41 lines
1.6 KiB
TypeScript
41 lines
1.6 KiB
TypeScript
'use client'
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import { useViewer } from '@pascal-app/viewer'
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import { useCallback } from 'react'
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import { getLinearUnitLabel, linearUnitToMeters, metersToLinearUnit } from './measurements'
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/**
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* Shared display/storage conversion for numeric property controls so that
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* every length input honors the metric/imperial toggle identically.
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*
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* Values are always STORED in the field's own unit (meters for `unit === 'm'`).
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* When the viewer preference is imperial AND the field is a meter length, the
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* value is DISPLAYED (and edited) in feet; otherwise the conversions are the
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* identity, so metric fields and non-length units (`'°'`, `'%'`, `'in'`, `''`,
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* …) behave exactly as before.
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*
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* Used by both `SliderControl` and `MetricControl` — keep the two in sync via
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* this single source of truth.
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*/
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export function useLinearDisplay(unit: string, precision: number) {
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const viewerUnit = useViewer((state) => state.unit)
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const isImperial = viewerUnit === 'imperial' && unit === 'm'
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const displayUnit = isImperial ? getLinearUnitLabel('imperial') : unit
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const toDisplay = useCallback(
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(stored: number) => (isImperial ? metersToLinearUnit(stored, 'imperial') : stored),
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[isImperial],
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)
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const toStored = useCallback(
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(display: number) => (isImperial ? linearUnitToMeters(display, 'imperial') : display),
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[isImperial],
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)
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// Round a stored value so it lands on a clean number of DISPLAY-unit digits.
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const roundStored = useCallback(
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(stored: number) => toStored(Number.parseFloat(toDisplay(stored).toFixed(precision))),
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[toDisplay, toStored, precision],
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)
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return { isImperial, displayUnit, toDisplay, toStored, roundStored }
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}
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