #7785

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19 changes: 8 additions & 11 deletions packages/ui/src/hooks/useDynamicFontSizing.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,24 +11,22 @@ export function useDynamicFontSizing(
onSetFontSize: (amount: string) => void
} {
const [fontSize, setFontSize] = useState(maxFontSize)
const textInputElementWidthRef = useRef(0)
const textInputElementWidthRef = useRef<number | null>(null)

const onLayout = useCallback((event: LayoutChangeEvent) => {
if (textInputElementWidthRef.current) {
return
}

const width = event.nativeEvent.layout.width
textInputElementWidthRef.current = width
if (textInputElementWidthRef.current !== width) {
textInputElementWidthRef.current = width
}
}, [])

const onSetFontSize = useCallback(
(amount: string) => {
if (!textInputElementWidthRef.current) return

const stringWidth = getStringWidth(amount, maxCharWidthAtMaxFontSize, fontSize, maxFontSize)
const scaledSize = fontSize * (textInputElementWidthRef.current / stringWidth)
// If scaledSize = 0 then onLayout hasn't triggered yet and we should default to the largest size
const scaledSizeWithMin = scaledSize ? Math.max(scaledSize, minFontSize) : maxFontSize
const newFontSize = Math.round(Math.min(maxFontSize, scaledSizeWithMin))
const newFontSize = Math.max(minFontSize, Math.min(maxFontSize, Math.round(scaledSize)))
setFontSize(newFontSize)
},
[fontSize, maxFontSize, minFontSize, maxCharWidthAtMaxFontSize],
Expand All @@ -43,6 +41,5 @@ const getStringWidth = (
currentFontSize: number,
maxFontSize: number,
): number => {
const widthAtMaxFontSize = value.length * maxCharWidthAtMaxFontSize
return widthAtMaxFontSize * (currentFontSize / maxFontSize)
return (value.length * maxCharWidthAtMaxFontSize * currentFontSize) / maxFontSize
}